4555results about How to "Improve stability" patented technology

A composition and method for releasing a bio-active agent or a drug within a biological environment in a controlled manner is disclosed. The composition is a dual phase polymeric agent-delivery composition comprising a continuous biocompatible gel phase, a discontinuous particulate phase comprising defined microparticles and an agent to be delivered. A microparticle containing a bio-active agent is releasably entrained within a biocompatible polymeric gel matrix. The bio-active agent release may be contained in the microparticle phase alone or in both the microparticles and the gel matrix. The release of the agent is prolonged over a period of time, and the delivery may be modulated and/or controlled. In addition, a second agent may be loaded in some of the microparticles and/or the gel matrix.

Disclosed is a solid or semi-solid gelatin nanoparticulate active agent dosage form comprising at least one nanoparticulate active agent and at least one gel forming substance which exhibits gelation sufficient to retain excess water in the solid or semi-solid gelatin form. The active agent particles have an effective average diameter prior to inclusion in the dosage form of less than about 2000 nm. The dosage form of the invention has the advantages of easy administration combined with rapid dissolution of the active agent following administration.

The invention discloses a method for preparing a silica aerogel material and relates to the method for preparing the aerogel material, in particular to the method for rapidly preparing a transparent SiO2 aerogel by being based on the sol-gel technology and adopting secondary modification and normal pressure drying. The invention provides the method for preparing the silica aerogel material, and the method has simple technology, short cycle, low cost and good safety and is conductive to large-scale production. Tetraethoxysilane is adopted as a silicon source, methyl trimethoxysilane or methyl triethoxysilane is taken as a modifier of a co-precursor, anhydrous ethanol is taken as a solvent, and hydrochloric acid and ammonia are taken as catalysts. The sol-gel acid-base two-step method is adopted for catalysis, thereby preparing the SiO2 wet gel; and the further modification is carried out on a wet gel sample after aging treatment under certain conditions, and the normal pressure low-temperature drying is finally carried out in air atmosphere, thereby preparing the SiO2 aerogel. The equipment cost during the preparation technology is low, the product has good performances and the reaction process is controllable.

In certain aspects the present invention provides methods and compositions related to rational protein design.

Methods of forming a gas dielectric structure for a semiconductor structure by using a sacrificial layer. In particular, one embodiment of the invention includes forming an opening for semiconductor structure in a dielectric layer on a substrate; depositing a sacrificial layer over the opening; performing a directional etch on the sacrificial layer to form a sacrificial layer sidewall on the opening; depositing a conductive liner over the opening; depositing a metal in the opening; planarizing the metal and the conductive liner; removing the sacrificial layer sidewall to form a void; and depositing a cap layer over the void to form the gas dielectric structure. The invention is easily implemented in damascene wire formation processes, and improves structural stability.

The invention discloses a phase-change energy-storage material nanocapsule and a preparation method thereof and particularly relates to a phase-change energy-storage material capsule using an inorganic material as a shell layer and a preparation method of the capsule. By dispersing an oil phase formed by mixing the phase-change energy-storage material and tetraethyl orthosilicate in an aqueous phase formed by water and ethanol in a shape of nanoscale droplets, carrying out hydrolysis-condensation reaction on tetraethyl orthosilicate in the presence of a basic catalyst, and forming a silicon oxide shell layer on the surface of each of oil phase droplet to coat the phase-change energy-storage material, thus obtaining the phase-change energy-storage material nanocapsule of which the particle size is less than 1mu m. The nanocapsule has the advantages of uniform particle size distribution, large surface area and high enthalpy of phase change. The preparation method is simple and feasible, is high in preparation yield and is conductive to prepration of the phase-change energy-storage material having high heat storage/release efficiency in a large scale.

The invention relates to a micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance. Compared with a three-ring power hanging control, the micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance comprises the steps that: inverter virtual connection impedance Zvir(s) is serially connected between the output current and the reference voltage signals of an inverter; the inverter virtual connection impedance Zvir(s) is equivalent to be a hanging coefficient, so that the output current of the inverter is fed back to the output voltage of the inverter through the virtual connection impedance to be fixed, and further, the purpose of automatically splitting the load power of a parallel inverter system is achieved. The micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance eliminates the defects that a traditional three-ring power hanging controller is sensitive to the connection impedance and the control system is complicated, so that the parallel distributed power supplies in a micro-grid can still realize good power splitting effect when the circuit is short and the impedance is small, the stable margin of the system is improved, and the power supply quality of the loads is ensured.

