Disc dispensing device for dispensing discs impregnated with antibiotics onto a culture dish. The device comprises a stationary support on which a magazine is removably mounted. The magazine holds a plurality of tubular containers each containing a stack of discs to be dispensed. A moving means moves one disc from a bottom end of a tubular container to a pick-up position. From the pick-up position a transfer means picks up said one disc and transfers it to the culture dish where it is dispensed. The removable culture dish is supported by a moveable carriage which is mounted on the stationary support. The carriage is moveable relative to the magazine from a starting position to an operating position and vice versa. Control means control the operation of the device. The plurality of tubular containers is rotatable around a magazine center under control of the control means.

Embodiments provide a unidirectional multi-path kiln with two or more chambers and generally parallel flow paths extending through the kiln, on opposite sides, from charge entry portals at a first end of the kiln to charge exit portals at a second end of the kiln. Moist heated air flowing from the second heated chamber is received in the first chamber and circulated around the lumber charges with one or more fans. The lumber charges proceed in the same direction on the flow paths through the heated second chamber, which may be an existing kiln. Charge exit portals at the distal end of the kiln and/or intermediate charge portals between the second chamber and a third chamber may be provided with insulating members configured to reduce airflow from the second chamber through the charge exit portals.

A simulation apparatus includes a storing unit that stores therein information about a shape of a blank piece to be cut out from raw wood, information about a final shape of a wooden piece obtained by compressing the blank piece, and image data of a surface of the blank piece. The apparatus also includes detecting unit that detects a knot appearing on the surface of the blank piece by image recognition using the image data; a shape estimating unit that estimates a shape of the detected knot using shape information on the blank piece; and a determining unit that determines, in accordance with the shape of the estimated knot, a cutting location and a cutting shape of the blank piece in such a manner that the cutting location and shape include a part and a thickness of the knot is substantially the same as that of the compressed blank piece.

A table tool includes a table which carries a power tool. The table includes table base and a table top. The table top includes a central table top portion fixed to the table base. The central table top portion of the table top includes a left perimeter, a right perimeter, and a rear perimeter. A first table top extension is configured to be selectively coupled to the table on the left perimeter, and the right perimeter of the central table top portion with the first table top extension slideable relative to the central table top portion. A second table top extension is configured to be selectively coupled to the left perimeter, the right perimeter, and the rear perimeter of the central table top portion with the second table top extension fixed relative to the central table top portion.

A retractable cord winder device, which has a front cover with center shaft, a spiral spring, a spool with a spool divider with flanged hook dividing the spool chamber into equal halves for efficient and minimal noise cable coiling, oval sliding positioning sliding disc, and a rear cover with concave recess to hold the oval positioning sliding disc with positioning stopper. The front cover is mounted with the rear cover through the center shaft via a center hole of the rear cover where there are symmetrical openings on both ends for cords folded in half to be attached to the flanged hook and retracted upon pulling down.

A hose deployment and retrieval system is described that includes a modular reel assembly. The modular reel assembly includes a reel having a hub around which a hose may be wound and a wheel assembly on either side of the hub and spaced to accept the hose there between. The reel assembly also includes an axle in the center of the hub around which the hub can spin and a base holding the axle. A deployment fork assembly includes a reel assembly mount for engaging with the modular reel assembly and a drive mechanism to spin the reel when the deployment fork assembly is engaged with the modular reel assembly, wherein the deployment fork assembly is adapted to mount to a vehicle.

A system and process is described for producing spirally wound products. According to the process of the present disclosure, two or more webs are conveyed together in a superimposed relationship. The webs are then separated such that one web goes to a first winding module while a second web goes to a second winding module, etc. In this manner, at least two spirally wound products can be produced simultaneously. The process and system of the present disclosure are particularly well suited for processing tissue webs, such as paper towels and bath tissue. The process of the present disclosure can effectively at least double throughput on existing winding systems.

A trough is cut in the ground surface by a rotating member. The rotating member displaces soil upward with respect to the ground surface and rearwardly with respect to a direction of travel of the rotating member. While the soil is in the air, slurry is deposited into the trough. The soil is then redirected downward to the trough to cover the slurry with the soil.

A method and apparatus are described for creating a pass marker in a field. During planting, planting of seed is stopped and started on pass marker rows differently than on adjacent rows to create a visible offset to assist a harvester or applicator to find and drive down the right row to prevent skips and overlaps.

