3,204 research outputs found

    The First Year IceCube-DeepCore Results

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    The IceCube Neutrino Observatory includes a tightly spaced inner array in the deepest ice, called DeepCore, which gives access to low-energy neutrinos with a sizable surrounding cosmic ray muon veto. Designed to be sensitive to neutrinos at energies as low as 10 GeV, DeepCore will be used to study diverse physics topics with neutrino signatures, such as dark matter annihilations and atmospheric neutrino oscillations. The first year of DeepCore physics data-taking has been completed, and the first observation of atmospheric neutrino-induced cascades with IceCube and DeepCore are presented.Comment: 4 pages, 3 figures, TAUP 2011 (Journal of Physics: Conference Series (JCPS)

    Numerical and Physical Modeling of the Effect of Roughness Height on Cavitation Index in Chute Spillways

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    © 2019, Iran University of Science and Technology. This study presents the results of physical and numerical modeling of the effect of bed roughness height of chute spillways on the cavitation index. A 1:50-scale physical hydraulic model of the chute spillway of Surk Dam was constructed at the hydraulic laboratory of Shahrekord University, Iran. The experiments were conducted for different flow rates and the parameters of pressure, velocity, and flow depth in 26 positions along the chute. Finally, the ANSYS-FLUENT model was calibrated in the chute spillway using the experimental data by assumptions of two-phase volume of fluid and k–Δ (RNG) turbulence models. The cavitation index in different sections of the chute spillway was calculated for different values of bed roughness including the roughness heights of 1, 2, and 2.5 mm. Results showed that the minimum values of the cavitation index were 0.2906, 0.2733, and 0.2471 for the roughness heights of 1, 2, and 2.5 mm, respectively. The statistical significance analysis showed that reducing the roughness height from 2.5 to 1 mm would not change significantly the value of the cavitation index at 95% confidence interval

    Single image defocus estimation by modified gaussian function

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    © 2019 John Wiley & Sons, Ltd. This article presents an algorithm to estimate the defocus blur from a single image. Most of the existing methods estimate the defocus blur at edge locations, which further involves the reblurring process. For this purpose, existing methods use the traditional Gaussian function in the phase of reblurring but it is found that the traditional Gaussian kernel is sensitive to the edges and can cause loss of edges information. Hence, there are more chances of missing spatially varying blur at edge locations. We offer the repeated averaging filters as an alternative to the traditional Gaussian function, which is more effective, and estimate the spatially varying defocus blur at edge locations. By using repeated averaging filters, a blur sparse map is computed. The obtained sparse map is propagated by integration of superpixels segmentation and transductive inference to estimate full defocus blur map. Our adopted method of repeated averaging filters has less computational time of defocus blur map estimation and has better visual estimates of the final defocus recovered map. Moreover, it has surpassed many previous state-of-the-art proposed systems in terms of quantative analysis

    Modification of cellulose ether with organic carbonate for enhanced thermal and rheological properties: Characterization and analysis

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    Reduction in viscosity at higher temperatures is the main limitation of utilizing cellulose ethers in high thermal reservoir conditions for petroleum industry applications. In this study, cellulose ether (hydroxyethyl methyl cellulose (HEMC)) is modified using organic carbonates, i.e., propylene carbonate (PC) and diethyl carbonate (DEC), to overcome the limitation of reduced viscosity at high temperatures. The polymer composites were characterized through various analytical techniques, including Fourier-transform infrared (FTIR), H-NMR, X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), -potential measurement, molecular weight determination, and rheology measurements. The experimental results of structural and morphological characterization confirm the modification and formation of a new organic carbonate-based cellulose ether. The thermal analysis revealed that the modified composites have greater stability, as the modified samples demonstrated higher vaporization and decomposition temperatures. -potential measurement indicates higher stability of DEC- and PC-modified composites. The relative viscometry measurement revealed that the modification increased the molecular weight of PC- and DEC-containing polymers, up to 93,000 and 99,000 g/moL, respectively. Moreover, the modified composites exhibited higher levels of stability, shear strength and thermal resistance as confirmed by viscosity measurement through rheology determination. The observed increase in viscosity is likely due to the enhanced inter- and intramolecular interaction and higher molecular weight of modified composites. The organic carbonate performed as a transesterification agent that improves the overall properties of cellulose ether (HEMC) at elevated temperatures as concluded from this study. The modification approach in this study will open the doors to new applications and will be beneficial for substantial development in the petroleum industry

