Abstract: Filters, methods, and an apparatus for filling housings and both encapsulated porous and non-porous spaces with contaminant control media for placement in electronic enclosures, such as disk drive enclosures, are disclosed. In one embodiment, a filter assembly includes a housing comprising an internal cavity configured to receive contaminant control media, a fill port in communication with the internal cavity, and an opening in communication with the internal cavity, and filter media at least partially covering the opening; and contaminant control media occupying the internal cavity. Contaminant control media is deposited within the internal cavity via the fill port by means of creating a negative pressure within the internal cavity. The application of a partial vacuum facilitates movement of the contaminant control media into the internal cavity and minimizes the contamination of the filter, housing, and work space common to other loose fill filling methods. Other aspects and embodiments are provided herein.

Abstract: The invention refers to a centrifugal separator comprising a stationary casing defining an inner space, a spindle and a rotating member, which is attached to the spindle and arranged to rotate around an axis of rotation with a rotary speed. The rotating member comprises a number of separating discs which are provided in the inner space. A drive member drives the spindle and the rotating member with said rotary speed. A sensor device senses the rotation of the rotating member in relation to the casing. The sensor device comprises at least one transmitter element which is provided in the inner space on the rotating member and a receiver element which is provided at the casing and arranged to sense the transmitter element. The receiver element is provided on the casing outside the inner space.

Abstract: In a centrifugal separator for cleaning a gas containing liquid impurities, a stationary casing encloses a separation space having an inner wall surface. An inlet is provided. A rotating member is provided in the separation space downstream the inlet rotates in a direction of rotation around an axis of rotation. The rotating member brings the gas to rotation in the direction of rotation for separation of liquid impurities from the gas. A gas outlet is provided downstream the rotating member for discharge of the cleaned gas. A first liquid outlet is provided upstream the gas outlet and downstream the rotating member for discharge of separated liquid impurities and comprises an outlet hole. A surrounding ring groove extends outwardly from the inner wall surface in the stationary casing and has a surrounding bottom surface, wherein the outlet hole extends outwardly from the bottom surface.

Abstract: Provided are an expansion-type silencer (10) including a substantially rectangular parallelepiped-shaped expansion chamber (16) surrounded by six partition walls and having a suction port (20) and an exhaust port (22) which are formed in the partition walls, and an oxygen concentrator using the expansion-type silencer (10). The expansion-type silencer (10) has a rib (24) extending from one of the partition walls of the expansion chamber (16) formed with the exhaust port (22) toward the interior of the expansion chamber (16) while being in contact with both of a pair of parallel partition walls adjacent to the one of partition walls. The rib (24) is formed with an air passage (26) for providing communication between the exhaust port (22) and the expansion chamber (16).

Abstract: An air filtering device and an air cleaning system of a semiconductor manufacturing apparatus to reduce cost and increase manufacturing productivity. The air filtering device may include a frame having an open aperture coupled to an air supply line. A buffer frame configured to be inserted into the frame may include a plurality of slot parts, each slot part having a plurality of air in/out apertures through which air may flow in or out from the buffer frame. A plurality of filters may be releasably fastened to the plurality of slot parts to filter pollution material contained in air flowing through the air in/out apertures. An air interrupter for interrupting air flowing through the air in/out apertures may be used when replacing the plurality of filters, thereby providing purified air to the semiconductor manufacturing apparatus during the replacement.

Abstract: A condensed water discharging apparatus for a fuel cell system is disclosed. The condensed water discharging apparatus includes: a drain tank installed around a hydrogen discharging line comprising an inlet portion, an outlet portion formed on both distal ends of the drain tank, and a intermediate portion having at least a drain hole installed wherein the intermediate portion is disposed inside the drain tank so that condensed water is separated from hydrogen flowing in through the intermediate portion by gravity and is drained downwardly; and a drain pump connected to the drain tank to discharge condensed water drained through the drain holes of the intermediate portion.

Abstract: A cooking appliance having a removable storable lid and having legs which are foldable into at least two positions, one position being an operable position in which legs depend from the appliance and support the appliance above and on a support surface, and the other being a storage position in which the legs fold into a more compact configuration and simultaneously retain the lid to the appliance.

