1691results about How to "Guaranteed compactness" patented technology

A storage mamagement method of embedded database,includes that: (1) the storage strategy of data in the memory is that: if logic structure accords with physical structure, the structure is into a divided system area, a main storage database area, a user working area, a log area and a preformed area; the storage strategy of data in the external memory is that: logic structure is divided into a database table, a segment and a database block; physical structure includes a physical file and a physical block; (2) the physical file organization of database is that: a data dictionary is placed at the heading, a user table since then; (3) the memory management of data dictionaryin the external memory is that: the described information of physical file is stored in the file header, denotative definition kind and attribute definition kind adopt a three section type storage form; data dictionary adopt a page type memory management method in the memory; (4) a permanent memory data is stored using T tree and a a permanent external memory data is stored using B+ tree; data and its index are managed using a extended segment memory management method. The invention improves the utilization rate of memory space, and accelerate the speed of data to access.

A vehicle comprises a transaxle, a battery and a load carrying bed. The transaxle includes a casing incorporating a drive train and supporting an axle and includes an electric motor mounted on the casing to drive the axle via the drive train. The battery is provided for supplying electric power to the electric motor. The transaxle and the battery are disposed below the load carrying bed so as to overlap the load carrying bed when viewed in plan.

The invention discloses a halogen-free cleaning-free rosin flux, and preparation and application thereof, and particularly relates to a flux suitable for surface mount lead-free welding paste, preparation of the flux and application of the flux. The flux comprises 20-50% (mass fraction, the same below) of rosin, 5-25% of film-forming agent, 30-50% of high boiling solvent, 3-8% of activator and 2-5% of thixotropic agent, and the flux does not contain any halogen. In order to control growth of interface IMC (intermediate compound) during welding, 0.3-1% of combined inhibitor is added. The welding paste prepared with the flux and lead-free tin-silver-copper powder has the advantages of excellent printing performance, fine weldability, less post-weld residue, thin and even welding spot interface IMC and excellent mechanical property, and is capable of meeting the requirement of high-end electronic products on packaging.

The invention discloses a laser scanning method for laser melting in a selected area. The laser scanning method comprises the following steps: dividing a workpiece area into a plurality of latticed regular triangles with side length being 1mm-10mm and a plurality of irregular figures at borders according to the cross section information of a workpiece, taking a gap G between the adjacent figures from -1mm to 1mm; scanning the irregular figures at the borders as the zoning regular triangles and adopting an equidistant scanning line for successively finishing the zoning figure scanning; according to the zoning direction, adopting the equidistant scanning line for successively finishing the gap scanning; scanning along a practical outline of the workpiece or the outline deviating within 1mm inward or outward to the practical outline of the workpiece according to the requirement, or repeatedly scanning along a plurality of outlines deviating from the practical outline of the workpiece within 1mm, thereby finishing the cross section canning for the workpiece. According to the scanning method provided by the invention, the scattering effect of residual stress in the workpiece during a laser scanning process is improved, the laser scanning direction during the scanning process does not need to be repeatedly changed, the scanning efficiency is high, the technique control is simple, and the compactness and the precision of the workpiece are ensured.

The invention belongs to the technical field of nano-materials and chemical power sources and particularly provides a nano-Si or nano-Sn containing composite cathode material for a lithium ion battery and a preparation method thereof. The composite cathode material of the invention comprises the following components: cathode active substances, nano-Si or nano-Sn, and macromolecule polymers. The method taking the above components as raw materials comprises the following steps: firstly, preparing mixed solution; then, removing organic solvent; further coating the mixed solution with the macromolecule polymers; then, removing organic solvent; and finally, carrying out carbonization treatment to obtain the finished product. The invention has the advantages of fewer components, low cost, simple process and low energy consumption; and the composite cathode material prepared by the method of the invention has a core-shell structure and has the characteristics of high capacity, high stability and high capability of rapidly charging and discharging. Therefore, the composite cathode material of the invention is widely applicable to lithium ion batteries, super-capacitors and other components based on new energy resources and particularly applicable to lithium ion batteries for electric vehicles.

The invention discloses a dispersive modulation-based non-mirror image optimal frequency domain imaging system and a dispersive modulation-based non-mirror image optimal frequency domain imaging method. In the system, a transmission-type optimal scanning delay line is arranged in a reference arm for modulating dispersion so as to ensure the identity of the axial positions of a sample under different dispersion states; by changing a rotation angle of an oscillating mirror in the transmission optimal scanning delay line, the rapid modulation of dispersion is realized, and two group of interference spectrum signals of the same sample are acquired under two different dispersion states; the two group of acquired interference spectrum signals are respectively multiplied by corresponding dispersion compensation factors so as to accurately compensate the dispersion of imaginary part subjected to corresponding Fourier transform; subtraction operation is performed on the two group of interference spectrum signals subjected to dispersion compensation, then, the imaginary part of the corresponding repeated reflection signal disappears, and the real part still contains the dispersion factor; and finally, the interference spectrum signals subjected to subtraction are subjected to dispersive compensation again and then subjected to Fourier inverse transformation so as to obtain the actual reflection signal of the sample for non-mirror image reconstruction of the sample image.

The invention provides a spinning process of covering yarn with high hollowness degree, a prepared covering yarn and a process for weaving towel by utilizing the covering yarn. The spinning process comprises the following steps of: compositing and twisting two crude cotton yarns and water-soluble vinylon filament with number of 4.1-7.3 tex to prepare a spun yarn with cotton fiber covering the water-soluble vinylon filament; and hydrolyzing the water-soluble vinylon filament to obtain the covering yarn with the high hollowness degree. The strength and the hollowness degree of the covering yarn with the high hollowness degree, prepared by the spinning process disclosed by the invention, are higher than the strength and the hollowness degree of a common hollow covering yarn with the same yarn count, the overing yarn with the high hollowness degree is soft and fluffy and has strong water absorbability and improved heat insulation performance; and the woven towel prepared by the process of the invention is light and fluffy, and has good heat insulation performance and resilience, high water absorption speed, large unit-area water absorption amount and high drying speed.

