181 results about "Active core" patented technology

An optical fiber is disclosed that can be used as an active medium in fiber lasers and/or fiber amplifiers, featuring a preferably rare-earth-doped silica active core surrounded by a pure or doped silica cladding layer ("pump core"). The pump core is surrounded by a doped or pure silica inner cladding for guiding pumping radiation within the pump core. Thus, the refractive index of the inner cladding is lower than that of the pump core. The fiber is surrounded by a protective coating made of polymeric material. One or more additional outer cladding layers, having refractive indexes lower than said inner cladding, may optionally be placed between the inner cladding and the protective coating to further protect the polymer coating from damage. Unlike the prior art, the protective coating does not serve as the only cladding, but is assisted by the inner cladding and optional outer cladding(s). The resultant fiber restricts radiation mainly to silica layers, thereby increasing the damage threshold and the applicable maximum pump power of the fiber.

A photovoltaic (PV) system includes a fiber optical waveguide comprising an active core that hosts material configured to absorb and emit light, a cladding layer surrounding the active core, the cladding layer being configured to allow ambient light to pass through the cladding layer, and an exit port located proximate an end of the waveguide. The PV system further comprises one or more solar cells disposed at the exit port of the waveguide. The waveguide is configured to guide light to the one or more solar cells. Another photovoltaic (PV) system includes a waveguide comprising an active cladding layer hosting material configured to absorb and emit light, and a core layer configured to confine light emitted by the active cladding layer. The PV system further includes one or more solar cells disposed proximate the waveguide. The core layer is configured to guide light to the one or more solar cells.

A planar laser gain medium and laser system. The novel laser gain medium includes an active core having a high aspect ratio cross-section with a fast-axis dimension and a slow-axis dimension, signal claddings adapted to form reflective boundaries at fast-axis boundaries of the core, and a material adapted to minimize reflections at slow-axis boundaries of the core. In an illustrative embodiment, the laser gain medium is an optical fiber. The core and claddings form a waveguide adapted to control modes propagating in the fast-axis direction. When the laser gain medium is employed as a laser oscillator, a high reflectivity mirror and an outcoupler are positioned at opposite ends of the core to form a laser resonator adapted to control modes in the slow-axis direction.

The invention relates to a preparation method of a star polycarboxylic acid high-performance water reducing agent. Polybasic alcohol and (methyl) acrylic acid used as main raw materials for esterification are esterified and polymerized to prepare the star polycarboxylic acid high-performance water reducing agent material: the (methyl) acrylic acid and polybasic alcohol used as reactants are esterified under the action of a catalyst to firstly prepare a star polymerizable active terminal, and free-radical polymerization reaction is carried out with unsaturated polyethenoxy ether, molecular weight regulator and unsaturated carboxylic acid monomer under the action of an initiator to prepare the star polycarboxylic acid high-performance water reducing agent. The invention is easy to control, and has the advantages of high polymerization degree, low cost and no pollution; the esterification reaction is carried out form an active core, and the free-radical polymerization is carried out to generate the chain arm, thereby implementing the polycarboxylic acid high-performance water reducing agent in a star molecular structure; and under the condition of common doping amount and low doping amount, the star polycarboxylic acid high-performance water reducing agent has better cement paste flowability and holding capacity than the traditional linear and comb polycarboxylic acid water reducing agents, and has favorable cement adaptability and concrete application performance.

The present invention is a laminate and resultant package expressing an aroma burst. The laminate or package is comprised of a polyolefin sealing layer; a pressure sensitive adhesive layer and microcapsules containing an active core material, the microcapsules dispersed in a resealably tacky pressure sensitive adhesive layer; the pressure sensitive adhesive sandwiched between at least two layers by being disposed along substantially an entire surface of the polyolefin sealing layer and in continuous and direct contact with a second polyolefin layer opposing and coextensive with the polyolefin sealing layer; and the microcapsules in the pressure sensitive adhesive layer having less tensile strength than the adhesive such that a fraction of the microcapsules rupture releasing core material such as an aroma or fragrance when the pressure sensitive adhesive layer is separated when the polyethylene and first polyolefin layers sandwiching the pressure sensitive adhesive are pulled apart. The laminate polyolefin sealing layer can have a portion such as one or more edge areas that are sealed to itself or a second laminate forming a lumen or chamber area. The lumen area is physically isolated from the pressure sensitive adhesive and microcapsule layer by a polyolefin layer until the polyolefin layer is ruptured.

The invention describes a method of single-transverse-mode generation for waveguide lasers of various kinds having a large cross section of their active core and thus providing a possibility of efficient pump of the active core region. This results in a laser beam with enhanced power and high spatial quality for high efficiency coupling to standard single-mode optical fiber networks. It is found that a multimode waveguide having a central dip of special shape in the refractive index profile of its core is able to guide a higher order mode with sharp central peak of its field carrying the considerable part on the mode energy and whose width is well compatible with the width of the fundamental mode of standard single-mode fibers. The useful properties of this higher order mode can be employed to provide the single-transverse-mode regime of generation in optical fiber lasers, integrated optical micro-lasers and various semiconductor laser sources.

Systems, apparatuses, and methods for managing power usage of integrated circuits. One or more processor cores may be powered down when the system is idle. Even if there is no user activity, the processor core(s) may be woken up periodically for background downloads to retrieve the latest status for social media and other applications. Additionally, a power management unit may track the average number of active cores and the average core utilization. If the average number of active cores is less than a first threshold and the average core utilization is less than a second threshold, the power management unit may generate a request to offline one or more cores. Still further, when the processor's skin temperature is above a threshold and all of the cores are operating at the lowest acceptable operating point, one or more cores may be powered down.

