41results about How to "Reduced band width" patented technology

An encrypting system to protect digital data and a method thereof are disclosed. During dispatching files to receivers, a compiler is used to add a file key on out-going file to form the first encrypted electronic text and to retrieve file abstract, and then the first encrypted electronic text is encrypted again with a public key to form the second encrypted electronic text which is stored into a database of a server. The file abstract as well as the file key is also encrypted by the public key before being sent to the receivers. The receivers then decrypt the encrypted file by the public key to obtain the original file abstract with which the receivers get the download permission from the server to download the second encrypted electronic text. The receivers then download and decrypt the second encrypted electronic text by the public key into the first encrypted electronic text which is then opened by the compiler by means of the file key to meet the purpose of protecting digital data.

The invention relates to a method and a device for transmitting information symbols using a plurality of carriers, wherein a first transmission symbol is produced (52, 54) on the basis of an information symbol. A second transmission symbol is also produced (52, 54) on the basis of the same information symbol, wherein the second transmission symbol differs from the first transmission symbol. The first and second transmission symbols are modulated (56) on a carrier and transmitted (62) at different intervals. The invention further relates to a method and a device for receiving information symbols represented by the first and second information symbols, wherein both transmission symbols received are used in order to extract the information symbol contained in both transmission symbols.

A scan-type display device control circuit is suitable for receiving successive frame data and driving a light-emitting diode (LED) display device accordingly. The scan-type display device control circuit includes a ping-pong buffer, a data storage controller, a line scan controller, a display buffer, and a scrambled pulse width modulation (PMW) signal generating device. The scan-type display device control circuit can utilize frame data circularly and repeatedly, so as to prevent a great mass of data from being transmitted repeatedly. Therefore, a band width for inputting data can be reduced significantly. Furthermore, the scrambled PMW signal generating device can scramble a PMW signal with a long period into a plurality of scrambled PMW signals with a short period. Therefore, the refresh rate can be efficiently enhanced without changing the band width for inputting data.

To provide a biochip, a biochip manufacturing method, an electrophoresis method, and an electrophoresis apparatus, by which the detection accuracy may improve, there is a biochip introducing a sample in band form into a sample separation passage, by a means for reducing the band width of sample, at which the sample is before being introduced in the sample separation passage in band form. The band of sample supplied to the sample separation passage is compressed, and the expansion by diffusion may be prevented, thus the detection accuracy may improve.

Provided is a system and method for effectively multiplexing and streaming contents. The system may include a plurality of video packetized elementary stream (PES) packetizers to transform, to a video PES packet, elementary stream (ES) data encoded in a video encoder, a plurality of audio PES packetizers to transform, to an audio PES packet, ES data encoded in an audio encoder, a sync information generator to generate sync information for synchronizing each of decoded streams in a process of decoding a transport stream (TS) signal, and the TS packetizer to generate a plurality of program streams using the audio PES packet, the video PES packet, and the sync information, to generate program specific information (PSI) for a configuration of the plurality of program streams, and to insert the PSI between the plurality of program streams in a predetermined period to generate the TS signal.

A magnetic head-positioning servo system is provided to accurately test a magnetic disk with a track written in advance, by providing two fine actuators. The second fine actuator, to which a magnetic head is attached, is mounted on the first fine actuator. The second fine actuator has a larger generating displacement than a generating displacement of the first fine actuator, and lets the magnetic disk to follow the eccentricity of the track. In this way, the positioning accuracy can be increased.

A transponder module of a system for measurement of a race time includes a time base in a microcontroller, which is activated upon receipt of a low-frequency electromagnetic field signal from a transmission antenna of a measuring system which is disposed at the level of a line of passage. The microcontroller, once woken up, is capable of measuring several successive intensities of the captured electromagnetic field in order to reconstruct a curve of the electromagnetic field and to determine a crossing time on the line of passage of the transponder module with the activated time base thereof in order to transmit, to a decoder unit of the measuring system, a signal of the result of the time of crossing determined by the microcontroller.

