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IEEE International Conference on Power Electronics, Drives and Energy Systems

作者： Thota venkata Pruthvi Merugu Kavitha Phaneendra Babu Bobba D Mohan Reddy Dept. of Electrical Engineering Shiv Nadar University Gautam Buddha Nagar U.P. India Dept. of Electrical Engineering GRIET Hyderabad Telangana India Dept. of Electrical Engineering JNTUA Kadapa A.P. India

ISBN: (纸本)9781538693179;9781538693162

Advancement in the vLSI industry has brought out the drastic demand for numerous electronic devices such as mobiles, notepads, and computers etc. Its long charging cables create an inconvenience for the users. To replace such cables, an elegant wireless charging technique has been introduced to the current electronic industry. In this paper, a universal wireless charging system (UWCS) is designed, in which two segmented coils are connected series in fashion by means of electronic switches. The UWCS, on the whole, is suitable for laptop application and a small part of its design is used for the mobile application. As per the load requirement, the switching conditions of UWCS gets automatically changes. In UWCS, misalignment is the recurrently occurring dispute which diminishes the coupling factor between transmitter and receiver pads. In such systems, selection of proper coil structure is the preliminary significant part of its design. In this paper, several coil structures are chosen and simulated under various misalignment cases. The misalignment's effect and the shape of coil structure on various parameters of the wireless charging system are detailed in the paper. In addition, the variation of magnetic fields between transmitter and receiver pads for distinct misalignment cases are observed and analyzed in this paper. Thus, this paper provides the better coil-structure for a feasible UWC system for mobile and laptop applications.

关键词： Coils Inductive charging Portable computers Couplings optical wavelength conversion Receivers Transmitters

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A 0.13-μm CMOS SoC for Simultaneous Multichannel Optogenetics and Neural Recording

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IEEE JOURNAL OF SOLID-STATE CIRCUITS 2018年第11期53卷 3087-3100页

作者： Gagnon-Turcotte, Gabriel Khiarak, Mehdi Noormohammadi Ethier, Christian De Koninck, Yves Gosselin, Benoit Laval Univ Dept Elect & Comp Engn Quebec City PQ G1V 0A6 Canada CERVO Brain Res Ctr Quebec City PQ G1J 2G3 Canada

This paper presents a 0.13-mu m CMOS system-on-chip (SoC) for simultaneous multichannel optogenetics and multichannel neural recording in freely moving laboratory animals. This fully integrated system provides 10 multimodal recording channels with analog-to-digital conversion and a four-channel LED driver circuit for optogenetic stimulation. The bio-amplifier design includes a programmable bandwidth (BW) (0.5 Hz-7 kHz) to collect either the action potentials (APs) and/or the local field potentials (LFPs) and has a noise efficiency factor (NEF) of 2.30 for an input-referred noise of 3.2 mu v-rms within a BW of 10-7 kHz. The low-power delta-sigma (Delta Sigma) MASH 1-1-1 analog-to-digital converter (ADC) is designed to work at low oversampling ratios (OSRs) (<= 50) and has an effective number of bits (ENOB) of 9.75 bits at an OSR of 25 (BW of 10 kHz). The utilization of a Delta Sigma ADC is the key to address the flexibility needed to address different noise versus power consumption tradeoff of various experimental settings. It leverages a new technique that reduces its size by subtracting the output of each Delta Sigma branch in the digital domain, instead of in the analog domain as done conventionally. The ADC is followed by an on-chip fourth-order cascaded integrator-comb (CIC4) decimation filter (DF). A whole recording channel, including the bio-amplifier, the Delta Sigma MASH 1-1-1, and the DF consumes 11.2 mu W. optical stimulation is performed with an LED driver using a regulated cascode current source with feedback that can accommodate a wide range of LED parameters and battery voltages. The SoC is validated in vivo within a wireless experimental platform in both the ventral posteromedial nucleus (vPM) and cerebral motor cortex brain regions of a virally mediated Channelrhodopsin-2 (ChR2) rat.

