122results about How to "Avoid attenuation" patented technology

The utility model provides a high -strength anti -bending cooling structure of charging gun charging cable, including the upper cooling pipe and lower cooling pipe made of EPDM material, the upper cooling pipe and lower cooling pipe mutually adhere, and one end of upper cooling pipe and lower cooling pipe is provided with elbow joint respectively, and the other end of upper cooling pipe and lower cooling pipe is provided with straight pipe joint respectively, forms two side clamping grooves at the adhering place of upper cooling pipe and lower cooling pipe two sides, and is provided with charging wire in two side clamping grooves respectively, the outer wall of upper cooling pipe, lower cooling pipe and charging wire is covered with a wear -resisting layer, the upper and lower cooling pipe is set up mutually adhering, forms two side clamping grooves at its two sides, and is provided with charging wire in two side clamping grooves, one aspect of this arrangement makes charging cable overall strength to improve, and it is not easy to bend, and the upper and lower cooling pipe can also play the clamping, protection effect to charging wire, on the other hand, the upper and lower cooling pipe and charging wire adhere closely, and it is favorable to the cooling of charging wire.

The present application relates to the technical field of tethered unmanned aerial vehicle, and discloses an unmanned aerial vehicle energy supply system and method based on optical fiber cable, comprising: an energy supply station arranged on the ground or carried on a mother ship; a light flexible high-energy laser transmission optical cable, the first end of which is optically coupled with the energy supply station; and an unmanned aerial vehicle, which is provided with an optoelectronic conversion unit, the second end of the light flexible high-energy laser transmission optical cable being releasably physically connected with the optoelectronic conversion unit, for receiving a high-energy laser beam transmitted through the light flexible high-energy laser transmission optical cable, and converting the high-energy laser beam into electric energy through the optoelectronic conversion unit to provide all or part of the electric power required for flight and task load; through the laser-electric energy conversion mode based on the light flexible high-energy laser transmission optical cable, the decoupling of the hovering height and the operation radius of the unmanned aerial vehicle is realized, the restriction of the self-weight of the on-board battery on the flight performance is eliminated, and the unmanned aerial vehicle can still maintain stable hovering and long-time hovering in a complex airflow environment.

The application discloses a high-precision optical lens production grinding device, relates to the technical field of optical lens grinding, and comprises a grinding box and a connecting table arranged on one side of the grinding box. The inside of the grinding box is provided with a grinding assembly. The top of the connecting table is provided with a driving assembly. The driving assembly is used in cooperation with the grinding assembly. An adjusting assembly is connected to the driving assembly. The bottom of the grinding box is provided with a reflux filtering assembly. The reflux filtering assembly comprises a reflux box arranged at the bottom of the grinding box. The bottom of the reflux box is provided with a leakage hole. A bushing is arranged on the outer wall of one side of the reflux box. The high-precision optical lens production grinding device disclosed by the application can improve the cleanliness of the recycled grinding liquid, thereby guaranteeing the grinding effect of high-precision optical lenses.

The application relates to a height adjusting device and a storage library. The height adjusting device comprises a height adjusting structure and an adjusting wrench. The height adjusting structure comprises a supporting base, an adjusting sleeve, a floating top base and a locking assembly. The upper surface of the adjusting sleeve is provided with a first matching surface spirally rising around a second direction. The floating top base is movably sleeved on the supporting base and located above the adjusting sleeve. The upper surface of the floating top base is provided with a second matching surface corresponding to the first matching surface. The second matching surface spirally rises around the second direction. The locking assembly is arranged on the adjusting sleeve and the supporting base. The adjusting wrench is partially arranged around the side of the adjusting sleeve. The adjusting wrench can drive the adjusting sleeve to rotate around the first direction, so that the adjusting sleeve drives the second matching surface to be lifted through the first matching surface, and the floating top base is lifted relative to the supporting base. In this way, the height of the stand column can be adjusted, the height of the stand column in the storage library is conveniently adjusted, and the levelness of the track at the top of the storage library is ensured.