Antibody formulations are described comprising a mixture of a non-reducing sugar, an anti-α4β7 antibody and at least one amino acid. The disclosed formulations have improved stability, reduced aggregate formation, and may retard degradation of the anti-α4β7 antibody therein or exhibit any combinations thereof. The present invention further provides a safe dosing regimen of these antibody formulations that is easy to follow, and which results in a therapeutically effective amount of the anti-α4β7 antibody in vivo.

The invention discloses a novel two-wheeled self-balancing electrombile, which is characterized by being provided with two side-by-side wheels capable of rotating independently. The two wheels are connected through a connection mechanism and can tilt leftwards or rightwards conformably through the connection mechanism. Tilting of the two wheels enables the electrombile to swerve, and when the two wheels tilt, the connection mechanism can still enable pedals to maintain level. Each wheel is driven by a motor and further provided with an electronic control system which enables the pedals of the electrombile to maintain horizontal balance in the front direction and the back direction. When the gravity center of an electrombile rider tilts forwards, backwards or towards two sides, the electrombile can be directly led to advance towards the tilting direction. In addition, some designs capable of improving electrombile stability and portability are further provided.

The invention is in the field of Computer Engineering and can be used in memory devices for various computers, specifically in developing a universal memory system with high data reading and writing speed along with capabilities for long term storage and high information density, as well as in developing video and audio equipment of a new generation, in developing associative memory systems, and in creating synapses (electric circuit elements with programmable electric resistance) for neuronal nets. The lack of such an element holds back the development of true neuronal computers. The invention is based on the task of creating an essentially new kind of memory cell that would allow to store several bits of data, would have fast resistance switching and require low operating voltage but at the same time would allow to combine its manufacturing technology with the modern semiconductor manufacturing technology. FIG. 6 shows an implementation option of the claimed memory cell containing two continuous aluminum electrodes 1 and 2 between which there is a multilayer functional zone consisting of one active layer 3, one barrier layer 4 and one passive layer 5. This structure of the functional zone allows to change electric resistance of the active zone and/or form highly conductive areas or lines with metallic conduction in the active zone under the influence of the external electric field and/or its light emission on the memory cell and to retain its electric resistance for long periods of time without applying external electric fields. The memory cell is advantageously distinctive from the currently used single bit memory elements, in that it can store several bits of information. The data storage time depends on the memory cell structure, the material used for the functional zone and the writing mode. It can vary from several seconds (can be used to build dynamic memory) to several years (can be used for building long term memory, such as Flash memory). It is possible to create universal memory that can work in both dynamic and long-term modes, depending on the data-writing mode.

The present invention is directed to devices and methods of using a surgical drain, and more particularly to a surgical drain having at least one sensor for monitoring and/or recording the condition of the anatomical site or fluid emitted from the site where the surgical drain is placed. The invention may also include modifications of the surgical drain to improve stabilization or immobilization in the proximity of the anatomical site to be monitored.

The invention provides a digitalized alternating-current voltage and speed regulation device. The digitalized alternating-current voltage and speed regulation device comprises an input signal interface circuit and an output signal interface circuit of a power circuit, a pulse trigger circuit, a key and menu display circuit and singlechips ATmega128 and ATmega8. According to the requirements of the present market and the on-site use environment, a full-digital voltage and speed regulation system is developed based on the original analog quantity voltage and speed regulation system. The system has the following basic functions: (1) due to digitalized control, the stability of the system is enhanced, and drifting of parameters due to null shifting of an amplifier and vibration of a potentiometer can be avoided; 2) the system is convenient to debug, the parameter can be directly input by using a personal computer (PC) through a human-machine interface or the parameter can be configured bya shortcut key of a control panel, the operation is quick and the debugging time can be shortened; 3) the human-machine interface monitors working states such as current, voltage, speed and the like during running of a motor in real time; and 4) by fault self-diagnosis and memory monitoring functions, the control panel displays a type code of a fault when the system is faulted, so that a user canfind out the fault conveniently.

