118results about How to "Overall small size" patented technology

This utility model discloses a three-dimensional heat exchanger and controller. The three-dimensional heat exchanger includes a top plate with a first protrusion having a first cavity. A first capillary structure is disposed within the first cavity and communicates with a first receiving cavity of the three-dimensional heat exchanger. After the working fluid in the three-dimensional heat exchanger evaporates in the evaporation zone at the bottom of the heat exchanger, it rises to the top of the first cavity after passing through the first receiving cavity. The vapor diffuses to the condensation zone through the vapor chamber, and the liquid phase flows back through the first capillary structure within the first cavity of the first protrusion. Because the heat exchanger of this application is more three-dimensional due to the first protrusion with a first cavity on the top plate, it can exchange heat in the vertical direction, utilizing more surface area for heat exchange. Furthermore, because the first capillary structure provides a specific channel for vapor to diffuse to the condensation zone, the liquid can also flow back to the evaporation section along a specific path, reducing the resistance to heat transfer. This improves heat exchange efficiency without excessively increasing the volume of the heat exchanger.

This utility model discloses a foldable electric stubble trimmer, belonging to the field of agricultural and livestock machinery. It includes a main frame with two symmetrical longitudinal beams and a main ground wheel below. A short beam is connected to the upper rear of the longitudinal beams via a rear pin and a front pin. A sub-frame is hinged to the outer side of the short beam. The sub-frame has casters below and a liftable motor frame above, with several motors arranged horizontally on the motor frame. A wire rope trimming head is installed at the lower end of the motor shaft. A generator provides power to the main frame. The sub-frame can be folded 90° and secured with a locking pin. This device has a compact structure, is portable, has high efficiency for wide-area operation, can follow contours and adjust the stubble height, reducing damage to pastures caused by trampling.

The invention belongs to the technical field of ecological water, mainly relates to ecological water for removing fruit peculiar smell, and particularly relates to ecological water for removing fruit peculiar smell and a preparation method thereof. Neotame and glucose modified cortex phellodendri are matched with tupistra chinensis, pogostemon cablin, liquorice and clove to be decocted into a traditional Chinese medicine decoction. According to the invention, lactobacillus plantarum ATCC 8014 and bacillus subtilis ATCC 6633 are used for fermentation. The antibacterial activity of the ecological water is improved, and the bitter taste of the cortex phellodendri is effectively removed due to the synergism of the two sweetening agents, namely the neotame and the glucose. The bacillus subtilis HZ-72 antagonistic bacteria used in the invention can enhance the capability of inhibiting pathogenic bacteria. Syzygium aromaticum has antibacterial activity, pogostemon cablin has an antiviral effect, and the syzygium aromaticum and the pogostemon cablin cooperate to enhance the antibacterial The ecological water prepared by the invention can remove peculiar smell and preserve freshness, and has a great development prospect in the field of fruit preservation.

The utility model relates to the technical field of fish culture, in particular to a rapid fishing device which comprises a main body frame and an inserting rod fixedly connected with the surface of the main body frame and further comprises an adjusting assembly. The adjusting assembly comprises a rotating shaft, the rotating shaft is rotatably connected with the inner wall of the main body frame, the surface of the rotating shaft is fixedly connected with a winding drum, the surface of the winding drum is sleeved with an adjusting rope, one end of the adjusting rope is fixedly connected with the surface of the winding drum, and the other end of the adjusting rope is fixedly connected with a fish cage; positioning holes are formed in the surface of the fixing disc, a fixing frame is fixedly connected to the surface of the body frame, positioning rods are slidably connected to the inner wall of the fixing frame, and first screw holes are formed in the surface of the fixing frame. By arranging the adjusting assembly, the distance between the two sets of fish cages can be rapidly adjusted in a labor-saving mode according to the widths of different fish channels, the size and weight of the whole device are small, carrying, moving and placing are convenient, and the convenience of the device is effectively improved.