This invention provides a high-strength, pressure-resistant tapered roller bearing for tunnel boring machines (TBMs), relating to the field of core TBM components. It includes an inner bearing ring, an outer bearing ring, a bearing cage, rolling elements, a speed sensor, a lubrication discharge pipe, a waste liquid separator, and a switching mechanism. The outer bearing ring is located outside the inner bearing ring. The bearing cage is located outside the inner bearing ring. The rolling elements are located inside the bearing cage. The speed sensor is fixedly connected to the upper front end of the outer bearing ring. The lubrication injection pipe is fixedly connected above the outer bearing ring. The lubrication discharge pipe is fixedly connected below the outer bearing ring. The waste liquid separator is fixedly connected below the outer bearing ring and communicates with the lubrication discharge pipe. The switching mechanism is located outside the outer bearing ring, enabling intelligent switching between two lubrication media and solving the problem of limited applicability of tapered roller bearing lubrication systems in TBMs.

The invention discloses a refrigerant adjusting method, device and system. The method comprises the steps that the current refrigerant temperature difference between the first refrigerant temperature of an inlet of the air-cooled condenser and the second refrigerant temperature of an outlet of the air-cooled condenser is obtained; the current deviation between the current refrigerant temperature difference and the temperature difference reference value is determined; under the condition that the current deviation is not within the first range, a feedback control model based on a real-time error is called, the opening degree of a first adjusting valve is adjusted according to the current deviation, so that the deviation between the adjusted refrigerant temperature difference between the inlet and the outlet of the air-cooled condenser and the temperature difference reference value is within the first range, and the first adjusting valve communicates with the air-cooled condenser; according to the scheme, the fluctuation of the key heat exchange parameter (temperature difference) is actively restrained within a set reasonable range, system performance degradation or operation risks caused by large drifting of parameters are effectively avoided, stable and reliable operation of the whole system is guaranteed, and the technical problem that the operation stability of an evaporation cold and heat pump unit system is low can be solved.

The application discloses a brake footboard device and a vehicle, which comprises a mounting bottom plate, a brake valve, a brake footboard mechanism and an angle detection module. The valve top of the brake valve extends upward from the mounting bottom plate. The brake footboard module of the brake footboard mechanism is installed on the mounting bottom plate through a first overturning installation module. The pressing member is arranged on the lower side of the brake footboard module and faces the valve top. The brake footboard module overturns downward and drives the pressing member to press the valve top under the action of the foot pedal force. The brake footboard module overturns upward and returns to the initial posture under the condition that the foot pedal force is removed. The angle detection module is used for brake control of the transmission system of the vehicle according to the downward overturning angle of the brake footboard module. The pedal stroke and the brake force curve are close to the ideal linear relationship, the power transmission path is simple, the energy loss is small in the transmission process, the brake force is prevented from being greatly attenuated, the advantages of electric control and mechanical brake are combined, the brake force is quickly improved, and the brake distance is shortened.

The application belongs to the technical field of biological medical materials, and discloses a polydopamine modified modified nano-graphyne and a preparation method and application thereof. In the method, the polydopamine coating is combined with the nano-graphyne for the first time to construct a GDY@PDA composite system, and the core defects of the blocky graphyne, such as easy agglomeration, poor water solubility and insufficient biocompatibility, are solved. The graphyne-based material is applied to the near-infrared two-region photothermal regulation of neural cell calcium influx for the first time, the calcium ion channel is activated through the local thermal effect of the material, and precise, remote and reversible calcium influx regulation is realized; the limitation that the traditional biocompatibility modification is easy to fall off and difficult to functionalize is broken through, the polydopamine modification makes the material have both photothermal efficiency and biological safety, and the application of the graphyne in the treatment of neural diseases (such as neural cell injury repair) is expanded.

This invention relates to the field of lithium battery heat dissipation technology, specifically disclosing a heat dissipation device for lithium battery packs, comprising a support plate and a top plate. The support plate and the top plate are arranged longitudinally symmetrically in parallel. Multiple sets of coaxially corresponding mounting holes 1 and 2 are arrayed along the length direction on their opposite end faces. Hollow sealing rings are fixedly installed on the inner walls of both mounting holes 1 and 2. Two symmetrically arranged side plates 1 and 2 are fixedly connected to the two side edges of the support plate and the top plate. The support plate, the top plate, the side plates 1 and 2 together form a cavity structure for accommodating the lithium battery pack and heat dissipation components. Several fan support frames are arrayed along the length direction of the side plates 1 facing the inner side of the cavity, and each of the fan support frames is equipped with a corresponding heat dissipation fan. The air outlet direction of the heat dissipation fan faces the inner cavity. This invention addresses the problem of the single heat dissipation function of lithium batteries.