Methods for fumigating soil include providing a fumigant including at least one volatile substance into or onto soil and applying over the soil a multilayer polymeric film to form a vapor barrier between the fumigant-treated soil and the atmosphere to at least partially contain the fumigant. The multilayer film includes at least one barrier layer comprising at least one vinylidene chloride polymer and protecting layers on each side of the barrier layer. The multilayer film preferably has at least one UV protecting layer and optionally at least one reflective layer.

A system for controlling air flow within an agricultural product metering system is provided. One system for distributing an agricultural product includes an air conveyance system having a blower configured to provide an air stream for moving metered product toward a distribution device. The air conveyance system is mounted on an air cart. The system also includes control circuitry mounted on an agricultural vehicle, and configured to adjust a speed of the blower based at least partially on a product flow rate from the air cart.

A double shoot coulter assembly for an agricultural implement includes a packer wheel. The packer wheel is disposed behind a soil engaging blade. The packer wheel is configured to press soil displaced by the soil engaging blade into trenches formed by the soil engaging blade and a disc blade. A centerline of the packer wheel extends adjacent to a soil displacing side of the soil engaging blade.

A method and apparatus for automating some of the tasks that heretofore required operator action at headland turns or similar events are provided. The present invention automates operation of lift assist wheels and/or gull wings, such as those found on a stack-fold implement, based on the position of the tractor hitch to which the implement is coupled. An operator may control the position of the implement, such as at a headland turn, by raising and lowering the tractor hitch using a remote control. The invention enables the planter to compare the tractor hitch position relative to an implement position and control operation of the implement accordingly without additional user inputs.

Agricultural devices, row unit adjustment systems, and methods of adjusting a depth of a furrow are provided. In some aspects, an agricultural device is adapted to plant seeds and includes a frame, a furrow opener coupled to the frame and adapted to cut a furrow including a depth, a sensor adapted to sense a characteristic associated with planting seeds and generate a signal associated with the sensed characteristic, and a processing unit receiving the signal associated with the sensed characteristic. The depth of the furrow is adjustable based on the signal associated with the sensed characteristic. Such characteristic may be a characteristic of the soil, a force applied to the agricultural device, or a position of a portion of the agricultural device.

An agricultural side dressing fertilizer coulter row unit includes a first attachment member adapted to be rigidly connected to a towing frame, and a second attachment member pivotably coupled to the first attachment member for pivoting movement about a substantially vertical axis. A linkage is pivotably coupled to the second attachment member for pivoting movement of the trailing end of the linkage relative to the second attachment member, and a tool-carrying stem pivotably coupled to the trailing end of the linkage carries a rotatably mounted coulter wheel for forming a slit in the soil, a liquid fertilizer dispenser for dispensing fertilizer, and a rotatably mounted closing wheel for closing the slit. A biasing element is pivotably attached to the linkage and coupled to the second attachment member for urging the stem downwardly with a controllable force.

A seeder implement (125) includes a fork (146) having a first spindle support arm (150) that supports a first spindle (164) and a second spindle support arm (152) that supports a second spindle (168). A first disk (160) is supported on the first spindle (164), wherein the first spindle (164) is oriented in a first orientation and at a first acute angle relative to a lateral line. The first disk (160) is oriented at a second acute angle relative to the ground surface. A second disk (166) is supported on the second spindle (168), wherein the second spindle (168) is oriented in a second orientation and at a third acute angle relative to the lateral line. The second disk (166) is oriented at a fourth acute angle relative to the ground surface. The first disk (160) is longitudinally offset ahead of the second disk (166), and there are no structural components between the first and second disks (160, 166) other than the first and second spindles (164, 168). In one embodiment, a packing wheel (142) is disposed to close and compact furrows opened by the disks (160, 166) and is disposed in the same orientation as one of the disks (160, 166).

Agricultural seed planting systems are provided. In some aspects, the system includes a processing unit, a frame, a furrow opener coupled to the frame for opening a furrow in soil, and a sensor in communication with the processing unit and adapted to sense a characteristic associated with seed planting. The sensor may generate a signal associated with the sensed characteristic and the processing unit may receive the signal. In some aspects, the sensed characteristic may be either a soil characteristic or a seed characteristic. Information associated with the sensed characteristic can be saved in memory for future use and to assist with more effective planting in the future.