关键词： Decimation electrophysiology low-power MASH delta-sigma (Delta Sigma) multimodal optical stimulator optogenetics

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Ground improvement engineering-issues and selection

Ground improvement engineering-issues and selection

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ISRM International Symposium 2000, IS 2000

作者： Munfakh, George A. Wyllie, Duncan C. Parsons Brinckerhoff Quade and Douglas Inc One Penn Plaza New YorkNY10119 United States Wyllie and Norrish Rock Engineering Ltd. Suite 200 Viva Tower 1311 Howe Street VancouverBCV6Z2P3 Canada

The issues, which affect the successful application of ground improvement in soil and rock, are studied with emphasis on the design, construction and long-term performance of the improved ground. Discussed are over thirty technical issues affecting twenty four ground improvement techniques representing the eight main categories of ground improvement in soil: densification, consolidation, weight reduction, reinforcement, chemical treatment, thermal stabilization, electrotreatment and biotechnical stabilization. The issues, which influence rock integrity, are also discussed, including those related to rock properties as well as external factors such as water, climate, earthquakes and others. Eight types of rock degradation are described in the paper and possible remediation measures are identified for each, many of which include the application of ground improvement. Several factors, which may influence the selection of a ground improvement technique or a combination of techniques, are discussed and a case study is presented to demonstrate the selection process. © 2018 ISRM International Symposium 2000, IS 2000. All rights reserved.

关键词： Rocks

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高功率密度微焦斑X射线源聚焦系统的设计

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电子显微学报 2019年第2期38卷 112-117页

作者：王丽娟刘俊标赵伟霞李文萍韩立中国科学院电工研究所北京100190 中国科学院大学北京100049 北京航空航天大学北京100083

X射线源是X射线显微成像系统的核心部件,其功率密度和焦斑大小与聚焦系统密切相关。本文对高功率密度微焦斑X射线源的聚焦系统进行了优化设计,包括透镜结构设计、多透镜工作模式的选择、透镜间距优化等。本文设计了小球差系数的物镜;提... 详细信息

X射线源是X射线显微成像系统的核心部件,其功率密度和焦斑大小与聚焦系统密切相关。本文对高功率密度微焦斑X射线源的聚焦系统进行了优化设计,包括透镜结构设计、多透镜工作模式的选择、透镜间距优化等。本文设计了小球差系数的物镜;提出了由聚光镜、辅助聚光镜和物镜组成的多透镜聚焦系统,以实现系统较大的缩放比率和束流较高的传递效率;优化了透镜间距,以保证在满足系统缩放比率的前提下减小聚光镜的安匝数。最后,运用MEBS公司专业电子束计算软件,计算仿真了160 k v的加速电压下聚焦系统中透镜的场分布、电子的运动轨迹、像差、束斑分布等电子光学参量,最终得到束流为80μA,束斑为0. 9μm,功率密度优于1 W/μm^2的微束斑电子束。本文设计的聚焦系统为高功率密度微焦斑X射线源的设计和研制提供了依据。

关键词：高功率密度电子光学聚焦系统磁透镜电子束

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The design of highly efficient polymer solar cells with outstanding short-circuit current density based on small band gap electron acceptor

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Dyes and Pigments 2018年 150卷 363-369页

作者： Danyang Ma Shiyu Feng Zhe Zhang Cuihong Li Shouke Yan Zhishan Bo State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry Key Laboratory of Theoretical and Computational Photochemistry Ministry of Education Beijing Normal University Beijing 100875 China

To extend the absorption and enhance the electron mobility of fused-ring electron acceptors (FREAs), we designed and synthesized new FREAs ( TTIC and TTIC-M ) based on 4,9-dihydrothieno[3′,2':4,5]cyclopenta[1,2- b ]thieno[2″,3'':3′,4'] cyclopenta[1′,2':4,5]thieno[2,3- d ]thiophene ( DTCTT ) and 1,1-dicyanomethylene-3-indanone (IC). DTCTT unit possesses strong electron donating ability, which can broaden the absorption of the resulting acceptor molecule by enhanced internal charge transfer (ICT) effect. The S atoms on the fused ring structure can enhance the electron transport by intermolecular noncovalent S-S interaction. Furthermore, the introduction of a methyl group at the terminal IC unit can elevate the LUMO energy level of FREAs and afford higher open circuit voltage ( v oc ). As expected, TTIC and TTIC-M showed a broad absorption with the edge extending to the near-infrared (NIR) region (900 nm) and the optical band gaps of TTIC and TTIC-M is 1.40 and 1.44 ev, respectively. Devices based on PBDB-T : TTIC gave a PCE of 10.61% with an outstanding Jsc of 22.26 mA cm −2 , a v oc of 0.77 v and an FF of 0.62. More noticeably, devices based on PBDB-T : TTIC-M provided a higher v oc of 0.80 v and a PCE of 11.48% with a J sc of 20.51 mA cm −2 and an FF of 0.70. 11.48% is the best performance for polymer solar cells based on small band gap nonfullerene acceptors (<1.45 ev) up to now.

