A method of making shaped abrasive particles including forming an abrasive flake comprising a plurality of precursor shaped abrasive particles and a frangible support joining the precursor shaped abrasive particles together; transporting the abrasive flake through a rotary kiln to sinter the abrasive flake; and breaking the sintered abrasive flake into individual shaped abrasive particles. The method is useful to make small shaped abrasive particles having insufficient mass to be efficiently individually sintered in a rotary kiln without joining two or more of the shaped abrasive particles together.

A method and system for estimating uncertainties in radar based precipitation estimates is provided. In an embodiment, gauge measurements at one or more gauge locations are received by an agricultural intelligence computer system. The agricultural intelligence computer system obtains precipitation estimates for the one or more gauge locations that correspond to the gauge measurements and computes the differences between the precipitation estimates and the gauge measurements. Using the precipitation estimates and the computed differences, the agricultural intelligence computer system then models a dependence of the uncertainty in the precipitation estimates on the value of the precipitation estimates. When the agricultural intelligence computer system receives precipitation estimates for a location where gauge measurements are unavailable, the agricultural intelligence computer identifies an uncertainty for the precipitation estimate based on the value of the precipitation estimate and the model of the dependence of the uncertainty on the precipitation estimate values.

An integrated circuit (IC) of a frequency-modulated continuous wave (FMCW) coded aperture radar (CAR) configured to step through a range of frequencies in each sweep and a method of assembling the FMCW CAR are described. The IC includes an antenna element to transmit and receive at a given time duration, a transmit channel to process a signal for transmission, the transmit channel including a transmit switch to change a state of a transmit phase shifter between two states based on a first code, and a receive channel to process a received signal, the receive channel including a receive switch to change a state of a receive phase shifter between two states based on a second code. The IC also includes a switch controller to control the first code and the second code, wherein the switch controller controls the first code to remain constant within the sweep.

A blind spot detection system for a motorcycle, which includes an accelerometer, a gyroscope, and a detection device for detecting the presence of a vehicle in at least one blind spot. The accelerometer detects a gravity force vector, and the gyroscope detects the position of the motorcycle relative to the gravity force vector such that a lean angle of the motorcycle is calculated. The detection device is then configured to maintain the same position of the motorcycle relative to the gravity force vector and compensate for the position of the motorcycle if the lean angle is greater or less than 90°, such that the detection device is able to detect the presence of the vehicle in the at least one blind spot, independent of the lean angle of the motorcycle.

Various methods, apparatus, devices and systems are provided for electrically short antennas for efficient broadband transmission. In one example, among others, a system includes a segmentally time-variant antenna and a segment controller that can control conductivity of individual segments of the segmentally time-variant antenna. The conductivity of the individual segments is modulated to allow a pulse to propagate from the proximal end to the distal end of the segmentally time-variant antenna and impede a reflection of the pulse from propagating back to the proximal end of the segmentally time-variant antenna. In another embodiment, a method includes injecting a pulse at a first end of a segmentally time-variant antenna and modulating conductivity of individual segments to allow the pulse to propagate to a second end of the segmentally time-variant antenna and impede a reflection of the pulse from propagating back to the first end.

A vertical planting tray comprising a plurality of substantially horizontal shelves held together by outer side walls and a plurality of vertical struts located therebetween with the struts connected to and supporting the shelves, the struts being substantially thin and narrow an defining a plurality of planting stations with the horizontal shelves in which vertical plants may be grown. The substantial open wall structure between stations permits improved plant performance.

A system for efficient transportation and display of plants or flowers has been designed that contains two or more trays and a container. The first tray and alternative tray house the plants or flowers. The second tray, in which the first tray and alternative tray nest, allows for easy movement of the first tray, the alternative tray and the supply of water or nutrients. The container is designed to serve two functions, shipping and displaying.

A composite particle and a population of particles comprising a water-insoluble polyphosphate composition, methods of producing, and methods of using the same are provided. The polyphosphate composition may comprise at least one alkaline earth metal selected from calcium and magnesium and optionally at least one nutrient ion selected from the group consisting of potassium, ammonium, zinc, iron, manganese, copper, boron, chlorine, iodine, molybdenum, selenium or sulfur.

The present invention is directed to device and method for promoting plant growth. The device is a plant spacing member that has a body and a first end and a second end. The first end and second end have openings for receiving at least one plant limb therein to create a space between the limbs of the plant. An increased flow of air and light then flow through the created space to the interior of the plant to stimulate the growth of the plant. In addition, the increase flow of air and light dries the plant to reduce the accumulation of mold and mildew.

