70results about How to "Avoid structural changes" patented technology

The invention relates to a memory and a forming method thereof, and a selection method of a storage unit of a memory. The forming method of the memory comprises the following steps: a storage base isprovided; the storage base comprises a substrate and a storage stacking structure formed on the front side of the substrate; a channel column structure and a separation wall for penetrating the storage stacking structure into the surface of the substrate are formed in the storage stacking structure; the back of the substrate is thinned; a dielectric layer is formed on the thinned back of the substrate; a contact part that penetrates the dielectric layer and is connected to the bottom of the channel column structure is formed; source lines are formed on the dielectric layer; and, the contact part located in the same one row is connected with the same one source line. The method provided by the invention is helpful for improving the storage density of the memory.

The invention discloses an oligonucleotide aptamer for specifically identifying patulin. Through a graphene oxide-based systematic evolution technology of ligands by exponential enrichment, a single stranded oligonucleotide aptamer capable of specifically identifying patulin is acquired. The aptamer can be converted into a report aptamer by marking functional groups and the like. The aptamer is used for detecting patulin. The sequence of the aptamer has a wide application prospect in accurately and quickly detecting patulin in a food.

The invention relates to a selective hydrogenation catalyst for C5 fraction cracking and belongs to the technology field of hydrogenation catalysts. In order to meet the urgent need of the selective hydrogenation catalysts for the C5 fraction cracking, the invention provides a catalyst for selective hydrogenation in the C5 fraction cracking, which contains the following components in the given mass percentages: Ni 10-35%, La 0.5-3%, Ag 0.3-3% and aluminum oxide carrier 59-89.2%, calculated on basis of the total mass of the catalyst. The catalyst can also contains K and/or Sr or Pb. The catalyst is used for selective hydrogenation in the C5 fraction cracking as well as hydrogenation in the C5 fraction cracking and excellent in conversion rate, selectivity and stability.

The invention provides a dual-mode vehicle-mounted radio station system, and the system comprises a first communication module which is used for achieving the GSM-R network communication; a second communication module which is used for realizing LTE-R network communication; and a selection control module which is used for controlling the system to select the first communication module or the second communication module for network communication. The first communication module and the second communication module are respectively powered by an independent power supply. The first communication module and the second communication module respectively employ standard chips and are combined with a peripheral circuit to realize GSM-R and LTE-R network communication. The first communication moduleand the second communication module perform data transmission through the same antenna unit; and the peripheral circuit comprises a signal conversion circuit arranged in the second communication module, and the signal conversion circuit is used for converting LTE-R network communication signals to a specified range and transmitting and receiving the signals through the antenna unit. The dual-moderadio station is wide in application range, low in cost and high in flexibility.

The invention provides a terminal structure which can prevent tin bonding; the terminal passes through the slot of an insulated base and extends out of the exterior of the insulated base so as to form a welding part; the appearance of the terminal is processed as an electro-plating layer; the terminal is provided with a naked area which is formed by the laser etching at the internal side of the welding part; furthermore, the naked area is provided with a tin collecting trough which prevents the tin bonding during the welding process of the welding part. Tin liquid is collected when the welding is carried out at the welding part, thus achieving the object of preventing the tin bonded to the terminal and avoiding the short circuit phenomenon of the terminal or the structural change of the terminal.

A surface of a LiCoO₂-based positive electrode active material to have a rock salt crystal structure is provided. Specifically, a positive electrode active material for a lithium rechargeable battery is provided, including: a core particle containing lithium cobalt oxide doped with aluminum (Al); and a coating layer positioned on a surface of the core particle and containing a cobalt(Co)-based compound having a rock salt crystal structure. A method of producing the positive electrode active material is also provided using a solid-phase method. The positive electrode active material can be applied to a positive electrode, lithium rechargeable battery, battery module, battery pack, and the like.

An HMT (head-mounted display) optical system provided with an adjustable exit pupil comprises a front fixing group, a zooming group, a compensation group and a rear fixing group. The position relation is shown as follows: with a microdisplay or a middle image plane as an object plane, the front fixing group, the zooming group, the compensation group and the rear fixing group are arranged sequentially, and each of the front fixing group, the zooming group, the compensation group and the rear fixing group is arranged in an axial symmetry manner relative to an optical axis; the front fixing group and the rear fixing group always keep unchanged in position in the zooming process of the optical system, and the zooming group and the compensation group move along the optical axis in accordance with respective curves in the zooming process of the optical system. A front focal plane and a rear focal plane of the optical system are kept fixed in the moving process of the zooming group and the compensation group, so that the front focal plane of the optical system and the object plane coincide, and the rear focal plane of the optical system and the exit pupil coincide. The optical system has the characteristics of being simple in structure, high in light energy utilization rate, high in imaging quality and the like and can realize expansion and intelligent adjustment of the exit pupil.

The invention discloses a nut hot-embedding device for automobile non-metal parts. The device comprises a fixed heating conveying mechanism; a nut feeding mechanism is arranged on one side of the fixed heating and conveying mechanism; a nut conveying mechanism is arranged on the other side of the fixed heating and conveying mechanism; a part feeding mechanism is arranged on one side of the nut conveying mechanism; the fixed heating and conveying mechanism comprises a fixed conveying mechanism and a heating mechanism; the fixed conveying mechanism comprises a first bed body; a first conveyor belt is arranged on the first bed body; fixed electromagnets are arranged on the first conveyor belt; the heating mechanism comprises a top plate; side plates are arranged at the two ends of the bottomof the top plate; heating pipes are arranged on the bottom of the top plate and the side surfaces of the side plates; and the part feeding mechanism comprises a fourth bed body. The device has the advantages that the fixed heating and conveying mechanism and the part feeding mechanism are arranged so that the hot-embedding work can be rapidly completed, meanwhile the heat loss after nuts are heated can be effectively prevented, and therefore the quality of the hot-embedding working can be improved, the labor cost can be lowered, and the practicability is high.

