检索结果-内蒙古大学图书馆

22nd International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2018

作者： Didier, Charles Kundu, Avra Rajaraman, Swaminathan University of Central Florida OrlandoFL32828 United States Department of Materials Science and Engineering University of Central Florida OrlandoFL32828 United States Department of Electrical and Computer Engineering University of Central Florida OrlandoFL32828 United States

ISBN: (纸本)9781510897571

We present a novel method for the integration of 3D printed, dynamic, stretchable, packaged structures to realize 4D multifunctional biosensors for lab-on-a-chip and wearable sensor applications. The device incorporates 3D printed serpentine designs, with various out-of-plane structures, integrated on to a flexible Kapton® package with micromolded PDMS insulation. The flexibility of the printed design can be tuned by different resins, and structural design changes. Integration of 3D structures, LEDs, and helices followed by bending/twisting analysis depict the capability of the device to return naturally to its resting state (and hence 4D functionality). 3D microelectrode impedance measurements are additionally demonstrated. Copyright © (2018) by Chemical and Biological Microsystems Society. All rights reserved.

关键词： 3D printers

Ultrastrong magnon-magnon coupling dominated by antiresonant interactions

学校读者我要写书评

暂无评论

arXiv 2020年

作者： Makihara, Takuma Hayashida, Kenji Noe, G. Timothy Li, Xinwei Peraca, Nicolas Marquez Ma, Xiaoxuan Jin, Zuanming Ren, Wei Ma, Guohong Katayama, Ikufumi Takeda, Jun Nojiri, Hiroyuki Turchinovich, Dmitry Cao, Shixun Bamba, Motoaki Kono, Junichiro Department of Physics and Astronomy Rice University HoustonTX United States Department of Electrical and Computer Engineering Rice University HoustonTX United States Division of Applied Physics Graduate School Faculty of Engineering Hokkaido University Sapporo Hokkaido060-8628 Japan Department of Physics International Center of Quantum and Molecular Structures and Materials Genome Institute Shanghai University Shanghai200444 China Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation Center Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology 516 JunGong Road Shanghai200093 China Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama Japan Institute for Materials Research Tohoku University Sendai Japan Fakultät für Physik Universität Bielefeld Universitätsstr. 25 Bielefeld33615 Germany Department of Physics Kyoto University Sakyo-ku Kyoto606-8502 Japan PRESTO Japan Science and Technology Agency Saitama332-0012 Japan Department of Materials Science and NanoEngineering Rice University HoustonTX United States

Exotic quantum vacuum phenomena are predicted in cavity quantum electrodynamics (QED) systems with ultrastrong light-matter interactions. Their ground states are predicted to be vacuum squeezed states with suppressed quantum fluctuations. The source of such phenomena is antiresonant terms in the Hamiltonian, yet antiresonant interactions are typically negligible compared to resonant interactions in light-matter systems. We report an unusual, ultrastrongly coupled matter-matter system of magnons that is analytically described by a unique Hamiltonian in which the relative importance of resonant and antiresonant interactions can be easily tuned and the latter can be made vastly dominant. We found a novel regime where vacuum Bloch-Siegert shifts, the hallmark of antiresonant interactions, greatly exceed analogous frequency shifts from resonant interactions. Further, we theoretically explored the system's ground state and calculated up to 5.9 dB of quantum fluctuation suppression. These observations demonstrate that magnonic systems provide an ideal platform for exploring exotic quantum vacuum phenomena predicted in ultrastrongly coupled light-matter systems. Copyright © 2020, The Authors. All rights reserved.

关键词： Hamiltonians

Development of Efficient electrically Pumped Nanolasers based on InAlGaAs Tunnel Junction

学校读者我要写书评

暂无评论

Development of Efficient Electrically Pumped Nanolasers base...

2018 Conference on Lasers and Electro-Optics, CLEO 2018

作者： Fang, Cheng-Yi Vallini, Felipe Amili, Abdelkrim El Tukiainen, Antti Lyytikainen, Jari Guina, Mircea Fainman, Yeshaiahu Materials Science and Engineering Program at University of California at San Diego San DiegoCA92093-0418 United States Department of Electrical Computer Engineering University of California San Diego San DiegoCA92037 United States Optoelectronic Research Centre Tampere University of Technology Tampere33101 Finland

We propose and experimentally demonstrate a metallo-dielectric nanolasers utilizing an InAlGaAs tunnel junction for efficient carrier injection, which reduce the complexity when optimizing the metal contact, and reduc... 详细信息

ISBN: (纸本)9781943580422

关键词： Junctions Metals Resistance Optical pumping Indium phosphide III-V semiconductor materials Temperature measurement"