The invention relates to the technical field of high-activity metal powder, in particular to high-environmental-stability aluminum-lithium alloy powder and a manufacturing method and application thereof.The high-environmental-stability aluminum-lithium alloy powder comprises, by weight, 1.0-10.0 wt.% of Li, 1.0-10.0 wt.% of Al, 1.0-10.0 wt.% of Ti, 1.0-10.0 wt.% of Ti, 1.0-10.0 wt.% of Ti, 1.0- 0.1 to 5.0 wt.% of Zr; 0.01 to 2.0 wt.% of Ti; 0.05 to 3.0 wt.% of RE; wherein RE is a rare earth element and at least comprises Y, Ce, La or a combination thereof, the sum of Zr, Ti and RE does not exceed 8.0 wt.%, and the balance is Al and inevitable impurities. The method has the effect of improving the use stability and the machining consistency of the aluminum-lithium alloy powder.

The invention relates to the technical field of wireless communication, in particular to a well site sensor signal wireless receiving and transmitting device and a sequence working method.The well site sensor signal wireless receiving and transmitting device comprises a wireless sensor host, a wireless receiving and transmitting host, a well depth system and a driller displayer, and the wireless sensor host is connected with a pressure sensor through a cable and communicates with the wireless receiving and transmitting host through an antenna; the wireless transceiver host is connected with the PC host through a USB cable and communicates with the driller display and the well depth system through antennas, and the well depth system comprises a well depth measuring instrument, a winch sensor, a hanging load sensor and a pressure sensor for well depth measurement. According to the wireless transmitting and receiving device for the well site sensor signals, through the wireless transmission technology, the time and labor cost of traditional cable wiring are reduced, the efficiency of well site operation is improved, the arrangement of the sensors is not limited by the length and position of cables through wireless transmission, the stability of signal transmission is improved, and the cost is reduced. Potential safety hazards caused by cable damage or faults are reduced, and the safety of well site operation is improved.

The present disclosure relates to a vehicle-mounted device and a vehicle. The vehicle-mounted device comprises a first isolation circuit and a first device module. The first end of the first isolation circuit is configured to be connected with a vehicle-mounted power supply. The first end of the first device module is configured to be connected with the vehicle-mounted power supply, and the second end of the first device module is connected with the second end of the first isolation circuit, so that the second end of the first isolation circuit and the second end of the device module can be connected with a terminal device through the same power line. The first isolation circuit is configured to present a high impedance value to communication signals of different frequency bands transmitted on the power line, and the high impedance value is any impedance value greater than a preset impedance value. The technical solution can improve the reliability and stability of the power line communication link in the vehicle-mounted power line communication scene of the intelligent networked vehicle.

The utility model relates to the cable field, and especially relates to a multichannel isolation shielding cable comprising a cable core, a composite shielding layer, a filling layer and a protection layer, the composite shielding layer wraps the cable core, and the filling layer is filled between the composite shielding layer and the protection layer; the composite shielding layer comprises an inner shielding layer, an insulating layer and a shielding tape layer, the inner shielding layer wraps the outer side of the cable core, the insulating layer wraps the outer side of the inner shielding layer, the shielding tape layer wraps the insulating layer, and a bonding layer is arranged on the side, making contact with the insulating layer, of the shielding tape layer. According to the utility model, near-field coupling and frequency band cross interference among the wire cores can be effectively reduced, and the anti-interference capability of the cable is significantly improved.

The invention provides an energy storage DC-DC control module structure device, and relates to the technical field of energy storage equipment, the energy storage DC-DC control module structure device comprises a module shell, the left side and the right side of the module shell are both provided with fixing supports, the left side of the module shell is provided with a first connector, the right side of the module shell is provided with a second connector, and the module shell is provided with a module upper cover. A sealing ring and a module PCBA are arranged in the module shell, the module shell is made of a high-strength alloy material, an installation groove matched with the installation of the module PCBA is formed in the module shell, a limiting structure is arranged on the wall of the groove, and the fixing support is assembled in the module shell. The space occupation and the carrying cost of the energy storage equipment are greatly reduced, the device is not only suitable for a fixed energy storage power station, but also can be flexibly applied to mobile energy storage scenes such as a portable energy storage power supply, a mobile charging station and a vehicle-mounted energy storage system, and the market application range of the product is effectively expanded.

