Recent literature typically finds a U shaped relationship between life satisfaction and age. Age profiles, however, are not identified without forcing arbitrary restrictions on the cohort and/or time profiles. In this paper we report what can be identified about the relationship between life satisfaction and age without applying such restrictions. Also, we identify the restrictions needed to co...

A new approach for investigating the correlation between research quality and citation counts is presented and applied to a case study of the relationship between peer evaluations reflected in scholarly book reviews and the citation frequencies of reviewed books. Results of the study designate a J-shaped distribution between the considered variables, presumably caused by a skewed allocation of ...

BACKGROUND Thorny catfishes exhibit large variations in swim bladder morphology. These organs are of different sizes, forms and may have simple or branched diverticula. The swim bladder plays an important role in otophysans because it enhances their hearing sensitivity by transmitting sound pressure fluctuations via ossicles to the inner ear. METHODOLOGY/PRINCIPAL FINDINGS To investigate if a...

Based on the sample of serial M&A Chinese listed companies from 2010–2019, this paper intends to investigate impact innovation performance and financing constraints digital inclusive finance (DIF). The empirical results show that an inverted U-shaped relationship exists between first goes up then down. mechanism analysis play a mediating role in performance, while DIF plays moderating effec...

With the rapid development of social economy, human has been greatly improved. However, gap between rich and poor still exists, which restricts further society. In order to study relationship security expenditure common development, we constructed, for this paper, Human Common Development Index, made a regression analysis development. The results showed that, in China, obvious remarkable progre...

We prove that the Lorenz equations support a strange attractor, as conjectured by Ed-ward Lorenz in 1963. We also prove that the attractor is robust, i.e., it persists under small perturbations of the coeecients in the underlying diierential equations. The proof is based on a combination of normal form theory and rigorous numerical computations.

By applying the undetermined coefficient method, this paper finds homoclinic and heteroclinic orbits in the Chen system. It analytically demonstrates that the Chen system has one heteroclinic orbit of Ši’lnikov type that connects two nontrivial singular points. The Ši’lnikov criterion guarantees that the Chen system has Smale horseshoes and the horseshoe chaos. In addition, there also exists on...