The invention relates to a measuring system for detecting OTDR by using symmetrical linear chirped pulses. The system can detect microsecond-level temperature or change trend of stress acting on an optical fiber to be detected in a distributed optical fiber sensor system by using the symmetrical linear chirped pulses as detection light; by utilizing the characteristics of electromagnetic resistance, corrosion resistance and high temperature resistance of the optical fiber, the system can be used in a high-risk environment for detection operation; linear chirped pulses are used as detection light and are symmetrical pulse light in a frequency band range, and at an acting point of the to-be-measured optical fiber, backward Rayleigh scattering is used, and two detection wave crests are reflected back; a microsecond-level time difference exists between the two wave crests, so that the two wave crests reflect different disturbances; and the change trend of the to-be-measured physical quantity measured between the two wave crests, namely in the microsecond order of magnitude, is extracted through modulation and demodulation of the two waves, and the defects that a traditional distributedoptical fiber sensor needs to sweep frequency continuously, can only measure the dependent variable and needs long time are overcome.

Implantable materials for medical or surgical applications comprising specific chemical groups on their surface to alter the physico-chemical properties of said material rendering it suitable implantation or biocompatible properties.

The invention provides a memory card connecting device, which comprises a memory card connecting module and a stopping part. The memory card connecting module can accommodate a memory card and is electrically connected with the memory card; and the stopping part is arranged on one side of the memory card connecting module and comprises a seat, a supporting arm and a stopper, wherein the supporting arm is connected with the seat; and the stopper is connected to the supporting arm and corresponds to one side of the memory card so as to stop the memory card. Due to the stopping mechanism, the problem that the memory card falls off due to insufficient clamping force in a vibration environment can be solved.

The invention relates to a preparing method for a nickel tin-carbon-silicon electrode material. According to the material, silicon oxide with the high specific surface area is used as a raw material, mechanically mixed with magnesium, reduced in a high temperature thermal mode, treated in an acid mode, and coated with a conducting polymer, nickel oxide and tin oxide are deposited, and tabletting and high-temperature thermal reducing are carried out, so that the nickel tin-carbon-silicon electrode material is obtained; the specific surface area of silicon oxide is larger than 700 m<2>/g, and silicon oxide is one of silicon oxide nanometer powder, silicon oxide nanospheres, silicon oxide SBA-15, silicon oxide MCM-41 and silicon oxide KIT-6; the conducting polymer is one of polyaniline, polypyrrole, polythiophene and polyacetylene; the molar ratio of silicon oxide to magnesium is 1:(2-4), the molar ratio of silicon oxide to the conducting polymer precursor is 1:(1-5), the molar ratio of nickel oxide to the conducting polymer precursor is 1:(1-20), and the molar ratio of nickel oxide to tin oxide is 3:(1-8). The composite material has the advantages of being stable in structure and good in conductivity, having high specific capacity and excellent cycle performance when being used in a negative pole of a lithium battery, and having a good application prospect in the field of the batteries.

The invention relates to the technical field of laser radars, in particular to a laser emission device and a laser radar. The laser emission device comprises a laser emission array (110), a first laser emission unit group (120) and a first emission optical adjustment unit group (140); the laser emission array (110) comprises a first laser emission unit group (120); the first laser emission unit group (120) comprises a plurality of first laser emission units (122); the first emission optical adjustment unit group (140) comprises a plurality of first emission optical adjustment units (142); a first emission optical adjustment unit (142) in the first emission optical adjustment unit group (140) is arranged corresponding to a first laser emission unit (122) in the first laser emission unit group (120), and is used for adjusting the emitting direction of a laser signal emitted by the first laser emission unit (122) in the first laser emission unit group (120); a laser beam emitted by the first laser emission unit (122) is aligned at a close distance to the detection field of view. The measurement efficiency of the laser radar on the close-range object is improved.

A positive electrode active material for a secondary battery is provided. The positive electrode active material being a lithium cobalt-based oxide includes a doping element M. A lithium cobalt-based oxide particle containing the doping element M in an amount of 3,000 ppm or more, wherein in a bulk portion corresponding to 90% of a core side among the radius from a core of the particle to a surface thereof, the doping element M in the lithium cobalt-based oxide particle is contained at a constant concentration, and in a surface portion from the surface of the particle to 100 nm in a core direction, the doping element M is contained at a concentration equal to or higher than that in the bulk portion and has a concentration in which the concentration thereof is gradient gradually decreased in the core direction from the surface of the particle.

The invention relates to a fluorophosphate coated lithium titanate composite material as well as a preparation method and application thereof. The composite material is prepared from lithium titanateand a fluorophosphates coated layer which covers the surface of the lithium titanate. The method comprises the following steps: dissolving the lithium titanate into a solvent; after uniformly stirring, adding fluorophosphates; carrying out low-temperature spraying and drying to form a fluorophosphates coated object on the surfaces of lithium titanate particles; then carrying out microwave-method high-temperature sintering to obtain the fluorophosphate coated lithium titanate composite material. According to the fluorophosphate coated lithium titanate composite material provided by the invention, the discharging capacity, the circulating performance and the rate performance are remarkably improved; a lithium-ion battery which is prepared by taking the composite material as a negative electrode material not only has good conductivity, high rate capacity and long cycle life, but also has the advantage of less produced gas, so that the fluorophosphate coated lithium titanate composite material has a good industrial application prospect.