The application provides a static pressure balance type underwater self-driven flexible touch pressure sensing finger, which comprises a touch pressure sensing unit, a hydraulic cylinder, a pressure transmission unit, a piezoelectric transducing unit, a transducing unit support, a platinum electrode and a base, the touch pressure sensing unit and the pressure transmission unit are connected with the hydraulic cylinder through bolts, and the oil cavity between the piston end faces is filled with hydraulic oil; the piezoelectric transducing unit is inserted into the stepped through hole in the cylinder wall of the transducing unit support; the pressure transmission unit and the base are connected with the transducing unit support through a flange and a threaded pair; the platinum electrode is fixed in the lead hole of the piezoelectric transducing unit, and the lead of the platinum electrode is led out from the lead hole of the base and connected to a pressure detection circuit. Based on the area effect of Pascal's principle and the solid-liquid interface double electric layer principle, the application can convert the tiny pressure detected by the finger tip into a larger elastic deformation of the flexible hose, so as to generate a high-amplitude ionic current signal and transmit it to the pressure detection circuit, and realize the sensing, amplification and measurement of the pressure signal.

The utility model discloses a magnetic portable brushless motor drilling and tapping machine, it includes: main body, lifting assembly, magnetic attraction base. The main body includes shell group, rotation part, linkage assembly, brushless motor, control module, one department, and the accommodation department has the accommodation groove, electric capacity groove, and the accommodation department sets up the downside of the corresponding brushless motor of shell group with the part with electric capacity groove, and control module is electrically connected with brushless motor, and control module is located in the accommodation groove, and control module includes at least electric capacity, and electric capacity is at least partially located in the electric capacity groove, and thus can effectively reduce the overall volume of the utility model.

The application discloses a kind of millimeter wave broadband filtering antennas with wide-angle beam scanning function and array, from top to bottom include broadband radiator, metal ground layer and microstrip line feed layer in sequence, the broadband radiator includes first rectangular patch, second rectangular patch and driving patch;By controlling the size of first metal patch, second metal patch and driving patch, the resonant frequency of broadband radiator is regulated;By adjusting the distance between first rectangular patch, second rectangular patch and driving patch, and the spacing of adjacent first metal patch and adjacent second metal patch, the coupling amount of broadband radiator is regulated, and the bandwidth of broadband radiator is further regulated.The application has simple and compact structure, wide impedance bandwidth, and can cover four millimeter wave frequency bands.

The utility model discloses a wind tunnel rack, and relates to the technical field of automobile part test and aerodynamic measurement. The device comprises an air pipe, a conical cover is fixedly arranged at one end of the air pipe, a pipe head is fixedly arranged at the other end of the air pipe, an air supply assembly is arranged at one end of the conical cover, and testing assemblies are arranged on the air pipe and the pipe head. The air supply assembly comprises an air blower; an air valve is assembled at an air suction opening of the air blower; according to the utility model, the whole device is composed of the fan module, the control module, the sensor module, the air duct system and the test cavity, and all the modules are connected through standard interfaces, so that rapid assembly, disassembly and maintenance are facilitated, and the device is suitable for multi-scene deployment; the rotating speed of the air blower is accurately adjusted through the frequency converter, and a full-range speed wind field from low speed to high speed can be simulated in combination with a pressure difference conversion algorithm, so that the test is closer to the actual driving working condition, and the reference value of data engineering is improved.

This invention belongs to the technical field of DC power supply information acquisition devices, specifically relating to a DC power supply information acquisition and synthesis device. The invention includes an embedded monitoring host connected to an acquisition and synthesis module. The embedded monitoring host includes: an upper-level monitoring device, a lower-level monitoring device, a main control chip, and a display device. The acquisition and synthesis module includes: an AC input voltage acquisition module, a DC voltage and current acquisition module, a switch quantity acquisition module, a fault hard contact output module, and a communication module. The AC input voltage acquisition module, DC voltage and current acquisition module, switch quantity acquisition module, and fault hard contact output module are each connected to the communication module. The communication module is connected to both the upper-level and lower-level monitoring devices. This invention features a simple structure, convenient wiring, high integration, stable performance, good scalability, and low cost.

The application discloses a multi-pass disk laser amplifier, which comprises a near end and a far end, a pump laser beam, a seed laser beam, a first parabolic mirror, a second parabolic mirror, a laser gain medium, a first deflection optical prism group and a second deflection optical prism group, wherein the laser gain medium comprises a medium reflection surface; the pump laser beam located at the near end is aligned to the first parabolic mirror located at the far end for incidence through a first beam collimator; and the seed laser beam located at the near end is aligned to the second parabolic mirror located at the far end for incidence after passing through a second beam collimator. Compared with a conventional multi-pass disk laser amplifier, the application has a simpler structure, a shorter amplification optical path, a more compact volume and higher system stability. Furthermore, by changing the structure of the design prism of the pump light path, 12-pass, 24-pass, 36-pass, 48-pass and other multi-pass amplifications can be realized.

