219 research outputs found
Does the Dirac Cone Exist in Silicene on Metal Substrates?
Absence of the Dirac cone due to a strong band hybridization is revealed to
be a common feature for epitaxial silicene on metal substrates according to our
first-principles calculations for silicene on Ir, Cu, Mg, Au, Pt, Al, and Ag
substrates. The destroyed Dirac cone of silicene, however, can be effectively
restored with linear or parabolic dispersion by intercalating alkali metal
atoms between silicene and the metal substrates, offering an opportunity to
study the intriguing properties of silicene without further transfer of
silicene from the metal substrates
Demonstration of chronometric leveling using transportable optical clocks beyond laser coherence limit
Optical clock network requires the establishment of optical frequency
transmission link between multiple optical clocks, utilizing narrow linewidth
lasers. Despite achieving link noise levels of 10, the final accuracy
is limited by the phase noise of the clock laser. Correlation spectroscopy is
developed to transmit frequency information between two optical clocks
directly, enabling optical clock comparison beyond the phase noise limit of
clock lasers, and significantly enhancing the measurement accuracy or shorten
the measurement time. In this letter, two compact transportable
Ca clocks are employed to accomplish the correlation
spectroscopy comparison, demonstrating an 10 cm level measurement accuracy of
chronometric leveling using a mediocre clock laser with linewidth of 200 Hz.
The relative frequency instability reaches ,
which is about 20 times better than the result with Rabi spectroscopy using the
same clock laser. This research greatly reduces the harsh requirements on the
performance of the clock laser, so that an ordinary stable-laser can also be
employed in the construction of optical clock network, which is essential for
the field applications, especially for the chronometric leveling
Image encryption for Offshore wind power based on 2D-LCLM and Zhou Yi Eight Trigrams
Offshore wind power is an important part of the new power system, due to the
complex and changing situation at ocean, its normal operation and maintenance
cannot be done without information such as images, therefore, it is especially
important to transmit the correct image in the process of information
transmission. In this paper, we propose a new encryption algorithm for offshore
wind power based on two-dimensional lagged complex logistic mapping (2D-LCLM)
and Zhou Yi Eight Trigrams. Firstly, the initial value of the 2D-LCLM is
constructed by the Sha-256 to associate the 2D-LCLM with the plaintext.
Secondly, a new encryption rule is proposed from the Zhou Yi Eight Trigrams to
obfuscate the pixel values and generate the round key. Then, 2D-LCLM is
combined with the Zigzag to form an S-box. Finally, the simulation experiment
of the algorithm is accomplished. The experimental results demonstrate that the
algorithm can resistant common attacks and has prefect encryption performance.Comment: accepted by Int. J. of Bio-Inspired Computatio
What we know about grief intervention: a bibliometric analysis
BackgroundGrief is a natural and individualized response to different losses, but if grief persists or becomes pathological, professional interventions are required. Grief and corresponding interventions have received increasing attention, as the related concepts have been incorporated into the DSM-5 and ICD-11. Therefore, we conducted a bibliometric analysis to explore the developments in the field of grief intervention research.MethodsArticles on grief interventions were systematically searched and screened from the Web of Science Core Collection. The retrieved data were analyzed and visualized using VOSviewer and Bibliometrix software for journals, authors, institutions, countries, references, and keywords.ResultsA total of 9,754 articles were included. The number of articles on grief interventions has increased significantly each year since 1990. Death Studies was the journal that published the most articles in this field. We identified 25,140 authors contributed to this research area and these authors were from 123 countries and 6,630 institutions. Boelen PA secured the first position in article production, Columbia University emerged as the most productive affiliation and the United States was the foremost leading in grief intervention research. The prevalent keywords utilized in this field comprised bereavement, grief, death, depression, and palliative care.ConclusionThe quantity of publications regarding grief interventions is increasing. Although most prior studies have focused on mortality, grief, and health, emerging themes such as COVID-19, grief among workers, and disfranchised grief have drawn increasing attention in recent years. Future studies may focus on investigating the complexities and challenges of grief, including its underlying mechanisms and impact on mental well-being
On the Use of Hybrid CFIE-EFIE for Objects Containing Closed-Open Surface Junctions