Method and apparatus for growing plants in vertical stacks by providing vertically stacked, interconnected pairs of plant platforms and light trays carrying growth promoting light sources. Each light tray is suspended below the underside of the next above plant platform. The stack is vertically raised in succession whereby the plant platforms are suspended and vertically spaced from each other. Thereafter, plants are placed between suspended platforms under the light trays which are regulating during periods of plant growth and non-growth.

Embodiments are described for a closed-loop, vertical garden system for growing plants and filtering air and water comprising: a support structure; a composite, grow media configured to physically support the growth of plants and distribute water to the roots of the plants through capillary action through the area of the grow media; a water source coupled to the grow media through a pump and plumbing system, wherein the plumbing system is configured to draw water from the water source through the grow media and back to the water source in substantially closed loop aquatic system; and an air flow subsystem configured to draw outside air through the plants and transmit filtered air back out of the support structure.

A fluid dispensing device comprises a housing body, a fluid container, a reciprocating piston fluid pump, a primary drive element and a spray tip. The housing body is configured to be carried and supported by an operator of the hand held airless fluid dispensing device during operation. The fluid container is supported by the housing body. The reciprocating piston fluid pump is coupled to the housing body and comprises at least two pumping chambers configured to be actuated out of phase by at least one piston. The primary drive element is coupled to the housing body and connected to the reciprocating piston fluid pump to actuate the at least one piston. The spray tip is connected to an outlet of at least one of the pumping chambers.

The present disclosure provides a system and method articulating and rotary spray system for fluids that includes a first drive for rotating a mast for different headings and a second drive for rotating a nozzle for different pitches at any time with or without rotation of the mast. The method and system uses a system of interacting gears that rotate a control rod in variable synchronization to control the nozzle pitch relative to the mast heading while the control rod orbits about a center of rotation of the rotating mast along a longitudinal axis.

A cutlery kit configured from a laminar sheet which manifests its previous use through the detachment of its parts. The kit is comprised of two or more daily, known utensils selected from a spoon, a fork and a knife, which are jointly located in a single plane and are separated by thin, continuous dotted or cut lines. The utensils fit into each other in a complementary form, counter-form way and remain joined together by the presence of continuities in the surface where these continuities interrupt the dotted lines. Each of these cutlery utensils is detached from the others through breaking, done by the user, of these continuities on the surface.

A pocket knife including a first body portion including a first engaging member, and a second body portion including a second engaging member arranged to engage the first body portion with the second body portion. The first body portion and the second body portion are separated from each other when not engaged. A tool element is arranged to be housed in the first body portion when in a closed state and displaced outward when in an opened state. A first locking member is arranged to be actuated by the tool element, and cooperates with a second locking member provided on the second body portion, and wherein when the first engaging member is engaged with the second engaging member, and when the first locking member and the second locking member are prevented from moving, the first body portion and the second body portion are prevented from being separated.

An amino-containing silica particle is provided. The amino-containing silica particle is obtained by hydrolysis-condensation reaction of an alkoxy silane represented by formula (I), an alkoxy silane represented by formula (II) and a catalyst: Si(OR1)4 formula (I) (NH2—Y)m—Si(OR2)4-m formula (II) wherein in formula (I), R1 is a C1-C10 alkyl group, and in formula (II), Y is a C1-C10 alkyl group or a C2-C10 alkenyl group, R2 is a C1-C10 alkyl group, and m is an integer of 1 to 3.

A method for protecting a surface of an article from sulfate corrosion resulting from exposure to a sulfate containing material at an elevated temperature includes coating the surface with a nickel based material to form an anti-corrosion coating. The nickel based material includes NiO, a spinel of formulation AB2O4, or a combination thereof, wherein A includes nickel, and B includes iron or a combination of manganese and a B site dopant.

A sheet material includes a fibrous substrate made of microfibers and a hydrophilic-group-containing resin applied to the fibrous substrate. The hydrophilic-group-containing resin has a microphase-separated structure that satisfies Condition I: In a phase image obtained by observing an area of 1 μm2 in a cross-section of the hydrophilic-group-containing resin applied to the fibrous substrate by phase imaging using an atomic force microscope (AFM), a standard deviation of a mode of brightness distribution of areas of 0.2 μm2 in the area of 1 μm2 is from 0 to 10. Provided are a sheet material that is produced through an eco-conscious production process and yet has such uniformity that is comparable to those of man-made leathers produced using organic-solvent-based polyurethanes, an elegant surface appearance, and a good touch, and a method for producing such a sheet material.