The application discloses a fast-axis collimating lens and an optical device with the same, and relates to the technical field of laser optical elements. The fast-axis collimating lens comprises a cylindrical base and a composite film layer arranged in sequence along the direction of incident light. The light-in surface of the cylindrical base is a plane, the light-out surface of the cylindrical base is a convex surface, and the radius of curvature of the cylindrical base is greater than 2.5 mm. The composite film layer comprises at least one high-refractive-index transmission film layer, and the refractive index of the high-refractive-index transmission film layer ranges from 1.8 to 2.4. The fast-axis collimating lens is used to realize the collimating function by the synergic design of the film layer and the base structure, the low-convexity base is matched with the high-refractive-index transmission film layer, the processing and integration are facilitated, and the optical and mechanical properties are effectively improved.

The invention discloses a cabin relative pose measurement method based on non-cooperative assembly characteristics, and the method employs a displacement sensor and a visual camera to form a double-sided measurement device, synchronously measures the assembly characteristics of a cabin, calculates and decouples the relative poses of six degrees of freedom, and provides a basis for pose adjustment assembly. According to the method, heterogeneous measurement data fusion and coordinate system unification of the displacement sensor and the visual camera are achieved, mutual decoupling and synchronous posture adjustment of six degrees of freedom can be achieved, the posture adjustment convergence rate is increased, and the assembly efficiency can be effectively improved.

The invention discloses a zoom projection optical system, and relates to the technical field of projection systems.The zoom projection optical system is provided with an object side and an image side which are correspondingly arranged in the optical axis direction, and the zoom projection optical system comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and a light-emitting chip which are sequentially arranged from the object side to the image side; the first lens group, the second lens group, the third lens group and the fourth lens group are movably arranged along the optical axis direction, the second lens group, the third lens group and the fourth lens group are used for zooming, and the first lens group is used for focusing. Through the arrangement, the imaging quality of the zoom projection optical system can be ensured, the characteristics of small size and low cost of the zoom projection optical system are met, the zoom projection optical system has excellent thermal stability, the thermal virtual focus phenomenon of the whole zoom projection optical system in a high-temperature state is reduced, and the service life of the zoom projection optical system is prolonged. The zoom projection optical system can still keep good imaging performance on the premise that the temperature deviation is not larger than 20 DEG C.

The utility model provides an infusion device which comprises a shell, an infusion tube, an infusion tube and an infusion tube. The medicine storage bag is arranged in the accommodating cavity; the remaining needle assembly is mounted in the mounting opening; the infusion pump is arranged in the containing cavity, the input end of the infusion pump is communicated with the medicine storage bag through a medicine inlet pipeline, and the output end of the infusion pump is communicated with the remaining needle assembly through a medicine outlet pipeline. According to the scheme, a piston component is omitted, the internal structure of the infusion device is fully simplified, the size and weight of the infusion device are smaller, and the use experience of the infusion device is effectively improved.

The utility model relates to a machine vision and industrial detection technology, in particular to a rapid focusing industrial lens structure, an industrial lens, a control system and an industrial vision detection device, wherein the rapid focusing industrial lens structure adopts an electrowetting liquid lens to realize millisecond-level automatic focusing. A fast focusing industrial lens structure is composed of eight glass lenses and an electric control liquid lens, and the nominal value of the optical focal length is 35 mm. Within the object distance range of 225-600mm, the liquid lens realizes millisecond-level automatic focusing by adjusting the curvature of a liquid interface, and the optical back focal length and the mechanical back focal length are kept unchanged. Through actual measurement, the absolute value of lens distortion is less than or equal to 2%, the curvature of field is less than or equal to + / -0.2 mm, the full-field relative illumination is greater than or equal to 95%, and the high-resolution imaging requirements of industrial vision, automatic detection and robot precise positioning scenes can be met.

