Keyboard and notebook computer using same

The invention relates to a keyboard and a notebook computer using the same; the notebook computer comprises a case and a keyboard; the keyboard is arranged on the case; the keyboard comprises a plastic frame and a metal back plate; the plastic frame comprises a plurality of plastic clamping hooks and a plurality of hot-melting columns, the metal back plate is provided with a plurality of hot-melting holes and comprises a plurality of metal clamping hooks, wherein, all hot-melting columns are clamped to the corresponding hot-melting holes after being hot-melted, so as to lead the plastic frame and the metal back plate to be clamped with each other. The hot-melting columns and the hot-melting holes are adjacent to the plastic clamping hooks and the metal clamping hooks.

Unmanned ship navigation direction control method and system

The invention discloses an unmanned ship navigation direction control method and system, belongs to the technical field of unmanned ship control, and aims to solve the technical problem of how to smoothly give a navigation instruction and guarantee smooth navigation under the condition that a signal is weak. The adopted technical scheme is as follows: the method specifically comprises the following steps: acquiring a navigation channel picture at regular time; obtaining gradient and distance of river banks on two sides; calculating left and right virtual safety boundaries and a virtual center line according to the gradient; judging whether the unmanned surface vehicle is on the left side or the right side of the virtual center line, judging whether the unmanned surface vehicle is inside or outside the left side safety domain and judging whether the unmanned surface vehicle is inside or outside the right side safety domain according to the advancing position and the divided area of the unmanned ...

Sound insulation screen

The utility model discloses a sound insulation screen. Round bottom plate, a supporting column is arranged on the inner end face of the round bottom plate. A screen plate is arranged on the supportingcolumn; soft connecting blocks are arranged at the inner ends of the screen plates; each soft connecting block comprises a rubber plate and a square inner cavity, each square inner cavity is formed in the corresponding rubber plate, each screen plate comprises a steel plate, a glass fiber layer, a sound insulation felt layer and a rock wool fiber layer, each glass fiber layer is arranged on the front end face of the corresponding steel plate, and each sound insulation felt layer is arranged on the front end face of the corresponding glass fiber layer. Flexible connection block, the screen plates can be mutually stacked and folded; the steel plate, the glass fiber layer, the sound insulation felt layer, the rock wool fiber layer and the rubber layer are arranged in the screen plate, a goodsound ...

Special purpose cement for low alkali glass fiber reinforced concrete and clinker production technology

The present invention relates to a low-alkali cement. Its formula includes 40-50% of improved sulpho-aluminate cement clinker, 5-20% of gypsum and 20-45% of admixture, in which the aluminium-sulfur ratio of the clinker is greater than 3.82, and its ingredients are 5-9% of SiO2, 28-40% of Al2O3, 2-4% of Fe2O3, 39-45% of CaO, 7-11% of SO3 and 1-5% of other material. The calcining temp. for production of clinker is 1300-1400 deg.C and the controlled clinker liter wieght is 750 plus or minus 100g/liter. When the invented product is used for making glass fibre-reinforced concrete product, it features non-shrink, small free-expansion, short setting time, free from after expansion and low alkali, and when the invented product is used for making GRC product, the retention rate of glass fibre strength can be stabilized to 80-90%, and its service life can be prolonged.

Crop conveying structure for shell crop seeding machine

The utility model discloses a crop conveying structure for a shell crop seeding machine. The conveying structure is a conveying part mounted on the seed threshing machine body; wherein the conveying part comprises two machine frames, a conveying belt and a driving structure, the two machine frames are arranged on the two side edges of one side of the seeding machine body respectively, a driving wheel and a driven wheel are arranged on the two machine frames respectively, the outer side of the driving wheel and the outer side of the driven wheel are sleeved with the conveying belt, and the driving wheel is connected with the driving structure. The device has the beneficial effects that grains and rhizomes of crops are separated and conveyed, so that the integrity of the rhizomes of the crops is kept in the seeding process, and collection and arrangement of waste materials of the crops after seeding are facilitated; by separating the rhizomes of the crops from the seeding part, a rhizomeseparation ...

Detachable desktop screen storage device

The utility model provides a detachable desktop screen storage device which is used for solving the technical problems that in the prior art, a desktop office area is limited, and post-processing is difficult after an adhesive hook is damaged, and comprises a desktop screen frame, a desktop screen pinch plate, a clamping block and a storage part. Wherein the desktop screen frame is an I-shaped aluminum profile and is provided with a clamping plate, and the clamping plate is matched with the I-shaped aluminum profile to form a channel; the desktop screen pinch plate is matched with the desktopscreen at the end part of the desktop screen frame to seal the end part of the desktop screen frame; the clamping block is matched with the channel, so that the clamping block can slide in the channelalong the extending direction of the channel; by implementing the technical scheme of the utility model, the technical effects of saving the desktop space, easily changing the position of the storageobject ...

