272results about How to "Will not affect test results" patented technology

The invention relates to an enzyme-linked immune analysis method and a fully-automatic enzyme-linked immune analyzer. The analyzer comprises a rack component, a washing component, a sample adding / reagent adding component, a heating and temperature control component, a fluid path system, an input and output device, an optical measurement component and a control system, wherein the rack component comprises a rack soleplate; a pillar is arranged on the rack soleplate; a lower fixed plate and an upper fixed plate are arranged on the pillar from bottom to top in sequence; a circular reaction plate is arranged between the lower fixed plate and the upper fixed plate; the circular reaction plate is connected with the upper fixed plate and the lower fixed plate through a central shaft; a first motor is fixedly arranged at the lower part of the lower fixed plate; and the first motor is used for driving the circular reaction plate to rotate through a first transmission mechanism. When in use, the enzyme-linked immune analysis method and the fully-automatic enzyme-linked immune analyzer can carry out the detection of corresponding projects without wasting reagent through only one sample; and detection reagents need not to be respectively contained in different reagent bottles, so that the operation is very convenient, and the operation error is not easily caused, thereby ensuring the accuracy of the detection results.

The invention discloses a blood collecting container, and particularly relates to a container for collecting nucleic acid preserved at normal temperature. The container comprises a collecting pipe and a rubber plug, wherein the rubber plug is sealed on a pipe orifice of the collecting pipe; a protective cap is arranged outside the rubber plug; an additive is arranged inside the collecting pipe; and the additive is prepared from a blood anticoagulant and a buffer solution thereof, an antiseptic fixative, a nuclease inhibitor, a metabolic inhibitor and a cell membrane stabilizer in a mixing manner. By adopting the container, the collected sample can be kept in an initial state for 7-14 days or even longer time at normal temperature, and does not decay, so that the detection result is not affected. The collecting container can be applied to collection, storage and transportation of a blood sample in a disaster, a war or a hard area, can be applied to collection, storage and transportation of other tissues, cells and the like in a scientific experiment, and also can be applied to other clinical inspection items. By adopting the container disclosed by the invention, the storage condition after the sample is collected is reduced. Thus, the labor of a worker is reduced, and the work efficiency is improved.

The invention discloses an earphone interface circuit and electronic equipment, relating to the technical field of electrons and solving the technical problem that the traditional earphone interface circuit can not accurately detect whether an earphone is in an inserting state or not when an audio signal is a non-biased voltage signal. The earphone interface circuit comprises a socket interface, an audio signal output pin, an audio input pin, a grounding pin, an elastic pin, an earphone state testing end, a power supply module and a control detection module, wherein the socket interface is connected with the grounding pin; when the earphone is inserted into the socket interface and in the inserting state, the grounding part of the earphone abuts against the socket interface; the power supply module is connected with the audio input pin and used for inputting electric energy to the audio input pin; and the control detection module is connected with the earphone state testing end and used for judging whether the earphone is in the inserting state or not according to the change of a level at the earphone state testing end. The electronic equipment comprises the earphone interface circuit. The invention is applied to the electronic equipment provided with the earphone interface circuit.

The invention discloses a road-vehicle fusion perception based early warning method against lane departure, and relates to the field of automatic driving. Firstly, a roadside sensing device collects and preprocesses images of lane lines and a vehicle; then, a driving track is stored; and meanwhile, lane line detection is conducted, the positions of the lane lines in the world coordinate system areobtained through inverse perspective transformation, similarly, the position of the target vehicle is unified to the world coordinate system, and distance information between the center point of thevehicle and the lane lines on the two sides is obtained. And multiple frames of driving track of the target vehicle are fit, and the yaw angle of the vehicle is calculated. And finally, a vehicle sensor acquires the steering wheel angle and steering lamp information of the vehicle, if the deviation driving of the vehicle is not the intention of a driver, speed and acceleration information of the vehicle is acquired and transmitted to a vehicle-mounted terminal, and the vehicle-mounted terminal judges whether the vehicle has the risk of deviating from the lane line according to measurement information. According to the invention, the data processing amount of the vehicle-mounted terminal is reduced, the accuracy and robustness of a detection system are improved, and the driving safety is ensured.