The invention discloses a grid-connected control method and system based on a virtual synchronous generator. The method comprises the steps as follows: simulating synchronous impedance with a synchronous impedance method based on cascade connection of an order-reduced resonator and a three-order generalized integrator to improve stability of the system, inhibit current deviation formed by load disturbance and realize power equalization, and inhibiting imbalance of output voltage and harmonic component by using quasi-proportional resonance controller. An order-reduced resonator phase-locked loop is combined with a quasi-synchronous parallel algorithm, asymmetry of grid voltage and output voltage of an inverter as well as the effect of harmonic waves on detection accuracy is avoided, the frequency, amplitude and phase of the output voltage of the virtual synchronous inverter track grid voltage quickly without static errors by the aid of the quasi-synchronous parallel algorithm, so that flexible off-grid/grid-connected switching is realized, the power supply reliability of the system is improved, and the electric energy quality is improved.

The invention discloses a metal organic skeleton structure material load platinum catalyst. The metal organic skeleton structure material load platinum catalyst comprises a carrier and an active component loaded on the carrier, wherein the carrier is a metal organic skeleton structure material MIL-101, and the active component is platinum. The invention also discloses a preparation method of the metal organic skeleton structure material load platinum catalyst and a catalytic hydrogenation application thereof. The catalyst provided by the invention has a higher specific surface area and a larger porthole structure, the catalyst is suitable for application in a catalytic hydrogenation reaction, the catalyst is environmentally-friendly, the reaction conditions are gentle, and the catalyst is high in efficiency and good in stability.

A core-shell catalyst material can include a core and a shell material. Each of the core material and the shell material can have crystal structures and lattice parameters which allow for a substantially coherent core-shell interface. The shell material can include a catalytically active metal. The circumferential stress of the shell material, Gee, at the core-shell interface and at the shell surface, is greater than 0 (tensile) or can be compressive of a lower magnitude than a catalyst made of the shell material alone. The crystal structures of the core material can often be the same as the shell material, although this is not always required.

The invention relates to a heat-resistant and salt-resistant polymer thickening agent and a preparation method thereof. The thickening agent is generated by copolymerization of water-soluble compound with olefin groups and maleimide compound. The thickening agent has high viscosity in water body with high mineralized degree and positive divalent ion concentration and has better viscosity maintaining performance under the conditions of high temperature, high shear strength and high shear frequency, thus meeting the technical requirements for the thickening agent under the conditions of high temperature and high salinity in tertiary oil recovery at present, and improving the recovery ratio of a II or III type of oil reservoir in the tertiary oil recovery.

A CMOS static random access memory (SRAM) cell array, an integrated chip including the array and a method of accessing cells in the array with improved cell stability. Bit lines connected to half selected cells in the array are floated during cell accesses for improved cell stability

This invention discloses a method and a device for strengthening safety of protocol messages, in which, the device includes a message receiving module, a buffer storage modull, a message despatch module, a message process module, a sorting mapping module and a configuratioin module, first of all, the configuration module sets different priorities for different kinds of messages, and the message needing to be processed mostly has the maximum priority and related receiving queues are set for different priority messages in the buffer stored module, after receiving the message, the mapping module first of all decides the kind of the message, then maps the message to the receiving queue corresponding to the priority of the buffer module then again the message despatch module transmits messages in the receiving queue with higher priorities to the processor according to the despatch algorithm, which can transmit protocol messages to CPU in three-layer network devices.

The invention discloses a preparation method for rate type artificial graphite negative-pole material with high energy density. The preparation method comprises the following steps: subjecting raw material cokes to coarse breaking and pulverizing directly or coarse breaking, high-temperature modifying and then pulverizing, and carrying out reshaping treatment, so as to obtain primary granules A; kneading the primary granules A and an organic carbon source, then, carrying out dynamic thermal coating, and carrying out screening, so as to obtain primary granules B; uniformly mixing the primary granules A with a binder, then, subjecting the mixture to granulating in a granulating reactor, and carrying out screening, so as to obtain secondary granules C; subjecting the primary granules B and the secondary granules C to graphitizing separately, and carrying out screening, so as to obtain graphitized primary granules B and graphitized secondary granules C; and uniformly mixing the graphitizedprimary granules B and the graphitized secondary granules C proportionally, and carrying out screening, thereby obtaining a finished product. The preparation method is simple in process and easy in quality control; and by applying the artificial graphite negative-pole material prepared by adopting the method to a lithium-ion battery, the lithium-ion battery is large in capacity, good in cycle andexcellent in quick charging performance.