The utility model is suitable for the technical field of gas station communication, and provides a wearable device for mutual trust of gas stations. An explosion-proof communication watch main body; the slot is formed in the right end of the explosion-proof communication watch main body, and a placement table is arranged in the slot in a sliding manner; the first placement grooves are symmetrically formed in the front end and the rear end of the upper end of the placement table, and wireless anti-explosion earphones are arranged in the first placement grooves and wirelessly connected with the anti-explosion communication watch body. Compared with the prior art, the anti-explosion communication watch has the beneficial effects that when the anti-explosion communication watch is used, the anti-explosion communication watch main body is arranged, so that objects can be conveniently switched, the wireless anti-explosion earphone is arranged on the side surface of the anti-explosion communication watch main body, and the universal supporting rod and the microphone are arranged on the wireless anti-explosion earphone, so that the communication is convenient; compared with a traditional explosion-proof interphone, the explosion-proof interphone is more compact in size, smaller in size and convenient to carry.

The application relates to the technical field of water treatment equipment, and relates to a water treatment equipment which comprises a water storage device and a temperature adjusting device; the temperature adjusting device comprises a heat exchange structure and a heat exchange component; the heat exchange structure has a first heat exchange end and a second heat exchange end; the first heat exchange end is thermally coupled to the water storage device; and the second heat exchange end is thermally coupled to the heat exchange component; wherein the heat exchange structure comprises a first heat exchange piece and a second heat exchange piece; and the first heat exchange piece is thermally coupled to the second heat exchange piece. The water treatment equipment of the embodiment adopts the heat exchange structure of double refrigerating pieces superposition; the first heat exchange piece is thermally coupled to the second heat exchange piece; one refrigerating piece is used to cool the other refrigerating piece; the temperature difference between the two ends is obviously improved; and the heat exchange effect is improved.

The utility model relates to a high-efficiency radiator, which comprises a main body and radiating fins extending from the main body, the main body is provided with a first side surface and a second side surface opposite to the first side surface, the main body is provided with a first mounting groove corresponding to the first side surface, a first auxiliary fan is mounted in the first mounting groove, and a second auxiliary fan is mounted in the second side surface. The body is provided with a plurality of first bent channels arranged in a crossed mode, one ends of the first bent channels are communicated with the first installation grooves, and the other ends of the first bent channels correspond to the cooling fins. According to the efficient radiator, besides traditional radiating fins, the main body is further provided with the auxiliary fan and the bent channel, and the radiating effect is enhanced by increasing the wind speed between the main body and the radiating fins, so that the size of the original main body is not increased, and the radiating effect can be improved.

The invention provides an optical system, a three-dimensional information acquisition method and a three-dimensional reconstruction method.The optical system comprises a super-structure grating, a focusing lens and an imaging detector which are sequentially arranged along an optical axis, and the super-structure grating splits reflected light beams of a target object on at least four different diffraction levels to obtain at least four polarization sensitive light beams; the focusing lens is used for focusing the light beams split by the super-structure grating to different imaging areas of the imaging detector to form a plurality of sub-images, and the plurality of sub-images comprise polarization sub-images in one-to-one correspondence with the at least four polarization sensitive light beams; the image processing module is in communication connection with the imaging detector, and the image processing module calculates the depth information of the target object according to the parallax of the at least two sub-images and calculates the polarization information of the reflected light beam according to the at least four polarization sub-images; depth information and polarization information can be obtained through single shooting, and the optical system is simple and compact in size.

The invention relates to the technical field of broken nylon bag packaging, in particular to an automatic nylon bag packaging device which comprises a main body, a supporting column is arranged on the lower side of the main body, a guiding mechanism is arranged on the upper side of the main body, a compression assembly and a dust accumulation mechanism are arranged in the main body, and a packaging mechanism and a discharging mechanism are fixedly arranged on the side face of the main body. The guide mechanism comprises a drainage plate, and a nozzle is fixedly arranged on the lower side of the drainage plate in a penetrating mode and flushes the interior of the body for dust falling. Collecting, compressing, packaging, discharging and dust accumulation function modules are integrated, and a sensor and a controller are arranged in a matched mode for detection control, so that scattered broken nylon bags are automatically arranged, the size is compressed, the broken nylon bags are wound into bundles, dust is synchronously controlled, finally, a regular, compact and convenient-to-transport wrapping body is formed, manual intervention is not needed, and the production efficiency is improved. And the automation level and environmental sanitation of a factory are improved, and harm to respiratory health of operators is avoided.

