45results about How to "Adjust sharpness" patented technology

The invention discloses a projection device and an automatic focusing method, and belongs to the technical field of projection display. The projection device is designed for solving the problem that the focal distance of a projection lens group needs to be adjusted by a user manually in the prior art. The projection device comprises a processing unit, a projection unit, a projection lens group and a projection lens driving unit. The processing unit is respectively connected with the projection unit and the projection lens driving unit; the projection device further comprises an image acquiring unit which is connected with the processing unit; and at least three laser emitters are arranged around the image acquiring unit.

The invention provides a camera module. The camera module comprises a camera lens, a motor, a light-sensitive chip and a compensation circuit connected with the light-sensitive chip, wherein the camera lens comprises a lens cone and a lens body fixed to the inside of the lens cone; the motor allows the camera lens to be embedded and can drive the camera lens to move so that focusing of the camera module can be achieved; the light-sensitive chip is used for capturing light rays entering the camera lens and enabling a picture to be formed, and the compensation circuit is used for analyzing the picture and compensating the picture by means of an edge image so that sharpness of the picture can be adjusted; a fixing strip is arranged on the outside of the camera lens, and the camera lens can be movably embedded in the inner side or the surface of a sleeve of the motor through the fixing strip so that inclination of the camera lens and the sharpness of the picture can be adjusted. According to the camera module, the camera lens inclination adjustment mode is easy and convenient to achieve, cost is low and accordingly wide application of the camera module is facilitated.

The invention provides an electronic device and a method for displaying a video when an incoming call comes, the electronic device comprises a screen, and the method comprises the following steps: receiving a first incoming call request; displaying a first incoming call display interface on the screen according to the first incoming call request, and playing a first video in the first incoming call display interface; receiving a second incoming call request; displaying a second incoming call display interface on the screen according to the second incoming call request, and playing a second video in the second incoming call display interface; wherein the first incoming call request and the second incoming call request are two call requests continuously received by the electronic device; wherein the first video is different from the second video. According to the method for displaying the video by the electronic equipment when the incoming call comes, the user experience when the incoming call comes can be improved.

The invention provides an image display method and a mobile terminal. The method comprises the steps that a front-facing camera is started to acquire an eye image of a user in real time; the current distance between the eyes of the user and a screen is determined according to the eye image; the definition of an original image displayed on the screen is adjusted on the basis of the current distanceand a preset user vision parameter; and the image obtained after adjusting replaces the original image to be displayed on the screen. The definition of the image can be adjusted when a myopia or hyperopia user uses a mobile phone with the naked eyes, and therefore the use motivation and efficiency of the user are improved.

The invention discloses an intelligent calligraphy copy table which is used for calligraphy and painting copy learning. The intelligent calligraphy copy table comprises a copy platform, a projection mechanism, a focusing mechanism, a reflection mechanism, a screen showing / hiding mechanism and a control computer, and is characterized in that a lens of the projection mechanism is installed above a suspending plate in a mode of being back to the copy platform; the focusing mechanism is installed below the projection mechanism in a mode of being capable of moving up and down so as to adjust the projection focal length; the reflection mechanism is installed above the focusing mechanism in a mode of being capable of adjusting a projection reflection angle in four dimensions such as front, back, left and right; and the screen showing / hiding mechanism is installed between the projection mechanism and the reflection mechanism so as to shield or allow projection light given out by a projector to pass. The computer of the intelligent calligraphy copy table is connected to the projector, so that a lot of copybooks can be stored and used; the projection mechanism can be installed in a small space below the copy table top; the angle of the projection mechanism relative to the reflection mechanism can be adjusted; and the font size and the definition of a projection copybook can be adjusted simply and conveniently, and the copy effect is improved. The intelligent calligraphy copy table is simple in structure, convenient, practical and complete in function.

The invention provides a license plate identification control system. The license plate identification control system comprises a license plate identification device, a control device and a blocking device. The license plate identification device identifies license plate information which is connected to the control device. The control device controls motions of the blocking device according to the license plate information. The invention also provides a vehicle identification control method. The vehicle identification control method comprises following steps of: (A) carrying out light supplementation to shoot image information; (B) snapshootting a target image; (C) analyzing the target image; and (D) controlling vehicles to pass according to the analysis result.