An organic electroluminescence material composition including a solvent represented by the following formula (1) and an anthracene derivative:

• wherein ring A is an aliphatic ring or an aromatic ring having 4 to 8 carbon atoms; R¹ is a substituent on the ring A; and
• R² and R³ are substituents connected to adjacent carbon atoms on the ring A.

The invention provides a composite chemical oil displacement agent for tertiary oil recovery in an oil field. The oil displacement agent comprises an anion surfactant, a cation surfactant and a nonionic surfactant. The oil displacement agent is characterized in that the cation surfactant consists of branched chain alkyl quaternary ammonium salt and chlorine ions or bromine ions; the anion surfactant is hybridized sulfonate or sulfate or carboxylate with multiple ethylene oxide (EO) groups; the nonionic surfactant is a surfactant with a branched chain hydrophobic group and an EO group; and the raw materials are evenly stirred in a kettle so as to obtain the composite oil displacement agent. Through formation of zwitterion pairs, the composite displacement agent can form a compact interface absorption film, and the stability of the composite displacement agent is improved because a non-ionic surfactant is added, so that the composite displacement agent is not easy to precipitate.

A chemical and biological transducer is prepared by setting two long period fibre gratings, fibre covering and fibre core on one piece of fibre to form a MZ interferometer and then plating a metal film on fibre covering surface to form SPR transducer of fibre MZ interferometer structure. The sensing system comprises wide band light source, fibre, chemical and biological transducer formed as above, fibre spectrograph and computer as said transducer is set in gas or solution of chemical composition or biological molecule to be tested.

The invention discloses a distributed photovoltaic power generation regional integrated control system, which comprises a photovoltaic cell array, a distributed inverter control system, a sensor network, an intra-region electric control system, a regional integrated control center system and a power dispatching control center, wherein the photovoltaic cell array converts photovoltaic energy into direct current electric energy; the distributed inverter control system is used for control over the photovoltaic cell array and direct current inversion; the sensor network and the intra-region electric control system are used for monitoring and controlling each piece of electric equipment in a region and ensuring the safety of electric facilities; the regional integrated control center system manages power generation running and centralized grid connection in the region; and the power dispatching control center is used for regional status monitoring and power dispatching. By the system, low-power distributed photovoltaic power generation devices in a certain region can be connected with one another for centralized grid connection management and accept the dispatching of the power dispatching control center to realize a flexible, high-efficiency and reliable utilization form for photovoltaic power, the remote parameter measurement and control of a photovoltaic power generation system and the power dispatching.

The invention provides a bionic double-joint flapping wing air vehicle and belongs to the field of aerospace. The bionic double-joint flapping wing air vehicle comprises a fuselage, a flapping wing driving device, a main wing, an aileron, a main wing joint, an aileron joint, an empennage driving device and an empennage. The bionic double-joint flapping wing air vehicle is characterized in that the fuselage comprises a fuselage transverse beam and two fuselage frameworks, wherein the two same fuselage frameworks are arrayed in parallel and are fixedly connected with the fuselage transverse beam; the fuselage transverse beam penetrates through the centers of the fuselage frameworks. The flapping wing driving device is fixedly connected with the fuselage frameworks; the main wing is connected with the fuselage frameworks by the main wing joint; the main wing can rotate relatively around the fuselage frameworks by taking the main wing joint as a rotary axis. The aileron is connected with the main wing by the aileron joint; the aileron can rotate relatively around the main wing by taking the main wing joint and the aileron joint as rotary axes. The empennage driving device 5 is fixedly arranged at the rear end of the fuselage transverse beam and the empennage is connected with the empennage driving device. According to the double-joint bionic flapping wing air vehicle, left and right flapping wing devices are fully symmetrical and the flight stability is improved.

