13 results about "Short lifetime" patented technology

The invention provides an organic electroluminescent device, and particularly relates to the technical field of organic electroluminescence. In order to solve the problems of low luminous efficiency and short service life of the device in the prior art, the invention provides the organic light-emitting device with excellent performance. The hole transmission region comprises a triarylamine compound represented by a formula 1, the electron transmission region comprises a fluorene compound represented by a formula 2, and the triarylamine compound and the fluorene compound can effectively block electrons transmitted to the light-emitting layer and diffusion of holes to the hole / electron transmission layer, so that the probability that the holes and the electrons are compounded into excitons in the light-emitting layer is increased, and the light-emitting efficiency of the device is improved; and device aging caused by leakage of electrons and holes into the hole transport layer and the electron transport layer is avoided, so that the service life of the device is prolonged. The preparation method of the compound is simple, raw materials are easy to obtain, and the compound can be widely applied to the fields of lighting sources, organic thin film transistors and the like and has good industrialization prospects.

Electron sources that emit electrons by tunneling through a solid have the problem of having a short lifetime. This invention provides a new planar electron source with a long lifetime and a method for manufacturing the same. [Solution] The electron source comprises a graphene layer 130 having a planar electron emission area 150 on one side, and a p-type semiconductor layer in direct contact with the other side of the graphene layer 130. As a result, electrons are accelerated in the depletion layer within the p-type semiconductor layer. Preferably, the p-type semiconductor layer has a depletion layer with a width of 2.91 nm to 30 nm. [Effects] Unlike MIS-type electron sources, electrons are not accelerated within the insulating layer, so dielectric breakdown, which occurs when a large number of electrons travel through the valence band of the insulator, does not occur, resulting in a long-life electron source.

The application belongs to the field of phosphorescent materials and information encryption technology, and particularly relates to a visible light excited long lifetime phosphorescent carbon dot film and a preparation method and application thereof. In order to solve the problems that the phosphorescent material cannot be excited by visible light and the phosphorescent lifetime is short in the prior art, polyvinyl alcohol is used as a carbon source precursor, anhydrous ethylenediamine is used as a crosslinking agent, and after a reaction solvent is added, the nitrogen-doped carbon dots (N-CDs) are formed by reaction under high temperature conditions, and the N-CDs are added into a polyvinyl alcohol aqueous solution to prepare the visible light excited long lifetime phosphorescent carbon dot film. The visible light excited long lifetime phosphorescent carbon dot film (N-CDs@PVA film) provided by the application can be excited by visible light and has a tunable lifetime, and compared with organic metal complex materials, has the advantages of simplicity, rapidness, metal-free, long lifetime, economic effectiveness, low toxicity and the like.

The server acquires first data concerning a load applied to a body of an electric mobile apparatus, acquires second data concerning the performance of a storage battery mounted on the mobile apparatus, calculates a remaining lifetime of the body on the basis of the first data, calculates a remaining lifetime of the battery on the basis of the second data, compares the remaining lifetime of the body with the remaining lifetime of the storage battery, and instructs at least one of an activation of an unused function and an enhancement of a used function among a plurality of functions consuming the electric power of the mobile apparatus when the remaining lifetime of the body is shorter than the remaining lifetime of the storage battery.

The utility model provides a spiral opening and closing type plastic shut-off stop valve, and belongs to the technical field of valve manufacturing. The problem that an existing stop valve is short in service life is solved. The spiral opening and closing type plastic shut-off stop valve comprises a valve body and a valve cover, a valve rod is in threaded connection with the interior of the valve cover, filler is arranged between the valve cover and the valve rod, a pressing cover penetrates through the top of the valve cover, a first screw penetrates through and is fixedly connected to the bottom end of the valve rod, and a sealing plate fixedly sleeves the surface of the first screw; a rubber pad is fixedly connected to the bottom of the sealing plate, threaded holes are formed in the two sides of the valve deck, inner cavities of the threaded holes are in threaded connection with limiting mechanisms, the limiting mechanisms comprise limiting bolts, and limiting grooves are formed in the top of the surface of the valve deck. According to the utility model, the pressing cover can be limited and fixed, so that the pressing cover does not fall off when being subjected to water pressure impact and frequent opening and closing actions, and the sealing performance is further improved.

This invention relates to a self-balancing multistage pump with axial force, solving the problems of high energy consumption, short lifespan, and poor operational stability caused by the large axial force generated by the equal outer diameter of the front and rear cover plates and a specific speed (ns>300) in existing technologies. The technical solution includes a pump body, an impeller string housed within the pump body, and several sets of impeller units within the impeller string. The key feature is that each impeller unit includes a guide shroud, an impeller housed in the guide cavity of the guide shroud, and the impeller comprising a front cover plate, a rear cover plate, and blades disposed between the front and rear cover plates. The outer diameter of the front cover plate is larger than that of the rear cover plate. The front cover plate mates with the bottom of the guide cavity and with the open portion of the guide cavity. Its effects are: by using an impeller with a front cover plate area larger than the rear cover plate area, and in conjunction with the guide shroud, self-balancing of the impeller axial force is achieved, making the pump operation more stable and reliable, significantly reducing power consumption, greatly improving social and economic benefits, and achieving the goal of energy conservation and emission reduction.