A wireless communication system for agricultural vehicles, in which each vehicle has a global positioning system (GPS), a multi-channel transmitter/receiver module having a limited communication range, and a signal processor connected to the transmitter/receiver module. The transmitter is controlled by the signal processor to transmit on a predetermined communication channel a signal comprising a unique vehicle identifier and a signal indicating the current positional coordinates of the vehicle. The signal processor also analyzes the signals received from other vehicles within the communication range and determines from the identifier and the positional coordinates data when another vehicle is ready to perform a joint operation with the vehicle. Prior to initiation of a joint operation, the communication system is switched to a different communication channel.

A seeding machine, such as a row crop planter, is described which is adapted to switch between two or more seed varieties as the machine traverses a field. The control system uses a programmed quantity of seed representing a number of seeds in the seed meter that need to be substantially consumed once the flow of a first seed variety is stopped before introducing a second seed variety to minimize seed mixing. The seed quantity can be determined by a calibration process or published from the manufacturer or third parties. The seed quantity can also be part of a seeding prescription that includes assignment of where each seed variety is to be planted in a field. The seed quantity and the distance traveled to empty the meter can be used to optimize the planting operation including the machine direction which can also be part of the prescription.

A seeding machine, such as a row crop planter, is described which is adapted to switch between two or more seed varieties as the machine traverses a field. The control system uses a programmed quantity of seed representing a number of seeds in the seed meter that need to be substantially consumed once the flow of a first seed variety is stopped before introducing a second seed variety to minimize seed mixing. The seed quantity can be determined by a calibration process or published from the manufacturer or third parties. The seed quantity can also be part of a seeding prescription that includes assignment of where each seed variety is to be planted in a field. The seed quantity and the distance traveled to empty the meter can be used to optimize the planting operation including the machine direction which can also be part of the prescription.

The seed distribution tower of an air seeder has a distribution head that splits a single, primary stream of conveying air and seeds into a plurality of secondary streams for delivery to openers that deposit the seeds into the ground as the seeder advances. The outlets through which the secondary streams exit the head are constructed as modules that can be individually installed and replaced without disassembling the entire head. Shut-off valves and/or flow sensors may or may not be incorporated into certain or all of the modules to provide optimum user flexibility.

A seed tube guard for agricultural planters is cast from a high-chrome cast-iron alloy or manufactured from other wear-resistant material. The seed tube guard has right and left wear surfaces for engaging inner surfaces of a pair of opener discs. A fluid delivery channel is integrated within the body of the seed tube guard with an exit in the bottom surface for delivering fluid into a seed furrow ahead of a seed tube.

A seed singulator for use with a vacuum disk having a seed face and a shoulder. The seed singulator has a first member and a second member supported by biasing members. The first member has upper lobes disposed at a radius of curvature slightly less than the outside radius of a row of apertures on a seed plane of the vacuum disk. The seed member has lower lobes disposed at a radius of curvature slightly greater than the inside radius than the row of apradius. The biasing members permit the lobes to move with the seed plane and the shoulder as the vacuum disk rotates thereby maintaining their position with respect to the apertures.

A soil opener has a frog mount adapted to be coupled to a shank or other mounting member of a farm implement. A spreader is removably coupled to the frog mount and includes forward and rearward product delivery channels that are intended to be flow-coupled to product delivery tubes or hoses of the farm implement. A tip is removably coupled to the spreader. The leading edges of the frog mount, the spreader, and the tip, as well as the geometry between these components are such that drift is minimized even when the soil opener is pulled through the soil at higher speeds, e.g., excess of 5 mph. The soil opener may be equipped with an optional soil gathering module that gathers soil lifted by the tip and redirects the soil to a position generally rearward of the opener.

An agricultural implement includes a storage tank, a pump positioned below a bottom portion of the storage tank, and a control system disposed above the bottom portion of the storage tank. The storage tank is configured to hold a flowable agricultural product. The pump is configured to direct the flowable agricultural product out of the storage tank. The one or more controls are configured to control application of the flowable agricultural product.

A no-till apparatus for application of herbicide and fertilizer, soil preparation, and seeding of a cover crop in a standing crop has inter-row assemblies configured to pass along inter-row areas between adjacent row lines of standing crop plants. Each assembly includes a fertilizer applicator, a no-till soil preparation element, a cover crop seed applicator, and a post-seeding element.