The invention provides a method for immunologically detecting an anti-SmD1 antibody IgG on the basis of an enzyme-linked immunosorbent assay principle and a reagent device , which relate to an analysis method used for enzyme-linked immunosorbent assay of the anti-SmD1 antibody IgG independently, individually and disposably, a reagent device and a matched reagent. In the method, a plurality of reagents required in the enzyme-linked immunosorbent assay of the anti-SmD1 antibody IgG can be contained in one analyzing device; and according to the method, relevant immunological tests can be conveniently conducted according to using requirements on the tested project, and better basis is provided for clinical practice.

The invention provides a method for realizing immunization detection for an anti-nucleosome antibody IgG (intravenous gamma globulin) based on the enzyme-linked immunoassay principle and a reagent device therefor; and an analytic method, the reagent device and an assorted reagent are independently, individually and disposably used for detecting the anti-nucleosome antibody IgG based on enzyme-linked immunoassay. Various reagents needed by enzyme-linked immunoassay for the anti-nucleosome antibody IgG are contained in one analytic device; and by using the method, the related immunology detection can be conveniently carried out according to the using requirements of detection items so as to provide better basis for clinical application.

A static multi-optical-path star simulator comprises a flange and at least four starlight pipes, wherein each starlight pipe can produce a simulation star, optical spectrum and brightness of each starlight pipe can be separately adjusted, the starlight pipes are installed on the flange by an angular adjustment mechanism, optical axles of two arbitrary star pipes are not parallel, relative angle between two arbitrary star pipes can be adjusted in a range not smaller than 10 degrees, a large amount of simulation constellations with different constructions can be produced, brightness and spectral characteristic of all asterions can be different, geometrical similarity between two arbitrary simulation constellations is relatively low, and physical characteristics of actual star field can be well simulated.

The invention provides a method for detecting the bottom outline of a contact plug, comprising the following steps of: providing a wafer, wherein the wafer comprises a semiconductor substrate with an active region, a first dielectric layer on the semiconductor substrate, the contact plug passing through the first dielectric layer and electrically connected with the active region, a second dielectric layer formed on the first dielectric layer and the contact plug, and a metal layer passing through the second dielectric layer and electrically connected with the contact plug; removing the metal layer and the second dielectric layer; removing a part of the first dielectric layer in a manner of dry etching; removing the contact plug so as to form a detection sample wafer; and using a scanning electron microscope to detect the detection sample wafer. In the invention, a clear picture of the bottom outline of the contact plug can be obtained by using the scanning electron microscope, and a precise detection result is obtained.

The invention provides a layer-2 network connectivity detecting method and associated equipment which are used for detecting connectivity of a first MAC (media access control) address and a second MAC address belonging to the same broadcast domain. The method comprises steps as follows: a controller sends a first MAC flow-table entry or data indicating generation of the first MAC flow-table entry to a first switch; the first MAC flow-table entry comprises a first matching item and a first action, the first action is used for indicating the first switch to be matched with a first message according to the first matching item and uploading the first message to the controller; the controller detects the connectivity of the first MAC address and the second MAC address according to the result of the judgment whether the first message is received in preset time. Accordingly, the connectivity of the first MAC address and the second MAC address belonging to the same broadcast domain can be detected through issuing of the flow-table entry without a complicated parameter configuration process, so that the workload is reduced.

The invention relates to cloth blanking equipment which comprises a machine frame and a clamping mechanism that is used for clamping cloth and includes a lower clamping plate, an upper clamping plate and a puller spring, wherein the lower clamping plate is fixedly arranged on the machine frame, the upper clamping plate is arranged over the lower clamping plate, and the upper clamping plate is arranged on the machine frame and can slide up and down; a cutting board is arranged over the upper clamping plate, the cutting board is arranged on the machine frame and can slide up and down, both ends of the puller spring are respectively fixed on the cutting board and the upper clamping plate; a knife group is arranged below the cutting board, the upper clamping plate is provided with a cutting hole, a charging hole is arranged on the lower clamping plate, the cutting hole and the charging hole are respectively arranged under each knife of the knife group, the cutting board is connected with a drive mechanism used for controlling the cutting board to lift up and down, and the drive mechanism is arranged on the machine frame. The cloth blanking equipment effectively prevents polluting the work environment and improves the reliability of the test results.