Abstract: A drawer-type cooking device and a method for controlling opening and closing of a door thereof, in which an opening/closing direction and an absolute position of a door by a manual opening/closing operation by a user can be detected with a simple structure even when the door is in a door-open state in an intermediate position, is provided. A rotation sensor 26 is disposed in relation to an output shaft of a motor 25 for driving a door capable of opening and closing an opening of a cooking device body in an opening/closing direction. A microcomputer 20 controls drive of the motor 25 including a rotation direction by receiving an input of a detection signal of the rotation sensor 26, which is a sensor for generating two rotation pulses having different phases (for example, pulse train signals with a 120-degree difference) from the motor. A control device can determine the rotation direction of the motor 25 based on the two rotation pulses therefrom.

Abstract: A cooking implement shelf is disclosed that is attachable to a commercial griddle and is able to support and position cooking implements such as a spatula, grill weights, cooking tongs, a salt shaker, etc, in a location that is readily accessible to a grill cook and does not taking up space on the cooking surface. One aspect of the invention is attachable to a staging feature on top of a barrier that runs along the backsplash of the griddle, while another aspect is directly attachable to the backsplash or to a side splash guard of the griddle. In preferred embodiments, the accessory is made from stainless steel, includes a warming tray and drip pan under the shelf, can be positioned above the cooking surface so as to warm items in the tray without harming them, and is adjustable horizontally and in height from 8? to 17? above the cooking surface.

Abstract: A waffle iron includes upper and lower heatable textured plates which can be separated for dispensing batter thereon and for unloading cooked waffles, a recess in at least one of the heatable textured plates for receiving one of a plurality of inserts which customize waffles cooked therein. Each of the plurality of inserts has a topographically formed name, character or figure thereon, either in relief or by engraving. Each heatable plate which receives an interchangeable insert has a recess into which the insert fits. The recess may be equipped with indexing apertures or indentations. Each insert is equipped with a threaded shaft which passes through apertures in the heatable plate and associated waffle iron body portion. A nut can be secured to the threaded shaft, thereby securing the insert within the recess on the heatable plate.

Abstract: Cooking machine or deep-fat fryer comprising a vessel for holding a bath of water or frying oil, said vessel being formed by a cylindrical vertical wall or by at least a vertical planar wall, means for controllably heating said bath, a perforated basket adapted to be dipped into said vessel, wherein the heating means comprise at least an induction coil provided on the outside of a vertical wall of said vessel and oriented so that the axis of the electromagnetic flux generated by said coil is directed at the interior of said basket in a substantially horizontal direction, and an appropriate electric-frequency driver generator adapted to generate an electric voltage that is transmitted to said induction coil; said perforated basket is made of a ferromagnetic material. At least the portion of the wall that faces said induction coil is made of a heat-resistant and diamagnetic material, such as preferably glass-ceramics.

Abstract: An appliance for holding food items, such as marshmallows and hot dogs, for roasting against the face of an open fire includes food carrying skewers that are rotatably mounted on an axis generally perpendicular to the elongated frame of the device. A drive linkage, manually operated from the opposite end of the frame, rotates the skewers such that the food products are uniformly exposed to the same heating, resulting in uniformly cooked food items without burning.

Abstract: A rotisserie spit including a spit rod for supporting food, a carrier bracket for mounting the spit rod in cantilever fashion by bearings to permit rotation of the spit rod, the bracket being mounted to an upright support post such that the bracket and spit rod carried thereby can swing about the axis of the post, and a motor coupled to the spit rod for driving the spit rod in rotation about its axis.

Abstract: Outdoor cooking apparatus including a basin, a grate within the basin, a pedestal including a housing having a chamber and a container for a heat generating source. The container is preferably an insertable starter unit that is removably secured within the chamber and remains in place during cooking. The outdoor cooking apparatus is particularly useful for wok cooking as a wok may be placed on the grate such that a small diameter of very hot air is delivered from the insertable starter unit to the wok. The outdoor cooking apparatus may further be modified for other cooking purposes requiring a broader diameter of lower heat. This embodiment further includes a diffuser, preferably including a plate having apertures therein and a second larger planar grate placed within the basin above the diffuser.

Abstract: An adjustable garlic press that allows the user to choose among a variety of different grate assemblies with, for example, variable sized apertures/pattern of apertures. The apertures can be holes, or other forms, for example, in the form of dicers or slicers.

