Abstract: A first communication device generates a first physical layer (PHY) data unit that includes information indicating a capability to use a channel bandwidth greater than a maximum channel bandwidth of the first communication device, and transmits the first PHY data unit to a second communication device during an association process with the second communication device. The first communication device generates a second PHY data unit that includes information indicating a capability to use at most the maximum channel bandwidth of the first communication device, and transmits the second PHY data unit to the second communication device when the first communication device is associated with the second communication device.

Abstract: A backlight driving method and a display panel are provided. The backlight driving method provided by the present application uses pulse width modulation technology to modulate a low-level pulse width of a scan signal. By increasing a low-level pulse width to increase the pulse period, a number of high-level pulses is reduced, thereby reducing a high-level pulse time. Therefore, a time for a TFT to receive a high-level voltage is also reduced, thereby improving a stability of the TFT and also improving a problem of a threshold voltage drift of the TFT.

Abstract: This application provides a benzoxazine resin and a preparation method thereof, and an adhesive. The benzoxazine resin is represented by the following formula: where R1, R2, R3 and R4 are each independently selected from the group consisting of —H, alkyl, alkoxy, cycloalkyl, and aryl, and at least one of R1, R2, R3 and R4 is —H; X1 is an alkyl or/and alkoxy containing a long chain structure in main chain or side chain; X2 is one or more selected from alkyl, ether group, alkoxy, alkyl ester group, carbonyl, sulfone group, and thioether group; and n is 1-150.

Abstract: Embodiments of a method and apparatus for wireless communications are disclosed. In an embodiment, a wireless device includes a wireless transceiver configured to receive a first frame from a first wireless access point (AP) for multi-AP coordination that is not associated with the wireless device and a second frame from a second wireless AP for multi-AP coordination that is associated with the wireless device and a controller configured to set a network allocation vector (NAV) timer of the wireless device to a non-zero value in response to the first frame and the second frame. The wireless transceiver is further configured to transmit a physical protocol data unit (PPDU) to the second wireless AP even if the NAV timer of the wireless device is non-zero.

Abstract: This application provides a resin composition and an adhesive. The resin composition is composed of benzoxazine and a resin. The benzoxazine is synthesized from a primary amine-capped flexible polyimide oligomer, an aldehyde and a monofunctional phenolic compound. The resin contains one or more of an epoxy resin, a maleimide resin, and a cyanate ester resin containing two or more functional groups. The resin is 0.1%-70% by weight of the benzoxazine.

Abstract: An air cooking device includes a main unit and a drawer structure, wherein the main unit is provided with an internal cavity, and the drawer structure includes a drawer panel and a frying bucket fixed on the back side of the drawer panel. The drawer structure can be pushed into the cavity to perform the operation of air frying cooking. The main unit includes a top wall above the cavity, and the air cooking device also includes a sealing element, with the sealing element being provided between a mouth portion of the frying bucket and the top wall of the cavity to prevent oil fumes in the frying bucket from escaping between an edge of the mouth portion of the frying bucket and the top wall of the cavity.

Abstract: A soil conditioner spreader and an operation method thereof are provided. The soil conditioner spreader includes a spreader body, a ridger, a solid tank, two spiral drills, a rotary tillage wheel and a mulching device, where the spreader body is provided with a hopper in a front part. The hopper stores a conditioner. The solid tank is arranged above the spiral drills. The spreader body is connected to the solid tank through a feeding track. The ridger, the spiral rills, the rotary tillage wheel and the mulching device are successively arranged at the bottom of the spreader body from the rear to the front. The ridger ridges first, and then the spiral drills perform deep plowing, rotary tillage and scarification and apply the conditioner to a ridge. The rotary tillage wheel performs rotary tillage, and a nozzle sprays a nutrient solution or an herbicide/insecticide. Finally, the mulching device mulches.