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Transparent and Flexible Oxide Nano-Electronics

Transparent and Flexible Oxide Nano-Electronics

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International Flexible Electronics Technology Conference (IFETC)

作者： Arokia Nathan Chen Jiang Xiang Cheng Guangyu Yao Hanbin Ma Hyung Woo Choi Department of Engineering University of Cambridge Cambridge UK

ISBN: (纸本)9781538633588

Oxide semiconductors are becoming a key material for future electronics because of their wide band gap, hence high transparency and low OFF current, compared with the ubiquitous silicon technologies. Besides oxides, for flexible electronics applications, organic semiconductors are gaining considerable interest due to their low-cost printing processes and mechanical flexibility. This talk will review the integration of oxides and fully printable organics for large area, including newly emerging application areas related to the Internet of Things. We will discuss the critical design considerations to show how device-circuit interactions should be handled and how compensation methods can be implemented for stable and reliable operation. In particular, the quest for low power becomes highly compelling in wearable devices. We will discuss thin-film transistor operation in the different regimes, and review device properties when operated in the deep subthreshold regime or in near-OFF state, addressing the pivotal requirement of low supply voltage and ultralow power leading to potentially battery-less *** order to minimize power consumption in oxide TFTs, the devices are operated in the deep subthreshold regime, i.e., near the OFF state, to reduce drain current that contribute to power consumption [1]. For organic TFTs, in particular, all-inkjet-printed devices, we will show that the operating voltage can also be lowered by reducing the semiconductor/dielectric interface trap density, and thus, power consumption can be further reduced [2]. The all-inkjet-printed devices exhibit a low operating voltage of 1 v, a nearly zero threshold voltage (v th ) of 0.01 v, a steep subthreshold slope of 0.069 v/decade, a high on/off ratio of 10 7 , and negligible hysteresis. By investigating the polarity of the two dielectrics, we found that a Lewis-acid monopolar dielectric could exhibit lipophilicity and hydrophobicity at the same time, which ensures printability and avoids wa

关键词： Thin film transistors Dielectrics optical fiber amplifiers optical fiber devices Flexible electronics Threshold voltage Power demand

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Mauna Kea Spectroscopic Explorer (MSE): A preliminary design of multi-object high resolution spectrograph

arXiv

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arXiv 2018年

作者： Zhang, Kai Zhou, Yifei Tang, Zhen Saunders, Will venn, Kim A. Shi, Jianrong McConnachie, Alan W. Szeto, Kei Wang, Lei Zhu, Yongtian Hu, Zhongwen National Astronomical Observatories Nanjing Institute of Astronomical Optics & Technology Chinese Academy of Sciences Nanjing210042 China Key Laboratory of Astronomical Optics & Technology Nanjing Institute of Astronomical Optics & Technology Chinese Academy of Sciences Nanjing210042 China University of Chinese Academy of Sciences Beijing100049 China Australian Astronomical Observatory North RydeNSW2113 Australia University of Victoria VictoriaBCV8P 5C2 Canada National Astronomical Observatory of China Chinese Academy of Sciences Beijing100012 China CFHT Corporation KamuelaHI96743 United States National Research Council of Canada VictoriaBCV9E 2E7 Canada

