3,225 research outputs found
Long Range Intrinsic Ferromagnetism in Two Dimensional Materials and Dissipationless Future Technologies
The inherent susceptibility of low-dimensional materials to thermal
fluctuations has long been expected to poses a major challenge to achieving
intrinsic long-range ferromagnetic order in two-dimensional materials. The
recent explosion of interest in atomically thin materials and their assembly
into van der Waals heterostructures has renewed interest in two-dimensional
ferromagnetism, which is interesting from a fundamental scientific point of
view and also offers a missing ingredient necessary for the realization of
spintronic functionality in van der Waals heterostructures. Recently several
atomically thin materials have been shown to be robust ferromagnets. Such
ferromagnetism is thought to be enabled by magneto crystalline anisotropy which
suppresses thermal fluctuations. In this article, we review recent progress in
two-dimensional ferromagnetism in detail and predict new possible
two-dimensional ferromagnetic materials. We also discuss the prospects for
applications of atomically thin ferromagnets in novel dissipationless
electronics, spintronics, and other conventional magnetic technologies.
Particularly atomically thin ferromagnets are promising to realize time
reversal symmetry breaking in two-dimensional topological systems, providing a
platform for electronic devices based on the quantum anomalous Hall Effect
showing dissipationless transport. Our proposed directions will assist the
scientific community to explore novel two-dimensional ferromagnetic families
which can spawn new technologies and further improve the fundamental
understanding of this fascinating area.Comment: To be appear in Applied Physics Review
Confidence-aware Non-repetitive Multimodal Transformers for TextCaps
When describing an image, reading text in the visual scene is crucial to
understand the key information. Recent work explores the TextCaps task, i.e.
image captioning with reading Optical Character Recognition (OCR) tokens, which
requires models to read text and cover them in generated captions. Existing
approaches fail to generate accurate descriptions because of their (1) poor
reading ability; (2) inability to choose the crucial words among all extracted
OCR tokens; (3) repetition of words in predicted captions. To this end, we
propose a Confidence-aware Non-repetitive Multimodal Transformers (CNMT) to
tackle the above challenges. Our CNMT consists of a reading, a reasoning and a
generation modules, in which Reading Module employs better OCR systems to
enhance text reading ability and a confidence embedding to select the most
noteworthy tokens. To address the issue of word redundancy in captions, our
Generation Module includes a repetition mask to avoid predicting repeated word
in captions. Our model outperforms state-of-the-art models on TextCaps dataset,
improving from 81.0 to 93.0 in CIDEr. Our source code is publicly available.Comment: 9 pages; Accepted by AAAI 202
Bis(chloroacetato-κO)bis(trimethylsilylmethyl)tin(IV)
In the title complex, [Sn(C2H2ClO2)2(C4H11Si)2], the SnIV ion is coordinated in a distorted tetrahedral environment formed by two O atoms from two monodenate chloroacetato ligands and two C atoms from two trimethyl silyl ligands. Two further weak intramolecular Sn⋯O contacts [2.744 (2) and 2.655 (2) Å] are formed by the chloroacetato ligands
Proteomic analysis of immediate-early response plasma proteins after 70% and 90% partial hepatectomy
AIM: Partial hepatectomy (PH) induces robust hepatic regenerative and metabolic responses that are considered to be triggered by humoral factors. The aim of the study was to identify plasma protein factors that potentially trigger or reflect the body's immediate-early responses to liver mass reduction.
METHODS: Male C57BL/6 mice were subjected to sham operation, 70% PH or 90% PH. Blood was collected from the inferior vena cava at 20, 60 and 180 min after surgery.
RESULTS: Using a label-free quantitative mass spectrometry-based proteomics approach, we identified 399 proteins exhibiting significant changes in plasma expression between any two groups. Of the 399 proteins, 167 proteins had multiple unique sequences and high peptide ID confidence (>90%) and were defined as priority 1 proteins. A group of plasma proteins largely associated with metabolism is enriched after 70% PH. Among the plasma proteins that respond to 90% PH are a dominant group of proteins that are also associated with metabolism and one known cytokine (platelet factor 4). Ninety percent PH and 70% PH induces similar changes in plasma protein profile.
CONCLUSION: Our findings enable us to gain insight into the immediate-early response of plasma proteins to liver mass loss. Our data support the notion that increased metabolic demands of the body after massive liver mass loss may function as a sensor that calibrates hepatic regenerative response
Tensor Completion via Leverage Sampling and Tensor QR Decomposition for Network Latency Estimation
In this paper, we consider the network latency estimation, which has been an
important metric for network performance. However, a large scale of network
latency estimation requires a lot of computing time. Therefore, we propose a
new method that is much faster and maintains high accuracy. The data structure
of network nodes can form a matrix, and the tensor model can be formed by
introducing the time dimension. Thus, the entire problem can be be summarized
as a tensor completion problem. The main idea of our method is improving the
tensor leverage sampling strategy and introduce tensor QR decomposition into
tensor completion. To achieve faster tensor leverage sampling, we replace
tensor singular decomposition (t-SVD) with tensor CSVD-QR to appoximate t-SVD.
To achieve faster completion for incomplete tensor, we use the tensor
-norm rather than traditional tensor nuclear norm. Furthermore, we
introduce tensor QR decomposition into alternating direction method of
multipliers (ADMM) framework. Numerical experiments witness that our method is
faster than state-of-art algorithms with satisfactory accuracy.Comment: 20 pages, 7 figure
Implementing universal nonadiabatic holonomic quantum gates with transmons
Geometric phases are well known to be noise-resilient in quantum
evolutions/operations. Holonomic quantum gates provide us with a robust way
towards universal quantum computation, as these quantum gates are actually
induced by nonabelian geometric phases. Here we propose and elaborate how to
efficiently implement universal nonadiabatic holonomic quantum gates on simpler
superconducting circuits, with a single transmon serving as a qubit. In our
proposal, an arbitrary single-qubit holonomic gate can be realized in a
single-loop scenario, by varying the amplitudes and phase difference of two
microwave fields resonantly coupled to a transmon, while nontrivial two-qubit
holonomic gates may be generated with a transmission-line resonator being
simultaneously coupled to the two target transmons in an effective resonant
way. Moreover, our scenario may readily be scaled up to a two-dimensional
lattice configuration, which is able to support large scalable quantum
computation, paving the way for practically implementing universal nonadiabatic
holonomic quantum computation with superconducting circuits.Comment: v3 Appendix added, v4 published version, v5 published version with
correction
Characterizing pump line phase offset of a single-soliton Kerr comb by dual comb interferometry
We experimentally demonstrate phase retrieval of a single-soliton Kerr comb
using electric field cross-correlation implemented via dual-comb
interferometry. The phase profile of the Kerr comb is acquired through the
heterodyne beat between the Kerr comb and a reference electro-optical comb with
a pre-characterized phase profile. The soliton Kerr comb has a nearly flat
phase profile, and the pump line is observed to show a phase offset which
depends on the pumping parameters. The experimental results are in agreement
with numerical simulations. Our all-linear approach enables rapid measurements
(3.2 s) with low input power (20 W)
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