The invention belongs to the technical field of spacecraft ground test equipment, and particularly relates to a microgravity simulation device for spacecraft component ground test, which comprises a base, an air floatation support mechanism, an ultrasonic standing wave stabilization mechanism, a self-adaptive clamping mechanism, a servo drive error compensation mechanism, a control system and a test platform. The air floatation supporting mechanism provides vertical non-contact supporting force to offset gravity, the ultrasonic stabilizing mechanism maintains horizontal stability, the self-adaptive clamping mechanism is adaptive to parts of multiple sizes, and the servo compensation mechanism corrects deviation in real time. The composite suspension structure is combined with PID-fuzzy closed-loop control, the simulation error is controlled within 4.0%, the defects that existing equipment is low in precision, short in time, prone to pollution and poor in universality are overcome, long-time stable simulation can be achieved, and reliable support is provided for part ground verification.

This application relates to the technical field of aerosol generation equipment, specifically to an atomizer and an electronic atomizing device. The atomizer includes: a housing with an installation port on one side; a mounting bracket disposed within the housing, which, together with the housing, defines a liquid storage chamber for storing the atomizing matrix; an atomizing component disposed on the mounting bracket and in fluid communication with the liquid storage chamber, having an atomizing air passage for heating the atomizing matrix to form an aerosol, which is then output through the atomizing air passage; a base assembled at the installation port, which, together with the mounting bracket, forms a recovery chamber configured to recover condensate flowing back from the atomizing air passage; one of the base and the mounting bracket has a positioning protrusion, and the other has a positioning groove, the positioning protrusion being inserted into the positioning groove; the sidewall of the positioning protrusion and / or the positioning groove is provided with a liquid-locking groove, which communicates with the recovery chamber and is configured to contain and lock condensate overflowing from the recovery chamber. By providing the liquid-locking groove, the atomizer's ability to recover condensate is improved.

This invention discloses a non-standard drill pipe loading and unloading jig. It utilizes a clearance notch to avoid the protruding ribs on the drill pipe section surface. The upper surface of the support plate vertically abuts against the drill pipe section, providing support. Compared to using friction generated by clamping to resist the weight of the drill pipe section, this method avoids damage and is well-suited for loading and unloading large drill pipe sections. The support plate extends radially through a pad to abut against the support surface around the drill pipe. The two components are separate, reducing the weight and volume of individual parts. The pad is designed to consist of multiple arc-shaped pads, and the support plate is designed to consist of multiple arc-shaped support blocks. This not only facilitates installation and use but also further reduces the weight and volume of individual components, improving manufacturing, transportation, and use. This non-standard drill pipe loading and unloading jig is not only simple in structure but also effectively addresses the problem of existing drill pipe jigs being unsuitable for large drill pipes with protruding ribs, thus reducing drilling difficulty.

The embodiment of the utility model relates to the technical field of electric appliances, and discloses a driving device and an electric toothbrush. The motor comprises a shell and a rotating shaft with the two ends extending out of the shell. The motor drives the rotating shaft to rotate around the axis in a reciprocating mode in the working state. The air cylinder comprises a cylinder body, an air inlet one-way valve and an air outlet one-way valve, the cylinder body is provided with a moving end, an air inlet and an air outlet, the air inlet one-way valve is arranged at the air inlet, and the air outlet one-way valve is arranged at the air outlet; one end of the rotating shaft is in driving connection with the moving end through the connecting assembly, the rotating shaft drives the moving end to reciprocate to change the volume of a cavity in the cylinder body, when the volume of the cavity in the cylinder body is increased, the air inlet one-way valve is opened to suck air from the air inlet, and when the volume of the cavity in the cylinder body is decreased, the air outlet one-way valve is opened to discharge air from the air outlet. By means of the mode, the driving device can drive the rotating shaft and the air cylinder at the same time only through one motor, and the size and the weight are smaller.