Soft Electronics: Soft Electronics for the Skin: From Health Monitors to Human–Machine Interfaces (Adv. Mater. Technol. 9/2020)

学校读者我要写书评

暂无评论

Advanced materials Technologies 2020年第9期5卷

作者： Zhoulyu Rao Faheem Ershad Abdullah Almasri Lei Gonzalez Xiaoyang Wu Cunjiang Yu Materials Science and Engineering Program University of Houston Houston TX 77204 USA Department of Biomedical Engineering University of Houston Houston TX 77204 USA Ben May Department for Cancer Research The University of Chicago Chicago IL 60637 USA Department of Mechanical Engineering Department of Electrical and Computer Engineering Texas Center for Superconductivity University of Houston Houston TX 77204 USA

Coexistence of magnetic orders in two-dimensional magnet CrI3

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Niu, Ben Su, Tang Francisco, Brian A. Ghosh, Subhajit Kargar, Fariborz Huang, Xiong Lohmann, Mark Li, Junxue Xu, Yadong Taniguchi, Takashi Watanabe, Kenji Wu, Di Balandin, Alexander Shi, Jing Cui, Yong-Tao National Laboratory of Solid State Microstructures Department of Materials Science and Engineering Jiangsu Key Laboratory for Artificial Functional Materials Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Department of Physics and Astronomy University of California RiversideCA92521 United States International Center for Quantum Materials School of Physics Peking University Beijing100871 China Department of Electrical and Computer Engineering University of California RiversideCA92521 United States Department of Materials Science and Engineering University of California RiversideCA92521 United States National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan

The magnetic properties in two-dimensional van der Waals materials depend sensitively on structure. CrI3, as an example, has been recently demonstrated to exhibit distinct magnetic properties depending on the layer thickness and stacking order. Bulk CrI3 is ferromagnetic (FM) with a Curie temperature of 61 K and a rhombohedral layer stacking, while few-layer CrI3 has a layered antiferromagnetic (AFM) phase with a lower ordering temperature of 45 K and a monoclinic stacking. In this work, we use cryogenic magnetic force microscopy to investigate CrI3 flakes in the intermediate thickness range (25 – 200 nm) and find that the two types of magnetic orders hence the stacking orders can coexist in the same flake, with a layer of ~13 nm at each surface being in the layered AFM phase similar to few-layer CrI3 and the rest in the bulk FM phase. The switching of the bulk moment proceeds through a remnant state with nearly compensated magnetic moment along the c-axis, indicating formation of c-axis domains allowed by a weak interlayer coupling strength in the rhombohedral phase. Our results provide a comprehensive picture on the magnetism in CrI3 and point to the possibility of engineering magnetic heterostructures within the same material. Copyright © 2019, The Authors. All rights reserved.

关键词： Magnets

Development of a smartphone-based app for determination of formaldehyde concentration indoors 15

学校读者我要写书评

暂无评论

Development of a smartphone-based app for determination of f...

15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018

作者： Zhang, Siyang Shapiro, Nicholas Gehrke, Gretchen Castner, Jessica Liu, Zhenlei Guo, Beverly Zhang, Jianshun Haines, Sarah Kormos, David Frey, Paige Qin, Rongjun Dannemiller, Karen C. Department of Computer Science and Engineering Ohio State University United States Public Laboratory for Open Technology and Science Department of Mechanical and Aerospace Engineering Syracuse University Environmental Science Graduate Program Ohio State University United States Department of Civil Environmental and Geodetic Engineering College of Engineering Ohio State University United States Strand Associates Incorporated Department of Electrical and Computer Engineering Ohio State University United States Department of Environmental Health Sciences College of Public Health Ohio State University United States

ISBN: (纸本)9781713826514

Formaldehyde is a ubiquitous contaminant in the indoor environment that is both a carcinogen and irritant. The goal of this project is to develop a smartphone-based app for use by citizen scientists or researchers that can be paired with low-cost colorimetric badges for detection of indoor formaldehyde. We conducted both national and geographically-targeted surveys prior to app design. We have subsequently developed the app and conducted a beta test. Surveys of 147 individuals indicated broad public interest in formaldehyde testing using smartphone technology. Testing of the badges indicated consistent change in illumination with increasing formaldehyde exposure. Beta testing indicated users were able to navigate the existing app, and highlighted areas for improvement including incorporation of public surveys. Planned future analysis includes extensive calibration testing and a community-based field test. © 2018 15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018. All rights reserved.