Abstract: These improvements are applied to the machines that comprise a compacting chamber and consist in: a.-the larger lower surface of the compacting chamber is made up of a substantially flat surface provided with runoff means. b.-each smaller surface of the compacting chamber has, in equal conditions, a frame arrangement which, acting as an attachment flange. c.-the output door is arranged so that is only moves in the vertical direction irrespective of whether the pressing plate has reached the stopping point. d.-the capacity of the compacting chamber is variable according to a possible excess in the introduced mass to be compacted and e.-the telescopic box has on at least one of its walls, bottom wall and/or roof through holes located in the proximity of the openable door.

Abstract: A ram driving method including the steps of fixing one end of a large-diameter piston rod (5R) integral with a large-diameter piston (5P) reciprocably included in a large-diameter cylinder (5) attached integrally to a ram (3) to a fixing unit (9), connecting one end of a small-diameter piston rod (7R) integral with a small-diameter piston (7P) reciprocably included in a small-diameter cylinder (7) integral with the large-diameter cylinder to a moving member (17) moved by a motor driving, integrally moving the small-diameter cylinder and the small-diameter piston and communicating a first compartment (5A) and a second compartment (5B) of the large-diameter cylinder divided by the large-diameter piston with each other, moving the ram integrally with the small-diameter piston rod moved by the moving member, and communicating the small-diameter cylinder with the large-diameter cylinder, thereby moving the large-diameter cylinder with a strong force by a working fluid supplied from the small-diameter cylinder.

Abstract: A system and method for tagging individual bales of hay as they are baled and recording information regarding the moisture, weight, preservative applied, field position, quality and other information available at the time of baling, all sequenced to the formation of the bale by a timing and positioning device.

Abstract: A method and system for improved plastic compactor bags is provided by the present invention. In particular, the present invention discloses a method of using plastic compactor bags having flaps for use with a compactor, such that the plastic flapped bag with two or more flaps is placed into the container of a compactor having a front panel in close proximity to the container. The flaps of the plastic compactor bag are provided such that a person installing the bag can pull the plastic bag over an upper edge of the container to facilitate securing the plastic flapped compactor bag onto the container of the compactor. Furthermore, the present invention discloses a system of a plastic flapped compactor bag placed within a container of a compactor. Finally, the present invention discloses a method of removal of a plastic flapped compactor bag from a container of a compactor.

Abstract: The invention discloses a varnish coating device that utilizes an ordinary conventional digital stencil printing apparatus, such that anyone can easily apply a uniform film of a viscous coating onto a predetermined area of, for instance, covers and surfaces of printed products. The invention functions as a varnish coating device, in place of a drum unit, when a varnish coating unit is mounted on a mounting section of a printing apparatus main body. The varnish coating unit has: a coating roller that coats the surface of printed paper with a transparent varnish liquid and feeds out the paper; a supply device having a doctor roller that forms a liquid pool on the coating roller and that supplies varnish liquid to from a coating in a predetermined thickness over a predetermined area of the surface of the coating roller; a cradle that detachably supports a varnish container; and a pumping device.

Abstract: This invention relates to a mask for screen printing, which includes a mask body composed of a plurality of pattern areas having holes for screen printing and a peripheral area surrounding the outside of the pattern areas; and a protrusion portion formed in the peripheral area of a back surface of the mask body, and to a screen printing method using the same.

Abstract: An exemplary screen printing method for printing a printed circuit board is provided. The printed circuit board includes a number of parallel electrical traces. In the method, firstly, a screen printing stencil is disposed on a side of the printed circuit board having the electrical traces and a squeegee is disposed on the screen printing stencil. Secondly, the squeegee is drawn across the screen printing stencil in a manner such that an angle between a blade of the squeegee and the electrical traces is in a range from 20 degrees to 70 degrees so as to print an ink on the printed circuit board. The method can improve quality of the printed circuit board.

Abstract: A variable cutoff printing press is provided. The variable cutoff printing press includes a first plate cylinder, a second plate cylinder, a continuous belt blanket contacting the first and second plate cylinders and a movable support cylinder supporting the belt blanket. The first and second plate cylinders, the continuous belt blanket and the movable support cylinder form a first print section and the movable support cylinder is movable to change the print length of the first print section. A method of printing images with a printing press is also provided.

