The present invention provides a method for fabricating a working electrode. The method comprises the following steps: providing a photoelectrode, which comprises a conductive substrate with a semiconductor material; providing a dye solution, which comprises a dye dissolved in a solvent; and applying a voltage for conducting an electrophoresis to adsorb said dye onto a surface of said semiconductor material. The method of present invention makes the dye adsorbed fast to a surface of a semiconductor material by electrophoresis, and therefore, significantly reduces the time for fabricating a dye-sensitized solar cell.

A metal material is provided with a bismuth coating which enables the subsequent coating to be accomplished at a high throwing power, and has excellent corrosion resistance, coating adhesion and is able to be produced with reduced damage to the environment. The metal material has a surface and a bismuth-containing layer deposited on at least a part of the surface of the metal material, wherein the percentage of bismuth atoms in the number of atoms in the surface layer of the metal material with a bismuth coating is at least 10%.

A biological sample measuring device including a mounting portion to which a biological sample measuring sensor is mounted, a voltage application section that applies voltage to a counter electrode of the biological sample measuring sensor mounted to the mounting portion, amplifiers that are selectively connected to a working electrode of the biological sample measuring sensor, and a determination section that is connected to these amplifiers. The determination section has a threshold determination section that determines a voltage value obtained by voltage conversion of the current value of the working electrode, a same determination section that selectively connects the amplifiers to the working electrode depending on the determination of the threshold determination section, and identifies the sample deposited on the biological sample measuring sensor from the output of the selected amplifier, and an output section that outputs a measurement value corresponding to the identified sample.

In one embodiment, a turf aerator includes a frame having wheels, a variable displacement pump, an engine for driving at least one of the wheels and driving the pump, a tine assembly supported by the frame and being movable between lowered and raised configurations, and a swash-plate-adjustment linkage extending from the tine assembly to the pump. The tine assembly includes: a base; a hydraulic motor in hydraulic communication with the pump; rotatable cranks powered by the hydraulic motor; a downwardly-extending arm rotatably coupled to each crank; a tine extending downwardly from each downwardly-extending arm; springs operatively anchored to the base; and a guide arm extending between each downwardly-extending arm and a respective spring. The swash-plate-adjustment linkage automatically adjusts the pump with movement of the tine assembly relative to the frame to provide output to the hydraulic motor substantially only when the tine assembly is at the lowered configuration.

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.

A cleanup device having a first board having a first edge, a second board having a first edge, a first hinge attached to the first edge of the first board and the first edge of the second board, an aperture defined by a portion of the first edge of the first board and a portion of the first edge of the second board, a first plate slidably attached to the first board, wherein the first plate is movable from a first, open position where the aperture is open to a second, closed position where the first plate extends over at least a portion of the aperture, and wherein a top surface of the first board is movable towards a top surface of the second board to form a V-shaped surface for directing dirt or soil off of the first board and the second board.

According to embodiments of the invention, a TFT array substrate, a manufacturing method of the TFT array substrate and a display device are provided. The method comprises: depositing a metal film on a substrate, and forming a gate electrode and a gate line; forming a gate insulating layer and a passivation layer on the substrate; depositing a transparent conductive layer, a first source/drain metal layer and a first ohmic contact layer, and forming a drain electrode, a pixel electrode, a data line, and a first ohmic contact layer pattern provided on the drain electrode; and depositing a semiconductor layer, a second ohmic contact layer and a second source/drain metal layer, and forming a source electrode, a second ohmic contact layer pattern provided below the source electrode, and a semiconductor channel between the source electrode and the drain electrode.

An organic light emitting display device includes a light shield layer formed on a substrate and a buffer layer formed on an entire surface of the substrate, an oxide semiconductor layer and first electrode formed on the buffer layer, a gate insulation film and gate electrode formed on the oxide semiconductor layer while being deposited to expose both edges of the oxide semiconductor layer, an interlayer insulation film formed to expose both the exposed edges of the oxide semiconductor layer and the first electrode, source and drain electrodes connected with one edge and the other edge of the oxide semiconductor layer, respectively, and a protective film formed to cover the source and drain electrodes while exposing a region of the first electrode so as to define a luminescent region and a non-luminescent region.