关键词： Formaldehyde

Hole mobility of strained GaN from first principles

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Poncé, Samuel Jena, Debdeep Giustino, Feliciano Department of Materials University of Oxford Parks Road OxfordOX1 3PH United Kingdom School of Electrical and Computer Engineering Cornell University IthacaNY14853 United States Department of Material Science and Engineering Cornell University IthacaNY14853 United States

Nitride semiconductors are ubiquitous in optoelectronic devices such as LEDs and Blu-Ray optical disks. A major limitation for further adoption of GaN in power electronics is its low hole mobility. In order to address this challenge, here we investigate the phonon-limited mobility of wurtzite GaN using the ab initio Boltzmann transport formalism, including all electron-phonon scattering processes, spin-orbit coupling, and many-body quasiparticle band structures. We demonstrate that the mobility is dominated by acoustic deformation-potential scattering, and we predict that the hole mobility can significantly be increased by lifting the split-off hole states above the light and heavy holes. This can be achieved by reversing the sign of the crystal-field splitting via strain or via coherent excitation the A1 optical phonon through ultrafast infrared optical pulses. Copyright © 2019, The Authors. All rights reserved.

关键词： Gallium nitride

Refractory doped titanium nitride nanoscale field emitters

学校读者我要写书评

暂无评论

arXiv 2020年

作者： Nardi, Alberto Turchetti, Marco Britton, Wesley A. Chen, Yuyao Yang, Yujia Negro, Luca Dal Berggren, Karl K. Keathley, Phillip D. Research Laboratory of Electronics Massachusetts Institute of Technology 50 Vassar Street CambridgeMA02139 United States Department of Electronics and Telecommunications Politecnico di Torino Corso Duca degli Abruzzi 24 Torino10129 Italy Division of Materials Science & Engineering Boston University 15 Saint Mary’s Street BrooklineMA02446 United States Department of Electrical & Computer Engineering and Photonics Center Boston University 8 Saint Mary’s Street BostonMA02215 United States Department of Physics Boston University 590 Commonwealth Avenue BostonMA02215 United States

Refractory materials exhibit high damage tolerance, which is attractive for the creation of nanoscale field-emission electronics and optoelectronics applications that require operation at high peak current densities and optical intensities. Recent results have demonstrated that the optical properties of titanium nitride, a refractory and CMOS-compatible plasmonic material, can be tuned by adding silicon and oxygen dopants. However, to fully leverage the potential of titanium (silicon oxy)nitride, a reliable and scalable fabrication process with few-nm precision is needed. In this work, we developed a fabrication process for producing engineered nanostructures with gaps between 10 and 15 nm, aspect ratios larger than 5 with almost 90° steep sidewalls. Using this process, we fabricated large-scale arrays of electrically-connected bow-tie nanoantennas with few-nm free-space gaps. We measured a typical variation of 4 nm in the average gap size. Using applied DC voltages and optical illumination, we tested the electronic and optoelectronic response of the devices, demonstrating sub-10-V tunneling operation across the free-space gaps, and quantum efficiency of up to 1 × 10−3 at 1.2 µm, which is comparable to a bulk silicon photodiode at the same wavelength. Tests demonstrated that the titanium silicon oxynitride nanostructures did not significantly degrade, exhibiting less than 5 nm of shrinking of the average gap dimensions over few-µm2 areas after roughly 6 hours of operation. Our results will be useful for developing the next generation of robust and CMOS-compatible nanoscale devices for high-speed and low-power field-emission electronics and optoelectronics applications. Copyright © 2020, The Authors. All rights reserved.

关键词： Titanium nitride

FLAIR MRI biomarkers of the Normal-Appearing Brain Matter (NABM) are related to APOE-4 status and CSF markers Aβ42 and Tau

学校读者我要写书评

暂无评论

Alzheimer's & Dementia 2023年第S3期19卷

作者： Karissa Chan Corinne E. Fischer Houman Khosravani Sandra E. Black Pascal Tyrrell Pejman Jabehdar Maralani Alan R. Moody April Khademi Electrical Computer and Biomedical Engineering Department Ryerson University Toronto ON Canada St. Michael’s Hospital Toronto ON Canada University of Toronto Toronto ON Canada Keenan Research Centre for Biomedical Science St. Michael’s Hospital Toronto ON Canada Faculty of Medicine Department of Psychiatry University of Toronto Toronto ON Canada Institute of Medical Sciences University of Toronto Toronto ON Canada Keenan Research Centre for Biomedical Science the Li Ka Shing Knowledge Institute St. Michael’s Hospital Toronto ON Canada Division of Neurology Department of Medicine University of Toronto Toronto ON Canada Heart and Stroke Foundation Canadian Partnership for Stroke Recovery Toronto ON Canada Sunnybrook Research Institute Toronto ON Canada Hurvitz Brain Sciences Program Sunnybrook Research Institute Toronto ON Canada Toronto Dementia Research Alliance Toronto ON Canada LC Campbell Cognitive Neurology Research Unit Sunnybrook Research Institute Toronto ON Canada Department of Statistical Science University of Toronto Toronto ON Canada Department of Medical Imaging University of Toronto Toronto ON Canada Keenan Research Centre for Biomedical Research the Li Ka Shing Knowledge Institute St. Michael’s Hospital Toronto ON Canada Ryerson University IAMLAB Department of Electrical Computer and Biomedical Engineering Toronto ON Canada