The application belongs to the technical field of photonic artificial micro-nano structure design and image processing, and discloses an optical spatial differential device for target extraction, a reverse design method and application. The method comprises the following steps: setting a target transfer function according to the functional requirement of an optical device; establishing an optimization model according to the design parameters of a super surface, the design parameters being dielectric constant distribution, and performing certain constraint and binary processing on the design parameters in each iteration process; judging whether the loss function converges or not, outputting an optimization scheme if the loss function converges, and otherwise, performing gradient calculation and continuing the next iteration optimization process. The optical spatial differential device is based on the diffraction optical angular spectrum theory and the Fourier transform property, directly acts on an incident light field image, realizes spatial frequency regulation of the light field image in the wave vector space, and thus achieves the purpose of processing the image in the optical domain. The obtained patterns of the application can be directly applied to a double photopolymerization 3D printing technology, so as to prepare a sample.

The application discloses a kind of multi-band high-power solid-state power amplifier, belong to radio frequency power amplification technical field, the amplifier includes radio frequency matching path unit, radio frequency power amplification unit, power supply unit and monitoring processing unit;Radio frequency matching path unit uses input triplexer and output heterodyne triplexer, and single-path input signal is separated into 1.1GHz~1.3GHz, 1.5GHz~1.7GHz and 2.45GHz~2.55GHz three frequency bands independent path, and is output after amplification with high efficiency. The power amplification unit corresponding to each frequency band is all adopted multistage gallium nitride power amplifier tube, and the saturated output power of ≥57dBm is realized;Monitoring processing unit realizes the full state protection of overvoltage, overcurrent, overtemperature, output reflection and open circuit.The whole machine adopts AL6061 aluminum alloy fully enclosed integrated shell, and the shell back is integrated with the thickness ≥10mm heat dissipation tooth.The application has high gain, high isolation, high reliability and excellent outdoor environmental adaptability, and can meet the strict requirements of multi-band navigation jamming signal parallel amplification.

The invention belongs to the technical field of pipeline exhaust, and discloses an intake and exhaust valve and a pipeline system. The air inlet and exhaust valve comprises a valve body assembly, a floating ball assembly, a plugging piece and a shielding piece, a containing cavity is formed in the valve body assembly, a main exhaust hole communicated with the containing cavity is formed in the top of the valve body assembly, the floating ball assembly and the plugging piece are both arranged in the containing cavity, and the floating ball assembly is in sliding connection with the valve body assembly in the vertical direction; the blocking piece is slidably connected to the top of the floating ball assembly in the vertical direction and can block the main exhaust hole, a micro exhaust hole is formed between the blocking piece and the floating ball assembly, the micro exhaust hole is in a blocked state when the blocking piece is attached to the top of the floating ball assembly, and the micro exhaust hole is in a conducted state when the blocking piece is separated from the top of the floating ball assembly. The shielding piece is fixedly arranged on the floating ball assembly, and when the blocking piece is attached to the top of the floating ball assembly, the shielding piece is arranged on the periphery of the blocking piece in a blocking mode. The intake and exhaust valve improves the exhaust effect on the connecting water pipe and is simple in structure.

The utility model relates to filter technical field, specifically disclose a compact multistage LC filter, the filter includes rectangle insulating substrate, its four corner position is equipped with mounting hole, the filter shell is fixedly installed above the insulating substrate, the both ends of filter shell are equipped with input and output port, in the filter shell, the insulating substrate top is equipped with at least two stages filter unit, and each stage filter unit contains spiral inductance and interdigital capacitance, and they are connected through microstrip line between the filter unit of adjacent stage alternately cascaded. Two insulating shield baffles are arranged between the adjacent filter units, which are connected with the insulating substrate and the filter shell, and the shielding layer formed between the insulating shield baffles is connected with the bottom ground plane through the metallized via on the insulating substrate. The filter realizes compact volume, excellent filtering performance and anti-interference ability through three-dimensional inductance, shielding structure and optimized layout.

This utility model discloses an industrial control computer for industrial applications, specifically an industrial control computer for a pick-and-place machine. It includes a housing, a board assembly and a heat dissipation assembly housed within the housing. The housing includes a cover and a base plate located below the cover. The cover has an exhaust vent on its top side and air inlets on its sides and rear side. The heat dissipation assembly includes an exhaust fan, an intake fan, and a heat sink. The intake fan is located inside the cover corresponding to the air inlet, the exhaust fan is located inside the cover corresponding to the exhaust vent, and the heat sink is located above the exhaust fan. This solution addresses the FPGA high-temperature alarm problem and meets the requirements of pick-and-place machine industrial control computers for compact size, efficient heat dissipation, and reasonable cost.