45 results about "Memory behavior" patented technology

A method and apparatus for caged stent delivery is provided herein. The device can be used to position and deliver any type of stent to a preselected treatment site within an intraluminal cavity. The device comprises a tubular portion, a plurality of arms attached to the distal end of the tubular portion, and a mechanism to open the arms. In operation, the caged device carries a stent in a constricted form to the treatment site for deployment. The arms of the cage are then opened, the stent released and deployed, and the device withdrawn. Several methods are provided to open the arms, including various pullwires, a piston, an electrolytic joint, and an activator. The arms may be constructed of a shape memory alloy and opened when shape memory behavior is effected. The device may be used with conventional catheters or used with a stent-loaded guidewire.

Disclosed herein is a nickel-titanium alloy comprising nickel, titanium, and at least one rare earth element. The nickel-titanium alloy comprises from about 34 at. % to about 60 at. % nickel, from about 34 at. % to about 60 at. % titanium, and from about 0.1 at. % to about 15 at. % at least one rare earth element. The nickel-titanium alloy may further include one or more additional alloying elements. In addition to radiopacity, the nickel-titanium alloy preferably exhibits superelastic or shape memory behavior. Medical devices comprising the nickel-titanium alloy and a method of making them are also disclosed.

An apparatus for processing data 2 includes a memory 4 having a plurality of memory regions 28 to 38. A mapping controller 56 applies a variable mapping to map memory addresses of access requests to different regions within the memory 4. The mapping controller varies the mapping applied in dependence upon both one or more memory behavioral parameters indicative of behavioral characteristics of the different regions and one or more access behavioral parameters indicative of behavioral characteristics of an access request to be mapped. The memory behavioral parameters may include the temperature of the regions and/or the refresh period of the regions. The access behavior able parameters may include the quality of service level, the access frequency, the access volume and/or the identity of the source of the access request.

The invention belongs to the technical field of information storage, and particularly relates to a memristor based on a pn heterostructure and a manufacturing method of the memristor. The memristor comprises an upper electrode and a lower electrode, and the pn heterostructure composed of p-type oxide (such as CuAlO2 and NiO) and n-type oxide (such as ZnO and TiO2) is inserted between the upper electrode and the lower electrode. Positive bias voltages are continuously applied to the lower electrode, and oxygen ions in a depletion layer can be gradually migrated to one side of a p-type region from an n-type region. The vacancy concentration of positive ions on one side of the p-type region and the vacancy concentration of oxygen on one side of the n-type region are increased at the same time, the width of the depletion layer of a pn joint is gradually reduced, and therefore device resistance is gradually lowered, and the resistance memory behavior is achieved. The characteristic that the physical property of the pn joint is easy to modulate is utilized, and flexibility of regulating and controlling the resistance memory performance is increased. Selectivity on materials is poor, the performance of the resistance memory behavior is stable, the half-quantitative study on a resistance memory device is facilitated, and the basis is laid for device deign and further development.

The invention discloses soluble aliphatic chain-containing polyimide with adjustable information memory performance, and belongs to the field of organic information memory materials. The soluble aliphatic chain-containing polyimide is characterized in that two kinds of diamine with electronic property are compounded at first, the two kinds of diamine contain aliphatic chains in different lengths, and then the two kinds of diamine are respectively in polycondensation with dicarboxylic anhydride with electron acceptor property, so that the soluble aliphatic chain-containing polyimide with the soluble aliphatic chain-containing polyimide is prepared, and the structure of the soluble aliphatic chain-containing polyimide is as shown in a formula (I) shown in the description. The soluble aliphatic chain-containing polyimide disclosed by the invention has the advantages of stable memory performance and fast response speed, and an information memory behavior of a material can be controlled by changing the length of the aliphatic chains or the variety of the diamines; the soluble aliphatic chain-containing polyimide has good solubility and is beneficial for processing of the material and preparation of memory devices; meanwhile, a compounding method of the soluble aliphatic chain-containing polyimide is simple, the yield is high, device preparation is simple and easy, the efficiency is high, and a wide application prospect in the field of information memory materials are obtained.

A superelastic metal seal for use in a downhole tool, wherein the superelastic metal seal may be formed from a superelastic Ni—Ti alloy. The superelastic Ni—Ti alloy may be prestrained with a permanent strain. Superelasticity may be imparted to the superelastic Ni—Ti alloy through a thermal treatment process or through prestraining the superelastic Ni—Ti alloy. The superelastic Ni—Ti alloy may exhibit superelastic behavior. The superelastic Ni—Ti alloy may not exhibit shape memory behavior.

The invention discloses a red light responsive shape memory polymer material and a preparation method thereof, belonging to the technical field of functional materials. The polymer material provided by the invention is obtained by cross-linking reactive group-containing micelles, wrapping porphyrin, into a film; the polymer material is prepared from the following raw materials in parts by weight:20-40 parts of allyl monomer containing hydrophobic groups, 1-5 parts of allyl monomer containing hydrophilic groups, 1-5 parts of allyl monomer containing reactive groups, 2-5 parts of organic solvent, 0.5-1 part of radical initiator, 1-5 parts of cross-linking agent and 0.0005-0.005 part of porphyrin. The red light responsive shape memory polymer material is endowed with a red light responsive shape memory function invention by wrapping the porphyrin having a photothermal conversion function in the micelles, avoids the traditional contact type triggering response, and can realize the manipulation of the material shape memory behavior remotely; furthermore, as an organic compound inherent in a living body, the porphyrin does not cause harmful side effects to the living body; the red lightdoes not damage the skin when penetrating the living body, and the energy loss is less; therefore, the red light responsive shape memory polymer material is expected to be applied to the photothermaltreatment in the living body.