The present invention provides an artificial leather including an entangled fiber mass of ultrafine fibers having a monofilament fineness of 0.01 dtex or more and 0.50 dtex or less and a polymeric elastomer; wherein at least one surface is napped; the cross-sectional profile curve of the napped surface has an arithmetic mean height Pa of 26 μm or more and 100 μm or less; the arithmetic mean height Pa of the cross-sectional profile curve of the opposite surface is 20% or more and 80% or less of the cross-sectional roughness Pa of the napped side; the existence frequency of asperity peaks found in the cross-sectional profile curve of the napped surface is 1.8 or more and 20 or less per 1.0 mm; and a woven or knitted fabric lamination is present near the opposite surface at a depth position of 10% or more and 50% or less.

Provided is an elastic infill for artificial turf. The elastic infill is produced by pelletization of an elastomer composition comprising a silane coupling agent and a mixture of an olefin copolymer-containing base resin and an inorganic filler. The silane coupling agent is present in admixture with the mixture. Alternatively, the silane coupling agent may be grafted onto the olefin copolymer to allow cross-linking of the olefin copolymer in the presence of water.

A laminate including a radio wave permeable member having a radio wave permeability; and a heat conducting member having an electromagnetic wave shielding property and/or a rigidity retaining member having an electromagnetic wave shielding property in the thickness direction of the radio wave permeable member; wherein the laminate has a radio wave permeable area solely constituted from the radio wave permeable member as a part of the laminate, and the radio wave permeable area is a thin area; and an integrally molded article using such laminate.

Provided is a method for manufacturing magnetic particles, in which an oxidation treatment, a reduction treatment, and a nitriding treatment are performed in that order on raw material particles with a core-shell structure in which a silicon oxide layer is formed on the surfaces of iron microparticles, thereby nitriding the iron microparticles while maintaining the core-shell structure. Due to this configuration, granular magnetic particles with a core-shell structure in which a silicon oxide layer is formed on the surfaces of iron nitride microparticles can be obtained.

A sintered magnet body (RaT1bMcBd) coated with a powder mixture of an intermetallic compound (R1iM1j, R1xT2yM1z, R1iM1jHk), alloy (M1dM2e) or metal (M1) powder and a rare earth (R2) oxide is diffusion treated. The R2 oxide is partially reduced during the diffusion treatment, so a significant amount of R2 can be introduced near interfaces of primary phase grains within the magnet through the passages in the form of grain boundaries. The coercive force is increased while minimizing a decline of remanence.

An apparatus for providing a target for a projectile comprises an elongate member extending between first and second ends, sized to span a playing surface. The apparatus further comprises first and second support legs extending from the first and second ends of the elongate member, each of the first and second support legs having a length selected to position the elongate member above and outside of a possible path of the projectile and a plurality of lights located on the elongate member selectable by a user to provide a visual target for a user. After the elongate member is positioned above and outside a possible path of the projectile a desired path for the projectile is selected and one of a plurality of lights on the elongate member to provide a visual target for a user expected to produce the desired path in the projectile is illuminated.

Card-reading shoes may include an input area configured to support cards therein. A card-reading system may be located within the card-reading shoe, the card-reading system including at least one sensor configured to detect at least a rank and suit of each card processed by the card-reading shoe. A toggle weight may be pivotally mounted proximate an output end of the shoe. The toggle weight may be configured to selectively rotate to enable cards to be removed from the card-reading shoe via the output end and to selectively remain stationary to prevent removed cards from being reinserted into the card-reading shoe via the output end. The card-reading shoes may optionally include a removable cartridge including a delivery end configured to enable manual removal of cards from the removable cartridge when the removable cartridge is removed from the input area.

The present invention board relates to a game system using a portable terminals and a game board therefor. According to the present invention, there is provided a board game system, including: one or more pieces configured to correspond to respective game players; a game board configured to display a path through which the pieces move, and to detect a changed location of each of the pieces on the path; and one or more personal portable terminals each configured to check the changed location of the piece detected by the game board while communicating with the game board, and to output information about operations, which will be performed by each of the game players, or options, which can be selected by each of the game players based on a location of one of the pieces corresponding to each of the game players.

