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Now showing items 1 - 16 of 1423

  • METHOD AND SYSTEM FOR CONVERTING PCB FILE TO GERBER FILE

    Provided are a method and system for converting a PCB file to a Gerber file, said method comprising the following steps: obtaining a to-be-converted PCB file (S101); identifying the filename extension and design version of the PCB file (S102); according to the filename extension and design version, invoking a conversion software corresponding to the PCB file (S103); opening the PCB file by means of the PCB file conversion software (S104); converting the PCB file to a conversion file comprising a Gerber file (S105); compressing the conversion file, then obtaining a Gerber-file compressed package (S106). After obtaining the PCB file, the filename extension and design version of the PCB file are identified automatically, and a corresponding PCB conversion software is automatically selected and automatically opened; the conversion to a conversion file comprising a Gerber file takes place automatically, then the conversion file comprising the Gerber file is compressed to form a Gerber file compressed package, and is outputted. In contrast to conventional means whereby a PCB file is manually identified and the PCB file is manually converted, the described method for converting a PCB file to a Gerber file significantly economizes human labor and physical resources, and greatly improves operating efficiency.
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  • TOOL FOR JET PACKING AND FRACTURING AND TUBULAR COLUMN COMPRISING SAME

    A tool for jet packing and fracturing and a tubular column comprising the same. The tool comprises an upper connector (1), a connecting sleeve (2), a central rod (3), a packer (4), a lower connector (5), and an inner cylinder (6). The upper connector is provided with a circulation hole (9), a jet nozzle (7) is disposed at the circulation hole, and the inner cylinder is disposed on the inner wall of the upper connector to seal the jet nozzle. Under the action of a pressure liquid, the inner cylinder moves downwards and is exposed out of the jet nozzle, and the packer conducts packing. Then, perforation can be implemented by means of the jet nozzle. After perforation is completed, the jet nozzle is structured in the mode that the jet nozzle can disengage from the circulation hole, and thus fracturing work is carried out. By means of the tool, the working costs can be reduced, and the transformation effect can be improved.
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  • EMULATED CARD SWITCHING METHOD AND DEVICE OF NFC MOBILE TERMINAL

    Disclosed are an emulated card switching method and device of an NFC mobile terminal. The method comprises: obtaining current attitude information of an NFC mobile terminal; determining a target emulated card identity corresponding to the current attitude information on the basis of a pre-stored mapping relationship between attitude information and emulated card identities and the obtained current attitude information; and switching to a target emulated card corresponding to the target emulated card identity. Also disclosed is a corresponding emulated card switching device of an NFC mobile terminal. According to the technical solution provided in the embodiments of the present invention, a user does not need to switch an emulated card manually, and the emulated card switching steps of an NFC mobile terminal are simplified, thus saving the time for emulated card switching for the user.
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  • UMTS HOMOGENEOUS NETWORK-BASED UPLINK POWER CONTROL METHOD AND DEVICE

    A UMTS homogeneous network-based uplink power control method and device. The method comprises: an RNC periodically calculating a Maximum Imbalance between Uplink and Downlink (MIUD) between a serving cell and a neighboring cell with a low uplink load; monitoring a measurement report reported by a UE within the serving cell when the MIUD is greater than or equal to a preset threshold; when the UE requires adding a neighboring cell, of which an uplink load is lower than that of the serving cell, as an active set, configuring an uplink SIR target value at least greater than the MIUD for a radio link which is required to be added for soft handover of the UE, and reconfiguring RRC air interface radio parameters of related uplink services; and dynamically adjusting the uplink SIR target value of the radio link for soft handover of the UE in the serving cell according to a maximum difference between an SIR measured value of the serving cell and that of the neighboring cell with an uplink load lower than that of the serving cell, and the change of the MIUD.
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  • MICROBIAL STRAIN AND APPLICATION THEREOF IN PRODUCTION OF PU'ER TEA

    Provided are a yeast strain (Arxula adeninivorans, TMCC 70007 CGMCC No. 8683) capable of producing highly active polyphenol oxidase and a Lactobacillus pentosus capable of producing γ-aminobutyric acid (TMCC 70009 CGMCC No. 8685). The invention further provides a method for using the microbes for producing Pu'er tea, and a Pu'er tea produced using the method.
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  • WEARABLE DEVICE AND REAL-TIME STEP LENGTH MEASUREMENT METHOD FOR DEVICE

    A wearable device and a real-time step length measurement method for the device. A two-dimensional gait of a lower limb when a user walks and step length information of each step can be measured and outputted in real time, and the device and the method can be applied to detection of a gait asymmetry degree of the user. By using angular velocity and acceleration real-time data collected by four inertial sensor units, the lower-limb gesture and the step length of the user are computed and outputted by means of a geometric algorithm. The device is convenient to use, is not limited by sites, has low costs, can highly-accurately output the lower-limb gesture and the step length of the user in real time, and has high reliability and good promotion prospects.
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  • JITTER CIRCUIT USED IN HIGH-PRECISION ANALOGUE-TO-DIGITAL CONVERTER