The application relates to an image super-resolution reconstruction method and device based on anchor point guidance and boundary refinement cooperation, and belongs to the field of computer vision. The method comprises the following steps: performing shallow feature extraction on an input low-resolution image to obtain initial features; a deep feature enhancement network comprising multiple series cooperative reconstruction units is constructed, the initial features are input, and the initial features are sequentially enhanced by each unit; each unit performs anchor point routing global interaction and boundary perception region refinement on the input features to obtain global enhanced features and local refined features, the global enhanced features and the local refined features are fused through adaptive gating, and then the input features are fused through residual fusion, current cooperative enhanced features are output and are transmitted to the next unit, and finally, deep enhanced features are obtained; upsampling and pixel reconstruction are performed on the deep enhanced features, and a super-resolution image is output. The application considers long-distance structure dependence modeling and local boundary detail recovery, and realizes the cooperative optimization of global structure consistency and local detail fidelity under the constraint of lightweight deployment.

The invention relates to a single-wire communication method, a communication system, a readable storage medium and a program product, and the method comprises the steps: receiving a target carrier clock signal transmitted through a serial communication channel for an nth slave device; the target carrier clock signal is a carrier clock signal which is sent by the master device, carries an original carrier clock signal of target communication data, and is obtained after the original carrier clock signal is subjected to phase reversal processing of part or all of the first (n-1) slave devices; and decoding the target communication data from the target carrier clock signal by identifying the carrier level duration of the effective carrier level in the target carrier clock signal. In the transmission process of the carrier clock signal along the serial communication channel, the carrier clock signal is subjected to selective phase reversal processing by the slave device on the communication link, so that the problems of duty ratio distortion and signal attenuation caused by long-distance transmission can be effectively avoided, the accuracy and reliability of communication data transmission are guaranteed, and the transmission efficiency is improved. And the expandability of the communication system can be effectively improved.

This disclosure relates to a voice call processing method, circuit, apparatus, medium, chip, and terminal, belonging to the field of electronic technology, and can improve the sensitivity of signals used for proximity detection. A voice call processing method includes: during a voice call at the terminal, receiving a sampled signal acquired by the terminal's microphone, wherein the sampled signal includes a first voice signal and a proximity detection signal for proximity detection; filtering the sampled signal to remove the first voice signal and obtain the proximity detection signal; amplifying the filtered proximity detection signal; performing analog-to-digital conversion on the amplified proximity detection signal; and determining a proximity detection result based on the analog-to-digital converted proximity detection signal.

The utility model relates to a heat dissipation assembly and its charging box technical field discloses a kind of heat dissipation assembly and its charging box, the heat dissipation assembly includes shell, and shell inside is arranged with connecting plate, and the connecting plate is equipped with heat dissipation hole, and the heat dissipation assembly further includes heat dissipation fan, power supply and power port linkage, provide stable electric power for four groups of node instruments, and real-time feedback power supply state by two groups of LED indicator light, this modularization setting integrates power supply, heat dissipation, signal transmission in shell interior, while simplifying wiring complexity, when maintaining, can quickly locate fault node, reduce operation and maintenance cost.

The application belongs to the technical field of power system frequency modulation control, and discloses a hybrid energy storage control method for thermal power combined AGC frequency modulation, a thermal power unit AGC frequency modulation full-working-condition nonlinear dynamic model is constructed based on deep learning and an attention mechanism, the AGC regulation capacity boundary is calibrated in real time, and the actual operation characteristics of the unit are accurately matched; an improved adaptive VMD-wavelet packet multi-scale decomposition algorithm is used to split the frequency modulation instruction into three types of time scale components, and the execution subject is distributed in a targeted manner; the unit output is compensated in advance, the regulation dead zone is borne by the energy storage in full power, and the medium and high frequency instruction components can be tracked quickly; meanwhile, the power grid frequency disturbance is predicted and the instruction is corrected, so that the AGC regulation rate, accuracy and response time are improved; through cooperative power pre-distribution, the equipment fatigue accumulation and wear rate are reduced; for the hybrid energy storage, a three-target optimization model of SOC balance, minimum life loss and highest response priority is constructed, and differential life control is implemented.