An agricultural implement includes a frame assembly configured to support a storage tank. The frame assembly includes a pair of longitudinal beams positioned on opposite lateral sides of the storage tank, and multiple cross members extending between the pair of longitudinal beams. A substantially flat upper surface of each cross member is secured to a lower surface of each longitudinal beam, and each cross member is configured to support the storage tank via contact between the substantially flat upper surface of the cross member and a substantially flat lower surface of the storage tank such that the substantially flat lower surface of the storage tank is positioned vertically below an upper surface of each longitudinal beam.

A seed singulator system for a seed planter may comprise a seed container including a housing defining an interior to hold seed. A seed pickup assembly may be configured to pick up seeds individually from the interior, and the pickup assembly defines a plurality of seed-retaining holes configured to hold seed when a vacuum is applied to the holes. A seed discharging assembly may be configured to discharge seed in a singular manner from the seed container. The seed discharge assembly may comprise a seed receiver structure configured to receive seeds from the seed pickup assembly, and may define a seed-receiving passage having an entry opening for a seed to pass through, with the seed-retaining holes being alignable with the entry opening. A seed ejecting structure may be configured to eject seeds one at a time from the seed pickup assembly into the entry opening of the seed receiver structure.

An agricultural implement is provided that includes a first tool bar and a second tool bar each supporting respective ground engaging tools and fluid dispersal components. The second tool bar is pivotally coupled to the first tool bar. The agricultural implement further includes fluid conduits coupled to respective tool bars for conveying fluid to the respective fluid dispersal components. Additionally, each of the conduits has a flexible end adjacent to the other tool bar. Furthermore, the agricultural implement includes a fluid joint coupled between the first and second flexible ends and configured to provide a sealed connection between the first and second flexible ends during relative pivotal movement of the first and second tool bars in operation but to allow for uncoupling of the first and second flexible ends for servicing of the implement.

A tool bar mounting assembly for an agricultural implement. One agricultural implement includes a first tool bar assembly having a tool bar and a plurality of row units coupled to the tool bar and configured to deliver flowable agricultural product to a field. The agricultural implement also includes a frame assembly coupled to the first tool bar assembly. The frame assembly includes a mounting assembly having a mechanical linkage. The mechanical linkage is configured to removably couple the first tool bar assembly to the frame assembly via a plurality of fasteners. The frame assembly is configured to provide structural support to the first tool bar assembly. The mechanical linkage of mounting assembly is configured to removably couple a second tool bar assembly having a different configuration than the first tool bar assembly to the frame assembly via the plurality of fasteners.

One closing assembly of a row unit for an agricultural implement includes a frame configured to support ground-working tools of the row unit. Multiple arms are coupled to the frame, each arm of the multiple arms being independently rotatable about a common axis. Each arm is configured to be coupled to a closing disc configured to direct soil into a trench.

A method for producing a transparent and conductive metal oxide layer on a substrate, includes atomizing at least one component of the metal oxide layer by highly ionized, high power pulsed magnetron sputtering to condense on the substrate. The pulses of the magnetron have a peak power density of more than 1.5 kW/cm2, the pulses of the magnetron have a duration of ≦200 μs, and the average increase in current density during ignition of the plasma within an interval, which is ≦0.025 ms, is at least 106 A/(ms cm2).

A well, in particular an open well (14) with an upper end having a vertical axis (101), for containing a liquid and particles contained within said liquid, characterized by comprising at least two manipulation electrodes (1, 2, 3, 31, 32, 36, 17, 40, 41) able to be powered by electrical voltages, in particular alternating electrical voltages, so as to manoeuvre particles within the well by means of the dielectrophoretic effect. A platform comprising a plurality of wells as described above and a method for using said well.

A tongue pulled spreader and grader system having a pair of spaced apart sidewalls and cross beams to define a frame portion, a plurality of moveable or fixed blades extending between the sidewalls, each blade positionable along the length of each sidewall and fixed in position at a predetermined angle; a tongue for mounting the frame to the rear of a vehicle; a pair of wheels positioned on an axle on either side of the sidewalls; means for manually or hydraulically extending the wheels to a down position to make contact with a surface in order to transport the spreader and grader and for retracting the wheels to an up position so that the spreader and grader can undertake the grading process. The spreader and grader can attach to and be operated by ATVs, SUVs, light trucks, lawn tractors, sub compact tractors, side by side ATVs and fork trucks.

