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High energy, ultrashort pulse ring fiber laser having a linear dispersion compensator with chirped Bragg gratings

InactiveUS20080025348A1Easily adjustFreedom misalignmentLaser using scattering effectsLight sourceErbium
A high energy, ultra short pulse ring fiber laser is provided that includes a passively mode locked, all optical fiber laser formed from a closed loop of optical fiber doped with erbium or other rare earth metal, a pump light source optically coupled to the loop of optical fiber, and a linear dispersion compensator that includes a pair of chirped Bragg gratings with substantially equal but opposite sign dispersion. The difference in dispersion between the pair of chirped Bragg gratings is adjusted so that it is substantially equal and opposite to the dispersion generated in the loop of optical fiber. The linear dispersion compensator includes a tuner which can individually stretch or compress the pair of chirped fiber Bragg gratings such that one of the gratings can be adjusted to cancel out the dispersion of the ring laser cavity, while the other grating is adjusted to eliminate third order dispersion of the cavity.
Owner:CORNING INC

Preparation method of microencapsulated gradient halogen-free flame retardant system

The invention relates to a preparation method of a microencapsulated gradient halogen-free flame retardant system. The preparation method comprises the steps of: mixing a phosphorus-series flame retardant with an inorganic flame retardant according to a certain ratio to obtain a microencapsulated halogen-free flame retardant, then carrying out surface modification on a charring agent, and then mixing the microencapsulated halogen-free flame retardant, a phosphorus-containing organic flame retardant and surface-modified charring agent according to a certain ratio to obtain the microencapsulated gradient halogen-free flame retardant system. By using the system, distributed gradient flame retarding is realized, the flame retardancy of a polymer material is greatly improved, the defect that compatibility between the flame retardant and the polymer is poor is solved, the migration of the halogen-free flame retardant from the polymer matrix under high-temperature and moisture conditions is significantly reduced, and the long-term storage of a flame-retardant polymer material is facilitated. The method has the characteristics of simple process, convenience for operation, environmental friendliness, and lower cost. The obtained flame retardant system has good flame retarding effect and wide application field.
Owner:JILIN UNIV

Process method for preparing cold brewing tea by ice crystallization cell wall breaking

The invention discloses a method for preparing cold brewing tea by ice crystallization treatment. The method comprises the following steps: putting fresh tea leaves in a low-temperature environment below 40 DEG C below zero for ice crystallization; putting the tea leaves subjected to the ice crystallization treatment into a vacuum container; slubbing the tea leaves in the vacuum container; heatingthe vacuum container at a heating temperature of between 70 and 100 DEG C; and stirring the tea leaves in the heated vacuum container until the tea leaves are dried. The ice crystallization process,which is adopted for replacing the conventional withering process, can change the conventional process depending on human experience control into data control and significantly improve the product consistency; the ice crystallization cooperated with the enzymatic oxidation of vacuum negative pressure isolated environment oxygen can avoid the problem of peroxided sensitive substances in the tea leaves; the adoption of an ice crystallization wall breaking process combined with vacuum evaporation dewatering drying can avoid the problem of reoxidation in the drying process; the tea prepared by theice crystallization wall breaking process has better solubility in cold water; the cold water brewing tea prepared by the ice crystallization wall breaking process can improve tea drinking habits ofhuman beings; and the adoption of the cold water brewing tea can save a large amount of energy for boiling water. The method can also be used for preparing cold water brewing beverages by using otherplants to conventionally be soaked in water for drinking, such as ginseng leaves, ginkgo leaves, chrysanthemums, green plums, olives and the like, thereby providing a new idea for enriching markets.
Owner:苏少宁

Method and apparatus for the measurement and control of both the inside and outside surface temperature of thermoplastic preforms during stretch blow molding operations

A stretch blow molding system that condition preforms such that the temperature distribution within the cross-section of each preform is optimized prior to blow molding operations is provided. The system has a temperature measurement and control system capable of directly monitoring both the outside as well as inside surface temperature of preforms at different stages of transport throughout the thermal conditioning section of the system.
Owner:PRESSCO IP
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