The present invention discloses an automatic testing method of a QT-based application program, and belongs to the software automatic testing field. For a QT application program, a QT event is intercepted and captured in a recording process, related information of the event is recorded, and to-be-tested information in an application program running process is saved. In a playback process, the event information recorded in the recording process is analyzed, a unique control is found by using attribute information of the control, the QT event is simulated, and is sent to an event queue for automatic running, and the to-be-tested information in the application program running process is saved. Finally, a difference of the to-be-tested information in the recording process and in the playback process is compared. According to the method provided in the present invention, recording and playback operations can be completed by only simply running the application program, the playback process is coordinate insensitive, and a test result is not affected by a position change of the control in an interface. Further, the method uses a unified and effective control identifying method, to reduce burden and an error probability caused by identifying different controls.

The invention provides a photon crystal gel material for detecting glucose, which comprises polyacrylamide-acrylic acid gel and a photon crystal embedded in the gel, wherein the gel is directly or indirectly chemically grafted with phenylboronic acid groups, and the photon crystal is two-dimensional photon crystal or three-dimensional photon crystal. The invention also provides a glucose detection method based on the photon crystal gel material, and the color information displayed after the photon crystal gel material detects a glucose solution is converted into glucose concentration information. The glucose detection method provided by the invention can qualitatively or quantitatively detect glucose concentration with high selectivity, sensitivity, convenience and visualization, and provide a novel non-invasive detection method for urine glucose monitoring of diabetics.

The invention belongs to the field of civil and structural engineering, and relates to a pull-out test device for bond-slip hysteretic behavior testing of a stiffening rib. The pull-out test device comprises a counter-force frame, a fastening steel plate, an upper clamping device and a pull-out test piece, wherein the counter-force frame is formed through fixed connection of a top plate, side plates and a bottom plate through bolts, and the counter-force frame is fixedly connected with a tester base through a connecting part; the fastening steel plate and the pull-out test piece are pressed through a bolt; the upper portion of a deformed steel bar shaft in the upper clamping device is in spiral connection with a load sensor of a tester, the lower portion of the deformed steel bar shaft is in spiral connection with the inner side of the upper portion of a steel sleeve and rotates in the thread direction to enable the steel sleeve to rise and fall, and the lower portion of the steel sleeve is connected with the end of the stiffening rib. The pull-out test device is simple in structure. During cycling load application, static balancing is maintained between the test piece and the counter-force frame, and relative displacement is avoided; the stiffening rib and concrete have the same stress state.

The invention discloses a method for qualitatively predicting the service life of a lithium ion battery using EIS test, comprising the steps of: firstly determining a solution of accelerating the aging of lithium ion battery, which is as follows: performing charging and discharging cycle on a battery cell under a temperature condition of 45 to 60 DEG C using a circulating mode of charging with 0.3to 2C and discharging with 0.3 to 2C; putting the battery cell into a constant temperature box of 35-42 DEG C for constant temperature treatment for 2 to 10 hours after the charging and discharging cycle; performing EIS test on the battery cell and collecting EIS data; fitting the EIS data with a Zview software, and making a changing curve that a Rct growth rate varies with a cycle number; and performing qualitative prediction on the service life of the lithium ion battery according to the changing curve. According to the method for qualitatively predicting the service life of a lithium ion battery using EIS test, the EIS test is a non-destructive test and does not affect the following test result; the prediction time is short; the adaptability is high, and deep research on the electrochemical reaction mechanism of the battery cell is not needed; and meanwhile, the method is high in accuracy, and the accuracy can reach90% or above.

The invention provides a device for testing outgassing rate of a material, and the device comprises a vacuum chamber, a pump group, a testing system and a gas source. The vacuum chamber comprises a first vacuum chamber and a second vacuum chamber, the first vacuum chamber and the second vacuum chamber are separated by a spaced baffle provided with small holes, the second vacuum chamber is used for placing the test material, and the second vacuum chamber is provided with a radiation lamp; the pump group is connected with the vacuum chamber; the testing system is connected with the vacuum chamber; and the second vacuum chamber is charged with the gas source. The device tests gas pressure in the first vacuum chamber and the second vacuum chamber by the testing system, the total outgassing rate of all gases released by the test material can be tested, and the outgassing rate of one certain gas component released by the test material can be tested.