    ALEXITHYMIA DIFFERENCES AND THE THEORY OF MIND AMONG CHILDREN WITH NURSING CAREERS PARENTS

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    Different studies have presented various results on Alexithymia and Theory of Mind in both women and men. Accordingly, the purpose of this study is to determine differences of alexithymia and theory of mind among Children survivors in the Kurdistan's among children with nursing careers parents. Therefore, 284 nurses (123 boys and 161 girls) were chosen among children with nursing careers parents located in hospital sanandaj in 2016. Then the respondents completed the Toronto Alexithymia and Mind Reading through Eyes questionnaires. Descriptive Statistical Method and Multi-Variate Variance Analysis were used to analyze the data. Results of the research showed that the rates of theory of mind and externally orientated thinking were different in both genders. In other words, survival boys showed higher levels of externally orientated thinking and lower levels of theory of mind compared to survival girls

    TeV gamma-UHECR anisotropy by decaying nuclei in flight: first neutrino traces?

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    Ultra High Cosmic Rays) made by He-like lightest nuclei might solve the AUGER extragalactic clustering along Cen A. Moreover He like UHECR nuclei cannot arrive from Virgo because the light nuclei fragility and opacity above a few Mpc, explaining the Virgo UHECR absence. UHECR signals are spreading along Cen-A as observed because horizontal galactic arms magnetic fields, bending them on vertical angles. Cen A events by He-like nuclei are deflected as much as the observed clustered ones; proton will be more collimated while heavy (iron) nuclei are too much dispersed. Such a light nuclei UHECR component coexist with the other Auger heavy nuclei and with the Hires nucleon composition. Remaining UHECR spread group may hint for correlations with other gamma (MeV-Al^{26} radioactive) maps, mainly due to galactic SNR sources as Vela pulsar, the brightest, nearest GeV source. Other nearest galactic gamma sources show links with UHECR via TeV correlated maps. We suggest that UHECR are also heavy radioactive galactic nuclei as Ni^{56}, Ni^{57} and Co^{60} widely bent by galactic fields. UHECR radioactivity (in ÎČ\beta and Îł\gamma channels) and decay in flight at hundreds keV is boosted (by huge Lorentz factor (nearly a billion) leading to PeVs electrons and consequent synchrotron TeVs gamma offering UHECR-TeV correlated sky anisotropy. Moreover also rarest and non-atmospheric electron and tau neutrinos secondaries at PeVs, as the first two rarest shower just discovered in ICECUBE, maybe the first signature of such expected radioactive secondary tail.Comment: 7 pages,3 figures. arXiv admin note: substantial text overlap with arXiv:1201.015