The Maunakea Spectroscopic Explorer (MSE) project will transform the CFHT 3.6m optical telescope to a 10m class dedicated multi-object spectroscopic facility, with an ability to measure thousands of objects with three spectral resolution modes respectively low resolution of R≈3,000, moderate resolution of R≈6,000 and high resolution of R≈ 40,000. Two identical multi-object high resolution spectrographs are expected to simultaneously produce 1084 spectra with high resolution of 40,000 at Blue (401-416nm) and Green (472-489nm) channels, and 20,000 at Red (626-674nm) channel. At the Conceptual design Phase (CoDP), different optical schemes were proposed to meet the challenging requirements, especially a unique design with a novel transmission image slicer array, and another conventional design with oversize volume Phase Holographic (vPH) gratings. It became clear during the CoDP that both designs presented problems of complexity or feasibility of manufacture, especially high line density disperser (general name for all kinds of grating, grism, prism). At the present, a new design scheme is proposed for investigating the optimal way to reduce technical risk and get more reliable estimation of cost and timescale. It contains new dispersers, F/2 fast collimator and so on. Therein, the disperser takes advantage of a special grism and a prism to reduce line density on grating surface, keep wide opening angle of optical path, and get the similar spectrum layout in all three spectral channels. For the fast collimator, it carefully compares on-axis and off-axis designs in throughput, interface to fiber assembly and technical risks. The current progress is more competitive and credible than the previous design, but it also indicates more challenging work will be done to improve its accessibility in engineering. Copyright © 2018, The Authors. All rights reserved.

关键词： Spectral resolution

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Wannier90 as a community code: New features and applications

arXiv

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arXiv 2019年

作者： Pizzi, Giovanni vitale, valerio Arita, Ryotaro Blugel, Stefan Freimuth, Frank Geranton, Guillaume Gibertini, Marco Gresch, Dominik Johnson, Charles Koretsune, Takashi Ibanez-Azpiroz, Julen Lee, Hyungjun Lihm, Jae-Mo Marchand, Daniel Marrazzo, Antimo Mokrousov, Yuriy Mustafa, Jamal I. Nohara, Yoshiro Nomura, Yusuke Paulatto, Lorenzo Ponce, Samuel Ponweiser, Thomas Qiao, Junfeng Thole, Florian Tsirkin, Stepan S. Wierzbowska, Malgorzata Marzari, Nicola vanderbilt, David Souza, Ivo Mosto, Arash A. Yates, Jonathan R. Theory and Simulation of Materials National Centre for Computational Design and Discovery of Novel Materials Ecole Polytechnique Federale de Lausanne LausanneCH-1015 Cavendish Laboratory Department of Physics University of Cambridge CambridgeCB30HE Departments of Materials and Physics Thomas Young Centre for Theory and Simulation of Materials Imperial College London LondonSW72AZ RIKEN Center for Emergent Matter Science 2-1 Hirosawa Wako Saitama351-0198 Department of Applied Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Peter Grunberg Institut Institute for Advanced Simulation JARA Julich52425 Department of Quantum Matter Physics University of Geneva Geneva ETH Zurich Zurich Departments of Materials and Physics Imperial College London LondonSW72AZ Department of Physics Tohoku University Sendai JST PRESTO Kawaguchi Saitama Centro de Fisica de Materiales Universidad Del Pais Vasco San SebastianE-20018 Institute of Physics Ecole Polytechnique Federale de Lausanne LausanneCH-1015 Korea Institute for Advanced Study Hoegiro 85 Seoul02455 Department of Physics Center for Theoretical Physics Seoul National University Seoul08826 Laboratory for Multiscale Mechanics Modeling Ecole Polytechnique Federale de Lausanne Lausanne Institute of Physics Jonannes-Gutenberg University of Mainz Mainz55099 Department of Physics University of California BerkeleyCA94720 United States ASMS Co. Ltd. 1-7-11 Higashi-Gotanda Shinagawa-ku Tokyo141-0022 Institut de Mineralogie de Physique des Materiaux et de Cosmochimie Sorbonne Universite CNRS Case 115 4 place Jussieu Paris Cedex75252 Department of Materials University of Oxford Parks Road OxfordOX13PH Research Institute for Symbolic Computation Johannes Kepler University Altenberger Strae 69 Linz4040 Fert Beijing Institute School of Microelectronics BDBC Beihang University Beijing Materials Theory ETH Zurich Wolfgang-Pauli-Strasse 27 ZurichCH-8093 Department of Physics University of Zurich