The invention provides a projection adjusting system and a projection adjusting method thereof. The projection adjusting system comprises an illumination module, a projection module and an iris diaphragm control module, and the illumination module projects light carrying imaging information. The projection module obtains light rays carrying imaging information and projects the light rays outwardsto a projection surface, the iris diaphragm control module comprises at least one iris diaphragm and a controller, and each iris diaphragm adjusts the aperture of at least one diaphragm under the control of the controller. The light intensity of the light projected outwards is adjusted by zooming the aperture of the diaphragm.

The invention relates to a full-automatic nail polishing machine which comprises a vibration disc feeder, a horizontal nail polishing machine tool body and a vertical nail polishing machine tool body, wherein a front panel is arranged on the vertical nail polishing machine tool body; an automatic nail arranging distributor, a transmission screw rod and a transmission motor are fixed on the front panel; the automatic nail arranging distributor is connected with a discharging port of the vibration disc feeder; a discharging port of the automatic nail arranging distributor is propped against the outer thread at one end of the transmission screw rod; a discharging port is formed in the other end of the transmission screw rod; a grinding wheel and a grinding wheel transmission motor are fixed on the horizontal nail polishing machine tool body; a polishing port is formed in the vertical nail polishing machine tool body and below the transmission screw rod; the polishing surface of the grinding wheel extends into the polishing port. The full-automatic nail polishing machine is convenient to operate, and during the operation, the nails to be polished are put in the vibration disc feeder and then starting is carried out on the polishing machine, so that the labor intensity of manual emptying and polishing is decreased, the polishing efficiency is improved, the harm from the dust to the operators is avoided, the approximately same length and shape of the polished nails are realized, and the polishing quality is improved.

The invention discloses a projection apparatus and electronic equipment. The projection apparatus comprises a projection module and a lens module; the lens module comprises an optical lens group and a reflector; and light source information emitted from the projection module incidents to the reflector through the optical lens group to be reflected by the reflector and then to be projected to a preset screen plane to form an image, wherein the reflector is used for reflecting the incident light source information to the preset screen plane. According to the technical scheme disclosed in the invention, the optical distance from the light source information emitted from the projection module to the preset screen plane can be increased though the reflection effect of the reflector, so as to further realize image display of relative large dimensions; and meanwhile, by setting the reflection position of the reflector, the optical distance increasing proportion can be set, so that the dimension of the displayed image can be greatly enlarged, and projection of the displayed image with large dimensions can be realized within a relatively small space.

The invention provides a video definition adjusting method and system, a computer readable storage medium and a terminal. The video definition adjusting method comprises the following steps: S100, controlling a terminal to play a video; S200, detecting a network connection state of the terminal, wherein the network connection state comprises a network connection mode and / or a network connection rate; and S300, playing the video at the video definition corresponding to the network connection state of the terminal according to different network connection states and based on a preset corresponding relationship between the network connection states and the video definition. After the technical scheme is adopted, the definition most suitable for the current environment can be automatically selected for the user based on the selection of the user and the state of the terminal when the video is played on the basis of guaranteeing the watching habit of the user when the user watches the video.

The invention discloses high-imitation electroplating bonding silver powder paint which comprises the following components in parts by weight: 80-90 parts of terminal carboxyl group polyester resin, 6-8 parts of isocyanate triglycidyl ester, 10-15 parts of organic silicon resin, 5-10 pars of terpene resin, 1-3 parts of polyacrylate, 0.3-0.7 part of benzoin, 0.5-1 part of a fluorescent whitening agent, 1-2 parts of a bonding aid and 0.6-1 part of coating type aluminum powder. The invention further provides a preparation method of the high-imitation electroplating bonding silver powder paint. The preparation method comprises the following steps: weighing and blending materials, premixing the materials, performing melting extrusion, grinding, bonding, screening, and packaging a finished product, thereby obtaining the high-imitation electroplating bonding silver powder paint. By adopting the high-imitation electroplating bonding silver powder paint and the preparation method thereof, effects of high smoothness, high clarity, high brightness and high leveling properties of an electroplated surface are achieved by adjusting the melting viscosity, clarity, surface tension, glass transition temperature, bonding temperature, bonding time, bonding speed and powder flowability of a formula.

