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55results about How to "Limited size" patented technology

Proportional valve with shape memory alloy actuator

A proportional valve is disclosed for controlling the outlet pressure of a fluid flowing therethrough. The valve comprises a valve body having an inlet port and an outlet port for the fluid. The valve also has an inner chamber, within which there is formed a valve seat that may be opened and closed variably by a shutter axially movable from and towards the valve seat. Movement of the shutter is controlled by a shape memory alloy (SMA) actuating member operating antagonistically to an elastic member, the temperature of the fluid being lower than the transition temperature of the shape memory alloy. The actuating member and the elastic member are connected to the body valve at opposite sides relative to the valve seat. A power control circuit is also provided for circulating an electric current through the actuating member so as to heat the same by Joule effect from a temperature lower than the transition temperature to one that is higher. At least one vent hole is formed in the valve body for putting a portion of the chamber upstream of the valve seat into fluid communication with the outside or a collection network. The actuating member is housed in that portion of chamber corresponding to the inlet port of the fluid, whereby a continuous flow of fluid around the actuating member is ensured for accelerating the cooling process. A closed-loop control circuit for the power control circuit controls the circulating current as a function of a pressure signal generated by fluid pressure sensing means and in such a way as to offset the retarding effect produced by the fluid during heating of the actuating member.
Owner:ARENA ALBERTO +2

Flexible transaction management method in key-value store data storage

The invention belongs to the technical field of computer database management, and particularly relates to a flexible transaction management method in key-value store data storage, which includes the following steps: when data is written, a coordinative module packages a request into a log and obtains the existing log position, the Parkes algorithm is used to write the log into the new log position, the position is recorded, the successful operation information is returned, and the data and the log position are written into the data storage; when the data is read, the coordinative module obtains the newest log position and checks whether the data is updated, if the data is updated, the data is read and returned to the user, and if the data is not updated, the log is read, and the data is then corrected and read and returned to the user. The flexible transaction management method improves the concurrency, the fault tolerance and the expansibility of the key-value store data storage, can narrow the limitation range of the transaction as much as possible under the circumstance that the system consistency is ensured, and improves the concurrency of the system; and the design of the flexible transaction has high positive function in improving the flexibility and the adaptability of the database transaction.
Owner:TSINGHUA UNIV

Machining method for comprehensive utilization of waste rock of Hainan Shilu iron mine

The invention discloses a machining method for comprehensive utilization of waste rock of the Hainan Shilu iron mine. According to the machining method, the waste rock is evenly fed into a first screening machine through a feeding machine, and the first screening machine screens the waste rock into three types including large rock, medium-sized rock and small rock; minerals and large stone are sorted out from the large rock through a mineral sorting machine; minerals and medium-sized stone are sorted out from the medium-sized rock through a mineral sorting machine; the small rock is broken through a breaker and then conveyed into a mineral sorting machine, and minerals and small stone are sorted out; and the small stone and powder are fed into a ball mill to be ground, the ground small stone and the ground powder are then conveyed into a second screening machine, and then gravel and building sand of three specifications including the large size, the medium size and the small size are screened out. By the adoption of the machining method for comprehensive utilization of the waste rock of the Hainan Shilu iron mine, the waste rock is recycled to be manufactured into products having the economic value, so that the economic benefit is improved, and the environment is protected.
Owner:杜建国 +1

Fluorescent transparent ceramic capable of emitting blue-green light and preparation method thereof

InactiveCN110642624ALimited sizeWork around size constraintsFluorescenceMonochromatic color
The invention provides a fluorescent transparent ceramic capable of emitting blue-green light and a preparation method of the fluorescent transparent ceramic, belonging to the technical field of luminescent materials. The chemical formula of the transparent ceramic is as shown in (I): (Ca<1-x-y>Ce<x>R<y>)<3>(Sc<1-z>L<z>)<2>(Si<1-m>K<m>)<3>O<12>, wherein R is one or more selected from the group consisting of elemental Y, Gd, La, Lu, Tb, Li and Na; L is one or more selected from the group consisting of elemental Zr, Hf and Mg; K is one or two selected from the group consisting of elemental Al and P; x is greater than or equal to 0.0002 and less than or equal to 0.02; y is greater than or equal to 0 and less than or equal to 0.03; z is greater than or equal to 0 and less than or equal to 0.02; m is greater than or equal to 0 and less than or equal to 0.02; and the sum of y, z and m is greater than 0 and less than 0.05. The invention also provides a preparation method of the fluorescent transparent ceramic capable of emitting blue-green light. The transparent ceramic disclosed by the invention can be effectively excited by blue light and emits broadband blue-green light with a peak value of 505 nm, so high-power monochromatic green light LED/LD can be prepared.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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