摘要:
An article is proposed for display of pictures, images, messages, illumination patterns, etc. placed on outer and inner surfaces of a cube-shaped structure comprising six sides, the adjacent sides are hingedly joined providing for conversion of the structure from a folded cubical state into an unfolded flat state, forming a flat cross-shaped figure, and vice-versa, first fasteners engaging the sides in the folded state and disengaging in the unfolded state, a brace providing a desirable position for the cross-shaped figure, second fasteners engaging and disengaging the cross-shaped figure with the brace, wherein only the outer surfaces are displayed in the folded state, and at least the inner surfaces are displayed in the unfolded state. Embodiments include different types of illumination, means for placement of the pictures on the surfaces, designs of the brace and fasteners. Some embodiments are usable as a Christmas tree cube and as a crucifixion after Christmas.
摘要:
A commercial and social system is controlled by collecting information related to historical events from veterans and active duty personnel. The historical events are stored in a database as keypoints based on time and location. Personal profile information for the veterans and active duty personnel is also collected and stored in the database. The information stored in the database is accessed based on search selections. A timeline of the historical events is presented based upon matches between the search selections and information stored in the database. A veteran or active duty personnel associated with the historical events is identified. A connection to the identified veteran or active duty personnel is controlled to enable a commercial or social activity with the identified veteran or active duty personnel. The historical events can also relate to sport teams, corporations, professional organizations, government, schools, and other organizations with numerous members.
摘要:
The invention is concerned with a device and a method for controlling an inverter associated with a power source, which typically will be a distributed power source. The role of an inverter is to modulate the electrical power output, e.g. to provide a three phase AC electrical output at suitable voltage, where the output is to be supplied to a conventional power distribution, grid. The invention involves modelling the behaviour of a synchronous electrical generator. Variables represent the angular position and rotational speed of the virtual rotor (14) of this virtual synchronous generator. The torque electromagnetically exerted on the rotor is calculated from a measured inverter output current, and from a variable representing excitation current in the rotor. Allowing for this and for a notional drive torque applied to the virtual rotor (which in the physical analogue would be supplied by some prime mover such as an engine), as well as for the virtual inertia of the rotor, the angular speed of the virtual rotor is calculated, Using the angular position and rotational speed of the virtual rotor, and allowing for the aforementioned excitation current, it is possible to obtain the cmf induced in stators of the virtual generator. On this basis a control signal is generated which causes the inverter to produce an AC output corresponding to that which would be provided by the virtual synchronous generator. A synchronous generator must be regulated, as too must the virtual synchronous generator of the present invention. To this end, the invention provides a feedback loop in which deviation of the rotational speed of the virtual generator rotor from a reference angular speed is detected and is used to adjust the virtual drive torque, thereby to regulate the rotational speed of the rotor and hence the frequency of the AC output and the real power supplied by it.
摘要:
A laser containment system in which a platform is suspended above a table on which laser light experiments will be performed. A number of curtain pockets having U-shaped cross sections are mounted beneath the platform, with the pocket openings facing down toward the sides of the table. A roller is mounted between end walls inside each pocket, and a laser curtain long enough to be lowered past a corresponding side of the table is wound on each roller. A clutch supported on an end wall of each pocket operatively engages an end of the roller inside the pocket to lower or raise the curtain on the roller. An associated clutch pulley is disposed outside the end wall of each pocket on which the clutch is supported. A curtain chain engages the circumference of the pulley, and the chain hangs outside the curtain when lowered for access by a user.
摘要:
A method of controlling an inverter, by modelling a synchronous generator is provided. The method includes: representing angular position and rotational speed of virtual generator rotor using numerical variables; measuring the inverter's output current; calculating virtual electromagnetic torque acting on the virtual generator rotor from: measured inverter output current and variable representing virtual excitation current; calculating rotational speed of the virtual rotor from: virtual electromagnetic torque, variable representing virtual drive torque applied to the virtual generator rotor, and parameter representing the rotor's virtual inertia; calculating, from the variables representing angular position and rotational speed of virtual generator rotor, and excitation current, control signal for controlling the inverter to produce AC output which corresponds to that of the virtual synchronous generator; and implementing first feedback loop in which deviation of rotational speed of virtual generator rotor from a reference rotational speed is detected and used to adjust the virtual drive torque.