Dynamic generalized user NOMA packet CCHN-MEC network unloading decision optimization method

The invention relates to a dynamic generalized user NOMA grouping CCHN-MEC network unloading decision optimization method, which comprises the following steps: firstly, under a given calculation unloading ratio, deriving to obtain an optimal solution of a local energy consumption minimization problem, i.e., local optimal CPU frequency allocation of a secondary user SU, secondly, solving the unloading energy consumption minimization problem through a convex optimization tool, and finally, solving the optimal CPU frequency allocation of the secondary user SU. The transmitting power and the transmission time of the CPU frequency SU which is calculated and allocated for each SU task in each NOMA group are obtained; finally, user calculation unloading ratio allocation of each time slot is learned according to a deep reinforcement learning algorithm based on SAC, and an optimal unloading decision is obtained. According to the invention, the energy consumption of the system can be greatly saved ...

Automatic temperature control adjustable gas acerbity removing method for persimmon and used acerbity removing cabin thereof

The invention discloses an automatic temperature control de-astringency method of persimmons, which can adjust gas. A closed space provided with a gas inlet and an exhaust outlet is built, carbon dioxide gas with the concentration between 80 and 95 percent is filled into the space, the temperature in the closed space is heated up and kept between 19 and 24 DEG C and after 36 to 48 hours, the de-astringency process is finished. The method has the advantages that 1. de-astringency time is shortened and total de-astringency can be realized for 36 to 48 hours; 2. the color of the persimmons is bright after de-astringency, the flesh has no change, when the persimmons are in the stage of hardness and brittleness, the persimmons can be kept for 7 days under room temperature and for 40 days under the condition of 0 DEG C, thus effectively prolonging shelf life; 3. mass production can be carried out and 20 to 40 tons of persimmons can be deastringent at a time.

Screen capable of being rotationally adjusted

The utility model discloses a screen capable of being adjusted in a rotating mode. Bottom plate, a circular groove is transversely formed in the upper end face of the bottom plate. A circular plate isinserted into the circular groove; a supporting rod is arranged in the center of the upper end face of the circular plate, a square frame is arranged on the upper end face of the supporting rod, a decorative plate is arranged on the middle side of the inner wall of the square frame, a circular movable groove is formed in the right side of the inner wall of the circular groove, a cylinder is inserted into the circular movable groove, and a spring is arranged at the right end in the circular movable groove. The conical circular rotating groove is in running fit with the conical circular rotating plate; stable rotation of square frame, the inner wall of the spherical groove abuts against the outer wall of the spherical head, the cylinder moves rightwards, the spring is compressed, the spherical ...

Laptop stand with storage space

The invention discloses a laptop stand with storage space. The laptop stand with the storage space comprises a U-shaped stand, wherein the lengths of the three support bars of the U-shaped stand are adjustable, support rods are respectively fixed on the end portions of the two U-shaped support bars of the U-shaped stand, and storage structures are extended at the other ends of the support rods. The laptop stand with the storage space can be used for holding pens, provide convenience for people to work, and expand the functions of the laptop stand. The arranged U-shaped stand is suitable for laptop computers of different sizes, meets different height requirements of the people, and is convenient and fast to operate.

Freely-combined multifunctional screen

The utility model discloses a freely combined multifunctional screen. Round bottom plate, a stand column is arranged in the center of the upper end face of the round bottom plate. A sleeve is arrangedon the stand column in a sleeving mode, a screen plate is annularly arranged on the outer wall of the sleeve, a clamping plate is arranged on the screen plate, a table plate is inserted into the clamping plate, a transverse plate is annularly arranged on the sleeve, a first sliding hole is formed in the transverse plate, a first plug pin is inserted into the first sliding hole, and an inserting groove is formed in the middle side of the lower end face of the table plate. The narrowest end of the table plate is firstly inserted between the clamping plates; meanwhile, the first plug pin is pulled downwards; when the table plate is completely inserted between the clamping plates, the first plug pins correspond to the inserting grooves, the first plug pins are inserted into the inserting grooves ...

Communication and computing resource joint allocation method for minimizing unloading cost of VR (Virtual Reality) system

The invention relates to a communication and computing resource joint allocation method for minimizing the unloading cost of a VR system based on NOMA-MEC in a CCHN, which can utilize a continuous convex approximation algorithm to jointly optimize downlink transmission power pm, n, m and n under the condition that an unloading decision alpha m and cellular resource block selection beta m, n of VR equipment are known. According to the method, the minimum CCHN total calculation unloading cost of the VR equipment under the NOMA-MEC system can be realized by reasonably distributing communication and calculation resources under the condition that the constraint of time delay and energy consumption of the VR equipment is met, and the complexity is relatively low.