The application discloses a micro-thermal battery activation device and relates to the technical field of micro-thermal battery activation. The device comprises a battery base body, a mounting seat is fixedly connected to the top of the battery base body, a filler is mounted at the bottom of the mounting seat, a plurality of ignition caps are inlaid between the filler and the bottom of the mounting seat, a circular ring seat is fixedly arranged in the mounting seat, a plurality of striking pins are vertically and slidably arranged in the surface circular holes of the circular ring seat through elastic members; three groups of force storage assemblies are arranged, each group of force storage assemblies corresponds to a group of trigger assemblies, the trigger conditions of the three groups of trigger assemblies are different, the force storage assemblies are matched with the trigger assemblies, multi-factor triggering in a complex environment is realized, the situation of activation failure is avoided, the force storage assemblies are in a non-force storage state in a non-triggering state, the spring is prevented from being in a stressed state for a long time, stress fatigue is avoided, and long-term preservation is more facilitated.

The utility model belongs to the technical field of electric hoists, and particularly relates to a lifting device based on an electric hoist, which comprises an electric hoist body, a lifting rope is arranged at the output end of the electric hoist body, a circular column is fixedly connected to the bottom of the lifting rope, a lifting hook is fixedly connected to the bottom of the circular column, and a protection mechanism is arranged at the bottom of the electric hoist body. The protection mechanism comprises an anti-collision assembly, the anti-collision assembly comprises a first circular plate fixedly connected to the bottom of the electric hoist body through a set of fixing blocks, a first through hole is formed in the first circular plate, a second circular plate is fixedly connected to a circular column, and a third circular plate is fixedly connected to the top of the second circular plate through a first spring; the utility model relates to an electric hoist, and aims to solve the problems that a conventional electric hoist does not take protective measures during ascending, so that a lifting hook possibly impacts key components such as a winding drum, a motor and a speed reducer of the electric hoist during ascending, and equipment is damaged and cannot work normally.

This invention provides a lithium titanium dioxide sodium phosphate anode material and an aqueous lithium-iodine battery based thereon, belonging to the field of secondary battery technology. The chemical formula of the lithium titanium dioxide sodium phosphate anode material is Li. x Na y Ti2(PO4)3, where 0

The utility model relates to hoisting and conveying equipment technical field discloses a hoisting trolley direction changing moving device, including mobile base, and mobile base is equipped with two groups, two groups of mobile base are fixedly installed together through a group of slide rods, the slide rod is in the shape of H, and the middle part of slide rod is provided with mobile base, and the bottom end fixed mounting of mobile base has the crane, and one group of speed reducer mechanism is arranged on the both sides of mobile base respectively, the inside of two groups of mobile base is rotatably installed with two groups of moving wheels respectively, and the inside of moving wheel is provided with brake mechanism, this hoisting trolley direction changing moving device, through the regulation contact pressure dynamic control moving speed, through accurate brake and deceleration control, effectively reduce the shaking of hoisting goods, improve hoisting operation stability and security.

The utility model discloses a liftable drawing faucet which comprises a tooth pipe and a water outlet elbow, the water outlet elbow is arranged on the inner side of the tooth pipe in a sleeved mode, a first O-shaped rubber ring is arranged on the outer side of the bottom of the water outlet elbow in a sleeved mode, a first clamping ring is installed on the inner side of the lower portion of the tooth pipe, and a second clamping ring is arranged on the outer side of the bottom of the water outlet elbow in a sleeved mode. The first clamping ring is clamped between the first O-shaped rubber ring and the second clamping ring, a guide inclined face is arranged on the inner side of the lower portion of the threaded pipe, a wear-resisting ring is installed on the inner side of the top of the threaded pipe, and a second buffering rubber ring is arranged at the bottom of the wear-resisting ring. The water outlet elbow is easy to lift, the first O-shaped rubber ring is supported by the first clamping ring to prevent the water outlet elbow from descending, the water outlet elbow is upwards pulled and limited by the second clamping ring, when the water outlet elbow is not used, the water outlet elbow can be pressed downwards, most of the water outlet elbow is retracted below the table top, the occupied space on the table is small, space resources are saved, meanwhile, the water outlet elbow is not prone to being touched, and the water outlet elbow is convenient to use. Usage is convenient and usage experience is good.