    The study of teachers’ motives and usage of social networks

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    Background and Objectives: Users enter social networks with different motives and their participation in social networks is also different from each other. Having different goals and motives, teachers as users of social networks choose various ways to participate in these networks. So, laying emphasis on the role of motivation in the ways teachers use social networks, the present study aims at identifying teachers’ motivation and the ways they use social networks. The specific objectives of this research are: 1. determining how virtual social networks are used by teachers who are actively using them. 2. Identifying the feedback of teachers in virtual social networks.  Methods: The present research is done using qualitative research approach. The field of this research includes groups and forums of Iranian teachers’ social networks. In this research, 30 teachers who were active in social networks participated among whom 14 teachers were male and 16 teachers were female. All of these participants were managers of virtual channels and Various supergroups in social networks. They were selected using the logic of purposeful sampling and criterion-based method.  The selection criterion was the record or history of the group or channel, the number of the followers and the number of the visitors. Also, the teachers who were selected for the interview in addition to this criterion, were selected in the field of e- content generation in virtual social networks by the Roshd center site as an active content generator. Every interviewee mentioned their views in answer to the interview questions for 40 to 45 minutes. To analyze data, the theme analysis method was used. In this method, first the concepts and codes are extracted from the interview text and then the status of each theme from the type of inclusive, organizing, and basic is determined in the network of themes. In this research, in order to perform this process, the following steps were taken: 1. Frist, with the frequent screening and active reading of the data, the search for the meaning and discovery of patterns began by using  note-taking and punctuating the data (familiarity with the data). 2. After reading the data, the codes and concepts introducing the data were established (generating basic codes). 3. The identified codes were organized and transferred to certain themes (generating themes). 4. At this stage, the themes were named and reviewed as needed 5. The network of themes were generated to identify the basic, organizing and inclusive themes and the final report of the data was set.  Findings: The findings showed that teachers benefit from social networks for personal purposes such as entertainment, access to the news and communication with friends, and for occupational purposes, such as professional development and interaction with colleagues. The teachers’ motives affect how they provide feedback and how they participate in the social networks. Teachers show various feedbacks and participation in the social media which can be classified into six levels of reasonable diffusing, liking, controlling, counselling, criticizing, and commenting. Conclusion: Levels of teachers’ participation in the social networks in terms of their professional development and occupational learning is of significance from the perspective that the more the participation of the teachers in social networks can be organized by using specific projects and programs, so that they can move away from weak interactions, such as diffusing, liking, and controlling towards counselling, criticizing, and reasoning, they can be more profoundly involved with their own occupational themes in the social networks and can benefit from any time, any place, and interactive potentials of this environment for their own professional development.    ===================================================================================== COPYRIGHTS  ©2021 The author(s). This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, as long as the original authors and source are cited. No permission is required from the authors or the publishers.  ====================================================================================

    Organic and conventional tomato cropping systems.

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    Among several alternative agricultural systems have been developed, organic agriculture has deserved increasing interest from. The objective of this paper was comparing both organic (OS) and conventional (CS) tomato cropping systems for varieties DĂ©bora and Santa Clara, through an interdisciplinary study. The experiment was set up in a randomized blocks design with six replicates, in a dystrophic Ultisol plots measuring 25 ÂŽ 17 m. Cropping procedures followed by either local conventional or organic growers practices recommendations. Fertilization in the OS was done with organic compost, single superphosphate, dolomitic limes (5L, 60 g, and 60 g per pit), and sprayed twice a week with biofertilizer. Fertilization in the CS was done with 200 g 4-14-8 (NPK) per pit and, after planting, 30 g N, 33 g K and 10.5 g P per pit; from 52 days after planting forth, plants were sprayed once a week with foliar fertilizer. In the CS, a blend of insecticides, fungicides and miticides was sprayed twice a week, after planting. In the OS, extracts of black pepper, garlic, and Eucalyptus; Bordeaux mixture, and biofertilizer, were applied twice a week to control diseases and pests. Tomato spotted wilt was the most important disease in the OS, resulting in smaller plant development, number of flower clusters and yield. In the CS, the disease was kept under control, and the population of thrips, the virus vector, occurred at lower levels than in the OS. Variety Santa Clara presented greater incidence of the viral disease, and for this reason had a poorer performance than 'DĂ©bora', especially in the OS. Occurrence of Liriomyza spp. was significantly smaller in the OS, possibly because of the greater frequency of Chrysoperla. The CS had smaller incidence of leaf spots caused by Septoria lycopersici and Xanthomonas vesicatoria. However, early blight and fruit rot caused by Alternaria solani occurred in larger numbers. No differences were observed with regard to the communities of fungi and bacteria in the phylloplane, and to the occurrence of weeds
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