To effectively solve the electromagnetic scattering or radiation properties from the perfect electric conductor (PEC) objects containing closed-open surface junctions, how to establish the hybrid combined field integral equation-electric field integral equation (CFIE-EFIE) is studied, which is different with the existing scheme for the objects where the closed and open parts are separate. Further, it is found that when the integral equation is solved using the method of moments (MoM), if the widely used RWG basis functions are employed to expand the induced surface current, the CFIE-EFIE may give inaccurate numerical results for the objects containing fine structures. The numerical accuracy can be improved by introducing the linear-linear (LL) basis functions. Moreover, to pursue a high computational efficiency, the LL and RWG basis functions are simultaneously used to expand the current on the fine structures and other relatively smooth surfaces respectively, whose validity is verified by numerical results
Animate-A-Story: Storytelling with Retrieval-Augmented Video Generation
Generating videos for visual storytelling can be a tedious and complex
process that typically requires either live-action filming or graphics
animation rendering. To bypass these challenges, our key idea is to utilize the
abundance of existing video clips and synthesize a coherent storytelling video
by customizing their appearances. We achieve this by developing a framework
comprised of two functional modules: (i) Motion Structure Retrieval, which
provides video candidates with desired scene or motion context described by
query texts, and (ii) Structure-Guided Text-to-Video Synthesis, which generates
plot-aligned videos under the guidance of motion structure and text prompts.
For the first module, we leverage an off-the-shelf video retrieval system and
extract video depths as motion structure. For the second module, we propose a
controllable video generation model that offers flexible controls over
structure and characters. The videos are synthesized by following the
structural guidance and appearance instruction. To ensure visual consistency
across clips, we propose an effective concept personalization approach, which
allows the specification of the desired character identities through text
prompts. Extensive experiments demonstrate that our approach exhibits
significant advantages over various existing baselines.Comment: Github: https://github.com/VideoCrafter/Animate-A-Story Project page:
https://videocrafter.github.io/Animate-A-Stor
Correlation between cognitive impairment during the acute phase of first cerebral infarction and development of long-term pseudobulbar affect
Strategies in activating lymphatic system on symptom distress and health-related quality of life in patients with heart failure: secondary analysis of a pilot randomized controlled trial
BackgroundAbnormal interstitial fluid accumulation remains the major cause for patients with heart failure (HF) to endure a myriad of distressing symptoms and a decline in their health-related quality of life (HRQoL). The lymphatic system is essential in regulating fluid balance within the interstitial compartment and has recently been recognized as an important target for the prevention and mitigation of congestion. This study aimed to investigate the effects of exercises in activating lymphatic system on symptom distress and HRQoL among patients with HF.Methods and resultsThis was a pre-determined, secondary analysis of the TOLF-HF [The-Optimal-Lymph-Flow for Heart Failure (TOLF-HF)] study, a two-arm pilot randomized controlled trial evaluating the preliminary effects of the lymphatic exercise intervention in enhancing interstitial decongestion among patients with HF. Participants were randomized to receive either a four-week TOLF-HF program in addition to standard care or standard care alone. The Chinese version of the Minnesota Living with Heart Failure Questionnaire (MLHFQ) was employed to measure symptom distress and HRQoL before and after the intervention. Data analyses included descriptive statistics, the independent sample t-test, Pearson’s chi-square test, the Mann-Whitney U test, and covariance analysis. Of the 66 patients enrolled, 60 completed the study. The study results exhibited that the TOLF-HF intervention were effective in alleviating both physical and psychological symptom distress. The intervention group yielded significantly lower MLHFQ total scores in comparison to the control group. The odd ratio of achieving meaningful improvement in HRQoL in TOLF-HF group was 2.157 times higher than those in the control group.ConclusionsThe TOLF-HF program focusing on activating lymphatic system was effective in alleviating physical and psychological symptom distress as well as improving HRQoL for patients with HF. The tolerability, feasibility, and effectiveness of the TOLF-HF intervention make it a promising intervention for patients to manage HF.Clinical Trial Registrationhttp://www.chictr.org.cn/index.aspx, identifier (ChiCTR2000039121)
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