Abstract: A method for developing printing plates in a printing press having at least one printing unit includes loading an imaged, undeveloped printing plate with dampening solution before a start of printing for dampening in at least one printing unit of the printing press for an active duration corresponding at least to one and one half times a time duration or number of machine revolutions provided before a start of printing when an already developed printing plate is used in the same printing press. A printing press for carrying out the method is also provided.

Abstract: A method for operating an offset printing press having at least one printing unit with an inking unit, a plate cylinder for receiving a printing plate, a blanket cylinder, an impression cylinder and a dampening unit, and for controlling an application of dampening solution from the dampening unit onto the plate cylinder, includes predampening the printing plate. After a printing pressure has been switched on between the blanket cylinder and the impression cylinder and after a printing material transport through the offset printing press has been switched on, a supply of dampening solution to the plate cylinder in the printing unit is reduced to a pronounced extent at least once for a short predefined time period, as a result of which an excess of dampening solution produced by the predampening does not accumulate permanently in the inking unit. A printing press for carrying out the method is also provided.

Abstract: A web-fed rotary printing press is disclosed. The printing press having several printing units and having a folding unit, and a turner bar nest and folding superstructure positioned between the printing units and the folding unit, in which at least one printing substrate web can be separated into partial webs and/or the or each printing substrate web or the or each partial web can be conveyed via turner bars and/or guide rollers to at least one former. At least one guide roller is respectively positioned along the transport path of the or each printing substrate web and/or the or each partial web through the turner bar nest and the folder superstructure, whose two ends are each assigned an adjusting unit, via which the respective end of the respective guide roller can be displaced linearly in and/or opposite from the running direction of the respective printing substrate web or partial web.

Abstract: A digital printer is provided with an automated printing sheet transport system, operating in an intermittent regime of feeding a printing sheet to the digital printer, halting the transport to allow printing onto the printing sheet while the printing sheet is maintained in a fixed position, and removing the printed sheet from the digital printer after printing. The digital printer may be combined with a screen print station, both operating on top of a single printing sheet transport system, to form an integrated multifunctional and hybrid printing press.

Abstract: The present invention relates to an imprint apparatus for forming a transfer pattern on a substrate. The imprint apparatus includes a container comprising a pattern forming material and a mold member comprising an imprint pattern formed on a surface.

Abstract: In the present invention, disclosed is a support for a printing plate material possessing an aluminum plate having been subjected to at least a surface-roughening treatment and an anodizing treatment, wherein the support has a roughened surface having a center-line average roughness Ra of from 0.25 ?m to 0.50 ?m, and a skewness Rsk of from ?0.8 to 0, and an objective is to provide a support for a printing plate material exhibiting excellent resistance to blanket contamination with no deterioration of printing ability, and also to provide a printing plate material exhibiting excellent resistance to blanket contamination, even though the support is employed for an on-press development type printing plate material.

Abstract: Easter bunny tracks may be laid onto the ground using a track-laying device to dispense flour or another material contrasting with the ground. Other desired track shapes (such as tracks of Santa's reindeer) may be laid using a track-laying device and suitable dispensed material. A handle with a ground-contacting rubber tip makes the device especially convenient to operate.

Abstract: A method of processing an overcoat-free on-press developable lithographic printing plate with ink and/or fountain solution is described. The plate comprises on a substrate a photosensitive layer which is either capable of hardening (negative-working) or solubilization (positive-working) upon exposure to a laser, the non-hardened or solubilized areas of the photosensitive layer being soluble or dispersible in ink and/or fountain solution. The plate is exposed with a laser, heated to an elevated temperature, and then developed with ink and/or fountain solution on a lithographic press. The laser exposed plate is preferably heated by passing through a heating device or while mounted on a lithographic press before on-press development.

Abstract: A printing sleeve (10) has a first printing sleeve portion (10A) with a first and a second end. At least one of the ends of the first printing sleeve portion has a plurality of projections (16) and notches (18). A second printing sleeve portion (10B) has a first and second end, and least one of the ends has a plurality of projections and notches. The plurality of projections and notches of the first printing sleeve portion interlocks with the plurality of projections and notches of the second printing sleeve portion.

Abstract: A method of controlling a printing unit is disclosed. The printing unit comprising a plurality of printing couple pairs, each printing couple pair comprising a plate cylinder and a blanket cylinder and an inking system associated with each printing couple pair operable to supply ink to printing plates mounted on the plate cylinders of said printing couple pairs. The printing unit also comprises a primary module carrying the printing couple pairs and, a pair of secondary modules carrying the inking systems, the secondary modules being movable relative to the primary module from an operative into a non-operative position in which each secondary module is separated from the primary module.