The invention relates to a single-mold-cavity microwave thermogravimetric analysis system, belonging to the technical field of an analytical test device. The single-mold-cavity microwave thermogravimetric analysis system comprises an electric cabinet, a microwave source, a microwave reactor, a microwave transmission system, a PLC control system, a mass measurement system, a temperature measurement system and an atmosphere regulating system; the electric cabinet comprises a cabinet body standing on the ground, and a cabinet head arranged at the upper surface of one end of the cabinet body; the electric cabinet is used for supplying electric energy for a thermogravimetric analysis system body; the microwave source comprises a magnetron; the magnetron is arranged in the cabinet head; the microwave transmission system is used for transmitting microwaves generated by the magnetron into the microwave reactor; the upper end of the microwave reactor is provided with the temperature measurement system, and the lower end of the microwave reactor is provided with the mass measurement system; the microwave reactor is connected with the atmosphere regulating system. The microwave thermogravimetric analysis system is relatively reasonable in structure, relatively accurate in measurement and relatively convenient to operate and maintain, and is used for measuring the mass change of a big sample at high temperature and different atmospheres in a microwave heating way.

The invention discloses a quality control material of a chromosome aneuploid (T21, T18 and T13) detection kit. The quality control material comprises a positive reference material and a negative reference material. The positive reference material is a reference material set composed of a solution P21, a solution P18 and a solution P13, wherein the solution P21 is composed of solute and solvent, the solution P18 is composed of solute and solvent, the solution P13 is composed of solute and solvent, and the solvent of the solution P21, the solvent of the solution P18 and the solvent of the solution P13 are normal solutions. The normal solutions are in-vitro plasma of normal non-pregnant women of which the chromosome karyotype is 46, XX according to the analysis result. The solute of the solution P21 is PL21, the solute of the solution P18 is PL18, and the solute of the solution P13 is PL13. The quality control material is economical, simple and convenient to use and effectively achieves quality verification and performance evaluation of the chromosome aneuploid (T21, T18 and T13) detection kit.

The invention relates to a loading mechanism of a mute life testing machine of a rolling bearing. The loading mechanism comprises a sliding plate, a base, a front guide block, a rear guide block, a loading rod, a loading spring, a feeding mechanism, a fastening screw, a load column and a load disc, wherein the base is used for supporting the sliding plate to slide; the front guide plate and the rear guide plate are fixed on the sliding plate; the loading rod penetrates through the front guide block and the rear guide block; the loading spring is sleeved on the loading rod; the feeding mechanism which is used for driving the sliding plate to move axially along the loading rod; the fastening screw is used for fastening an axial position of the sliding plate; the load column is used for propping against an end face of an outer ring of the rolling bearing to be tested; the load disc is used for connecting the loading rod with the load column; a preloading nut is in thread connection at the middle part of the loading rod; the loading spring is propped between the preloading nut and the rear guide block; a front end of the loading rod props against a rear end of the load disc; and a front end of the load disc is used for propping against the end face of the outer ring of the rolling bearing to be tested through the load column. The loading mechanism has the advantages that: the mute life testing machine of the rolling bearing is stable and reliable in testing load, the load has a function of self-aligning, and the end face of the outer ring of the rolling bearing to be tested is uniformly loaded without unbalance loading.

The invention relates to a detection system and a detection method of a base band digital video frame rate. The system comprises a video frame rate detection card, a video quality assessment analyzerand a tested video camera, wherein the video frame rate detection card comprises a dial plate, a pointer which is driven by a motor to rotate at a constant seed is arranged on the dial plate, long scale lines are arranged on the dial plate every five degrees, and short scale lines are arranged on the dial plate every one degree; the video frame rate detection card also comprises a detection stripand an image positioning point used for automatically finding dial plate and pointer positions when image recognition is performing, wherein the detection strip is composed of multiple pieces of colors with different gray levels; the video frame rate detection card is a real image card, generates a continuous movement image, provides a continuous video source for the tested video camera, and transmits data to the video quality assessment analyzer through imaging of the video camera, sampling and coding. The detection method provided by the invention adopts the detection system of the base banddigital video frame rate for detecting.

