摘要：This paper deals with the design of bidirectional coupler for broadband power line communication and the impedance matching technique with the power line. This coupler can be used for both transmitting and receiving the data, acting as transceiver. The impedance mismatching problem is also solved here using line trap circuit. The coupler circuit is capable of transmitting or receiving modulated signals with carrier frequency of 15 MHz which can be used for domestic as well as distribution power networks. Laboratory prototype tested using power line network consists of electrical household appliances and results show that the circuit is able to facilitate bidirectional band pass transmission.

摘要：Laboratory tests were conducted at the Irrigation Devices and Equipment’s Test Laboratory, Agricultural Engineering Research Institute, Agriculture Research Center, Giza, Egypt. The experimental design of laboratory experiments was split in randomized complete block design with three replicates. Laboratory tests carried out on three irrigation lateral lines of 40, 60, 80 m under the following three drip irrigation circuit (DIC) designs;1) one manifold for lateral lines or closed circuits with one manifold of drip irrigation system (CM1DIS);2) closed circuits with two manifolds for lateral lines (CM2DIS), and 3) traditional drip irrigation system (TDIS) as a control. The aims of the work were to study the effect of drip irrigation circuits (DIC) and lateral lines lengths (LLL;where): (LLL1 = 40 m, LLL2 = 60 m, and LLL3 = 80 m) on pressure head (PH) and friction loss (FL). Regarding to LLL and according to PH values, DIC designs could be ranked in the following ascending order: TDIS 1DIS 2DIS. The differences in PH among DIC designs were significant at the 1% level. The depressive effects of LLL on PH could be ranked in the following ascending order: LLL1 2 ≤ LLL3. Differences in PH among LLL treatments were significant at the 1% level except that between LLL2 and LLL3. The effects of interactions among: DIC × LLL on PH were significant at the 1% level with some exceptions. The highest value of PH (9.5 m) and the lowest one (6.05 m) were achieved in the interactions of CM2DIS × LLL1 and TDIS × LLL3, respectively. The shapes of the energy gradient lines were affected by DIC and LLL treatments used through their effect on ?H/H ratio. However, they followed similar trends. According to the FL values, DIC and LLL treatments could be ranked in the following descending orders TDIS > CM1DIS > CM2DIS and LLL1 > LLL2 > LLL3. The differences in FL among DIC and LLL were significant and the effects of interactions among DIC × LLL on FL were significant at the 1% level. The maxim

摘要：circuit Suds宣布推出一种非挥发性环境安全电路板清洗剂。此新设计的解决方案将代替要求进行特殊处理和处置的前代清洗剂。与其它酒精或溶剂清洗剂不同，circuit Suds属非易燃品，在大多数应用中的清洗效果较之前解决方案更为显着，并且无需进行排烟或特殊有毒处理。

摘要：日前，德州仪器（TI）宣布其完成了对Integrated circuit Designs公司（ICD）的收购，后者是一家私人控股的射频集成电路专业设计公司。将ICD的设计专业技术与TI各种高性能模拟与低功耗微控制器产品系列相结合，将有助于TI更好地为工业、商业与消费类应用提供业界领先的低功耗RF解决方案。

摘要：Synthetic biology aims to endow living cells with new functions by incorporating functional gene networks into *** overexpressing,blocking and rewiring native gene pathways,synthetic biologists have harnessed this promising technology to reprogram cells to perform diverse tasks such as drug discovery,biopharmaceutical manufacturing,gene therapy and tissue engineering,*** this review,we focus on current technologies of synthetic biosensors for disease *** start with the design principle of synthetic *** we move towards the characteristics of simple synthetic biosensors,which can respond to a single input signal,and complex synthetic biosensors including Boolean gate biosensors,cascade biosensors,time-delay biosensors,oscillator biosensors and hysteretic biosensors,which can respond to more than two input signals and perform complex *** biosensor has showed great potential in disease detection,but it is still in its infancy *** efforts should be made in identifying and constructing clinically relevant regulation *** tools are also needed in the design process in order to guarantee the precision of the synthetic *** ultimate goal of a synthetic biosensor is to act as a therapeutic sensor-effector device that connects diagnostic input with therapeutic output and therefore provides all-in-one diagnostic and therapeutic solutions for future gene-and cell-based therapies.

摘要：烟台是清末民国时期中国抽纱花边出口量最大、行业发展最为繁荣的地区。在烟台牟平现存一册英文版抽纱花边样本,内有样品共5大类863枚。笔者考证,应为1913年至1941年之间烟台"胶东道实业公司"制作,是笔者所见国内现存最早的抽纱花边样品集。作为20世纪上半叶中国抽纱花边业繁荣历史的见证,该样本的样品数量和种类丰富,工艺特色鲜明、制作精良,样品的装饰性强,不仅具有明显的西式风格,且为后世同类产品一脉传承,为近现代艺术设计、工艺美术史的研究提供了较为珍贵的实物资料。

摘要：This paper provides a comprehensive review of the recent development on the switched reluctance machine operating in generating mode in both the low and high speed operations. The machine consists of a salient rotor and stator poles and controlled via switching of the power electronic devices. There is a steady development of the machine operating in the motoring mode;however, its generating operation is still under study. This paper gives an overview of the machine, followed by the principle of operation in generating mode and briefly discusses the structure and types of control methods which involve the switched reluctance generator (SRG). Due to its geometry simplicity and advantages such as robust, ability to operate over a wide speed range and absence of permanent magnet and windings on the rotor, the SRG promises to be a good candidate for variable speed application.

摘要：设计一种高精度轨对轨CMOS峰值检测电路.基于信号"先缩小后放大",在MOS采样开关管控制下电源对存储电容充电,该电路实现了轨对轨峰值检测,降低了检测电路的工作电流,提高了MOS开关管的速度和峰值检测的精度.该电路设计基于CSMC0.5μm CMOS工艺,采用了5 V单电源,检测精度小于1 mV,检测电压范围为0～5 V,整个检测电路的静态电流消耗为2 mA,正常工作频率为0.1 Hz～10 KHz.

摘要：This paper presents a method for designing a class of countermeasures for DPA attacks based on attenuation of current variations. In this class of countermeasures, designers aim at decreasing the dynamic current variations to reduce the information that can be extracted from the current consumption of secure microsystems. The proposed method is based on a novel formula that calculates the number of current traces required for a successful DPA attack using the characteristics of the microsystem current signal and the external noise of the measurement setup. The different stages of the proposed method are illustrated through designing an example current flattening circuit. Meanwhile validity and applicability of the proposed formula is verified by comparing theoretical results with those obtained experimentally for the example circuit. The proposed formula not only estimates the required level of attenuation for a target level of robustness defined by design requirements, it also predicts the effectiveness of a countermeasure using simulation results therefore dramatically reducing the time to design of secure microsystems.

摘要：A common current source, generally used to bias cross-coupled differential amplifiers in a transconductor, controls third harmonic distortion (HD3) poorly. Separate current sources are shown to provide better control on HD3) . In this paper, a detailed design and analysis is presented for a transconductor made using this biasing technique. The transconductor, in addition, is made to offer high Gm, low power dissipation and is designed for linearly tunable Gm with current mode load as one of the applications. The circuit exhibits HD3) of less than –43.7 dB, high current efficiency of 1.18 V-1 and Gm of 390 μS at 1 VGp-p @ 50 MHz. UMC 0.18 μm CMOS process technology is used for simulation at supply voltage of 1.8 V.