91 results about "Initial curve" patented technology

The invention discloses a frequency modulation reserve market realization method considering medium and long-term electricity contract decomposition and belongs to the technical field of power system planning. According to the method, energy electricity generation cost, a frequency modulation market prospective earning, a contract completion rate and other factors are considered, an electricity contract is decomposed with the maximum self-interest being a goal, an electricity generation initial curve obtained after contract decomposition is corrected according to a security requirement and contract completion constraint, a transaction priority and a settlement reward amount of a performance superior unit are set through a frequency modulation reserve market ''two-part system'' quotation mode, an electricity generator gives a quotation based on opportunity cost when declaring a capacity price, a market clearing price can reflect the frequency modulation supply and demand situation in a system, the unit is promoted to actively provide a frequency modulation assistance service on the premise of guaranteeing secure operation of the system, and the performance of the unit is improved.

The invention relates to a centrifugal fan which comprises a fan frame and an impeller which is accommodated in the fan frame, wherein a channel is formed at the periphery of the impeller in the fan frame, one side of the fan frame is provided with an air outlet, the periphery of the fan frame is provided with an initial curve part and an expanded curve part connected with the initial curve part, the expanded curve part is placed at the rear side of the initial curve part along the direction of rotation of the impeller, the initial curve part extends along an Archimedean spiral or logarithmic spiral, the expanded curve part is placed on the outboard of the extended line obtained by extending the started curve part along the Archimedean spiral or logarithmic spiral, a guide plate is arranged in the fan frame, the guide plate extends from the air outlet to the channel, and the guide plate divides the channel into two airflow channels.

The invention discloses a synechia cell image segmenting method based on a polyphase mutual exclusion level set. The circle centers of all cells are acquired through carrying out Hough transformation circle detection to quasi-circle cells in a microscopical cell image; a small circle is automatically set according to the circle center of every cell; each small circle is taken as an initial curve; independent evolution is carried out to a synechia cell area under the effect of mutual exclusion energy according to the guidance of image gradient information and the mode of simultaneously evoluting multi-level functions; mutual exclusion among different closed curves can be ensured; therefore, the synechia cell image is segmented; the problem that the traditional segmenting method cannot segment synechia crowded cell group areas is solved; and the method of the invention is advantaged by that the processing steps are few, the segmented cell outlines are natural and the method is applicable for segmenting and counting the quasi-circle cell image, has high measurement precision and strong adaptive capacity.

What is disclosed is a novel system and method for text vectorization for bitmap images with reduced artificial discontinuities. Dominant points are identified in a bitmap character image. An initial curve is fitted to edge points of the character image in a vicinity of a selected dominant point. A set of boundary parameters in a vicinity of the selected dominant point are estimated based upon the initial curve. The selected dominant point is then classified as one of a sharp dominant point and a smooth dominant point based upon the boundary parameters or alternatively upon predefined classifications produced by an optical character recognition process. Curves are fitted between the selected dominant point and adjacent dominant points. The fitted curves maintain the estimated boundary parameters in the vicinity of smooth dominant points. A vectorized representation of the text character image based upon the fitted curves is produced as output.

The invention relates to a boomerang that can automatically change both elevation angle α of blades and curve radius r of blades upon the change of rotary speed of blades (12), wherein blades (12) are made of elastically plastic film preferably selected from a group of polyvinyl chloride, polypropylene, polyethylene terephthalate, polystyrene and high impact polystyrene, the material has a specific weight of from about 0.9 g / cm3 to about 1.60 g / cm3 and as thickness from about 0.1 mm to about 1 mm; the ratio between the depth of the rear groove and blade width is from about 1 / 7 to about 6 / 7; the ratio between depth of the front groove and blade width is from about 0 to about 3 / 7; the elevation angle α0 is from about 10° to about 45°; the initial curve radius r0 of the blades is longer or equal to 1 / 5 of the radius R of said ring (13); the ratio between the total area of said blades and the area of a circle defined by said ring (13) is from about % to about 38%.

An energy transfer system absorbs impact forces and / or energy from a moveable conductive blade directly attached to a moveable contact in a circuit breaker. The energy transfer system includes a rotatable member and a biasing member. The rotatable member has an axis of rotation about which the rotatable member is rotatable between a first position and a second position. The rotatable member further includes a protrusion. The protrusion has an initial curved engagement surface portion, a planar engagement surface portion next to the initial curved engagement surface portion, and a final curved engagement surface portion next to the planar engagement surface portion. The biasing member biases the rotatable member towards the first position. The movable conductive blade impacts the initial curved engagement surface portion to cause the rotatable member to begin to rotate about the axis of rotation such that the moveable conductive blade then contacts the planar engagement surface portion and then the final curved engagement surface portion.