A network connection framework for connecting a dartboard to a portable device includes: a cloud server; a communication device communicating with the cloud server via a communication network; a dartboard including a dartboard unit, a sensing unit and a dartboard wireless communication unit which connects the dartboard to the cloud server via wireless signal, the dartboard wireless communication unit serves to receive and transmit the score signal to the could server; and a portable device with a portable device wireless communication device which connects the portable device to the cloud server via wireless signal. When the user registration information is inputted in the portable device, the score corresponding to the score signal will be displayed. Therefore, the dart game can be played by players in different venues, and consequently is not restricted by the number of the players and the size and location of the venue.

What is disclosed is a mobile freewheeling playing card cart. The cart has a tray positioned upon a rolling base that is capable of holding two or more stacks of playing cards. The tray features barriers and depressions around the card stacks that make the cards more easily accessible. The cart includes one or more handles used to maneuver the cart. The cart may be motorized through the use of an integrated battery and remote control.

Disclosed is a dart game apparatus according to an embodiment of the present invention in order to implement the aforementioned object. The dart game apparatus includes: a dart target having a plurality of score areas; a sensing module configured to sense an electrical signal changed as a dart pin hits the dart target; a controller configured to control an overall operation of the dart game apparatus; and a camera module configured to include a plurality of camera units, wherein the camera module includes a first camera unit configured to photograph a throw line which is a location where a player throws a dart and a whole body of the player, a second camera unit configured to photograph at least a part of a body for identifying the player, a third camera unit configured to photograph the entirety of the dart target, and a fourth camera unit configured to photograph at least a partial area in an area formed between the throw line and the dart game apparatus in order to photograph a blind zone which is not photographed by the first camera unit, the second camera unit, and the third camera unit.

A tip insert for a cue shaft having a cavity at the tip has a tip disc to support a tip for striking a ball and an inwardly extending section for bonding to the inside surface of the cavity. The inwardly extending section includes one or more centering flanges and a bonding surface, the centering flanges interfacing with the inner surface of the cavity and enabling a substantially consistence bond distance between the bonding surface and the inner surface of the cavity. The tip insert can be machine from a single piece of material comprising glass fiber-reinforced epoxy laminate sheets, where the individual sheets of the material are oriented perpendicular to the longitude axis of the tip insert to increase the durability and performance of the tip insert when transferring the force from the tip striking a ball.

An outer plastic tube has water connections through the wall into an annular space defined by an O-ring spacer-gasket positioned between the wall and the perimeter margin of an inner cylinder rolled from a single-layer of sheet metal. A metal drainpipe with a removable bullet-shape at one end is forced through the cylinder to expand it and to thereby compress the gasket sealing the annular space. Thermal contact conductance is increased by the compressive force of water pressure. Water flow through the heat exchanger is both annular and turbulent to optimize heat transfer.

In a cooled component system, a heat exchanger mounted on a surface of the industrial component is housed in an isolated access compartment adjacent to but separated from the primary compartment containing the industrial component. Housing the heat exchanger in a separately accessible compartment permits access to the heat exchanger for cleaning or other purposes without having to shut down the industrial component being cooled. A means for moving a cooling media over the surface a the heat exchanger might also be included to maximize heat exchange.

A digital down converter with an equalizer translates an ADC output signal to a low frequency spectral region, followed by decimation. All operations of correction of the processed signal are carried out with a reduced sampling rate compared with sampling rates of the prior art. Equalization is performed only in a frequency pass band of the down converter. The achieved reduction of the required computation resources is sufficient to enable the down converter with equalization to operate in a real time mode.

A circuit includes a time delta detector configured to receive an input clock signal and a reference clock signal and generate a delta pulse signal and a reference pulse signal. A comparison circuit is configured to receive the delta pulse signal and the reference pulse signal. The comparison circuit generates an output indicative of a bit of a time difference between the input clock signal and the reference clock signal. A control circuit is configured to receive the output from the comparison circuit. The control circuit maintains a count of the time difference between the input clock signal and the reference clock signal.

A level shifter circuit includes a level shifting unit configured to receive signals that may vary in a first range via a positive input terminal and a negative input terminal, respectively and to output signals that may vary in a second range to a positive output terminal and a negative output terminal, respectively, where the second range is larger than the first range, a first pre-charging unit configured to pre-charge the positive output terminal to a predetermined level when a clock is in a first level, and a second pre-charging unit configured to pre-charge the negative output terminal to the predetermined level when the clock is in the first level.