Office table with tabletop screen

The utility model discloses an office table with a tabletop screen. Table board, supporting devices are symmetrically arranged on the two sides of the bottom face of the table board. Auxiliary structures are arranged at the bottom ends of trapezoidal brackets in the supporting devices; four-corner threaded holes in the rear side of the upper end of the table plate are in threaded connection with threaded holes in the upper end of the mounting plate through bolts; the utility model discloses an office table with a tabletop screen. Simple structure, convenience in mounting and dismounting, stable support, great convenience is brought to the arrangement of a user; moreover, the device can be used as required, the table board can be quickly mounted and supported through the supporting device;the stable auxiliary support is ensured through the auxiliary structure; rapid connection and placement of the screen plate are achieved through the connecting structure, stable reinforcement of the side ...

Method for applying fertilizer on fruit trees and forest trees by trunk coating process

The invention relates to a method for applying fertilizer on fruit trees and forest trees by a trunk coating process. The diluted fertilizer solution is brushed by a bristle plate on the smooth position of the trunk, which is 10-100 cm above the ground, and the coated fertilizer solution is 60-80 cm high. Application time: before germination in spring to flowering and leafing period, applying the fertilizer on the trunk for 2-3 times at the interval of 10-15 days; in young fruit growth and young sprout quick growth periods, applying the fertilizer on the trunk for 1-2 times at the interval of 10-15 days; and from fruit formation period to before leaf abscission, applying the fertilizer on the trunk for 2-3 times at the interval of 10-15 days. The invention increases the fertilizer utilization ratio, reduces the labor intensity, enhances the labor efficiency, quickly exerts the fertilizer efficiency, supplements nutrition in time, corrects abnormal conditions of tree growth due to lack of ...

Height-adjustable desktop screen

The utility model provides a height-adjustable desktop screen, which relates to the field of office furniture equipment and comprises a first screen arranged on a desktop, a lifting device, a limitingdevice and a second screen arranged on the lifting device, the limiting device comprises a groove, a compression spring, a clamping block, a clamping groove allowing the clamping block to be embeddedin a clamped mode, and a moving piece used for enabling the clamping block to move out of the clamping groove. The groove is formed in one side, far away from the tabletop, of the first screen; a groove opening of the groove faces the second screen, one end of the compression spring is fixed to the groove bottom of the groove, the other end of the compression spring is fixed to the clamping block, when the compression spring is in a natural state, the clamping block is partially embedded in the clamping groove in a clamped mode, and the clamping groove is formed in the side, facing the firstscreen ...

Method of recovering and reconstructing vegetation of mining land

The invention relates to a method of recovering and reconstructing vegetation of mining land, which comprises the following steps: clearing float stones and flattening broken stones; laying reticular fiber ecological mats along the slope; and punching holes on the laid ecological mats, mixing and uniformly stirring grass seeds, shrub seeds and loam soil, sowing the mixture into the holes, and then covering the holes by sun-shading nets. The invention can protect water and soil, i.e. prevent soil which is artificially covered on the slope of the broken stones from losing by covering the reticular fiber ecological mats, balance temperature, improve efficiency and prevent sand and dust from blowing.

Technique for activation burning of high-alumina cement and white cement

Activating burning technique for high-alumina and white cements features that chemical activating agent composed of clinker, industrial waste dregs and mineral ore is added to green stock of cement with an added amount of 2-7% that of the green stock for high-alumina cement and 2-8% for white cement. The content of Al2O3 is proper. Its advantages are low burnt temp., high yield of cement and saving coal.

Special purpose cement for low alkali glass fiber reinforced concrete and clinker producing process

Height-adjustable desktop screen

The utility model discloses a desktop screen with the adjustable height. The desk comprises a desk body, a lifting groove is formed in the upper surface of the table body; a guide rod is fixedly connected between two fixed plates arranged on the side surface of the lifting groove; a lead screw is mounted between the two fixed plates in a matched manner through a bearing; the lead screw is connected with a sliding block through a lead screw nut. The guide rod penetrates through a through hole in the side surface of the slider; according to the desktop screen with the adjustable height, the servo motor, the lead screw and the guide rod are arranged, so that the height of the screen plate is conveniently adjusted; high flexibility, by arranging the connecting plate and the fixing base, desktop potted plants and the like can be conveniently placed; attractive performance, the height-adjustable desktop screen is simple in structure, living goods can be hung conveniently through the suckersand ...

Desktop screen with observation window

The utility model discloses a desktop screen with an observation window. Mounting plate, a screen plate is arranged in the center of the upper surface of the mounting plate; two grooves are formed ineach of the front side and the rear side of the screen plate; the two grooves are respectively positioned at the left end and the right end of the screen plate; the two sides of the left end and the right end of the screen plate are connected with side baffles through hinges. A through hole is formed in the middle of the screen plate; people can communicate more conveniently through the transparent glass window; the shielding plate can be driven to move by shifting the handle to move; the transparent glass window can be closed through the shielding plate; adjustment is more convenient, the desktop screen with the observation window is simple in structure and convenient to adjust, observation and communication of people can be more convenient, and paper slips can be more conveniently inserted ...