The invention discloses a mouse learning and memory behavior training and testing device. The device comprises a training box, wherein the inside of the training box is divided into a first training channel and a second training channel; blocking plates are mounted at the centers inside the first training channel and the second training channel. The mouse learning and memory behavior training andtesting device is scientific and reasonable in structure and safe and convenient to use; by functions of the first training channel, the second training channel, the blocking plates, partition platesand food storage rooms, experiment mice are induced by mouse grains to move; meanwhile, the blocking plates are used for blocking to enable routes to be bent and complicated, and accordingly, the experiment mice are trained to memorize the routes, certain spatial memory is produced; heating plates are added to the blocking plate in the second training channel to stimulate the experiment mice, so that time for the experiment mice to generate memory is shorter under stimulation, LED strong lights are regularly started inside the food storage rooms, the experiment mice can generate memory on time, and operation is simple and reliable.

A matrix display device comprises a matrix of optically addressable pixels (Pij) which comprise a light sensitive element (LSij) and a pixel light generating element (LGij). The light generating element (LGij) will produce a pixel light (LMij) with a brightness which depends on the state of the light sensitive element (LSij). The state of the light sensitive element (LSij) depends on the amount of light impinging on it. The actual brightness of the pixel light generating element (LGij) may further depend on a voltage across it. The pixels (Pij) are constructed such that a portion of the pixel light (PLMij) generated by the pixel light generating element (LGij) reaches the associated light sensitive element (LSij) of the pixel (Pij). The light sensitive element (LSij) is sensitive to the portion of the pixel light (PLMij) to obtain a feedback of the portion of the pixel light (PLMij) to the light sensitive element (LSij). This feedback may be used to obtain a memory behavior of the pixel (Pij) or to influence an intrinsic memory behavior of the pixel (Pij).

A radiopaque nitinol stent for implantation in a body lumen is disclosed. The stent is made from a superelastic alloy such as nickel-titanium or nitinol, and includes a ternary element including tungsten. The added tungsten in specified amounts improve the radiopacity of the nitinol stent comparable to that of a stainless steel stent of the same strut pattern coated with a thin layer of gold. Furthermore, the nitinol stent has improved radiopacity yet retains its superelastic and shape memory behavior and further maintains a thin strut/wall thickness for high flexibility.

The invention discloses an application of a VEGFR inhibitor in preparation of an anti-Alzheimer's disease medicine. The VEGFR inhibitor is axitinib and an analogue thereof. It is found that axitinib has an unexpected curative effect on Alzheimer's disease, and Alzheimer's disease model animal in-vivo experiments prove that after administration of axitinib, beta-amyloid protein deposition in the brain of a model animal is significantly reduced, the content of acetylcholin esterase is reduced, the oxidative stress level and inflammatory response of the lesion part of the model animal are relieved, the learning and memory ability and learning and memory behaviors of the model animal on space and direction are improved, and the curative effect is obviously higher than that of a clinical first-line treatment drug donepezil. The axitinib and the analogue thereof provide a new means for clinical treatment of the Alzheimer's disease, and the axitinib and the analogue thereof are high in human body safety, low in price and easy to prepare. According to the invention, non-intracranial administration mode is adopted, safety is high, administration is convenient and fast, and patient compliance is high. The application of a VEGFR inhibitor in preparation of an anti-Alzheimer's disease medicine has wide market prospects and great social significance.

The invention discloses a system and a method for optimizing a video encoding and decoding access memory. The system comprises an entropy encoder and an entropy decoder, wherein the entropy encoder is used for simulating a decoding access memory behavior in an entropy encoding process as well as acquiring decoding access memory behavior information and obtaining an access memory information queue, generating an access memory information auxiliary stream according to the access memory information queue and transmitting the access memory information auxiliary stream to the entropy decoder together with video data subjected to entropy encoding; and the entropy decoder is used for carrying out buffer memory optimal scheduling and decoding on encoded video data by utilizing the access memory information auxiliary stream after the a code stream to be decoded is received. The optimal scheduling of the on-chip buffer memory is achieved so as to greatly reduce the average access memory time delay and an off-chip access memory bandwidth.

The invention discloses a dynamic taint analysis-based system for extracting a plaintext of an encrypted application. The system comprises a taint data source locating module, a dynamic taint analysis module, an instruction analysis module and a memory behavior analysis module, wherein the taint data source locating module is used for obtaining a memory address of an encrypted message in system call and performing taint data source marking on the memory address; the dynamic taint analysis module is used for tracking a data source with a taint mark and reversely obtaining an execution track of an instruction for performing operation on the data source from the data source; the instruction analysis module is used for analyzing the instruction execution track and distinguishing message decryption and processing stages of taint data; and the memory behavior analysis module is used for obtaining a memory address of the taint data which is subjected to writing operation in the message decryption stage and is subjected to reading operation in the message processing stage, and extracting decrypted plaintext information from the memory address. By extracting the plaintext information from the encrypted application, the security monitoring of the encrypted application is improved.