2,847 research outputs found
Dibromidobis(1,10-phenanthroline-κ2 N,N′)cadmium(II)
The title compound, [CdBr2(C12H8N2)2], synthesized by the hydrothermal reaction of Cd(CH3COO)2·2H2O with NaBr and 1,10-phenanthroline, has the CdII cation coordinated by two Br− anions and four N atoms from two 1,10-phenanthroline ligands in a distorted octahedral geometry. The crystal packing is stabilized by intermolecular π–π interactions with centroid–centroid distances 3.572 (1) and 3.671 (1) Å together with C—H⋯Br hydrogen bonds
Statistically study the optimal local sources for cosmic ray nuclei and electron
The local sources, such as Geminga SNR, may play important role for the
anomaly of proton, electron and anisotropy in the past works. In fact, there
exists twelve SNRs around solar system within kpc. One question is that can
other SNRs also possibly contribute the spectra of nuclei and electron and
explain the special structure of anisotropy? In this work, under the
spatial-dependent propagation, we systematically study the contribution of all
local SNRs within 1 kpc around solar to the spectra of nuclei and electron, as
well as the energy dependence of anisotropy. As a result, only Geminga,
Monogem, and Vela SNRs have quantitive contribution to the nuclei and electron
spectra and anisotropy. Here, Geminga SNR is the sole optimal candidate and
Monogem SNR is controversial due to the tension of anisotropy between model
calculation and observations. The Vela SNR contributes a new spectral structure
beyond TeV energy, hinted by HESS, VERITAS, DAMPE and CALET measurements. More
interesting is that the electron anisotropy satisfies the Fermi-LAT limit below
TeV energy, but rises greatly and reaches at several TeV. This new
structure will shed new light to check our model. We hope that the new
structure of electron spectrum and anisotropy can be observed by space-borne
DAMPE and HERD and ground-based HAWC and LHAASO experiments in the near future.Comment: 11 pages, 8 figures, accepted by AP
(R)-7-Bromo-2,3,4,4a-tetrahydro-1H-xanthen-1-one
The title compound, C13H11BrO2, contains a tricyclic ring system with one chiral center which exhibits an R configuration. The crystal structure is devoid of any classical hydrogen bonding
Taiwanese parents’ perspectives on young children’s use of information communication technology
IntroductionHow parents think and feel about their children’s use of technology can influence how their kids behave online. The family’s socioeconomic status (SES) may also affect this influence. In light of this, this research emphasizes the need for more investigation into parental attitudes and the role of SES in shaping how children consume media.MethodsThis study surveyed 629 Taiwanese parents to explore their attitudes toward their young children’s use of information communication technology (ICT), usage patterns, and the interplay with socioeconomic status.ResultsThe findings revealed a significant disconnect: although approximately 50% of parents considered above six years old to be a suitable age for children to start ICT, over 80% of children had already engaged with ICT before that age, indicating a large disparity between parental expectations and actual initiation. Furthermore, parents highlighted “learning interest” and “various content” as the most positive impacts of children’s ICT use, while “addiction and overreliance” emerged as their primary concern. Notably, parents, as a whole, tended to perceive their child’s ICT use more negative than positively, with fathers displaying greater acceptance of negative viewpoints than mothers. Parental attitudes toward children’s ICT use were categorized into five clusters, ranging from balanced and optimistic views to value emphasis, conservatism, and negative doubts. This classification underscores the intricate and multifaceted nature of parental perspectives, encompassing both positive and negative outlooks on children’s ICT utilization.DiscussionThe findings underscore the nuanced character of parents’ attitudes toward technology, shaped by the intricacies and challenges posed by the digital era. These insights emphasize that parental attitudes go beyond a simplistic positive-negative divide, reflecting a comprehensive response to the opportunities and complexities inherent in the digital age
Body Massage Performance Investigation by Brain Activity Analysis
Massage has been widely applied to improve health and reduce stress. However, the performance difference between hands-on treatment and treatment by mechanical devices has been little mentioned. Therefore, the main aim of this paper is to investigate a subject's EEG performance under massage treatment applied by hand and treatment applied by mechanical devices. Massage was applied to four acupoints for three minutes each. The massage acupoint sequence was from left Jian-wai-yu, right Jian-wai-yu, left Zuo-fei-yu, and finally right Zuo-fei-yu. An EEG system of 32 channels was used. Twenty-four volunteers, mainly college students, were enrolled. EEG rhythm powers of each massage sessions were derived. Two-way ANOVA revealed that there were also significant interactions between the massage stage and the massage type on delta (P < 0.01), theta (P < 0.05), and beta rhythms (P < 0.01), and there were significant differences at different stages for the mechanical massage group (F = 5.557, P < 0.01). The mechanical massage group had more significant differences than the hands-on group for stage coherence of around coherence on alpha rhythm. Further rhythm power scalp topography between two massage methods is also investigated
The relationships among Taiwanese youth’s polychronicity, multitasking behavior and perceived learning performance in online learning
BackgroundThe advancement of digital technology implies the importance of polychronic learning. Since polychronicity is not equivalent to multitasking behavior, they need to be considered separately. However, less research has been explored on how polychronicity is related to multitasking behavior in the educational field.ObjectiveTo explore the relationships among polychronicity, multitasking behavior and learning performance (including knowledge acquisition and learning satisfaction) in an online learning environment.MethodsThe relationship among variables was analyzed from 865 responses obtained from a questionnaire survey, and independent sample t tests and SEM analysis were used to examine the research hypotheses.ResultsCollege students showed a higher frequency of multitasking behavior, time tangibility and scheduling preference, and learning satisfaction in multitasking online learning environments than high school students. Additionally, college students were different from high school students on the paths of involvement with people to multitasking behavior (Δ χ2= 5.42, p = 0.02) and scheduling preference to learning satisfaction (Δχ2 = 9.54, p = 0.002).ConclusionThe relationship among polychronicity, multitasking behavior and perceived learning performance in an online learning environment varies by student educational stage
Nighttime Thermal Infrared Image Colorization with Feedback-based Object Appearance Learning
Stable imaging in adverse environments (e.g., total darkness) makes thermal
infrared (TIR) cameras a prevalent option for night scene perception. However,
the low contrast and lack of chromaticity of TIR images are detrimental to
human interpretation and subsequent deployment of RGB-based vision algorithms.
Therefore, it makes sense to colorize the nighttime TIR images by translating
them into the corresponding daytime color images (NTIR2DC). Despite the
impressive progress made in the NTIR2DC task, how to improve the translation
performance of small object classes is under-explored. To address this problem,
we propose a generative adversarial network incorporating feedback-based object
appearance learning (FoalGAN). Specifically, an occlusion-aware mixup module
and corresponding appearance consistency loss are proposed to reduce the
context dependence of object translation. As a representative example of small
objects in nighttime street scenes, we illustrate how to enhance the realism of
traffic light by designing a traffic light appearance loss. To further improve
the appearance learning of small objects, we devise a dual feedback learning
strategy to selectively adjust the learning frequency of different samples. In
addition, we provide pixel-level annotation for a subset of the Brno dataset,
which can facilitate the research of NTIR image understanding under multiple
weather conditions. Extensive experiments illustrate that the proposed FoalGAN
is not only effective for appearance learning of small objects, but also
outperforms other image translation methods in terms of semantic preservation
and edge consistency for the NTIR2DC task.Comment: 14 pages, 14 figures. arXiv admin note: text overlap with
arXiv:2208.0296
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