The organization of behavior: A neuropsychological theory

This review article attempts to provide a comprehensive review of the recent progress in the so-called resistive random access memories (RRAMs) First, a brief introduction is presented to describe the construction and development of RRAMs, their potential for broad applications in the fields of nonvolatile memory, unconventional computing and logic devices, and the focus of research concerning RRAMs over the past decade Second, both inorganic and organic materials used in RRAMs are summarized, and their respective advantages and shortcomings are discussed Third, the important switching mechanisms are discussed in depth and are classified into ion migration, charge trapping/de-trapping, thermochemical reaction, exclusive mechanisms in inorganics, and exclusive mechanisms in organics Fourth, attention is given to the application of RRAMs for data storage, including their current performance, methods for performance enhancement, sneak-path issue and possible solutions, and demonstrations of 2-D and 3-D crossbar arrays Fifth, prospective applications of RRAMs in unconventional computing, as well as logic devices and multi-functionalization of RRAMs, are comprehensively summarized and thoroughly discussed The present review article ends with a short discussion concerning the challenges and future prospects of the RRAMs

Recent progress in resistive random access memories: Materials, switching mechanisms, and performance

Science and technologies based on terahertz frequency electromagnetic radiation (100 GHz–30 THz) have developed rapidly over the last 30 years. For most of the 20th Century, terahertz radiation, then referred to as sub-millimeter wave or far-infrared radiation, was mainly utilized by astronomers and some spectroscopists. Following the development of laser based terahertz time-domain spectroscopy in the 1980s and 1990s the field of THz science and technology expanded rapidly, to the extent that it now touches many areas from fundamental science to 'real world' applications. For example THz radiation is being used to optimize materials for new solar cells, and may also be a key technology for the next generation of airport security scanners. While the field was emerging it was possible to keep track of all new developments, however now the field has grown so much that it is increasingly difficult to follow the diverse range of new discoveries and applications that are appearing. At this point in time, when the field of THz science and technology is moving from an emerging to a more established and interdisciplinary field, it is apt to present a roadmap to help identify the breadth and future directions of the field. The aim of this roadmap is to present a snapshot of the present state of THz science and technology in 2017, and provide an opinion on the challenges and opportunities that the future holds. To be able to achieve this aim, we have invited a group of international experts to write 18 sections that cover most of the key areas of THz science and technology. We hope that The 2017 Roadmap on THz science and technology will prove to be a useful resource by providing a wide ranging introduction to the capabilities of THz radiation for those outside or just entering the field as well as providing perspective and breadth for those who are well established. We also feel that this review should serve as a useful guide for government and funding agencies.

The 2016 terahertz science and technology roadmap

https://www.repository.cam.ac.uk/bitstream/1810/264501/1/Fu_et_al-2017-Progress_in_Material_Science-VoR.pdf

Advances in piezoelectric thin films for acoustic biosensors, acoustofluidics and lab-on-chip applications

The optimization field suffers from the metaphor-based “pseudo-novel” or “fancy” optimizers. Most of these cliche methods mimic animals' searching trends and possess a small contribution to the optimization process itself. Most of these cliche methods suffer from the locally efficient performance, biased verification methods on easy problems, and high similarity between their components' interactions. This study attempts to go beyond the traps of metaphors and introduce a novel metaphor-free population-based optimization method based on the mathematical foundations and ideas of the Runge Kutta (RK) method widely well-known in mathematics. The proposed RUNge Kutta optimizer (RUN) was developed to deal with various types of optimization problems in the future. The RUN utilizes the logic of slope variations computed by the RK method as a promising and logical searching mechanism for global optimization. This search mechanism benefits from two active exploration and exploitation phases for exploring the promising regions in the feature space and constructive movement toward the global best solution. Furthermore, an enhanced solution quality (ESQ) mechanism is employed to avoid the local optimal solutions and increase convergence speed. The RUN algorithm's efficiency was evaluated by comparing with other metaheuristic algorithms in 50 mathematical test functions and four real-world engineering problems. The RUN provided very promising and competitive results, showing superior exploration and exploitation tendencies, fast convergence rate, and local optima avoidance. In optimizing the constrained engineering problems, the metaphor-free RUN demonstrated its suitable performance as well. The authors invite the community for extensive evaluations of this deep-rooted optimizer as a promising tool for real-world optimization. The source codes, supplementary materials, and guidance for the developed method will be publicly available at different hubs at http://imanahmadianfar.com and http://aliasgharheidari.com/RUN.html .