Wannier90 is an open-source computer program for calculating maximally-localised Wannier functions (MLWFs) from a set of Bloch states. It is interfaced to many widely used electronicstructure codes thanks to its independence from the basis sets representing these Bloch states. In the past few years the development of Wannier90 has transitioned to a community-driven model;this has resulted in a number of new developments that have been recently released in Wannier90 v3.0. In this article we describe these new functionalities, that include the implementation of new features for wannierisation and disentanglement (symmetry-adapted Wannier functions, selectivelylocalised Wannier functions, selected columns of the density matrix) and the ability to calculate new properties (shift currents and Berry-curvature dipole, and a new interface to many-body perturbation theory);performance improvements, including parallelisation of the core code;enhancements in functionality (support for spinor-valued Wannier functions, more accurate methods to interpolate quantities in the Brillouin zone);improved usability (improved plotting routines, integration with high-throughput automation frameworks), as well as the implementation of modern software engineering practices (unit testing, continuous integration, and automatic source-code documentation). These new features, capabilities, and code development model aim to further sustain and expand the community uptake and range of applicability, that nowadays spans complex and accurate dielectric, electronic, magnetic, optical, topological and transport properties of materials. Copyright © 2019, The Authors. All rights reserved.

关键词： Open source software

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Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

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EUv and X-Ray Optics: Synergy between Laboratory and Space v

ISBN: (纸本)9781510609716

The proceedings contain 21 papers. The topics discussed include: current developments and tests of small x-ray optical systems for space applications;application of biomimetics in x-ray optics;optimization of microroughness of replicated x-ray optics;joint observations of solar corona in space projects ARKA and KORTES;reflective optics for effective collection of x-ray and EUv radiation: use for creation of photoionized plasmas and detection of weak signals;study of Pd/Y based multilayers using high energy photoemission spectroscopy combined with x-ray standing waves;development of depth-graded W/Si multilayer mirrors for x-ray focusing telescope application;diffraction losses in monocrystalline x-ray refractive lenses;polarizers tuned at key far-Uv spectral lines for space instrumentation;effect of ion beam etching on the surface roughness of bare and silicon covered beryllium;uncooled spectrometer for x-ray astrophysics;development and demonstration of a water-window soft x-ray microscope using a Z-pinching capillary discharge source;high-aperture monochromator-reflectometer and its usefulness for CCD calibration;and a table top polarimetric facility for the EUv spectral range: implementations and characterization.

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developments and optimizations in the pre-salt risers systems: From initial technical challenges up to future expectations

Developments and optimizations in the pre-salt risers system...

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OTC Brasil 2017

作者： Caldeira De Oliveira, R. Gasparetto, v. Oazen, E.v. Senra, S.F. Aguiar, L.L. valença, C.J. Lima, D.L. Carrara, W. Lemos, C.A.D. PETROBRAS S.A. Brazil

ISBN: (纸本)9781510852556

This paper aims to describe developments in the Santos Basin Pre-Salt risers systems, which in some few years experienced many different concepts to overcome big challenges. This paper also describes initiatives to optimize configurations with evolution and maturity of riser technologies and expectations for future developments. In Santos basin Pre-Salt cluster, due to the challenging environmental conditions, presence of H2S and CO2, water depth up to 2310m, production riser's insulation requirements, relatively high temperature and high pressure, the riser system design for this scenario was something innovative and challenging for the industry. currently, due to lower oil prices, an even more complex scenario is in evidence, imposing even greater challenges for risers systems regarding cost reduction. The experience acquired with the implementation of the first projects was a key factor to find viable and comprehensive ways to optimize cost. In approximately 7 years of production in the Santos basin Pre-Salt layer, oil production surpassed 1 million bpd by using several different riser concepts: BSRs (Buoy-Supported Risers), SLWRs (Steel Lazy Wave Risers), Flexible Lazy Wave Risers, Free Hanging Flexible Risers and FSHRs (Free Standing Hybrid Risers). Nowadays, with greater maturity and new design premises, considerable cost reduction results have been obtained, mainly motivated by the reduction of buoyancy modules and reduction of riser sections quantity in the flexible risers. For the future, there are other ongoing optimizations studies to apply both flexible and rigid risers in free hanging configuration. In early stages of project development, an extensive engineering work on riser analysis, the establishment of new design premise and some changes on current design process were done through a joint effort by operator, partners and suppliers. These are key factors for the achievement of considerable cost reduction. The maturity reached with the riser system d

关键词： Cost reduction

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