The invention discloses an LED lamp capable of adjusting a projection angle, relates to the technical field of lighting equipment, and aims to solve the problems that an existing table lamp support arm is short in service life, limited in adjustment and tedious in operation. The LED lamp comprises a mounting base, an LED lamp body, a supporting frame and a mounting frame, a driving structure is arranged in the supporting frame, and a rotary connecting structure and an up-down moving structure are arranged on the mounting frame. The driving structure can independently drive the rotating connecting structure to achieve left-right angle adjustment of the LED lamp or drive the up-down moving structure to drive the LED lamp to swing up and down. The up-and-down moving structure can be limited when connected with the LED lamp, and the LED lamp is prevented from naturally swinging down due to gravity. Through cooperation of a rigid structure, the service life is prolonged, multi-direction flexible adjustment is achieved, operation is easy and convenient, and an independent lock is not needed.

The invention discloses a blue light laminated organic light-emitting device and a preparation method thereof. The blue light laminated organic light-emitting device comprises at least two blue light-emitting units which are connected in series through a charge generation layer, and each electroluminescent unit internally comprises a sandwich type core constraint structure of an electron blocking layer / blue light emitting layer / hole blocking layer. The unique double-side constraint structure can efficiently limit carriers and excitons in emission layers of respective light-emitting units, so that non-radiation quenching of the excitons on a functional layer interface and a charge generation layer interface is greatly inhibited. In addition, rare earth metal is preferably adopted as an n-type doping agent in the charge generation layer, so that the operation stability of the charge generation layer is improved. The laminated device structure cooperatively solves the technical problems that an existing blue light OLED is low in efficiency and short in service life, and an extra attenuation path exists in a laminated device, and excellent luminous efficiency, extremely low efficiency roll-off and excellent working stability are achieved.

This application discloses a data storage method, apparatus, and sensor. The data storage method includes writing data to a storage block according to the arrangement order of storage sectors and the arrangement order of storage blocks within their respective storage sectors each time data is written. After N storage sectors are filled, the next data write operation loops back to the first storage block of the first storage sector. Specifically, this includes: locating the position of the previous storage block based on the data status of the data stored in each storage block, or locating the position of the previous storage block based on the data status and the number of writes; determining the position of the target storage block for the current data to be written based on the previous storage block, and writing data to the target storage block. This application solves the problems of short FLASH lifespan, easy data loss, and poor anomaly recovery capability caused by traditional single-sector centralized storage, and has the technical effect of improving FLASH lifespan and enhancing data storage reliability and fault tolerance.

The invention discloses a working method and device of storage equipment, equipment and a storage medium, and the method comprises the steps: monitoring the PECS frequency of the storage equipment in real time, and obtaining a first monitoring parameter; wherein different storage devices carry storage media of different transmission types, and the storage media of different transmission types correspond to different PECS frequency thresholds; comparing the first monitoring parameter with a PECS frequency threshold corresponding to a storage medium of the storage device; if the first monitoring parameter reaches the PECS frequency threshold, switching the current working mode of the storage device to a target working mode; wherein the data transmission density of the target working mode is lower than that of the current working mode. Therefore, the loss is reduced before the storage medium reaches the life threshold, the problem of short life of a high-density storage medium in the prior art is solved, and the method has the advantages of prolonging the service life of the storage device and keeping reasonable storage capacity at the same time.

The application belongs to the technical field of crystal preparation, and particularly relates to a kind of alpha-Al2Mo3O 12 Nanometer sheet, its preparation method and application. The application adopts chemical vapor deposition method to epitaxially grow high directional monocrystal nanometer sheet on c face sapphire substrate, improves crystal quality, reduces production cost, and can be mass produced. The application also provides nanometer sheet obtained by the preparation method. The nanometer sheet provided by the application is two-dimensional crystal composed of multiple layers of atoms, has extremely low thermal conductivity coefficient, and excellent chemical, optical and electronic properties. Systematic variable-temperature Raman spectrum research finds that characteristic phonon has extremely short lifetime, indicating that the nanometer sheet has extremely low thermal conductivity coefficient.

This invention discloses a method for designing the profile parameters of a ball screw pair operating under extreme temperature conditions, comprising: initially determining the profile design parameters of the ball screw pair; establishing a mathematical model of the raceway in the normal plane; mapping the raceway profile in the normal plane to the axial plane; performing thermal deformation calculations on the raceway profile and simultaneously on the balls; mapping the profile in the axial plane after thermal deformation to the normal plane; performing circular arc fitting to calculate the raceway profile parameters after thermal deformation; determining whether the clearance value after thermal deformation meets the operating condition requirements; if not, modifying the profile parameters until the operating condition requirements are met; determining whether the contact angle after thermal deformation meets the allowable contact angle requirements; if not, modifying the profile parameters until the allowable contact angle requirements are met; and finally outputting the profile parameters under normal temperature conditions. This invention can solve the problems of short lifespan and unusability of ball screw pairs designed at normal temperature under extreme temperature conditions.

The utility model belongs to the technical field of aviation mechanical control, and relates to a locking type metal conduit flexible connection structure which comprises a pipe connection seat, a sealing ring, a pipe joint and a conduit, a plurality of clamping grooves are formed in the end face of the pipe connection seat, buckles matched with the clamping grooves are arranged on the end face, in butt joint with the pipe connection seat, of the pipe joint, and the pipe connection seat and the pipe joint are connected in a matched mode through the clamping grooves and the buckles. According to the utility model, the problem that the assembly between the conduit and the pipe joint seat is affected by manufacturing and mounting errors, so that the conduit and the pipe joint seat are forcibly mounted or cannot be mounted is effectively solved, and meanwhile, the defects of large volume, high weight cost, short service life and the like caused by the use of a flexible rubber pipe are avoided; the weight cost of the aircraft is reduced, the system maintainability is improved, and the flight efficiency is improved.