A display device includes a pixel portion including a plurality of pixels each including a first transistor, a second transistor, and a light-emitting element, in which a gate of the first transistor is electrically connected to a scan line, one of a source and a drain of the first transistor is electrically connected to a signal line, and the other of them is electrically connected to a gate of the second transistor; one of a source and a drain of the second transistor is electrically connected to a power supply line and the other of them is electrically connected to the light-emitting element, and the first transistor includes an oxide semiconductor layer. A period when the display device displays a still image includes a period in which output of a signal to all the scan lines in the pixel portion is stopped.

An object is to manufacture a semiconductor device with high reliability by providing the semiconductor device including an oxide semiconductor with stable electric characteristics. In a transistor including an oxide semiconductor layer, a gallium oxide film is used for a gate insulating layer and made in contact with an oxide semiconductor layer. Further, gallium oxide films are provided so as to sandwich the oxide semiconductor layer, whereby reliability is increased. Furthermore, the gate insulating layer may have a stacked structure of a gallium oxide film and a hafnium oxide film.

The band tail state and defects in the band gap are reduced as much as possible, whereby optical absorption of energy which is in the vicinity of the band gap or less than or equal to the band gap is reduced. In that case, not by merely optimizing conditions of manufacturing an oxide semiconductor film, but by making an oxide semiconductor to be a substantially intrinsic semiconductor or extremely close to an intrinsic semiconductor, defects on which irradiation light acts are reduced and the effect of light irradiation is reduced essentially. That is, even in the case where light with a wavelength of 350 nm is delivered at 1×1013 photons/cm2·sec, a channel region of a transistor is formed using an oxide semiconductor, in which the absolute value of the amount of the variation in the threshold voltage is less than or equal to 0.65 V.

A light emitting device including a light emitting structure having a first conduction type semiconductor layer, an active layer, and a second conduction type semiconductor layer, a transparent conductive layer disposed on the light emitting structure, a metal filter having an irregular pattern disposed between the light emitting structure and the transparent conductive layer, and openings disposed between the irregular patterns in the metal filter.

An electronic device includes a silicon carbide layer including an n-type drift region therein, a contact forming a junction, such as a Schottky junction, with the drift region, and a p-type junction barrier region on the silicon carbide layer. The p-type junction barrier region includes a p-type polysilicon region forming a P-N heterojunction with the drift region, and the p-type junction barrier region is electrically connected to the contact. Related methods are also disclosed.

An object is to provide a semiconductor device including an oxide semiconductor film, which has stable electrical characteristics and high reliability. A stack of first and second material films is formed by forming the first material film (a film having a hexagonal crystal structure) having a thickness of 1 nm to 10 nm over an insulating surface and forming the second material film having a hexagonal crystal structure (a crystalline oxide semiconductor film) using the first material film as a nucleus. As the first material film, a material film having a wurtzite crystal structure (e.g., gallium nitride or aluminum nitride) or a material film having a corundum crystal structure (α-Al2O3, α-Ga2O3, In2O3, Ti2O3, V2O3, Cr2O3, or α-Fe2O3) is used.

Semiconductor devices including a stressor in a recess and methods of forming the semiconductor devices are provided. The methods may include forming a trench in an active region and the trench may include a notched portion of the active region. The methods may also include forming an embedded stressor in the trench. The embedded stressor may include a lower semiconductor layer and an upper semiconductor layer, which has a width narrower than a width of the lower semiconductor layer. A side of the upper semiconductor layer may not be aligned with a side of the lower semiconductor layer and an uppermost surface of the upper semiconductor layer may be higher than an uppermost surface of the active region.

It is an object to manufacture a highly reliable semiconductor device including a thin film transistor whose electric characteristics are stable. An insulating layer which covers an oxide semiconductor layer of the thin film transistor contains a boron element or an aluminum element. The insulating layer containing a boron element or an aluminum element is formed by a sputtering method using a silicon target or a silicon oxide target containing a boron element or an aluminum element. Alternatively, an insulating layer containing an antimony (Sb) element or a phosphorus (P) element instead of a boron element covers the oxide semiconductor layer of the thin film transistor.