Abstract: A coffee maker comprises a body and a brewing device, the body comprises an abutting portion, and the brewing device comprises a receiving apparatus and a top lid movably assembled on the receiving apparatus. The receiving apparatus is provided with a receiving chamber. The top lid is located above the receiving chamber. The brewing device is movable so that the top lid can be switched between a closed state and an opened state. When the brewing device is moved to a position near the body, the abutting portion abuts the top lid so that the top lid is switched to the closed state. When the brewing device is moved forward to a position away from the body, the top lid is disengaged from the abutting portion and the top lid is automatically switched to the opened state without having to be manually raised, thus enabling convenient operation.

Abstract: A reel mechanism and a winding device for a flexible copper clad laminate includes a rotating roller, a winding belt wound on the rotating roller for winding the flexible copper clad laminate, first and second limit structures arranged one side of the winding belt away from the rotating roller. A space between the first limit structures and the second limit structures accommodates the flexible copper clad laminate. When the winding belt is wound with multiple layers outside the rotating roller, adjacent layers of the winding belt are spaced apart by the first and second limit structures. Since a protruding height of the first limit structures is equal to a protruding height of the second limit structures, and intervals between adjacent layers of a composite coil formed by the winding belt and the flexible copper clad laminate are equal, which avoids adhesion and copper foil surface oxidation.

Abstract: An air fryer drawer includes a panel, a fryer basket fixed to the rear side of the panel to receive food to be fried, and a handle disposed at the front side of the panel, the panel being provided with a transparent area through which a user can observe the conditions of the food being fried in the fryer basket. The handle includes a grip handle segment, and is capable of rotating between a first state and a second state relative to the panel, the grip handle segment being located at the front side of the transparent area when the handle is in the first state to facilitate manipulation of the grip handle segment, and the grip handle segment being deviated from the transparent area when the handle is in the second state to facilitate observation of the conditions of the food being fried in the fryer basket.

Abstract: A large-angle sloping roof steel structure connected to a main body structure, including: an intermediate platform, inclined main supporting steel columns circumferentially connected at four corners of the intermediate platform, constructing steel columns and wind-proof surrounding beam connected between top ends of the inclined main supporting steel columns, where roof purlin are connected between the adjacent inclined main supporting steel columns at intervals. The invention provides a top-down inverted construction method for a large-angle sloping roof with a steel structure as the main structural form. By using the method, the operation safety of an inclined main stressed vertical member during the installation process can be ensured, and the investment of supporting measures is reduced by preferentially installing the intermediate platform, thus effectively ensuring the installation progress, quality and safety of the sloping roof steel structure.

Abstract: An air cooking device includes a main unit and a drawer structure, wherein the main unit is provided with an internal cavity, and the drawer structure includes a drawer panel and a frying bucket fixed on the back side of the drawer panel. The drawer structure can be pushed into the cavity to perform the operation of air frying cooking. The main unit includes a top wall above the cavity, and the air cooking device also includes a sealing element, with the sealing element being provided between a mouth portion of the frying bucket and the top wall of the cavity to prevent oil fumes in the frying bucket from escaping between an edge of the mouth portion of the frying bucket and the top wall of the cavity.

Abstract: An air cooking device is equipped with a cooking cavity and includes a heating device located above the cooking cavity, a temperature measuring device, and a fan, wherein the fan is used to suck up the wind in the cooking cavity and blow it towards the heating device, and the hot air blows to the cooking cavity to cook food. The temperature measuring device is used to detect the temperature in the cooking cavity. The air cooking device also includes a shielding cover between the heating device and the temperature measuring device, where the shielding cover shields the heating device from radiating to and heating the temperature measuring device, so as to improve the accuracy of the temperature measurement of the temperature measuring device.

Abstract: An air cooking device is equipped with a cooking cavity and includes a heating device and a fan above the cooking cavity. The fan is used to suck up the wind in the cooking cavity and blow it toward the heating device, and the hot air blows to the cooking cavity to cook food. The air cooking device includes a protective cover under the fan. The protective cover includes an air inlet, an air outlet, and a shielding portion between the air inlet and the air outlet. The shielding portion is located under the heating device to prevent the heating device from directly heating the ingredients in the cooking cavity, and to prevent the surface of food from becoming burnt.