A power transmission apparatus for a working vehicle according to the present invention comprises: substantially symmetrically disposed first and second transaxles each of which includes an input shaft and a housing supporting a single axle; and a working apparatus driving power take-off device including an input member. A gear casing is spanned between the housings of the respective transaxles. A primary drive shaft is disposed in the gear casing so as to be drivingly connected to a prime mover. A traveling drive train is disposed in the gear casing so as to drivingly connect the primary drive shaft to the input shafts of the respective transaxles. A working apparatus drive train is disposed in the gear casing so as to drivingly connect the primary drive shaft to the input member of the working apparatus driving power take-off device.

Provided is an intelligent tunnel lining trolley, characterized by comprising a door-shaped main steel frame, a concrete pouring informationized monitoring system, an end template, a template cleaningand surface lubricating system, an automatic running gear, and a layered window-by-window pouring and cleaning system. The tunnel lining trolley is simple in structure and reasonable in design, and real-time monitoring of each parameter in a concrete pouring process is realized, automation degree of equipment is improved, cleaning and template surface lubrication operation flow are simplified. The intelligent tunnel lining trolley provides convenience for on-site management and construction, and has certain environmental protection property and very high security.

The invention discloses a tunnel underground excavation and lining constriction trolley and a tunnel underground excavation and lining construction method. The tunnel underground excavation and lining trolley comprises a trolley support system and a trolley formwork system; the trolley support system comprises a support system frame, a vertical hydraulic device, an upper vertical pole, a horizontal hydraulic device and a horizontal pole; the trolley formwork system comprises a formwork system frame, a jacking hydraulic oil cylinder, a longitudinal beam, a chord member and a formwork adjusting lead screw. According to the tunnel underground excavation and lining constriction trolley and the tunnel underground excavation and lining construction method, a CRD construction method is effectively improved, by means of the trolley support system, a temporary support system can break median lamella and an inverted arch in one time, the construction period is greatly shortened, and the construction cost is saved; secondary lining is achieved through one-time steel bar binding and pouring, construction joints caused by multiple formworking are reduced, water seepage hidden danger is reduced, and the strength of secondary lining, the smoothness of the outer surface and the overall flatness of concrete are guaranteed.

The invention relates to a self-balancing external prestressing strengthening method for a bridge structure. The self-balancing external prestressing strengthening method is characterized by comprising the following steps of: carrying out interface processing at a connecting place (5) of a top flange of a concrete beam; (2) inserting reinforced bars at the connecting place (5) of the top flange of the concrete beam; (3) installing the reinforced bars at the connecting place (5) of the top flange of the concrete beam; (4) installing the reinforced bar of a steering block (6) and a diverter (9) at the bottom of the beam; (5) symmetrically adding diaphragm plates at a place far away from the end of the beam by 2-3m, and installing an anchorage device (10); (6) concreting the connecting place (5) of the top flange of the beam, the steering block (6) and the newly added diaphragm plates (8); and (7) installing and tensioning an anchoring external cable, thus obtaining a self-balancing external prestressing strengthening structure. An external prestressing system can be used for detecting and adjusting the stress of the cable at any time, inspecting the corrosion condition of the cable and can also be used for maintaining and replacing the cable when necessary. The self-compacting concrete solves the problems of dense reinforcement assembly, complex structure, narrow space of formworks and traditional structural members, cavities caused by the blocking of aggregates and the like, effectively ensures the dense degree of placing concrete and increases the strengthening effect. The self-balancing external prestressing strengthening method can be used for strengthening heavy railroad brides, concrete box girders and T beams.

The invention relates to the technical field of building construction, in particular to a measurement, control and construction method for a curved roof formwork system. Projection division is carried out on a curved surface of a concrete roof in measurement location, and the space elevation of any point on the curved surface can be accurately calculated through the coordinate plane conversion calculation formula. With the axis as the basis, the horizontal projection of the curved surface is divided into a plurality of small-specification grids, then the elevation of the grid nodes of the grids is calculated for carrying out measurement and location, and finally the grids are connected to form a smooth spatial curved surface for serving as the basis of setting up the curved roof formwork system. According to the elevation, back purlins are cut in a lofting mode, common formworks and bamboo clamp plates are used cooperatively for forming a bottom formwork of the curved roof formwork system, steel pipe cross rods are set up to support the bottom formwork, and bent steel bars are laid on the bottom formwork which is set up. According to the invention, the measurement difficulty and the construction labor intensity are lowered, the construction progress is accelerated and the construction quality is improved.

The invention relates to the technical field of biomaterials, is particularly suitable for the field of preparation of biomedical tissue engineering support materials, in particular to a method for preparing porous materials used by a tissue engineering support. The method is to adopt mechanical processing technology to prepare the porous materials, to use the porous materials in the tissue engineering support, and to provide a three-dimensional space for adhesion, growth and so on of cells. The mechanical processing method comprises laser processing technology and digital control drilling processing technology. The porous materials prepared by the mechanical processing method have a permeable porous structure, wherein the porosity is between 5 and 99 percent, and the aperture is between 50 and 900 mu m. The method can prepare various metallic materials, wherein the laser drilling technology can also prepare porous polymer materials, ceramic materials, composite materials and so on and have wide application scope.