To provide a semiconductor device which has transistor characteristics with little variation and includes an oxide semiconductor. The semiconductor device includes an insulating film over a conductive film and an oxide semiconductor film over the insulating film. The oxide semiconductor film includes a first oxide semiconductor layer, a second oxide semiconductor layer over the first oxide semiconductor layer, and a third oxide semiconductor layer over the second oxide semiconductor layer. The energy level of a bottom of a conduction band of the second oxide semiconductor layer is lower than those of the first and third oxide semiconductor layers. An end portion of the second oxide semiconductor layer is positioned on an inner side than an end portion of the first oxide semiconductor layer.

An object is to manufacture and provide a highly reliable semiconductor device including a thin film transistor with stable electric characteristics. In a method for manufacturing a semiconductor device including a thin film transistor in which a semiconductor layer including a channel formation region serves as an oxide semiconductor film, heat treatment for reducing impurities such as moisture (heat treatment for dehydration or dehydrogenation) is performed after an oxide insulating film serving as a protective film is formed in contact with an oxide semiconductor layer. Then, the impurities such as moisture, which exist not only in a source electrode layer, in a drain electrode layer, in a gate insulating layer, and in the oxide semiconductor layer but also at interfaces between the oxide semiconductor film and upper and lower films which are in contact with the oxide semiconductor layer, are reduced.

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 one aspect, an apparatus for drilling a wellbore into an earth formation is disclosed, which apparatus, according to one embodiment, may include a drill string configured to be conveyed into a wellbore, wherein an annulus is formed between the drill string and a wellbore wall, a first flow device configured to circulate a first fluid from an annulus to a bore of the drill string, and a second flow device positioned downhole of the first flow device, the second flow device configured to circulate a second fluid from the bore of the drill string to the annulus.

Nozzles for drilling tools, such as rotary-type drag bits and roller cone bits, a drilling tool and drilling assembly comprising nozzles, and methods of conveying drilling fluid through a nozzle for use in drilling subterranean formations are provided. A nozzle may include a substantially cylindrical nozzle body having an axis and an inlet port with a primary passage extending therethrough, and at least one secondary passage that diverges from the primary passage at an exit port.

An airflow-organization testing method for a clean room and a system using the same method are disclosed. The airflow-organization testing method for a clean room uses a thermal imaging device to detect a sample gas-flow formed by a sample gas in the clean room, and the sample gas has a temperature difference from ambient air. The airflow-organization testing system for a clean room includes a sample gas supplier and a thermal imaging device, and the thermal imaging device can continuously detect a spatial position of the sample gas and display it on a display, thereby improving detection precision and expanding detection range.

Image sensors and methods of operating the same. An image sensor includes a pixel array including a plurality of pixels. Each of the plurality of pixels includes a photo sensor, the voltage-current characteristics of which vary according to energy of incident light, and that generates a sense current determined by the energy of the incident light; a reset unit that is activated to generate a reference current, according to a reset signal for resetting at least one of the plurality of pixels; and a conversion unit that converts the sense current and the reference current into a sense voltage and a reference voltage, respectively.

A gasifier comprises an internal chamber, a slag collection region, a slag passageway, a slag breaker, and an actuator. The internal chamber comprises a main combustion region that is configured and adapted to gasify fuel. The slag collection region is located beneath the main combustion region. The slag passageway operatively connects the main combustion region to the slag collection region. The slag breaker comprises a face that is movable relative to the internal chamber. The face is configured and adapted to move within the slag passageway in a manner such that the face contacts and mechanically breaks solidified slag into chunks of solidified slag that then fall into the slag collection region. The actuator is connected to the slag breaker and is configured and adapted to move the face of the slag breaker.

This invention provides a system and method for efficiently and completely combusting oil in mixture with particulate solids. A furnace (kiln) having a feed nozzle with a lead screw drives the mixture from a feed hopper. This nozzle includes forced-air jets/ports at its tip providing makeup air and allowing atomization of the mixture. The nozzle thereby directs the mixture into a rotating combustion chamber that is tilted downwardly from the front toward a solid waste outlet port at the rear. Uncombusted fuel and air backflow to an upper, secondary chamber near the primary chamber front, and are completely combusted at a high temperature. Gasses exit a flue that can include a heat exchanger. This heat exchanger can be operatively connected to a heating device or other mechanism that converts the heat into usable energy. The nozzle can include a cone with axially tilted air ports about its perimeter.