Abstract: A polyimide precursor which is characterized by: containing, as a structural unit derived from a diamine, a structural unit derived from 2,2-bis(trifluoromethyl)benzidine in an amount of 60% by mole or more with respect to all structural units derived from a diamine; and containing, as structural units derived from a tetracarboxylic dianhydride, structural units derived from one or more kinds selected from 4,4?-(2,2?-hexafluoroisopropylidene)diphthalic dianhydride and 4,4?-oxydiphthalic dianhydride in a total amount of 20% by mole or more with respect to all structural units derived from a tetracarboxylic acid dianhydride, in which a yellowness index (converted for a film thickness of 10 ?m) for a polyimide obtained by imidization is 10 or less, and a tear propagation resistance is 1.0 mN/?m or more.

Abstract: Disclosed belongs to the technical field of oil and gas field development engineering, and particularly relates to a super heavy oil development method for strengthening an SAGD steam chamber to break through a low physical property reservoir. The super heavy oil development method for strengthening the SAGD steam chamber to break through the low physical property reservoir includes the following steps: (1) selection of a developed oil reservoir; (2) well distribution; (3) steam chamber forming; (4) steam chamber expansion; (5) steam chamber strengthening. The method may enhance the ability of the steam chamber to break through the low physical property reservoir, enlarge the development height of the steam chamber, and further improve the SAGD development effect of super heavy oil.

Abstract: A large-angle sloping roof steel structure connected to a main body structure, including: an intermediate platform, inclined main supporting steel columns circumferentially connected at four corners of the intermediate platform, constructing steel columns and wind-proof surrounding beam connected between top ends of the inclined main supporting steel columns, where roof purlin are connected between the adjacent inclined main supporting steel columns at intervals. The invention provides a top-down inverted construction method for a large-angle sloping roof with a steel structure as the main structural form. By using the method, the operation safety of an inclined main stressed vertical member during the installation process can be ensured, and the investment of supporting measures is reduced by preferentially installing the intermediate platform, thus effectively ensuring the installation progress, quality and safety of the sloping roof steel structure.

Abstract: Disclosed belongs to the technical field of oil and gas field development engineering, and particularly relates to a super heavy oil development method for strengthening an SAGD steam chamber to break through a low physical property reservoir. The super heavy oil development method for strengthening the SAGD steam chamber to break through the low physical property reservoir includes the following steps: (1) selection of a developed oil reservoir; (2) well distribution; (3) steam chamber forming; (4) steam chamber expansion; (5) steam chamber strengthening. The method may enhance the ability of the steam chamber to break through the low physical property reservoir, enlarge the development height of the steam chamber, and further improve the SAGD development effect of super heavy oil.

Abstract: A prepreg is a blend of a fiber reinforcement, a matrix resin and a filler. Based on 100 parts by mass of the prepreg, the fiber reinforcement is 20-60 parts by mass, the matrix resin is 20-65 parts by mass, and the filler is 10-40 parts by mass. The filler is a flame-retardant organic microsphere or a blend of the flame-retardant organic microsphere and an inorganic filler, and the particle size of the filler is preferably 0.1 microns to 15 microns. A copper-clad laminate and a printed circuit board are also disclosed. In various embodiments, the stability of material properties of the prepreg can be improved, the prepreg manufacturing process is simplified, the prepreg production efficiency is improved. Due to the high production efficiency of the prepreg, the manufacturing cost of the prepreg, the copper-clad laminate and the printed circuit board can be reduced.

Abstract: A copper-clad laminate includes an insulating substrate and a copper foil layer covering a surface of the insulating substrate. The insulating substrate includes at least one first insulating layer, and the first insulating layer is a blend of a surface fiber felt made of fibers and resin or a blend of a non-woven fabric-reinforced composite material and resin, and the copper foil layer is attached to an outer surface of the first insulating layer. The present disclosure also provides a printed circuit board, which is made from the copper-clad laminate of the present disclosure. The present disclosure also provides a method for manufacturing the printed circuit board. Compared with the related arts, the copper-clad laminate and the printed circuit board of the present disclosure have improved dielectric properties.