The invention discloses a video recording tool based on an Android system. The tool is used as follows: carrying out initialization setting of a video recording tool, and setting recording parametersof the video recording tool; obtaining a resolution list supported by a mobile phone camera, and selecting a maximum resolution or a moderate resolution supported by the mobile phone; starting automatic focusing to enable a video interface to keep a set resolution and starting a preview interface; monitoring the rotation change and resetting the rotation angle of the camera; setting a start buttonand a delete button to be in a non-operable state, setting a stop button to be in an operable state, initializing a timer and starting timing; when the video recording meets the requirement, stoppingrecording, and stopping timing; and after finishing of the recording, resetting the recording state and returning to the file recording path. The video recording tool has the following beneficial effects: the duration and a video direction can be specified by using mobile phone recording; adjustment of video definition and automatic focusing can be realized; and automatic rotation of a video along with the gravity induction is also realized.

The embodiment of the invention discloses a video processing method and a related product thereof, which are applied to first front-end sensing equipment of a doorbell video processing system. The method comprises the following steps: acquiring a first image; determining at least one reference image area of the first image, wherein the reference image area comprises image information of at least one of a portrait, a hand action, a limb action and an object; adjusting the definition of each reference image region in the at least one reference image region, and adjusting the definition of imageregions except the at least one reference image region in the first image to obtain an adjusted first image; and sending the adjusted image information to a first terminal device. According to the method, the definition of the reference image area and the definition of the image area, except the reference image area, of the first image are adjusted by intercepting the reference image area, the data storage and processing pressure of the doorbell processor is reduced, and the data storage and processing efficiency and reliability of the gesture doorbell processor are improved.

The invention belongs to the technical field of learning tools, and particularly relates to a sitting posture correcting, projection and touch control integrated mechanism. The sitting posture correcting, projection and touch control integrated mechanism comprises a desktop bookshelf; a desktop bookshelf bottom vertical plate is arranged at the bottom of the desktop bookshelf, and air cylinders are arranged at the bottoms of the two sides of a paper inserting groove; the output ends of the air cylinders are connected with paper pressing strips which are located in the paper inserting groove; and the desktop bookshelf bottom vertical plate is provided with an infrared camera. The sitting posture correcting, projection and touch control integrated mechanism has the beneficial effects that the functions of projection, touch control, drawing and writing are achieved, meanwhile the sitting postures of students can be monitored in real time, and thus the effects of sitting posture remindingand correcting are achieved; and meanwhile, projection can be clearer, interference of the desktop grain is avoided, writing can be conducted on a desktop according to a projected picture, and the desktop is not damaged.

The present invention discloses an electrical device. The electrical device comprises: a supporting arm, a base portion connected to one end of the supporting arm, and a head portion connected to the other end of the supporting arm, wherein the head portion comprises a projector which is fixed to the head portion by a projector bracket and is at least used for carrying out projection on a first region of a placed plane of the base portion, and a roller which is connected with the projector and is used to adjust an image projected by the projector; and a first portion of the roller is exposed on a first outer surface of a housing of the head portion. By applying the technical scheme of the present invention, at least the problem of inconvenience for adjusting the projector in the prior art can be solved, and the usage experience of a user is promoted.

The invention belongs to the technical field of medical apparatuses and instruments and provides a nerve-blocking puncture catheter needle with an adjustable puncture head. The catheter needle mainly consists of a puncture catheter and a puncture needle core. During operation, the puncture needle core is sleeved by the puncture catheter, and the sharp end of the puncture needle core extends out of a port of the puncture catheter and has sharpness. Under the ultrasonic guidance, the sharp end of the puncture needle core can return to the puncture catheter through adjustment and control when the catheter is close to the target nerve, and the catheter needle loses the sharpness but still has toughness and can continue to penetrate the fascia tissue to be close to the nerve till the catheter needle touches the nerve. Due to the fact that a needle point returns back to the catheter and loses the sharpness, the nerve is not hurt, the catheter needle reaches a target position, the puncture needle core can be directly removed, and the puncture catheter is indwelt around the nerve for future anesthesia medicine application or anesthesia analgesia treatment and other applications.