An input buffer for an ADC is provided. The input buffer includes a receiving circuit and an impedance circuit. The receiving circuit is coupled between a power supply and a sample-and-hold circuit of the ADC, and receives an analog input signal and generating an analog signal. The impedance circuit is coupled to the receiving circuit, and selectively provides a variable impedance. When the sample-and-hold circuit of the ADC is operated in a first phase, the impedance circuit provides a small impedance, and when the sample-and-hold circuit of the ADC is operated in a second phase, the impedance circuit provides a large impedance.

A digital-to-analog converter (DAC) and a high-voltage tolerance circuit are provided. The DAC includes a high-voltage tolerance circuit. The high-voltage tolerance circuit is configured to generate a reference voltage, and select the reference voltage or a first power-source voltage to control the node voltage of each branch of an operational amplifier circuit of the high-voltage tolerance circuit according the logical signal level of an input signal.

An ultrasound device including an asynchronous successive approximation analog-to-digital converter and method are provided. The device includes at least one ultrasonic transducer, a plurality of asynchronous successive-approximation-register (SAR) analog-to-digital converters (ADC) coupled to the at least one ultrasonic transducer, at least one asynchronous SAR in the plurality having a sample and hold stage, a digital-to-analog converter (DAC), a comparator, and control circuitry, wherein a DAC update event following at least one bit conversion is synchronized to a corresponding DAC update event of at least one other ADC in the plurality of ADCs.

Methods and systems for time interleaved analog-to-digital converter timing mismatch calibration and compensation may include receiving an analog signal on a chip, converting the analog signal to a digital signal utilizing a time interleaved analog-to-digital-converter (ADC), and reducing a blocker signal that is generated by timing offsets in the time interleaved ADC by estimating complex coupling coefficients between a desired digital output signal and the blocker signal utilizing a decorrelation algorithm on frequencies within a desired frequency bandwidth. The decorrelation algorithm may comprise a symmetric adaptive decorrelation algorithm. The received analog signal may be generated by a calibration tone generator on the chip. An aliased signal may be summed with an output signal from a multiplier. The complex coupling coefficients may be determined utilizing the decorrelation algorithm on the summed signals. A multiplier may be configured to cancel the blocker signal utilizing the determined complex coupling coefficients.

A hybrid SAR-ADC that uses a combination of voltage-based signal processing and time-based signal processing to convert an analog input signal to a digital output signal is disclosed. In some embodiments, the hybrid SAR-ADC has a voltage-based signal processing element configured to convert an analog input signal to a first digital signal having a plurality of MSBs and to generate a residue voltage from an input voltage and the first digital signal. A voltage-to-time conversion element is configured to convert the residue voltage to a time domain representation. A time-based signal processing element is configured to convert the time domain representation to a second digital signal comprising a plurality of LSBs. By determining the plurality of MSBs using voltage-based signal processing and determining the plurality of LSBs using time-based signal processing, the hybrid SAR-ADC is able to achieve low power and compact area.

A converter includes: a terminal that receives code-modulated power that has been generated with a modulation code; and a circuit that intermittently converts the code-modulated power with a conversion code based on the modulation code. The code-modulated power is alternating-current power.

Typically, complex systems require a separate and expensive equalizer at the output of an analog-to-digital converter (ADC). Rather than providing a separate equalizer, the effective Signal Transfer Function (STF) of a Multi-stAge noise SHaping (MASH) ADC can be modified by leveraging available digital filtering hardware necessary for quantization noise cancellation. The modification can involves adding calculations in the software previously provided for computing digital quantization noise cancellation filter coefficients, where the calculations are added to take into account equalization as well. As a result, the signal transfer function can be modified to meet ADC or system-level signal-chain specifications without additional equalization hardware. The method is especially attractive for high-speed applications where magnitude and phase responses are more challenging to meet.

An analog-to-digital converter (ADC) is a device that can include a reference shuffler and a loop filter. An ADC can achieve better performance with incremental adjustment of a pointer of the reference shuffler, changing coefficients of the loop filter, and storing calibration codes of the ADC in a non-volatile memory. By incrementally adjusting a pointer of the reference shuffler, a calibration can be performed more efficiently than with a random adjustment of the pointer. By temporarily changing the loop filter coefficients, a greater amount of activity can be introduced into the loop filter. This activity can allow the calibration to proceed more efficiently. By storing the calibration codes in a non-volatile memory, a search space for calibration codes can be reduced. Thus, a calibration can occur more quickly, and the calibration itself can be improved.