The invention discloses a reactive coordination control method for a direct current converter alternating current filter and a phase modifier. The reactive coordination control method comprises the steps of reserving enough dynamic reactive power storage for operating points of the phase modifier in a steady-state condition of a direct current converter alternating current voltage; for ensuring the dynamic reactive power storage of the phase modifier while a condition of switching of the alternating current filter is needed, controlling the phase modifier to act in advance, controlling the reactive power increasing or decreasing direction to be opposite to the reactive power changing direction caused by switching of the alternating current filter, so as to reduce alternating current voltage fluctuation caused by switching of the alternating current filter; and under the condition of the direct current converter alternating current voltage fluctuation, if the extremity of the phase modifier is reached while the alternating current voltage still cannot be regulated to a preset value, performing rapid switching of the alternating current filter for ensuring stability of the alternating current voltage. By virtue of the reactive coordination control method, the technical problem of not high coordination degree between the phase modifier and the direct current converter reactive compensation equipment in the prior art is solved, and the stability of an alternating current and direct current parallel serial system can be reinforced.

In a linkage mechanism between a trigger valve and a control valve in a nail gun, the control valve is disposed on a main body of the nail gun. A valve plug of the control valve adjoins to a safety rod of the nail gun. A trigger valve is mounted on the main body and an outer trigger is disposed adjacent to the trigger valve. A valve stem of the trigger valve is extended in the outer trigger. An inner trigger is pivotably connected to a bottom end of the valve stem. An end of a rod member is slidably disposed at a side of the outer trigger and another end of the rod member is connected between the valve plug and the safety rod with an arm. A stopping portion is formed at a middle portion of the rod member. The stopping portion is configured for pressing the outer trigger so as to drive the inner trigger to push the rod member, the arm, the valve plug and the safety rod to move along a nail driving direction of the nail gun. The present linkage mechanism can improve a stability of controlling of nail shooting action and a durability of the nail gun.

The invention discloses an electric system low-frequency oscillation mode parameter identification method. The method includes the steps that firstly, interconnecting tie power signals recorded by a wide-area measuring system in an electric system are read; the read power signals are processed, and then corresponding power fluctuation signals are acquired; then the fluctuation signals serve as input signals based on the random decrement technology, and free attenuation response signals of the system are acquired; finally, based on a total least square rotation invariant sub-space parameter estimation method, mode identification is conducted on the free attenuation response signals, low-frequency oscillation mode frequency and the damping ratio are identified, and the electric system low-frequency oscillation mode parameter identification method based on the random response signals has the technical advantages of being high in noise immunity and identification accuracy.

A liquid core crystal compound for polymerizing the distribution process is provided, which comprises at least a liquid crystal molecule, at least a reactive monomer and an inhibitor with weight concentration range 0.01wt per cent to 1wt per cent of the reactive monomer content. The inhibitor quenches free radicals and polyreaction produced by the reactive monomer due to lighting or heat effect before polymerizing the distribution process, therefore reducing the reaction of the reactive monomer before polymerizing the distribution process and greatly improving the stability of the liquid core crystal compound.

The invention relates to a method for 1/3 coking coal to participate in coking and blending coal. The method comprises the following steps: (1) detecting the 1/3 coking coal; (2) classifying the 1/3 coking coal according to a detection result of the step (1); and (3) blending the coal. The invention carries out reasonable classifying and blending according to the 1/3 coking coal of each mineral site by characteristics, such as coal rock indexes, technological properties, a microstructure and the like, divides the 1/3 coking coal into four classes, controls the weight percent of each class of 1/3 coking coal in coking and blending coal and enhances the quality stability of coke.

The invention relates to a gemcitabine hydrochloride lyophilized powder injection and a preparation method thereof. The gemcitabine hydrochloride lyophilized powder injection prepared by the method can be used as a therapeutic medicament for treating middle and late non-small cell lung cancer, pancreatic cancer and the like. The gemcitabine hydrochloride lyophilized powder injection is characterized by consisting of gemcitabine hydrochloride, mannitol and sodium acetate, wherein the weight ratio of the gemcitabine hydrochloride to the mannitol is 1:0.5-5, and the weight ratio of the gemcitabine hydrochloride to the sodium acetate is 1:0.01-0.1. The preparation method comprises the following steps: taking the mannitol and the sodium acetate; dissolving the mannitol and the sodium acetate by adding injection water; adding the gemcitabine hydrochloride to the mixture, stirring and dissolving the mixture, and adjusting the pH to between 2.7 and 3.3; fixing the volume; filtering the product by a 0.22 mu m microporous membrane; filling, dishing up, lyophilizing, and compressing; taking the product out of a box, and tying the product with an aluminum-plastic composite cover; and inspecting the quality, and packaging the product after passing the quality inspection to obtain the gemcitabine hydrochloride lyophilized powder injection.