A method and apparatus for determining the safety of a gas mixture containing flammable components such as methane together with ethane or other hydrocarbon, together with a diluent gas. The method includes the filtered infrared spectroscopy of the gas mixture in a gas cell using a filter. The peak transmission wavelength and bandwidth of the filter are so chosen to provide an output, when an infrared light source having a flat wavelength distribution is used, indicative of the % LEL of the gas mixture, within a predetermined tolerance. The filter may be a gas correlation filter containing a mixture of methane and ethane, together with a diluent gas.

An electromotive drive, in particular for a pump for an electrohydraulic vehicle steering device, has a motor mounting, which has a cylindrical pin, and a stator having drive coils. The stator is penetrated by the cylindrical pin of the motor mounting and is held thereby. Between the inner wall of the stator and the outer wall of the cylindrical pin of the motor mounting a tolerance ring is arranged, a torque transmission taking place between stator and motor mounting via the tolerance ring.

The invention relates to a method for using zinc electroplating sludge to prepare an azo dyes photocatalyst. The method comprises the steps: using the electroplating sludge as the raw material, preparing the photocatalyst by roasting, and catalyzing and degrading the azo dyes in the visible light. The polluted water can be directly discharged into the river after treated to reach the discharge standard. The method is capable of effectively recycling the electroplating sludge, and simply, high-efficiently and safely treating the polluted water of the azo dyes.

The invention belongs to the technical field of degrading organic pollutants in wastewater by multiphase photocatalytic oxidation technology, and particularly relates to a nano titanium dioxide photocatalyst capable of degrading phenolic pollutants in the wastewater, and a preparation method of the nano titanium dioxide photocatalyst comprises preparation of a composite material containing graphite oxide powder, processing of nano titanium dioxide particles and synthesis of the nano titanium dioxide photocatalyst. Compared with the prior art, the nano titanium dioxide photocatalyst has the following advantages: doping levels can be formed by effective compounding, effective charge separation is increased, the energy band width of the titanium dioxide is reduced, light transmittance is increased, light utilization rate of the catalyst is increased, photo-corrosion phenomenons can be avoided, the pollutants can be quickly adsorbed, due to a larger specific surface area and a high-void structure of the nano titanium dioxide photocatalyst, more pollutant molecules can be adsorbed, and degradation effect of the phenolic pollutants in the wastewater can be improved.

The invention discloses a Si-C-N composite negative pole material and a preparation method thereof and belongs to the field of lithium ion battery negative pole materials. The preparation method comprises the following steps of heating a mixture of a Si source and an N source to a temperature of 600-1000 DEG C at a heating rate of 0.5-10 DEG C/min in an Ar atmosphere, carrying out sintering at a temperature of 600-1000 DEG C for 3-15h, carrying out cooling to a room temperature to obtain an N-doped Si-based material, mixing the N-doped Si-based material and graphite to obtain a uniform mixture, heating the mixture of the N-doped Si-based material and graphite to a temperature of 500-900 DEG C at a heating rate of 0.5-10 DEG C/min in an N atmosphere, carrying out sintering at a temperature of 500-900 DEG C for 1-10h, and carrying out cooling to a room temperature to obtain the Si-C-N composite negative pole material. Through use of N in the Si material, Si material bandwidth is reduced and conductivity is improved. Through coating of the N-doped Si-based material with graphite, volume effects of the Si material is effectively buffered. The Si-C-N composite negative pole material has excellent multiplying power performances and cycle stability.

The invention belongs to the field of microcrystalline materials, and in particular relates to microcrystalline material MgCaO powder as well as a preparation method and an application thereof. The microcrystalline material MgCaO powder is characterized in that the specific gravity ratio of Mg, Ca and O in the MgCaO powder is shown as xMg(1-x)CaxO, wherein x is greater than or equal to 0.04 and less than or equal to 0.3; the MgCaO powder is formed by sintering CaO powder and MgO powder. A microcrystalline material is formed after the MgCaO powder is dissolved in a solvent. When the microcrystalline material containing the MgCaO powder is applied into a plasma panel, the low energy band width is maintained while the stable state of environmental gases is kept. The preparation method is low in cost, simple and easy to operate.