The invention discloses a water treatment and air source heat pump detection display system. The water treatment and air source heat pump detection display system includes a control module, the control module is electrically connected with a power supply, a wireless receiving module, a storage module, an auxiliary interaction module and an LED display screen. The wireless receiving module is connected with a wireless sending module through wireless transmission, the wireless sending module is electrically connected with a detection module, and the control module internally comprises a receiving unit, an image processing module, an adjusting module, a driving module and a flash memory unit. According to the invention, signal transmission is carried out through wireless transmission, signalsare progressively transmitted to the image processing module through the receiving unit, and the adjusting module is used for adjusting the definition of images or other various data; the air sourceheat pump is detected through the detection module, the power supply module is arranged so that the voltage can adapt to the control module for use, the flash memory and the storage module are arranged so that data displayed by the display screen can be stored and recorded, and data loss is prevented.

The invention discloses a zoom optical system with high resolution, small distortion, small volume and large image surface. The zoom optical system is characterized in that a photosensitive chip converting light rays into electrical signals is included, a first lens group, a third lens group and a fifth lens group which can be fixed relative to the photosensitive chip are arranged on one side of the photosensitive chip, a fourth lens group which can move relative to the photosensitive chip is arranged between the third lens group and the fifth lens group, and a second lens group is arranged between the first lens group and the third lens group; and the first lens group has a positive focal length, the third lens group has a positive focal length, the fourth lens group has a positive focallength, the second lens group and the fifth lens group have negative focal lengths, and an aperture controlling the amount of light beams entering the lenses is arranged between the second lens groupand the third lens group. According to the zoom optical system with high resolution, small distortion, small volume and large image surface, the lens transmittance is high, the zoom optical system canbe used in a variety of environments, the imaging effect is good, and the whole picture is clear in the presence of a plurality of bands.

The invention provides a sharpening blade and a sharpener with a detachable sharpening blade manufactured by the blade. The sharpening blade is characterized in that four seamed edges are equal in length, and bulges or sags for fixing are arranged at two ends of the sharpening blade. The sharpener comprises the sharpening blade, a sharpening blade fixing device and a sharpening knife holder, wherein a sharpening blade fixing groove is directly formed in the sharpening knife holder or is formed through a sharpening blade support. The sharpening blade is detachably arranged in the sharpening blade fixing groove. The sharpening blade support is axially connected to the sharpening knife holder; and two same sharpening blade assemblies are arranged on the sharpening knife holder in a way of being crossed in an approximate 'X' shape so as to form a 'V'-shaped sharpening knife port. Handrail parts and the sharpening blade assemblies on the sharpening knife holder are symmetric with regard toone same center shaft. The sharpening blade and the sharpener with the sharpening blade provided by the invention has the beneficial effects that the sharpening blade is easy to disassemble, assembleand replace; the four seamed edges can be used for sharpening a knife, so that the utilization rate of the sharpening blade is improved; and with the symmetric structure, knife sharpening can be carried out on two sides, and the sharpening blade assemblies are elastically connected, so that the knife sharpening angle can be changed, and a cutting edge is smooth.

A manufacturing method of a spectacle lens improving a manufacturing yield and a production efficiency is provided. The manufacturing method of the spectacle lens in which necessary information for a frame machining of a spectacle lens (progressive-power lens 20) including spectacle rim related information is obtained, and both surfaces of a convex surface and a concave surface are edge / polish machined from a spectacle lens blanks. When the convex surface or the concave surface is polish machined, and thereafter, the next surface is machined, the spectacle rim related information and layout information of the edge machining are obtained, and first provisional reference position marks 1 to 3 and second provisional reference position marks 4 to 6 guiding a geometrical horizontal reference and a geometrical perpendicular reference of the lens are inscribed at positions outside of an edge shape 111 as identification marks for the machined surface being polished as a provisional reference marking process, an optical layout is performed for the surface to be machined next based on these provisional reference position marks to perform a lens block to a lens machining tool.

The invention discloses an adaptive dimming belt foreign matter detection method and system based on fuzzy PID. The system comprises an LED three-color illuminance module, a fuzzy PID adjustment illuminance module, an image gray processing module, an image acquisition module, a foreign matter detection hardware module, a foreign matter deep learning detection model module and a segmentation and sorting processing module. In consideration of the influence of a light source on image definition during image acquisition and a complex downhole environment, the illuminance of the light source is adjusted through fuzzy PID, the image definition is adjusted, a high-definition image input is ensured, the acquired image is input into a yolo-based deep learning detection model, and the recognized foreign matter image is segmented and recognized so that the precision of belt foreign matter recognition is effectively improved. By using the technical means of segmenting the image, the surface area of the belt foreign matter is calculated, so that the automation level of belt foreign matter sorting and fully mechanized caving face is improved, the labor intensity of workers is reduced, and the foreign matter sorting accuracy is ensured.