An analog to digital converter includes an error integration circuit configured to receive an input charge from a detector and to integrate a difference between the input charge and one or more feedback charge pulses to create an error voltage. A quantizer is in operable communication with the error integration circuit and is responsive to the created error voltage. An accumulator having a mantissa component and a radix component is in operable communication with the quantizer. A charge feedback device in operable communication with the quantizer and the radix component of the accumulator. The charge feedback device is configured to generate the one or more feedback charge pulses proportional to the radix component of the accumulator and an output of the quantizer. Digital focal plane read out integrated circuits including the analog to digital converter are also disclosed.

The disclosure relates to a circuit for stabilizing a digital-to-analog converter reference voltage. One example embodiment is a circuit for stabilizing a voltage on a reference node. The circuit includes a digital-to-analog converter that includes an array of capacitors and arranged for: receiving an input voltage via an input node, receiving a voltage via a reference node and a digital-to-analog code via a controller node, and outputting a digital-to-analog output voltage. The circuit also includes a capacitive network on the reference node comprising a fixed capacitor arranged to be pre-charged to an external reference voltage and a variable capacitor arranged to be pre-charged to an external auxiliary voltage. Further, the circuit includes a measurement block. In addition, the circuit includes a calibration block arranged for determining an updated setting of the variable capacitor based on the digital-to-analog code and the measured voltage on the reference node.

A circuit and a method for converting an analog signal to a digital value representation is disclosed. In one aspect, the circuit includes an incremental sigma-delta analog-to-digital converter (ADC). The circuit further includes a first input line for providing a primary analog signal representing a sensor measurement to the incremental sigma-delta ADC. The circuit further includes a second input line for providing a secondary analog signal to the incremental sigma-delta ADC. The incremental sigma-delta ADC receives the primary and secondary analog signals during a first period (TADC1) and a second period (TADC2), respectively. The circuit further includes a filter configured to weight the digital values in a sequence of digital values output by the incremental sigma-delta ADC, and to output a single digital value representing the sensor measurement.

System and methods for input path matching in pipelined continuous-time Analog-to Digital Converters (ADCs), including pipelined Continuous-Time Delta Sigma Modulator (CTDSM) based ADCs, includes an input delay circuit disposed in a continuous-time input path from an input of an analog input signal to a first summing circuit of the continuous-time ADC. At least one digital delay line is disposed between an output of an earlier stage sub-ADC (of a plurality of pipelined sub-ADCs) and a sub-digital-to-analog converter (DAC) that is coupled to the first summing circuit, and between the earlier stage sub-ADC and a digital noise cancellation filter. The digital delay line(s) is configured to enable calibration of delay of output of the earlier stage sub-ADC provided to the sub-DAC and the digital noise cancellation filter in accordance with process variations of the input delay match circuit to minimize residue output at first summing circuit.

A method of producing a titanium dioxide pigment is provided. Also provided is a method of improving the processability of titanium dioxide particles without adversely affecting the rheological properties of the titanium dioxide particles.

The present invention relates to a process for the preparation of articles of manufacture made of or based on sulphur, which comprises cooling of liquid sulphur in a volume of containment until the sulphur mass solidifies and forming of the product, characterized in that elastic pressure waves are applied to the cooling mass of liquid sulphur to produce a crystalline suspension of solid sulphur in liquid sulphur.

Titanium dioxide which includes particles having a large major-axis length in a large proportion and comprises columnar particles having a satisfactory particle size distribution. A titanium compound, an alkali metal compound, and an oxyphosphorus compound are heated/fired in the presence of titanium dioxide nucleus crystals having an aspect ratio of 2 or higher to grow the titanium dioxide nucleus crystals. Subsequently, a titanium compound, an alkali metal compound, and an oxyphosphorus compound are further added and heated/fired in the presence of the grown titanium dioxide nucleus crystals. Thus, titanium dioxide is produced which comprises columnar particles having a weight-average major-axis length of 7.0-15.0 μm and in which particles having a major-axis length of 10 μm or longer account for 15 wt. % or more of all the particles.