A towable soil pulverizer having a center section and foldable wings mounted by hinges on opposite sides of the center section to fold upwardly or downwardly about substantially longitudinal hinge axes. Each hinge has a spaced ball joint and guide roller in roller slot. A wing float axis for each wing extends substantially perpendicular to the longitudinal hinge axis in a transverse direction, each wing also being pivotal about the float axis. The hinge design with the float axis prevents weight transfer between the center section and wing sections when the pulverizer operates over uneven soil, providing uniform soil conditioning over the width of the pulverizer. The center section rollers are positioned ahead of, behind, or co-linear with the wing rollers. Lockout kits are provided for mounting in the roller guide slots for restricting motion.

A machine includes a plurality of ground engaging elements and an operator control station supported on a frame. A work tool is pivotably attached to the frame using a lift arm assembly and a tilt linkage. At least one device measures a quantity associated with at least one of the lift arm assembly, the tilt linkage, and the work tool. An electronic controller, in communication with an operator display and the at least one device. The electronic controller is configured to store an operator selected orientation of the work tool, calculate a current orientation of the work tool based on the quantity, and calculate a deviation of the current orientation from the operator selected orientation. A visual representation of the deviation is displayed on the operator display.

An articulated cutting head and conveyor mount for sod harvesting machines. The invention provides a linkage design that can provide many benefits including: allowing the operator to see the cutting operation, enabling the high lifting of the cutting head for service and maneuvering, managing the vertical bending load of the ground reference roller, providing high transverse stiffness, maintaining the position of the conveyor relative to the cutting head. The linkage design can include fewer parts than previous designs while still being robust and durable. As such, cutting heads employing the linkage design of the present invention can produce higher quality slabs with less service and maintenance than when using current designs.

An agricultural system includes an agricultural row unit movable on a field between a first soil condition and a second soil condition, the first soil condition having a different soil hardness than the second soil condition. A down-pressure actuator applies an initial first pressure associated with the first soil condition. A soil-hardness sensing device is positioned at a distance D forward of the row unit and outputs a soil-hardness change signal when detecting a change from the first soil condition to the second soil condition. At least one memory device stores instructions that, when executed by at least one processor, cause the down-pressure actuator to change, in response to receiving the soil-hardness change signal, the initial first pressure to a different second pressure when the row unit encounters the second soil condition.

A coulter assembly for an agricultural implement. The coulter assembly includes a support structure and a disc blade rotatably mounted to the support structure. The coulter assembly also includes a spring assembly coupled to the support structure and configured to urge the disc blade into soil. The spring assembly includes a variable rate spring.

A cultivator may include at least one rechargeable battery for an electrical power tool as a power source. The at least one rechargeable battery may include a plurality of rechargeable batteries. Further, the plurality of rechargeable batteries may be switched in sequence, so as to be used as the power source.

An agricultural machine (101; 201; 301) comprising two mainly parallel, in the direction of travel, cross-running disc implement rows (102a, 102c; 202a, 202b; 304a, 304b), wherein the orientation of the disc implements (102b, 102d; 203a, 203b; 302a, 302b) contained in the mentioned disc implement rows is arranged so that the fore row (102a; 202a; 304a) has disc implements that are mounted on a frame beam (110; 211; 303) and that are angled outwards and backwards towards the sides of the machine and in a dividing line mainly parallel to the direction of travel of the machine form a first point of change (208a, 304c), and the rear row (102c, 202b; 304b) has disc implements (102d; 203b; 302b) that are mounted on a frame beam (110; 211; 303) and that are angled inwards and backwards from the sides of the machine and in the dividing line form a second point of change (208b, 304a), wherein the fore row is adapted to throw soil from the first point of change outwards towards the sides of the machine and the other row is adapted to throw soil from the sides of the machine inwards towards the second point of change. The dividing line with the first point of change (208a, 304c), and with the second point of change (208b, 304) is arranged at a predetermined distance from the centre line of the machine (101; 201; 301) across the direction of travel.

A toolbar transport system for extending and retracting a large agricultural toolbar. Forward and rearward folding segments of the toolbar allow the toolbar assembly to retract against the sides of the vehicle without interfering with the steering wheels. A forward-folding segment and rearward-folding segment of each lateral toolbar section connect to provide steering wheel clearance in the transfer position and an integrated lateral toolbar with regularly-spaced ground-engaging implements in the application position. Gauge wheel assemblies assist in the extension and deployment of the toolbar assembly.