RUN beyond the metaphor: An efficient optimization algorithm based on Runge Kutta method

A wireless link working at 220-GHz band is proposed for point-to-point high-speed communication. The system is primarily composed of sub-terahertz transceivers and baseband data processing platforms. Subharmonic mixers based on Schottky diode are developed and measured with a double-sideband (DSB) noise temperature of lower than 1100 K from 205 GHz to 230 GHz. High-selectivity waveguide bandpass filters are designed to reject the image sideband noise from entering the receiver. Two 58-dBi Cassegrain antennas are used to compensate for the large energy losses contributed by free space path and atmospheric absorption. Besides, sub-THz amplifiers based on InP HEMT technology are developed to further increase the transmitting power. To improve spectrum efficiency, 16 quadrature amplitude modulation is adopted. Forward error correction is implemented by using Reed-Solomon codes to reinforce the reliability of signal transmission. An outdoor wireless link is finally established within 1.5 km, and a data rate of 10 Gbps is achieved in real-time mode with an EVM of 9.53% (BER 1.4 × 10 - 9 ). For demonstration, uncompressed ultra-HD videos are successfully transmitted. Note that any auxiliary electronic testing and measurement equipment is not required while communicating. It is believed that this article provides an effective and practical solution for future long-distance high-speed communication.

10-Gbps real-time wireless link over 1.5 km at 220-GHz band based on Schottky-diode transceiver and 16-QAM modulation

In this paper, the influence of the silver glue on circuit performance and the reasons for its formation are analyzed in a terahertz hybrid integrated mixer. A validation analysis was carried out in the 600 - 700 GHz band with the aid of simulation software. Then a terahertz hybrid integrated mixing circuit with large pads was proposed in order to reduce the influence of the silver glue. Through the comparison of simulation results, it can be seen that after using large pads, the silver glue used for connection mainly concentrated on pads, which cannot have a significant impact on the matching of the circuits. The use of large pads also to a certain extent eliminates the resonance effect caused by silver glue. A terahertz hybrid integrated mixer with large pads was processed, assembled and tested. The test results show that the conversion loss is less than 14 dB under an RF frequency of 600 - 667 GHz. The experiments prove good consistency between measured and predicted conversion loss of the mixer using large pads. The difference between the measured and predicted conversion loss is only within 1.8 dB.

/pdf/analysis-of-welding-pad-for-terahertz-hybrid-integrated-5bvx9mlzud.pdf

Analysis of Welding Pad for Terahertz Hybrid Integrated Mixer

The utility model discloses an utilize low pass filter of split ring belongs to wave filter field, especially utilize low pass filter of split ring. The utility model discloses an air chamber, set up medium base plate in the air chamber, set up the microstrip line on the medium base plate, the microstrip line includes: input section, interlude, deferent segment, each section microstrip line all is symmetrical structure, and wherein the input section includes: input feed microstrip line, with first " concave " shape detail that input feed microstrip line is connected, be somebody's turn to do " concave " and appear detail opening direction and be the deferent segment direction, the deferent segment microstrip line includes: output feed microstrip line, with second " concave " the shape detail that output feed microstrip line is connected, be somebody's turn to do " concave " and appear detail opening direction and be the input section direction, the interlude includes: connect two sets of " T " shape detail that sets up on the horizontal detail, this horizontal detail of input section and deferent segment, every group is including two " the T " who uses this horizontal detail as the symmetry axis detail that appears. The problem of among the prior art complicated, the processing difficulty of low pass filter structure, size bigger than normal is solved.

Utilize low pass filter of split ring

An investigation on the electrical and hydrogen sensing properties of a Schottky diode based on a Pd/lanthanum-tungsten oxide/SiC structure is presented. Various amounts of lanthanum are doped into WO3 on SiC substrate by using different RF sputtering powers. The oxide surface morphology is observed by AFM. The current-voltage characteristics and hydrogen sensing performance including change in barrier height and sensitivity are examined from 100 °C to 250 °C. At 150 °C, the La-doped WO3-based sensor has a maximum sensitivity of 25 upon exposure to 10,000 ppm hydrogen in air atmosphere. The results indicate that the presence of lanthanum substantially improves the hydrogen sensitivity of the WO3 Schottky diode.

Improved hydrogen-sensing performance of Pd/WO 3 /SiC Schottky diode by La doping

A low-noise amplifier (LNA) for 3–10 GHz ultrawideband applications is realized in 65-nm CMOS technology. A self-biased resistive feedback structure with inductive peaking topology is used to achieve wideband matching as well as flat gain, and the current reuse technique is used to reduce power consumption. Furthermore, a series source negative feedback resistor is introduced to achieve a significant input matching improvement for the purpose of saving chip area. The LNA exhibits 13.2-dB power gain, 4.38-dB minimum noise figure, and 6.54-mW power consumption under a 1.2-V supply voltage. Moreover, only two inductors are used in the circuit, occupying a silicon area of 0.072 mm2. It is able to achieve functionality with a small silicon area and a low-power consumption among recently published CMOS-based wideband LNAs. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:293–295, 2016

Yang Liu

Papers

10-Gbps real-time wireless link over 1.5 km at 220-GHz band based on Schottky-diode transceiver and 16-QAM modulation

Analysis of Welding Pad for Terahertz Hybrid Integrated Mixer

Utilize low pass filter of split ring

Improved hydrogen-sensing performance of Pd/WO 3 /SiC Schottky diode by La doping

3–10 GHz, 6.54‐mW CMOS ultrawideband low‐noise amplifier using a hybrid structure