Abstract: There is described a sheet inspection system for a sheet-fed recto-verso printing press of the type comprising two printing cylinders (10, 20) for carrying out simultaneous recto-verso printing of the sheets, said sheet inspection system comprising at least one inspection device (200; 300; 400) for taking an image of one side of the printed sheets. The sheet inspection system comprises first and second transfer cylinders (60, 65) interposed between a first (10) of the two printing cylinders (10, 20) and a chain gripper system (5) of the printing press, printed sheets being transferred successively from the first printing cylinder (10) to the first transfer cylinder (60), to the second transfer cylinder (65), and to the chain gripper system (5).

Abstract: The present invention is directed to methods for patterning substrates by contact printing methods using tools that include continuous, flexible surfaces having variable surface areas and variable shapes.

Abstract: A demolition charge system has a multi-primed initiation system with a rigid container having interconnected thin end walls, side walls, a base and a lid. The lid continuously fits onto the end and side walls to cover and contain an internal chamber. Each of the ends walls has a threaded opening longitudinally aligned with each other. An elongated thin-walled tube longitudinally extends through the internal chamber and has threaded ends engaging inner portions of the threaded openings to securely hold the tube in the container. At least one demolition initiator is capable of longitudinally extending in the tube and a main charge in the internal chamber is positionable in abutting contact along the tube to assure demolition. Magnets assure magnetic securing of the demolition system on a ferrous target.

Abstract: An ammunition cartridge for an electrical discharge weapon having at least one dart positioned within a dart chamber in the housing. The cartridge has at least one adjustable barrel for selection between close and extended ranges and a joint and port for adjusting pressure in the barrel. In another form the cartridge has two fixed barrels and a retractable deflection ramp for selection between close and extended ranges.

Abstract: A overhead transport service vehicle system includes a carriage frame structured and arranged to carry a user. A hoisting mechanism utilizes at least one lifting device for lifting and lowering the carriage frame and at least one moving device for causing movement of the hoisting mechanism along one of a track or rail. A control controls at least one of the at least one lifting device and the at least one moving device.

Abstract: A railway truck has a frame, and two wheel-sets operatively connected to the frame. Each wheel-set includes a corresponding axle, and two wheels disposed on the axle. A first steering lever is pivotally connected to the first end portion of the first axle about a first pivot axis and to the frame about a second pivot axis. A second steering lever is pivotally connected to the second end portion of the first axle about a third pivot axis and to the frame about a fourth pivot axis. A first line passing through the first and second pivot axes crosses a second line passing through the third and fourth pivot axes at less than a predetermined distance from a vertical centerline of the truck when the first and second axles are parallel. A railcar including the truck is also disclosed.

Abstract: The invention relates to an azo pigment preparation which is characterized by a content in 4,4?-diaminodicyclohexylmethane, the percentage of the trans,trans-isomer being at least 25%, based on the total amount of 4,4?-diaminodicyclohexylmethane. The azo pigment preparation according to the invention is especially suitable for producing gravure inks having improved optical density, higher luster and no ink show-through in the gravure printing of illustrations.

Abstract: A polymeric colorant comprises a polymer-encapsulated pigment, wherein the polymer has a molecular weight in the range of 2,000 to 2,000,000 g/mole (2 to 2,000 kDa) and is a polymerization product of at least one dye-monomer conjugate. In some instances, a comonomer is added. The polymeric colorant is made by a method that comprises polymerizing at least one dye-monomer conjugate in a mixture containing pigment particles, to produce a polymerization product wherein the pigment particles are encapsulated by the polymerization product.

Abstract: The disclosure is generally related to writing instruments capable of making markings containing large diameter glitter pigment particles, and glitter ink compositions for the same. In one embodiment, the disclosure provides a capillary-action marker comprising a glitter ink composition, a low density ink reservoir for storing the glitter ink composition, and a porous nib in fluid communication with the low density ink reservoir, wherein the glitter ink composition comprises glitter pigment particles having a particle size greater than about 12.1 microns in at least one dimension.