A hitch on a vehicle is raised and lowered by a hydraulic actuator controlled by an electrically operated valve. A control system receives a command that indicates a designated velocity and uses the command to operate the valve. Based on a reference external force exerted on the hitch, the control system is configured with relationships for converting a plurality of command values to corresponding electric current levels for operating the valve. The control system compensates for effects due to differences between the actual force acting on the hitch and the reference external force. Velocity feedback adjusts the electric current level applied to the valve. The passive load force control provides a predictor of the hitch load force to eliminate overshoot/undershoot of hitch motion. During hitch motion, the velocity feedback also compensates for effects due to load and hitch geometry changes that occur.

A method of making a tillage blade by obtaining a generally circular sheet metal steel disc having an outer peripheral edge. Waves are made in the outer peripheral edge of a circular steel disc in a predetermined pattern while the steel is cold. The outer peripheral edge is then sharpened at a predetermined acute angle with respect to a first plane by grinding. Then the disc is heat treated to make it harder so it will wear longer. If it is desired to have a concave/convex disc, instead of a coulter, then during the heat treating process the disc is deformed so that the sharpened portions of the peripheral edge remain generally in the first plane but a central portion of the disc is disposed at least partially in a second plane which is parallel to but spaced from the first plane.

A drive system for a mobile machine is disclosed. The drive system may have a travel speed sensor, at least one traction device speed sensor, and a controller in communication with the travel speed sensor and the at least one traction device speed sensor. The controller may be configured to determine a slip value associated with a traction device of the mobile machine based on signals generated by the travel speed sensor and the at least one traction device speed sensor, and determine a torque output value of the mobile machine. The control may also be configured to make a comparison of the slip value and the torque output value with a pull-slip curve stored in memory, and selectively update the pull-slip curve based on the comparison.

An organic light emitting diode (OLED) display a includes: a substrate; an organic light emitting element on the substrate and including a first electrode, a light emission layer, and a second electrode; and an encapsulation layer on the substrate while covering the organic light emitting element. The encapsulation layer includes an organic layer and an inorganic layer. A mixed area, where organic materials forming the organic layer and inorganic materials forming the inorganic layer co-exist along a plane direction of the encapsulation layer, is formed at the boundary between the organic layer and the inorganic layer.

Provided is a novel coated phosphor capable of effectively suppressing the adverse effects of hydrogen sulfide gas generated by the reaction between a sulfur-containing phosphor and moisture in the air. Provided is a sulfur-containing phosphor having a configuration in which ZnO compound containing Zn and O is present on the surface of a sulfur-containing phosphor having a host material which includes sulfur.

A suspension system for a vehicle includes a frame mounting bracket for mounting to the vehicle. The suspension includes front and rear rubber torsion axle assemblies. Front and rear lever assemblies are respectively pivotally attached to the vehicle at front and rear lever pivot points. Outer housings of the rubber torsion axle assemblies are each respectively rigidly mounted to the front and rear lever assemblies. A rigid control arm is pivotally connected at one end to the front lever assembly at a front control arm pivot point and its other end is pivotally connected to the rear lever assembly at a rear control arm pivot point. When the suspension assembly encounters a force causing the front lever assembly to rotate in one direction about the front lever pivot point the rigid control arm causes the rear lever assembly to rotate about the rear lever pivot in an opposite direction.

Interior panels having integrated airbag doors for motor vehicles and methods for making such interior panels are provided herein. In one example, an interior panel comprises a substrate having outer and inner surfaces and an opening extending therethrough. A multi-shot injection molded airbag chute-door assembly is mounted to the substrate and comprises a chute wall that at least partially surrounds an interior space. A door flap portion is pivotally connected to the chute wall and at least partially covers the opening. A perimeter flange extends from the chute wall and has a flange section that overlies the outer surface of the substrate. A molded-in lip feature extends from the flange section and contacts the outer surface to form a seal between the flange section and the substrate. A skin covering extends over the substrate and a foam is disposed between the skin covering and the substrate.

In some example embodiments, a system includes a drill string having a drill bit. The drill string extends through at least part of a well bore. The system also includes a first vibrational sensor, positioned on the drill bit to measure, at a first location on the drill string, an amplitude of one or more of an axial vibration and a lateral vibration. The system also includes a second vibrational sensor, positioned above the drill bit and on the drill string. The second vibration sensor is to measure, at a second location on the drill string, one or more of an axial vibration and a lateral vibration. The system includes a processor unit to determine a type of vibration based on a comparison of the amplitude at the first location to the amplitude at the second location, wherein the type of vibration is at least one of bit whirl of the drill bit and a while of a bottom hole assembly that is part of the drill string.