The invention provides a ground testing system for flight performance of an unmanned aerial vehicle. The ground testing system comprises a two-axis rotating platform testing device and a performance measuring device connected with the two-axis rotating platform testing device. The two-axis rotating platform testing device comprises a rotating platform control mechanism and a rotating platform mechanism connected with the rotating platform control mechanism; the rotating platform mechanism is used for driving an unmanned rotorcraft, and the rotating platform control mechanism is used for controlling the unmanned rotorcraft; the performance measuring device comprises an unmanned aerial vehicle information measuring sensor and a data acquisition analysis device; the unmanned aerial vehicle information measuring sensor is arranged on the unmanned rotorcraft; and the data acquisition analysis device is connected with the unmanned aerial vehicle information measuring sensor. According to theground testing system for flight performance of the unmanned aerial vehicle, provided by the invention, aiming at the testing platform designed aiming at the small unmanned rotorcraft, the system issimple, and the production cost is low.

The invention belongs to the field of organic micromolecule fluorescent probes, and relates to a near-infrared fluorescent probe for identifying hydrogen sulfide as well as a preparation method and application thereof; and the fluorescent probe has a structure as shown in a formula I, is a near-infrared probe, has good biological tissue permeability, high sensitivity, high selectivity and low cytotoxicity, can prevent interference from biological macromolecular background fluorescence, can be used for detecting endogenous hydrogen sulfide of living cells and has a wide application prospect.

The invention discloses a method for measuring Jardiance and related substances of Jardiance through separation. According to the method, gradient elution are performed by adopting high performance liquid chromatography, utilizing octyl silane bonded silica gel filler or phenyl silane bonded silica gel filler as a chromatographic column and adopting a moving phase formed by a phosphoric acid solution, methyl alcohol and acetonitrile. With the adoption of the method, Jardiance and related substances of Jardiance can be separated very well, the detection is good in reproducibility, high in sensitivity and specificity and simple to operate, and control for quality and medication safety of Jardiance is facilitated.

The invention discloses a power testing apparatus for a small-power motor and the apparatus has power loss-free and wide measuring range properties. According to the invention, a front supporting seat is fixed on an active plate; a half axle is supported on the front supporting seat by a bearing; a moment rod is fixed on the axle body of the half axle; and a lower end of the moment rod is inserted into a testing position of a torque sensor. A rear end of the half axle and a center of a front end of a frame are fixed to each other; a rear end of the frame is fixed on an installation disk; a power shaft is arranged on the rear of the installation disk and is connected with a rear supporting seat through a bearing; the power shaft is connected with an input shaft of a dynamometer directly or by a speed change mechanism; and a rotating speed sensor is installed on the power shaft. According to the invention, a principle of a moment balance equation of Newton's third law is employed, wherein the equation is characterized in that sigma M is equal to an absolute value of-M, so that an equal corresponding relationship between a turning moment output by an output shaft of the motor and a counter turning moment that a housing of the motor is subjected to is obtained. And then the static counter torque, which is measured, is a torque output by the motor. The testing apparatus is free of losses and has a wide range; besides, an actual parameter value of the motor can be accurately tested by utilizing the testing apparatus.

The invention aims at providing a muscle disease monitoring method based on multi-channel surface electromyography (sEMG). The method comprises the steps that preprocessing is conducted on multi-channel sEMG signals firstly, a first channel is selected as a reference, and differencing is conducted on the signals of other channels and the signal of the first channel; then distribution moments are extracted through a K-means clustering convolution kernel compensation (KMCKC) method, and a single waveform is extracted; finally, multiple features of the waveform are fused, and the muscle state is evaluated. Due to the fact that external interference has influence on all electrodes, by meas of differencing between the signal of the first channel and the sEMG signals of original multiple channels, the external interference is effectively reduced, subsequent detection results cannot be affected, and the accuracy of muscle detection is improved. By means of application of the multi-feature parameters, the instability of single-parameter monitoring is effectively avoided, and the monitoring robustness is promoted. By means of the muscle disease monitoring method based on the multi-channel surface electromyography (sEMG), the defects in the prior art are effectively overcome, and important application value is achieved.

The device consists of multiple immediate static electricity detector, an OR-logic circuit and a general actuator as immediate static electricity detector is equipped with a RC-oscillator, pulse width regulation controller, voltage comparator, driving amplifier and personal warner. The automatic immediate static electricity warning device can check out at any time whether static electricity collection component is accessorized on operator at each production line or not and it can launch alarm in both modes of sound and light if it finds that something is wrong.