A section of active optical fiber (11) which comprises an active core (1), an inner cladding layer (2) and an outer cladding layer (3). The diameter of said core 91) and the thickness of said inner cladding (2) change gradually along the length of said section of active optical fiber (11). This forms tapered longitudinal profile enabling a continuous mode conversion process along the length of the section of fiber (11). The method for fabricating a section of tapered active optical fiber comprises the steps of fabricating a perform for drawing active optical fiber from said perform, installing said perform into a drawing tower, drawing optical fiber in said drawing tower and altering at least one of the two parameters including the take-off perform speed and the take-up fiber speed during drawing of the optical fiber.

The present invention relates to a digitally-controlled crystal oscillator (DCXO) circuit having control circuitry, an active core, and a pair of thermometer-coded switched-capacitor circuits (TCSCCs), each of which is coupled to the active core and to a crystal. The active core, the crystal, and the pair of TCSCCs form a DCXO, which provides an output signal having an output frequency. Each TCSCC includes multiple capacitive elements, which are selected by a respective control signal from the control circuitry to control the output frequency. The DCXO circuit may be integrated into a digital integrated circuit (IC) without need for a digital-to-analog converter (DAC), and may be used with a wide range of crystal types. By using thermometer-coding, the pair of TCSCCs provides monotonic frequency tuning behavior. Further, by utilizing different types of tuning steps, the DCXO may have a wide tuning range with high resolution.

An over-provisioned multicore processor employs more cores than can simultaneously run within the power envelope of the processor, enabling advanced processor control techniques for more efficient workload execution, despite significantly decreasing the duty cycle of the active cores so that on average a full core or more may not be operating.

This invention provides an ADNF polypeptide comprising an active core site, the active core site comprising at least one D-amino acid. The invention also provides a pharmaceutical composition comprising an ADNF polypeptide comprising an active core site, the active core site comprising at least one D-amino acid. In particular, the pharmaceutical composition of the invention is orally active. The invention further provides methods for reducing neuronal cell death, methods for reducing oxidative stress, and methods for reducing a condition associated with fetal alcohol syndrome using the ADNF polypeptides and the pharmaceutical compositions of the invention.

A monolithically integrated electroabsorption modulated laser having a ridge waveguide structure, has lateral ion implantation. The integrated device has a laser section and a modulator section. The modulator section has ion implanted regions adjacent to the waveguide ridge. The implanted regions penetrate through the top cladding layer to reduce capacitance within the intrinsic active core of the reverse biased modulator and allow a shallow etched ridge waveguide structure to be used for the modulator. The device provides good optical coupling, efficient manufacturing, and good high power performance.

The invention relates to an electric bicycle Li-battery charging series-parallel conversion connector, characterized in comprising plug and socket, where the plug connected with a charging power supply is equipped with contact spring plate and raised head part, and the socket comprises main component, active core, two removable switch side plates and removable baseboard, the switch side plates are horizontally equipped with switches composed of normally closed static contact, active contact and normally opened static contact, vertically arranged in order; the top surface of the active core is made with plug socket and the two sides are equipped with contact drive grooves and the bottom is equipped with support spring; and inserting and pulling out the plug and driving switch contacts can change Li-battery connecting mode so as to implement a series-discharging and parallel- charging effect. And the invention provides a series-parallel converter for implementing series discharging and parallel charging of Li battery, and can assure Li-battery voltage reaches a desired value.

A fiber amplifier in which the active core is surrounded by a cladding and coupling of radiation between a core mode and cladding modes is suppressed to minimize cladding mode losses in a short wavelength range. An index profile is established in the active core and in the cladding such that the core exhibits a loss above a cutoff wavelength λ_c and positive gains in the short wavelength range below the cutoff wavelength λ_c. Suppression of cladding mode losses is achieved by an arrangement for suppressing the coupling of radiation in the short wavelength range between a core mode supported the active core and a cladding mode supported by the cladding. The arrangement for suppressing can include an absorbing material or a scattering material distributed in the cladding. The arrangement for suppressing can include a non-phase-matched length section of the fiber amplifier in which the core mode and the cladding modes are not phase matched.

The invention discloses a preparation method of a palladium-mesoporous silica core-shell nano-catalytic material. Sodium hydroxide is taken as a catalyst, CTAB (cetyltrimethylammonium bromide) is taken as a template of a mesostructure, formaldehyde and sodium citrate are taken as reducing agents, and a palladium-mesoporous silica nano-material with a core-shell structure is obtained through a simple and convenient synthetic route in one step. The preparation method comprises the following steps: firstly, CTAB as the template is dissolved sufficiently in an alkaline aqueous system; then formaldehyde and sodium citrate are added and reduce a palladium source into palladium nano-particles; finally, tetraethoxysilane is cross-linked with CTAB micelle as a surfactant, a palladium core is coated with a mesoporous silica shell layer, and the palladium-mesoporous silica core-shell nano-material can be obtained. The precious metal palladium has very good catalytic activity, so that mesoporous channels of the silica shell layer can provide channels allowing molecules to enter, leave or be contacted with the active core, and the palladium-mesoporous silica core-shell material can be applied to the field of catalysis.

Concatenated distributed feedback lasers having novel waveguides are disclosed. The waveguides allow for coupling of the laser beam between active and passive waveguide structures and improved device design and output efficiency. Methods of making along with methods of using such devices are also disclosed.

Novel burst-free, sustained release biocompatible and biodegrable microcapsules which can be programmed to release their active core for variable durations ranging from 1–100 days in an aqueous physiological environment. The microcapsules are comprised of a core of polypeptide or other biologically active agent encapsulated in a matrix of poly(lactide/glycolide) copolymer as a blend of uncapped (free carboxyl end group) and end-capped forms ranging in ratios from 100/0 to 1/99.