Overheated Topological Hall Effect: How Possible Artifacts Emerge?

Topological Hall effect (THE) originates from the real-space Berry phase that an electron gains when its spin follows the spatially varying non-trivial magnetization textures, such as skyrmions. Such topologically protected magnetization textures can provide great potential for information storage and processing, which spurs a new wave of THE research. Since directly imaging the skyrmions or detecting the magnetic diffraction of skyrmion lattice are more challenging than conducting Hall measurements, THE has been widely used to attest the presence of skyrmions. However, as the key feature of THE, the bump/dip in Hall signal is not a sufficient proof of THE [Phys. Rev. B, \textbf{98},180408(2018) and Phys. Rev. B. \textbf{98}, 214440(2018)]. Here, we use empirical numerical modeling to demonstrate all possible THE-like signals that two anomalous Hall effect (AHE) signals with opposite signs can superpose. We accentuate that similar Hall signals observed in experiments require scrupulous re-examination to claim the advent of THE and related skyrmions. In addition, the origin of two-channel AHE in several representative examples are also been analyzed

Overweight, Obesity, and Screen-Time Viewing Among Chinese School-Aged Children: National Prevalence Estimates From the 2016 Physical Activity and Fitness in China—The Youth Study

Purpose: This study presents the most recent estimates of prevalence of overweight, obesity, and screen-time viewing among Chinese school-aged children. Demographic differences in these estimates between sexes and resident locales were also examined. Methods: Cross-sectional analyses of 116,615 Chinese school children 9 to 17 years of age who participated in the 2016 Physical Activity and Fitness in China—the Youth Study project. Outcomes were the prevalence of children\u27s overweight (body mass index [BMI] ≥ 85th - \u3c 95th percentile) and obesity (BMI ≥95th percentile) (defined by the Working Group on Obesity in China) and not meeting screen-time viewing recommendations (“not meeting” was defined as more than 2 h per day of viewing activities after school). Analyses were conducted on the whole sample and by school grade cohorts (primary, junior middle, junior high schools), sex, and residence locales (urban, rural). Results: Overall, 14.4% (95% confidence interval (CI): 13.8%-15.0%) of children and adolescents were overweight, 11.9% (95% CI: 11.0%-13.0%) were obese, and 36.8% (95% CI: 34.7%-38.9%) did not meet screen-time viewing recommendations. Across the 3 grade cohorts, boys were more likely to be obese than girls, and primary and junior middle school children living in urban areas were more likely to be obese than those living in rural areas. Primary and junior middle school boys were less likely to meet screen-time recommendations than girls, and junior high school children living in urban areas were less likely to meet screen-time recommendations than school children of the same grades living in rural areas. Conclusion: In 2016, the prevalence of obesity among Chinese school children was about 12%, and about 37% of them did not meet screen-time viewing recommendations. The prevalence of obesity and sedentary behavior was generally higher among boys than among girls, and it was higher for children living in urban areas than for those living in rural areas

Modern Chinese National-Cultural Identity in the Context of Globalization

When modern China first entered the progression of globalization, it was faced with a strong "other" in the Western developed countries. The country’s backwardness on economic, political and military levels spawned a predicament for modern Chinese national-cultural identity. On the one hand, to stand out in the world, it must seek modernity; on the other hand, to maintain the nation’s independent traits, it must be alert to the dangers of a Western-centric modernity. China has a conflictual relationship with globalization dominated by Western countries and with its own cultural tradition. This double bind, with conflicts between the self and the other, on the one hand, and tradition and modernity, on the other hand, has contributed to the formation of the ambivalent characteristics of modern Chinese national-cultural identity.Quand la Chine moderne entra pour la première fois dans la mondialisation, elle se retrouva face à un puissant « autre » dans les pays développés occidentaux. Le retard économique, politique et militaire du pays engendra une situation difficile pour l’identité culturelle nationale chinoise moderne. D’une part, pour s’affirmer dans le monde, la Chine devait être en quête de modernité ; d’autre part, pour maintenir les traits caractéristiques de la nation, elle devait être alerte vis-à-vis des dangers d’une modernité centrée sur l’Occident.La Chine a une relation conflictuelle non seulement avec une mondialisation dominée par les pays occidentaux mais aussi avec sa propre tradition culturelle. Cette situation doublement difficile, due au conflit entre le moi et l’autre d’une part, et entre la tradition et la modernité d’autre part, a contribué à la formation des caractéristiques ambivalentes de l’identité culturelle nationale chinoise moderne

A sufficient and necessary condition of existence of blow-up radial solutions for a k-Hessian equation with a nonlinear operator

In this paper, we establish the results of nonexistence and existence of blow-up radial solutions for a k-Hessian equation with a nonlinear operator. Under some suitable growth conditions for nonlinearity, the result of nonexistence of blow-up solutions is established, a sufficient and necessary condition on existence of blow-up solutions is given, and some further results are obtained.&nbsp