Abstract: A pigment ink composition has high transparency and good color characteristics such as a high OD that are not inferior to those of dyes, even though pigment particles are used, and also has good weatherability and remaining ability on the coating and printing medium surface that are inherent to pigment particles. The pigment ink composition contains pigment particles including at least needle pigment particles, a dispersant, and a solvent. The needle pigment particles have a needle shape with an aspect ratio of at least 3, an average aspect ratio of at least 5 and at most 7, an average short dimension of at least 20 nm and at most 30 nm, and a distribution of short dimension with a standard deviation of 2.0 nm or less. The needle pigment particles are covered with the dispersant.

Abstract: A color pigment containing, based upon the total weight of the pigment, at least 70.0 weight % of a first compound COP according to Formula (1): wherein one of R1 and R2 is hydrogen and the other one of R1 and R2 represents —COOR4; R4 and R5 represent methyl; R3 is selected from the group consisting of: with C* representing the point of attachment of R3 to the nitrogen in Formula (I); and having a pigment surface including between 2.0 and 30.0 weight %, based upon the total weight of the pigment of a second compound according to Formula (I), wherein —R1, R2, R3, R4 and R5 have the same meaning as above with the exception that at least one of R4 and R5 represents hydrogen. Also, methods of preparation of the pigment and non-aqueous pigment dispersions.

Abstract: An aqueous ink for an inkjet, comprising a pigment, a water-soluble organic solvent A, a water-soluble organic solvent B, and water, wherein the water-soluble organic solvent A comprises at least one of diglycerol and polyglycerol, and the water-soluble organic solvent B comprises a polyethylene glycol monoalkyl ether represented by a general formula (1): RO—(CH2CH2O)n—H (wherein, R represents an alkyl group of 4 to 6 carbon atoms, and n represents an integer from 4 to 6).

Abstract: A method for producing a core sand and/or mold sand for foundry purposes mixes a granular mineral mold base material with an additive and an inorganic binder. An inorganic swelling additive having a swelling index of at least 9, in other words a higher swelling index that that achieved for coal, is used as an additive. Alternatively, it is also possible to work with an inorganic additive, for example with macro-crystalline graphite, whereby the finished mixture of the mold base material, the additive, and the binder is compacted to a density increase of at least 20 g/dm3.

Abstract: The use of a surfactant to improve the resistance of asphalt to degradation by a de-icer and/or an anti-icer, and optionally in addition to improve the resistance of said asphalt to degradation by water. The surfactant may be a fatty acid or a fatty acid derivative, such as at least one polymerised fatty acid selected from dimers and trimers of an unsaturated fatty acid, or one or more amine or substituted amine compounds, such as a reaction product of tall oil fatty acids and polyalkylenepolyamines.

Abstract: Fluorochemical urethane compounds and coating compositions derived therefrom are described. The compounds and compositions may be used in treating substrates, in particular substrates having a hard surface such as plastics, ceramics or glass, to render them water, oil, stain, and soil repellent.

Abstract: A coating liquid for forming a low dielectric constant amorphous silica-based coating film with a dielectric constant of 3.0 or below and a film strength (Young's modulus) of 3.0 GPa or more, and also having a smooth surface with an excellent hydrophobicity. The coating liquid contains (1) a silicon compound obtained by hydrolyzing bis(trialcoxysilyl)alkane (BTASA) and alcoxysilane (AS) in the presence of tetraalkylammoniumhydroxide (TAAOH), or (2) a silicon compound obtained by hydrolyzing bis(trialcoxysilyl)alkane (BTASA), alcoxysilane (AS) and tetraalkylorthosilicate (TAOS) in the presence of tetraalkylammoniumhydroxide (TAAOH).

Abstract: An organic/inorganic composite including a condensation product of an organic silicon compound represented by formula (I) as a major component; at least one kind of a photosensitive compound which is sensitive to light having a wavelength of 350 nm or less selected from the group consisting of metal chelate compounds, compounds of metal organic acid salts, metal compounds having 2 or more hydroxyl or hydrolyzable groups, hydrolyzates thereof, and condensation products thereof; and/or a compound derived from the photosensitive compound; RnSiX4-n??(I) wherein R represents an organic group in which carbon directly bonds to Si represented in the formula and X represents a hydroxyl or hydrolyzable group; n represents 1 or 2; R may be the same or different when n is 2; and X may be the same or different when (4-n) is 2 or more.