This invention relates to the field of time series forecasting technology and discloses a stock index forecasting method based on 1DCNN-ResBiLSTM, comprising the following steps: S1, data acquisition and sample construction; S2, data preprocessing; S3, local feature extraction; S4, long-term dependency learning; S5, residual feature fusion: extracting the feature vector of the last time step output by the 1DCNN module in S3, linearly mapping it to the same dimension as the output feature of S4 through a fully connected layer, and then adding it element-wise with the output feature of S4 to achieve residual feature fusion; S6, prediction result output; S7, model training and optimization. By adopting a technical solution that combines the 1DCNN module with time-dimensional sliding convolution and ReLU nonlinear activation, the method accurately captures the local fluctuation features and short-term trend information of stock time series, solving the problems of insufficient characterization of short-term stock price changes and inability to effectively mine local time series patterns.

The utility model belongs to solenoid valve field especially possesses the high frequency response solenoid valve of anti -blocking self -cleaning function, to the existing solenoid valve when conveying the fluid containing impurity (such as tap water, industrial medium etc.), impurity is easy to accumulate in the valve body, lead to the valve core jam, sealing surface wear or flow reduction, influence solenoid valve's performance and life, traditional solenoid valve lacks effective anti -blocking and self -cleaning function, needs to frequently disassemble and wash, and the maintenance cost is high problem, present and propose following scheme, it includes solenoid valve main part and connecting pipe, the both ends of solenoid valve main part are import and export respectively, through processing mechanism can intercept the particulate matter in fluid, impurity, reduce the impurity from the source into solenoid valve main part inside, avoid the valve core jam, sealing surface wear or flow channel block, prolong the service life of solenoid valve, through the inlet pipe and the discharge pipe access external flushing water source, can reverse flushing to filter screen, carry out self -cleaning, need not to disassemble.

The utility model provides a kind of continuous casting furnace slag viscosity tester of easy feeding, belong to continuous casting furnace slag detection equipment technical field, for conveniently carrying out feeding operation.Its technical scheme is:it includes heating corundum pipe and high-temperature crucible, clamping seat is equipped in the upper end of heating corundum pipe, feed pipe is connected in clamping seat, the upper end of feed pipe is connected feeding hopper, and the lower end of feed pipe is opposite high-temperature crucible.The utility model is simple in structure, easy to use, when not needing feeding, high-temperature crucible is clamped into and clamped out, avoid high-temperature crucible temperature drop, shorten detection time, improve the safety performance of operation.

The invention discloses a severe environment unmanned aerial vehicle aerial photography target detection method based on multispectral iteration enhancement, and belongs to the technical field of computer vision. The method comprises the following steps: firstly, acquiring RGB pictures and infrared pictures in severe environments such as rain and fog, night and the like, and constructing a data set; then, an unmanned aerial vehicle aerial photography target detection model is constructed, and efficient deep fusion of visible light and infrared multispectral features is realized by introducing a novel iterative hierarchical attention and differential enhancement fusion framework; meanwhile, a tail enhancement unit of an HGBlock module in the backbone network is redesigned; then training an unmanned aerial vehicle aerial photography target detection model by using the data set; and finally, using the trained detection model to detect an aerial target of the unmanned aerial vehicle and evaluate the performance of the model. Through a fusion mode of combining interactive alignment, differential enhancement and iterative feedback, the target detection performance and real-time performance of the unmanned aerial vehicle under complex weather and illumination conditions are improved.

The utility model discloses a kind of film winding pressure roller structure, it is related to film winding technical field, including the pressure roller assembly of overhanging being arranged on winding shaft, the pressure roller assembly includes two groups of parallel arrangement mounting plate and the pressure roller of being arranged in the inboard of two mounting plates, and the rotary axis of pressure roller and the rotary axis of winding shaft is parallel state arrangement, to when winding film is wound on winding shaft, pressure roller is pressed to film with the resistance of towards winding shaft, and the effective resistance length of pressure roller is greater than the width of film.The utility model is designed by overhanging type pressure roller assembly, so that winding shaft and pressure roller axis parallel collimation layout, the design of the effective resistance length of pressure roller set exceeds film width, forms axial full coverage type line contact pressing interface, can inhibit edge stress relaxation phenomenon in winding process, guarantee the consistency of roll material end face neatness and interlayer tightness.