The invention discloses an automatic detection method and system for a point switch notch and a storage medium, and the method enables a template matching algorithm and a gray integral projection algorithm to be applied to the real-time detection of the notch, and achieves the accurate and visual detection of a notch value through the analysis of a real-time photographed point switch notch image or a real-time photographed point switch notch video. Actual tests show that the algorithm used in the invention is suitable for point switch notch detection, the change of the illumination intensity in the image acquisition process does not influence the detection result, and the noise existing in the acquired image does not influence the extraction of the notch detection line, so the algorithm has strong robustness. Starting from the algorithm, the reference line of the gap detection adopts an automatic identification mode, and does not need to be manually delimited; according to the invention, the problem that reference lines need to be manually delimited at the notch fixing ends of a plurality of point switches respectively is solved, the calibration work which must be performed due toinaccurate manual reference line delimiting is avoided, the actual working efficiency is greatly improved, and the intelligent level of notch detection is improved.

The invention gives a monitoring device for conducting real-time monitoring of the power cable status, which comprises a transmitter and a receiver. The transmitter is provided with a transmission transformer harnessed on the power cable. The invention also gives the method for monitoring the power cable status by the power cable monitoring device. By utilizing the method, the security system can be established to realize the real-time monitoring and automatic alarming and the cable inquiring and finding without the change of the operation mode of the circuitry and the power cut, which is easy to install and operate and applicable to various monitoring of cable with shield and restrictive coating.

The invention discloses an unmanned aerial vehicle spray span and spray effect detection method. The method comprises the following steps: S1, a solution A and a solution B are acquired respectively,and when the solution A and the solution B are mixed, color change happens; S2, the solution A is attached to test paper, and the test paper is dried; S3, the test paper is fixed in a test area; S4, the solution B is contained in an unmanned aerial vehicle medicine chest; S5, the unmanned aerial vehicle flies in the test area at a fixed speed in a fixed height and sprays the solution B; and S6, the information of a color changing point on the test paper is acquired, the information of the color changing point is analyzed and processed to generate spray span parameters and spray effect parameters. The unmanned aerial vehicle spray span and spray effect detection method and the operation method have the beneficial effects that the detection cost can be reduced; the detection efficiency is improved; and the corresponding spray span parameters and the spray effect parameters are generated.

The invention discloses a device for measuring anti-leaking and leaking-blocking performance of gel under a complex stratum and an application method of the device. The device comprises an experimentcup, the experiment cup comprises a cup body, a base and a cap, and the base and the cap are fixedly connected with the cup body. The cap comprises a first cap body and a second cap body, a scaleplatehole and a pressure injection hole are formed in the first cap body, and a scaleplate is inserted into the scaleplate hole. A piston is connected to the lower end of the scaleplate and mounted in thecup body, an oil pipe hole and a water outlet hole are formed in the second cap body, and a simulated oil pipe capable of vertically freely moving is arranged in the oil pipe hole. A hollow cylindrical boss is arranged on the base, a clamping cylinder is mounted in the hollow cylindrical boss, and a liquid guiding hole is formed in the bottom of the hollow cylindrical boss and providedwith a plug. A filtering net is laid on the liquid guiding hole, a pit matched with the hollow cylindrical boss is formed in the lower end of the cup body, and the cup body is inserted in the hollow cylindricalboss. By adopting the testing device of the structure, the technological problem that as for an existing experiment device, rock cores need to be manually drilled and are prone to being broken can beeffectively solved.

The invention discloses a wireless-power type termite detection system comprising a first circuit board and a second circuit board. The first circuit board arranged on a termite detection device consists of a first single-chip microcomputer, a wireless receiving circuit, a wireless power supply circuit and a fixed power supply. The second circuit board arranged on a single termite detection body includes a second single-chip microcomputer, a detecting circuit, a wireless transmitting circuit and a wireless power-receiving circuit. The wireless power supply circuit and a wireless power-receiving circuit are connected wirelessly. The wireless power supply circuit is used for providing power for the first single-chip microcomputer, the wireless receiving circuit, and the second circuit board; and the wireless receiving circuit is used for receiving a signal transmitted by the wireless transmitting circuit. According to the wireless-power type termite detection system, the circuit board with the single termite detection body is not electrified when no detection is carried out; and when detection needs to be carried out, the circuit board is powered wirelessly. The application range is wide and the service life is long.