Disclosed is a photovoltaic device. The photovoltaic device includes: a substrate; a first electrode placed on the substrate; a second electrode which is placed opposite to the first electrode and which light is incident on; a first unit cell being placed between the first electrode and the second electrode, and including an intrinsic semiconductor layer including crystalline silicon grains making the surface of the intrinsic semiconductor layer toward the second electrode textured; and a second unit cell placed between the first unit cell and the second electrode.

A resin composition, a multi-layered film, a backsheet for photovoltaic modules, a method thereof, and a photovoltaic module are provided. The multi-layered film including a coating layer including a fluorine-based polymer has an excellent durability and weather resistance, and also exhibits high interfacial adhesive strength to a substrate since the multi-layered film is formed by coating a cured product of the resin composition including the fluorine-based polymer, an acrylic polymer including a thermosetting functional group, and a heat-curing agent on the substrate. In addition, drying can be performed at a low temperature during the manufacture of the multi-layered film so that the manufacturing costs can be decreased, productivity can be increased, and the deterioration of the product due to heat modification, heat shock, and the like, can be prevented. The multi-layered film can be effectively used as a backsheet for various photovoltaic modules.

Disclosed are molecular and polymeric compounds having desirable properties as semiconducting materials. Such compounds can exhibit desirable electronic properties and possess processing advantages including solution-processability and/or good stability.

A layered compound-metal particle composite 3 is obtained by the addition, to an organically modified layered compound 1 formed by the intercalation of organic ions between layers of a layered compound, of both an aqueous colloidal metal solution 2 in which metal particles are dispersed as a metal colloid in water, and a nonaqueous solvent which is a poor solvent for the metal colloid and has an excellent ability to swell the organically modified layered compound 1.

The present disclosure relates to gel-type polymer electrolyte for a dye-sensitized solar cell, a dye-sensitized solar cell comprising the gel-type polymer electrolyte, and a method for manufacturing the dye-sensitized solar cell.

A solar-cell sealant that has excellent properties such as transparency, flexibility, adhesiveness, heat resistance, appearance, cross-linking characteristics, electrical characteristics, and calenderability. A solar-cell sealant that contains an ethylene/α-olefin/unconjugated-polyene copolymer satisfying requirements (a1) through (a3). Requirement (a1) is that constituent units derived from ethylene constitute 80-90 mol %, constituent units derived from C3-20 α-olefin constitute 9.99-19.99 mol %, and constituent units derived from an unconjugated polyene constitute 0.01-5.0 mol % of said copolymer. Requirement (a2) is that the MFR of said copolymer, as measured in accordance with ASTM D1238 at 190° C. under a 2.16 kg load, be at least 2 g/10 min. and less than 10 g/10 min. Requirement (a3) is that the Shore A hardness of said copolymer, as measured in accordance with ASTM D2240, be 60 to 85.

A photovoltaic device including a substrate; a first electrode placed on the substrate; a second electrode which is placed opposite to the first electrode and which light is incident on; a first unit cell being placed between the first electrode and the second electrode, and including an intrinsic semiconductor layer including crystalline silicon grains making the surface of the intrinsic semiconductor layer toward the second electrode textured; and a second unit cell placed between the first unit cell and the second electrode.

A multi-junction solar cell having a Ge or GaAs substrate, as well as a solar cell structure having several subcells deposited on the substrate, the substrate having peripheral side faces, and the solar cell structure having a peripheral circumferential surface, which runs spaced apart from the side faces. To prevent oxidation and penetration of moisture, the circumferential surface of the solar cell structure is coated with a protective, electrically insulating first coating under essential exclusion of the upper surface facing the rays, or that without encroaching on the solar cell structure, the side faces of the substrate are coated with a protective, electrically insulating second coating or that both the side faces of the substrate as well as the circumferential surface of the solar cell structure are coated with a third coating by essential exclusion of the upper surface facing the rays.