摘要:
Device, system and method of protecting aircrafts against incoming threats. For example, a system for protecting an aircraft against an incoming threat includes: one or more electro-optic sensors to substantially continuously search for the incoming threat, and to generate a signal indicating that a possible incoming threat is detected; one or more radar sensors to be activated in response to the signal, and to search for the incoming threat; and a central computer to determine whether or not the incoming threat exists, based on a sensor fusion algorithm able to fuse data received from the one or more electro-optic sensors and data received from the one or more radar sensors.
摘要:
A laser containment system in which a platform is suspended above a table on which laser light experiments will be performed. A number of curtain pockets having U-shaped cross sections are mounted beneath the platform, with the pocket openings facing down toward the sides of the table. A roller is mounted between end walls inside each pocket, and a laser curtain long enough to be lowered past a corresponding side of the table is wound on each roller. A clutch supported on an end wall of each pocket operatively engages an end of the roller inside the pocket to lower or raise the curtain on the roller. An associated clutch pulley is disposed outside the end wall of each pocket on which the clutch is supported. A curtain chain engages the circumference of the pulley, and the chain hangs outside the curtain when lowered for access by a user.
摘要:
Device, system and method of protecting aircrafts against incoming threats. For example, a system for protecting an aircraft against an incoming threat includes: one or more electro-optic sensors to substantially continuously search for the incoming threat, and to generate a signal indicating that a possible incoming threat is detected; one or more radar sensors to be activated in response to the signal, and to search for the incoming threat; and a central computer to determine whether or not the incoming threat exists, based on a sensor fusion algorithm able to fuse data received from the one or more electro-optic sensors and data received from the one or more radar sensors.
摘要:
An article is proposed for display of pictures, images, messages, illumination patterns, etc. placed on outer and inner surfaces of a cube-shaped structure comprising six sides, the adjacent sides are hingedly joined providing for conversion of the structure from a folded cubical state into an unfolded flat state, forming a flat cross-shaped figure, and vice-versa, first fasteners engaging the sides in the folded state and disengaging in the unfolded state, a brace providing a desirable position for the cross-shaped figure, second fasteners engaging and disengaging the cross-shaped figure with the brace, wherein only the outer surfaces are displayed in the folded state, and at least the inner surfaces are displayed in the unfolded state. Embodiments include different types of illumination, means for placement of the pictures on the surfaces, designs of the brace and fasteners. Some embodiments are usable as a Christmas tree cube and as a crucifixion after Christmas.
摘要:
The garment parts hereof, namely the garment placket, collar and cuffs, have a smooth, neat appearance, obviating the need even for touch-up ironing, and thus are particularly suitable for wash-and-wear promotion. Moreover, the fabric for these parts, although not possessing "recoverable" stretch and thus heretofore unsuitable for my prior patented sewing technique for achieving pucker-free seams (U.S. Pat. No. 3,453,662), are now adapted to be sewn so as to provide the patented result noted. To a significant extent, this desired wash-and-wear performance is achieved by an artificially created "recoverable" stretch in the lining fabric. That is, the invention contemplates converting, by attachment of a control strip to said lining, what is ordinarily bias stretch of a non-recoverable nature therein into that of a recoverable nature, with the result that said "stretch recovery" relieves the sewing thread of tension and tautness and thus minimizes stitch pucker, wrinkles and the like from being manifested in the shirting fabric.In result therefore, the control strip solves a dilemma presented in the sewing of non-stretch fabrics. The dimensional stability of the non-stretch liner in the straight is required, yet it is unusable because it sews very badly. A bias interliner is also unusable because, while sewing well, it elongates under the stress of the sewing operation and thereafter shrinks back to the dimension of the non-stretch shirting being sewn together with it, causing pucker, bubbles, ripples and distortion after the sewing operation has been completed. The liner and control strip combination thus contemplated in this invention gives the dimensional stability of non-stretch coupled with the sewing qualities of stretch, all to the end of providing the favorable sewing result as set forth in my prior patent, U.S. Pat. No. 3,453,662.