The invention discloses a zoom lens. The zoom lens comprises a photosensitive chip, and one side of the photosensitive chip is provided with a first lens group and a third lens group which can be fixed relative to the photosensitive chip; the third lens group is disposed between the first lens group and the photosensitive chip; a fourth lens group movable relative to the photosensitive chip is arranged between the third lens group and the photosensitive chip; a second lens group is disposed between the first lens group and the third lens group to gradually approach the third lens group when the lens is focused from a short focal length to a long focal length; and between the second lens group and the third lens group, an aperture capable of control the amount of light beams entering the lens is provided. The focal length of the first lens group is positive, the focal length of the second lens group is negative, the focal length of the third lens group is positive, and the focal lengthof the fourth lens group is positive. The third lens group comprises an aspheric lens surface, and the fourth lens group comprises an aspheric lens surface. The lens of the invention has high transmittance, good imaging effect, high resolution, small distortion, small volume, large image plane and infrared confocal.

The invention discloses a universal cellphone lens, and the lens comprises an objective lens assembly, a sleeve, a prims assembly, a housing assembly, an adjustment groove, and an ocular lens assembly. The sleeve comprises a first sleeve and a second sleeve, which are hinged to the outside of the housing assembly. The objective lens assembly and the ocular lens assembly are installed in the housing assembly, and the prism assembly is installed in the housing assembly. Moreover, the prism assembly is located between the objective lens assembly and the ocular lens assembly. The adjustment groove is disposed outside the housing assembly, and the interior of the first sleeve and the interior of the second sleeve are respectively provided with a sleeve trench, wherein the sleeve trenches cooperate with the adjustment groove for use. The ocular lens assembly is provided with a staple bolt. The objective lens assembly and the ocular lens assembly are enabled to move back and forth through the rotating of the first and second sleeves, and the distance between the ocular lens assembly and a cellphone lens can be changed, so as to adapt to cellphones with different brands. The lens is good in universality, and can be used for many cellphones, and there is no need of a dedicated lens even if a cellphone is replaced in future.

The invention discloses a bladder tumor en-block whole-block excision device based on a resectoscope, and relates to the technical field of medical instruments, and the technical scheme is characterized in that the bladder tumor en-block whole-block excision device comprises a control box body, and an observation device, an electric control device, a water volume adjusting device and a tumor supporting device are arranged in the control box body; the water volume adjusting device comprises a water inlet adjusting valve, a water outlet adjusting valve, a water inlet pipe, a water outlet pipe, an annular collecting bin and a separating device. According to the resectoscope bladder tumor en-block whole-block excision device, normal saline can be injected into the bladder through the water volume adjusting device, so that the bladder filling degree is maintained for a long time under the condition that the view field is not affected; meanwhile, the device pulls the tumor through the tumor supporting device, and the effect of continuously manufacturing adjustable tension is achieved; and in addition, by arranging the annular collecting bin and the separating device, real-time collection of target excision tissue can be achieved.

A focusing mechanism, including a positioning seat, a focus ring, a lens, and a knob is provided. The lens has an optical axis. The positioning seat has a first surface, a second surface opposite to the first surface, and a sliding groove penetrating the first surface and the second surface. The focus ring is slidably and rotatably disposed on the second surface of the positioning seat. The lens is fixed to the focus ring. The focus ring has a positioning hole and is located between the positioning seat and the lens. The positioning hole is aligned to the sliding groove in a direction perpendicular to the optical axis. The knob passes through the sliding groove and is inserted into the positioning hole. The knob is pressed against the first surface of the positioning seat. A projection device is also provided.

The invention discloses an image capture device, and relates to the technical field of images. The image capture device comprises a base, and a driving mechanism is arranged at the back of the base; and the output end of the driving mechanism is fixedly connected with a rotating shaft through a coupling, and the end, far away from the driving mechanism, of the rotating shaft penetrates through thebase, and is fixedly connected with a rotating table. According to the image capture device, through improvement of a camera device and a detection device, as well as cooperative application of the driving mechanism and the rotating shaft, the horizontal state of a camera body is regulated by adopting electric signals directly, and the situation that the camera body is in the non-horizontal stateand consequently the level degree of shot images is not high is avoided; the difficulty in camera operation is reduced, and meanwhile the definition of the camera and the protection degree of a camera lens can be properly regulated according to the actual conditions (the higher the protection degree of the camera lens is, the poorer the light rays of the camera lens is, and consequently the lowerthe definition of the camera shooting is.).

