1,156 research outputs found
Low regularity global well-posedness of axisymmetric MHD equations with vertical dissipation and magnetic diffusion
Consideration in this paper is the global well-posedness for the 3D
axisymmetric MHD equations with only vertical dissipation and vertical magnetic
diffusion. The existence of unique low-regularity global solutions of the
system with initial data in Lorentz spaces is established by using higher-order
energy estimates and real interpolation method.Comment: 21 page
Influence of Reciprocal links in Social Networks
In this Letter, we empirically study the influence of reciprocal links, in
order to understand its role in affecting the structure and function of
directed social networks. Experimental results on two representative datesets,
Sina Weibo and Douban, demonstrate that the reciprocal links indeed play a more
important role than non-reciprocal ones in both spreading information and
maintaining the network robustness. In particular, the information spreading
process can be significantly enhanced by considering the reciprocal effect. In
addition, reciprocal links are largely responsible for the connectivity and
efficiency of directed networks. This work may shed some light on the in-depth
understanding and application of the reciprocal effect in directed online
social networks
Benzene-1,4-diol–5-(1H-imidazol-1-yl)pyrimidine (1/1)
The asymmetric unit of title compound, C7H6N4·C6H6O2, contains one 5-(1H-imidazol-1-yl)pyrimidine molÂecule and two half benzene-1,4-diol molÂecules; the benzene-1,4-diol molÂecules are located on individual inversion centers. In the pyrimidine molÂecule, the imidazole ring is twisted with respect to the pyrimidine ring at a dihedral angle of 25.73 (7)°. In the crystal, O—H⋯N hydrogen bonds link the molÂecules to form supraÂmolecular chains. π–π stacking is also observed in the crystal, the centroid–centroid distance between parallel imdazole rings being 3.5543 (16) Å
Influence of dust on temperature measurement using infrared thermal imager
Temperature measurement by infrared thermal imager is an attractive technique in many fields, and it is of great importance to ensure the measurement accuracy of the infrared thermal imager. Aiming at the influence of dust on the temperature measurement of infrared thermal imager, this paper summarized the dust influence into three categories: dust on the surface of the measured object, dust on the infrared thermal imager’s lens and dust in the optical path between the measured object and the infrared thermal imager, and conducted three dust experiments. To quantify the measurement errors caused by dust, the infrared thermal image features that are affected by dust are extracted and a compensation model is established based on polynomial regression. The results indicate that dust can introduce measurement errors of infrared thermal imager and the proposed compensation method can compensate for the measurement errors caused by dust and improve the accuracy of infrared thermal imager
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