Background Reduced amyloid-beta-42 (Aβ42) and elevated total tau (t-tau) protein concentrations in the CSF are characteristic of Alzheimer’s disease (AD) pathology [1]. Aβ42 contributes to extracellular plaque formation between neurons [2]. The total level of tau, a microtubule-stabilizer in neuron axons [3], is associated with neuronal death [1]. Additionally, presence of ApoE4 (ε4) alleles is an established identifier for increased risk of AD [4]. Non-invasive imaging-based correlates of the CSF markers are lacking. This study examines correlations of novel FLAIR texture, intensity, and volume biomarkers, along with white matter lesion (WML) burden, with Aβ42, t-tau, and ε4 status. Method FLAIR volumes (n = 4044) from the ADNI database were used for analysis with CSF biomarkers. A subset (n = 921) was used for ε4 analysis based on available data. Normal-appearing brain matter (NABM) was obtained by removing CSF and WML. Macrostructural damage (MAD), microstructural damage (MID), and integrity (MII) texture biomarkers [5] were extracted from each NABM volume (Fig. 1), along with median intensity, NABM/ICV ratio, and normalized WML volume [5]. Relationships between FLAIR biomarkers and AD markers were described using parametric statistical analyses. Statistical significance was set at p<0.05. Result All FLAIR biomarkers were statistically significantly correlated with CSF Aβ42 levels. All features except MID and WML burden were significantly correlated with CSF t-tau levels (Table 1). MAD, MID, and WML burden showed negative correlations with Aβ42, while MAD showed a positive correlation with t-tau. Opposite trends were seen with MII, intensity, and NABM/ICV (Fig. 2). Significant differences between groups without and with one ε4 allele were found in all FLAIR biomarkers except WML burden. Significant differences in MAD, MII and NABM/ICV were found between groups with one and two ε4 alleles (Table 2). Conclusion FLAIR biomarkers were inversely associated with CSF Aβ

关键词：

Generation and Hall effect of skyrmions enabled using nonmagnetic point contacts

学校读者我要写书评

暂无评论

Physical Review B 2019年第18期100卷 184426-184426页

作者： Zidong Wang Xichao Zhang Jing Xia Le Zhao Keyu Wu Guoqiang Yu Kang L. Wang Xiaoxi Liu Suzanne G. E. te Velthuis Axel Hoffmann Yan Zhou Wanjun Jiang State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China Frontier Science Center for Quantum Information Tsinghua University Beijing 100084 China School of Science and Engineering The Chinese University of Hong Kong Shenzhen Guangdong 518172 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Electrical Engineering University of California Los Angeles California 90095 USA Department of Electrical and Computer Engineering Shinshu University 4-17-1 Wakasato Nagano 380–8553 Japan Materials Science Division Argonne National Laboratory Lemont Illinois 60439 USA

The generation and manipulation of magnetic skyrmions are perquisites for any skyrmion-based information processing devices, where skyrmions are used as nonvolatile information carriers. In this work, we report experimentally the skyrmion generation through the usage of a nonmagnetic conducting Ti/Au point contact in a device made of a Ta/CoFeB/TaOx trilayer film. Moreover, the accompanied topological charge-dependent skyrmion dynamics, namely the skyrmion Hall effect, is also observed in the same device. The creation process of a skyrmion has been numerically reproduced through micromagnetic simulations, in which the important role of the skyrmion-antiskyrmion pair formation is identified. The motion and Hall effect of a skyrmion, immediately after its creation, is described using a modified Thiele equation after taking into account the contribution from spatially inhomogeneous spin-orbit torques and the Magnus force. Our results on the simultaneous generation and manipulation of skyrmions using a nonmagnetic point contact are useful for understanding the ultrafast dynamics of skyrmion creation, which could also provide an effective pathway for designing skyrmion-based devices.

关键词： Dzyaloshinskii-Moriya interaction Hall effect Micromagnetism Skyrmions Spin texture Spin torque Magnetic multilayers Point contacts Magneto-optical Kerr effect Micromagnetic modeling