According to one embodiment, a tractor comprises a guide shaft, a first belt unit, a second belt unit, a fixing unit and a connecting unit. The first belt unit is supported by the guide shaft so as to move in an axis direction of the guide shaft. The second belt unit is arranged to face the first belt unit in the axis direction of the guide shaft and supported by the guide shaft. The fixing unit, which is movably supported by the guide shaft in the axis direction of the guide shaft and is capable of being fixed on the guide shaft. The connecting unit configured to connect the first belt unit to the fixing unit with a clearance in the axis direction of the guide shaft.

A rail-to-rail comparator including a first comparison unit connected to a first terminal and configured to compare differential input signals to differential reference voltages; a second comparison unit connected to a second terminal and configured to compare the differential input signals to the differential reference voltages; and an output unit configured to be driven in response to a clock signal and to generate a complementary output signal according to comparison results of the first and second comparison units.

A modulation method is provided. The modulation method includes the steps of receiving multiple sinusoidal signals, obtaining the maximum value of the sinusoidal signals, obtaining the median value of the sinusoidal signals, and obtaining the minimum value of the sinusoidal signals within a period to generate a difference between the maximum value and the minimum value, generating a difference according to an upper limit and a lower limit of a predetermined comparison value, and comparing the two differences to generate an optimized modulation signal.

A method for phase modulation of a carrier signal from a transmitter to a contactless transponder in which data is coded as consecutive symbols, each corresponding to a predefined number of carrier cycles, and in which a symbol time is at least two cycles of the carrier signal includes, at the transmitter, spreading a phase jump of a symbol in relation to a preceding symbol over a first part of the symbol time. The establishment of the phase jump is completed in the first part of the symbol time. The periods of the cycles are constant during a second part of the symbol time.

A modulator which has a first terminal to receive a carrier signal, a second terminal to receive a first control signal to control a frequency band of the carrier signal and a third terminal to receive a second control signal to control a modulation depth of the carrier signal.

An arc chute assembly includes a housing having a first wall, a second wall, and a pair of side walls coupled to the first wall. The walls configured to form an arc area. The housing further having a divider wall coupled to the first wall between the side walls. The divider wall configured to form a first sub-arc area, a second sub-arc area, and an arc plate area. The first sub-arc area and the second sub-arc area are configured to be in flow communication with the arc plate area. The arc chute assembly further comprises a support coupled to the first wall and the side walls, and an arc plate coupled to the support. The arc plate having a body extending between the side walls and over the divider wall.

A driver for a switch in a GIS (Gas Insulation Switchgear) includes a motor, a shaft connected with a moving contact of the switch, a gear connected with one terminal of the shaft and configured to transfer power of the motor to cause the shaft to reciprocate the moving contact through the shaft, a cam spline combined with the shaft and spaced apart from the gear, and a micro-switch connected with the cam spline and configured to control an operation of the motor.

Disclosed are a power transmission device for a vacuum interrupter, and a vacuum breaker having the same. The device includes: a driving link coupled to an adjuster; a driven link coupled to a movable electrode of a vacuum interrupter; connection links configured to connect the driving link and the driven link with each other, and coupled to the driving link and the driven link such that an interval between the driving link and the driven link is varied; cams coupled to the connection links in a perpendicular direction; and cam guides having guide recesses for slidably coupling the cams, and configured to guide the interval between the driving link and the driven link to be changed.

Provided is a sector gear including: a drive gear having a drive part that forms a part of a circle and has a plurality of teeth and a non-drive part that forms a remaining part of the circle and provides a non-contact angle of at least approximately 90 degrees; first and second movers forming a disconnector and a grounded breaking switch, respectively; and first and second driven gears engaged with the drive gear and respectively engaged with the first and second movers and configured to make the first mover or the second mover operate in conjunction with the drive part of the drive gear according to a direction of rotation of the drive gear, wherein an intermediate angle between the first and second movers is between approximately 90-135 degrees. The present invention can reduce the size of the gas-insulated switchgear having the sector gear.