    A jitter circuit used in a high-precision analogue-to-digital converter, comprising: a settable pseudo random sequence generator (1) for generating a pseudo random sequence signal which is uncorrelated to an analogue input signal Vi and is settable, wherein an n-bit signal therein is used as a digital jitter signal; a trimming module (2) for accurately positioning a trimming signal which controls a trimmable DAC circuit (3), so as to calibrate the trimmable DAC circuit (3); the trimmable DAC circuit (3) which is controlled by the trimming signal to convert the received digital jitter signal into an analogue jitter signal; a jitter signal introducing circuit (4) for receiving the analogue jitter signal and the analogue input signal Vi, outputting an analogue signal after processing, and introducing an input of an analogue-to-digital converter (10); and a jitter signal removing circuit (5) for receiving the digital jitter signal, and removing the jitter signal from an output of the analogue-to-digital converter to obtain a final data output result DOUT. The present invention effectively reduces the complexity of a high-precision ADC converter system, and is applicable in the high-precision ADC converter for improving the dynamic nonlinearity thereof.
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  • SYSTEM AND METHOD FOR ACHIEVING DUAL-NODE INTERCONNECTION PSEUDO-WIRE

    A system and method for achieving a dual-node interconnection pseudo-wire, relating to the technical field of wireless backhaul network applications; the system comprises two bridge nodes, at least one access side node, and at least one core side node; the two bridge nodes are respectively connected to each access side node and each core side node; the two bridge nodes are divided into a master node and a standby node, the master node and the standby node both being provided with an access side interface, a dual-node interconnection pseudo-wire side interface and a core side interface, any two interfaces on one bridge node being interconnected; a dual-node interconnection pseudo-wire side virtual circuit is provided between the master node and the standby node; an access side virtual circuit is respectively provided between the access side node and the master node and between the access side node and the standby node; the dual-node interconnection pseudo-wire side virtual circuit and the access side virtual circuit are bound in a dual-node interconnection pseudo-wire group; and an automatic protection switching signalling channel is superimposed respectively on the dual-node interconnection pseudo-wire side virtual circuit and on the access side virtual circuit.
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  • Detection of aphids in wheat fields using a computer vision technique

    Liu, Tao   Chen, Wen   Wu, Wei   Sun, Chengming   Guo, Wenshan   Zhu, Xinkai  

    Highlights • New method developed to detect aphids in wheat fields. • New method was compared with five other commonly used methods of aphid detection. • Performance analysed using images with different aphid density, colour, & location. • Method is easy-to-use and provides efficient and accurate aphid population data. • Method can be used for aphid infestation surveys in wheat fields. Aphids cause major damage in wheat fields resulting in significant yield losses. Monitoring aphid populations and the identification of aphid species provides important data related to pest population dynamics and integrated pest management. Manual identification and counting of wheat aphids is labour intensive, inefficient and subjective factors can influence its accuracy. A method of aphid identification and population monitoring based on digital images was developed. It used a maximally stable extremal region descriptor to simplify the background of field images containing aphids, and then used histograms of oriented gradient features and a support vector machine to develop an aphid identification model. This method was compared with five other commonly used methods of aphid detection; their performance was analysed using images with different aphid density, colour, or location on the plant. The results demonstrated that our new method provided mean identification and error rates of 86.81% and 8.91%, respectively, which is superior to other methods. The proposed method was easy-to-use and provides efficient and accurate aphid population data, and therefore can be used for aphid infestation surveys in wheat fields.
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  • C/KU WAVEBAND CONVERSION CONTROL SYSTEM AND COMMUNICATION METHOD THEREFOR

    The present invention relates to a C/KU waveband conversion control system, mainly comprising: a positioning module, a motor drive module, a control circuit module, a display module, a detection circuit module, a CPU main control circuit module, and a power supply module. The device is a satellite communication device which realizes communication in different wavebands using the same antenna surface. The device has a simple structure, is generally designed with open source hardware, and can realize rapid switching between a C waveband and a KU waveband, thus greatly reducing the weight of two communication systems and realizing one-vehicle-multiple-systems. Communication can be performed by selecting different waveband signals in a targeted way, in different regions under different environments, thus realizing the maximization of device functions and economic benefits.
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  • Understanding LiOH Chemistry in a Ruthenium Catalyzed Li-O2 Battery

    Liu, Tao   Liu, Zigeng   Kim, Gunwoo   Frith, James T   Garcia-Araez, Nuria   Grey, Clare  

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  • A Unified Indexing Strategy for the Mixed Data of a Future Marine GIS

    Liu, Tao   Han, Xie   Yang, Jie   Kuang, Liqun  

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  • Mutual regulation of MDM4 and TOP2A in cancer cell proliferation

    Liu, Tao   Zhang, Hailong   Yi, Sha   Gu, Lubing   Zhou, Muxiang  

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  • OsASN1 Plays a Critical Role in Asparagine-Dependent Rice Development

    Luo, Le   Qin, Ruyi   Liu, Tao   Yu, Ming   Yang, Tingwen   Xu, Guohua  

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  • Fe(Co)SiBPCCu nanocrystalline alloys with high B s above 1.83 T

    Liu, Tao   Kong, Fengyu   Xie, Lei   Wang, Anding   Chang, Chuntao   Wang, Xinmin   Liu, Chain-Tsuan  

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  • Understanding LiOH Chemistry in a Ruthenium Catalyzed Li-O2 Battery

    Liu, Tao   Liu, Zigeng   Kim, Gunwoo   Frith, James T   Garcia-Araez, Nuria   Grey, Clare  

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