Human Capital and Risky Asset Allocation

Much research has been done to examine the relation between investors\u27 human capital and their financial asset allocation. While some showed that the value of human capital should be taken into consideration to make financial asset allocation decisions on the composition of investing portfolios, most argued not. In this paper, we selected the monthly return of 9 industrial ETFs from June of 2007 to July 2011, used the present value of total future income as estimate of human capital, and relied on the Mean-Variance Optimal Asset Allocation framework to reexamine if human capital will impact investors optimal financial portfolios. Based on our tests, we found significant connection between human capital and risky asset allocation, which resulted in significant change to weights allocated to the risk assets to create a Mean-Variance optimal portfolio

The influence of contact area between implant and its adjacent teeth on finite element analysis

The aim of this work is to investigate the influence of contact area between the first molar implant and its adjacent teeth on finite element analysis. Five types of finite element contact models containing implant and its adjacent teeth were established: non-contact model (C0), contact models with different contact area (C1, C2, C3, C4). An occlusal force was applied to finite element models to calculate the stress of implant and bone interface on mandible. Compared with the group C0, the stress of alveolar bone surrounding the implant in other groups decreased 88.08 % at most, but the stress of cancellous bone surrounding the natural teeth increased 59.42 %. In summary, a proper small contact area can not only reduce the stress concentration on the implant region, but also can avoid an excessive stress in the periodontal ligament and alveolar bone around the natural teeth. The finite element results revealed that it is effectively to distribute the load implant suffered, especially to reduce the stress generated by the lateral load when the first molar implant has a small contact with its adjacent teeth

Research on Internet Technology Innovation and Information Security Challenges in New Vehicle Energy Sector

With the rapid proliferation and advancement of new energy vehicles, Internet technology has garnered significant attention and application in this field. This study focuses on innovations in Internet technology in the domain of new automotive energy and the associated information security challenges. The innovations in Internet technology relevant to new energy vehicles, including Telematics, intelligent driving, and remote control, are initially explored. Subsequently, the information security challenges brought about by these innovations are analyzed, encompassing various aspects such as data privacy breaches, remote attacks, and malware infections. The significance of information security in the development of new energy vehicles is emphasized. Solutions and suggestions, including the strengthening of encryption technology, the establishment of a robust security framework, and the enhancement of user education and awareness, are put forward. In conclusion, the current state of research on Internet technology innovation and information security challenges is summarized, and it is suggested that future research should delve deeper into the trajectory of Internet technology development in the field of new energy vehicles, along with the attendant information security challenges, to provide theoretical and practical support for promoting the healthy development and secure application of the new energy vehicle industry

Changes in Stable Fraction of Soil Organic Carbon and Microbial Structure in Response of Grazing Intensity

Carbon sequestration is one of the most important ecological function of the grassland. Soils contain more carbon than in vegetation in the form of soil organic matter (SOM). But grassland soils are vulnerable to disturbances caused by human activities. Grazing may result in various disturbances to both soil and vegetation under different grazing intensities (Bai et al., 2012). Grazing led to the shifts in amount and composition of soil organic matter. In previous studies, the chemical methods were used to separate soil into the different pools according to the stability of SOM (Carvalho Leite et al., 2004), but they cannot be convictive for their chemical destruction upon the SOM structure. In this study, we use more credible fractionating method to separate stable part of the SOM based on the dry sieving and winnowing (Kirkby et al., 2011). Stable carbon fraction has two origins: microbial debris and recalcitrant plant materials (Lehmann et al., 2007). Evidences have showed that soil microbial community alters metabolic rates by changing its composition adjust to stoichiometry of substrates. We hypothesize that carbon content stable fraction SOM in the surface soils would decline as the intensity increasing, but the stoichiometry of carbon and nutrients (N and P) would remain constant. We also predict that the relative importance in carbon sequestration of microbial groups would change due to the soil environmental alteration. The objectives of the study is to evaluate the effects of grazing intensity (GI) on carbon in more stabilized SOM and on soil microbial community structure in steppe