A catheter assembly including an elongate member having a proximal end and a distal end. The distal end has at least one drainage opening. A hydrophilic coating is provided on at least a portion of the elongate end of the catheter. A fluid containing member is provided and is either arranged on the elongate member or within a separate area of the container. The fluid containing member contains sufficient hydrating fluid to hydrate the coating of the catheter. A container contains the elongate member and the fluid containing member and incorporates at least one foil layer to prevent evaporation of the hydrating fluid. A method of using the catheter includes inserting a catheter into a user's body and draining fluid from the user's body.

Containers and components thereof for use in the medical industry and methods to manufacture the same are described. An example tab for use with a medical container includes opposing sheets sealed to define an open ended chamber into which a port is to be at least partially positioned. The port is to enable access to the medical container. The tab includes a tear seal defined by each of the opposing sheets and a first guide positioned on a first side of each of the tear seals. The tab includes a second guide positioned on a second side of each of the tear seals, wherein the first and second guides are to enable a tear to propagate substantially between the guides and adjacent the tear seals.

A book having a page construction for improved page manipulation. The book includes a plurality of pages bound together at an edge margin, wherein each page includes a bound edge and a plurality of free edges. At least one of the free edges of at least one of the pages includes an edge relief. The pages may comprise cardboard or other stiff material having a thickness. The free edges include opposed top and bottom edges and a side edge. The edge relief may extend along the entire side edge or only a portion thereof. The edge relief may be in the form of, for example, a chamfer, a bevel, a radius, a notch, a step, or the like.

An input receiver circuit including a single-to-differential amplifier and a semiconductor device including the input receiver circuit are disclosed. The input receiver circuit includes a first stage amplifier unit and a second stage amplifier unit. The first stage amplifier unit amplifies a single input signal in a single-to-differential mode to generate a differential output signal, without using a reference voltage. The second stage amplifier unit amplifies the differential output signal in a differential-to-single mode to generate a single output signal.

A scan head assembled to a scan arm for an ion implanter and a scan arm using the same are provided, wherein the scan head is capable of micro tilting a work piece and comprises a case, a shaft assembly, an electrostatic chuck, a first driving mechanism and a micro-tilt mechanism. The shaft assembly passes through a first side of the case and has a twist axis. The electrostatic chuck is fastened on a first end of the shaft assembly outside the case for holding the work piece. The first driving mechanism is disposed within the case and capable of driving the shaft assembly and the ESC to rotate about the twist axis. The micro-tilt mechanism is disposed within the case and capable of driving the shaft assembly and the ESC to tilt relative to the case.

An apparatus of semiconductor process including a chuck and a vacuum source is provided. The chuck has a plurality of holes for holding a semiconductor substrate, and the vacuum source is used for providing vacuum suction through the holes to make the semiconductor substrate be subjected to varied suction intensities according to a warpage level thereof.

A cutting tool includes a chuck, a compressible conical collet and a lock nut for locking the collet. The cutting tool lock nut has a nut portion with a threaded portion for threading with the chuck, and a locking portion with a collet-locking surface formed with angled coolant grooves thereon. The collet-locking surface presses on the collet head, thereby compressing it to grip a tool shank in a collet bore thereof. As the locking portion presses only against a peripheral surface of the collet head, the lock nut is suitable for locking collets with different bore diameters. When the chuck is provided with a coolant fluid, the coolant fluid flows through the chuck and through the collet towards the locking portion, passing through the coolant notches between the locking portion and the collet head, and sprayed towards a location along the tool shank.

A surgical needle has a top edge formed by two pressed faces located inside or outside of curvature from pressing a material blank made of austenitic stainless steel having fibrous texture and cutting edges formed on both sides of a base. The top edge is sharp at a needle point and the sharp needle point is constituted of fibrous texture formed at the surface layer of the material blank. Grinding marks extending crosswise formed on the face of the mold are transferred to the pressed faces. A mold constitutes plural faces forming projecting angles (angle between two intersecting faces is 180° or below, and the line at which the two faces intersect is made as a projecting line) along edges of the blocks made of two rectangular prisms, and constitutes a cavity by suitably contacting the edges of the blocks.