The invention relates to a full-automatic nail polishing machine which comprises a vibration disc feeder, a horizontal nail polishing machine tool body and a vertical nail polishing machine tool body, wherein a front panel is arranged on the vertical nail polishing machine tool body; an automatic nail arranging distributor, a transmission screw rod and a transmission motor are fixed on the front panel; the automatic nail arranging distributor is connected with a discharging port of the vibration disc feeder; a discharging port of the automatic nail arranging distributor is propped against the outer thread at one end of the transmission screw rod; a discharging port is formed in the other end of the transmission screw rod; a grinding wheel and a grinding wheel transmission motor are fixed on the horizontal nail polishing machine tool body; a polishing port is formed in the vertical nail polishing machine tool body and below the transmission screw rod; the polishing surface of the grinding wheel extends into the polishing port. The full-automatic nail polishing machine is convenient to operate, and during the operation, the nails to be polished are put in the vibration disc feeder and then starting is carried out on the polishing machine, so that the labor intensity of manual emptying and polishing is decreased, the polishing efficiency is improved, the harm from the dust to the operators is avoided, the approximately same length and shape of the polished nails are realized, and the polishing quality is improved.

A photosensitive assembly, comprising a filter film and a light sensing circuit, wherein the light sensing circuit receives an optical signal that penetrates through the filter film; the filter film comprises a liquid crystal structure, wherein the liquid crystal structure comprises liquid crystal, the liquid crystal constitutes a light portion and a light shielding portion of the filter film according to different liquid crystal deflection angles, and a light transmitting portion is spaced apart from the light shielding portion. In the present invention, by using liquid crystal as a material of the light shielding portion of the filter film, the rotation angle of liquid crystal can be changed according to requirements, an all-phase image can be obtained, and the captured range is larger. Moreover, the shape of the light shielding portion can be adjusted according to requirements, and the sharpness of an obtained picture can be adjusted, and an image can be acquired more flexibly.

The invention discloses a laser therapy apparatus with a zooming collimation handle, belonging to the technical field of laser therapy apparatuses. The laser therapy apparatus comprises a laser therapy apparatus body and a fixing body, wherein the fixing body is located at the bottom of the laser therapy apparatus body, a protective shell is fixed to one end of the laser therapy apparatus body, a laser handle is arranged in the protective shell and connected with the laser therapy apparatus body through a connecting hose, one end of the laser handle is rotationally connected with a fixed shell, the other end in the fixed shell is in threaded connection with an irradiation head, and a second convex lens is fixed in the irradiation head. Through cooperation of a clamping block, a spring, a first convex lens and a second convex lens, the laser therapy apparatus can adjust the definition of the irradiation part of the laser handle through rotation of the fixed shell during use; and through cooperation of a sealing iron cover, the protective shell, a buffer pad and a placement groove, the laser therapy apparatus can better protect the laser handle during use.

The invention discloses a CT (Computed Tomography) device for a hospital. The CT device comprises a base and a supporting plate fixed on the base, wherein a showing stand capable of sliding up and down is arranged at the front end of the supporting plate; a lifting block is fixedly arranged in the middle of the rear end surface, close to the bottom position, of the showing stand; a lifting slidinggroove extending vertially and connected with the lifting block in a sliding-matching manner is arranged on the front end surface of the supporting plate. The CT device disclosed by the invention hasthe beneficial effects that the showing need for placing two CT scanning photographs of a patient can be met, the switching operation between the two CT scanning photographs can be realized by automatic control, a doctor can conveniently watch the CT scanning photographs in turns so as to carry out reasonable explanation for the patient and analyze the conditions of diseases, the CT scanning photographs can be placed smoothly, no bending phenomenon is caused, and the automatic adjustment of the watching height for the CT scanning photographs and the adjustment of the resolution of images displayed by CT scanning also can be realized, so that the CT device is safe and reliable in operation.