46 research outputs found
Uncertain Lifetime, Bequest, Annuity and Capital accumulation under different motives of Bequests.
Master'sMASTER OF SOCIAL SCIENCE
How do parents respond to regulation of sugary drinks in child care? Evidence from California
Excessive sugar intake is associated with higher risk for a range of diseases in children, including childhood obesity. To reduce sugar intake in children, California regulates the provision of sugar-sweetened beverages and juice by child care facilities. The regulation may reduce the consumption of beverages high in sugar in the short run and weaken their preferences for sugary drinks in the long run. Whether these objectives are achieved depends on how parents respond to the regulation by providing sugary drinks at home. Using detailed scanner data on grocery purchases, we find that affected California households increased their juice purchases right after the regulation became effective. However, this increase disappears after 1 year. Moreover, we do not find an increase in the purchases of sugary substitutes. Our findings suggest that parents provide more juice for their children after child care facilities limit their provision of sugary beverage, but such offsetting behavior disappears after 1 year. Regulating the consumption of sugary drinks in child care facilities may be an effective policy to lower children's preferences for sugary drinks
Integrated Regulatory Network Reveals the Early Salt Tolerance Mechanism of Populus Euphratica
Salinization is one of the major factors that threaten the existence of plants worldwide. Populus euphratica has been deemed to be a promising candidate for stress response research because of its high capacity to tolerate extreme salt stress. We carried out a genome-wide transcriptome analysis to identify the differentially expressed genes (DEGs) response to salt shock and elucidate the early salt tolerance mechanisms in P. euphratica. Both hierarchical clustering and DEG analysis demonstrated a predominant variation from time-course rather than NaCl intensity within 24 hours salt shock. Among the identified 1,678 salt-responsive DEGs, 74.1% (1,244) have not been reported before. We further created an integrated regulatory gene network of the salt response in P. euphratica by combining DEGs, transcription factors (TFs), Helitrons, miRNAs and their targets. The prominent pathways in this network are plant hormone transduction, starch and sucrose metabolism, RNA transport, protein processing in endoplasmic reticulum, etc. In addition, the network indicates calcium-related genes play key roles in P. euphratica response to salt shock. These results illustrated an overview of the systematic molecular response in P. euphratica under different intensities of salt shock and revealed the complex regulatory mechanism
Performance Evaluation of High-Speed Polar Coded CO-OFDM System with Nonlinear and Linear Impairments
Characteristics of Magnetic Fields Induced by the Wake of an Underwater Vehicle
Underwater vehicles generate hydrodynamic wakes within a large area that last for a longtime during navigation, thus generating induced magnetic fields, and these are of great significance for detecting and tracking underwater vehicles. In combination with the wakefield and magnetic field simulations, this study adopts the dynamic overlapping mesh technology to conduct a numerical simulation of the wake magnetic field during the movement of an underwater vehicle. This paper introduces the causes of formation and laws of evolution of the wake magnetic field, analyzes its spatial distribution and time-domain changes, and discusses the time-frequency domain characteristics at different monitoring points as well as the effects of navigation speed and acceleration on wake magnetic fields. Our results indicate that the wake magnetic field of an underwater vehicle belongs to a low-frequency weak signal of 0–5 Hz; as the navigation speed increases, the barycenter frequency of the wake magnetic field decreases and the half-energy bandwidth increases. The increase in acceleration of the underwater vehicle will cause a higher growth rate of the wake magnetic field. This paper provides a theoretical reference for the detection of underwater vehicles based on wake magnetic fields
Characteristics of Magnetic Fields Induced by the Wake of an Underwater Vehicle
Underwater vehicles generate hydrodynamic wakes within a large area that last for a longtime during navigation, thus generating induced magnetic fields, and these are of great significance for detecting and tracking underwater vehicles. In combination with the wakefield and magnetic field simulations, this study adopts the dynamic overlapping mesh technology to conduct a numerical simulation of the wake magnetic field during the movement of an underwater vehicle. This paper introduces the causes of formation and laws of evolution of the wake magnetic field, analyzes its spatial distribution and time-domain changes, and discusses the time-frequency domain characteristics at different monitoring points as well as the effects of navigation speed and acceleration on wake magnetic fields. Our results indicate that the wake magnetic field of an underwater vehicle belongs to a low-frequency weak signal of 0–5 Hz; as the navigation speed increases, the barycenter frequency of the wake magnetic field decreases and the half-energy bandwidth increases. The increase in acceleration of the underwater vehicle will cause a higher growth rate of the wake magnetic field. This paper provides a theoretical reference for the detection of underwater vehicles based on wake magnetic fields
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Research and Practice on the Construction of Professional Cluster in Application-Oriented Local Undergraduate Universities: Taking Environmental Chemical Engineering Professional Cluster in Pingdingshan University as an Example
Based on the analysis of the importance of professional cluster construction by ecological theory, with the change of social demand for talents, this paper explores the practice of environmental chemical professional cluster construction in Pingdingshan University, including gradually perfecting teaching conditions and reforming teaching mode, breaking through the limitations of resources, integrating the boundaries of colleges and departments, integrating multiple resources, innovating systems and mechanisms, reconstructing professional clusters, deconstructing professional connotations, reorganizing curriculum systems, etc., in order to better build the ecological chain network of education in application-oriented colleges and universities, realize the deep integration of industry and education, train future-oriented interdisciplinary applied talents of new engineering, and realize the construction of characteristic professional cluster in application-oriented colleges
Double-Gap Magnetic Flux Concentrator Design for High-Sensitivity Magnetic Tunnel Junction Sensors
Principle and Feasibility Study of Proposed Hydrate-Based Cyclopentane Purification Technology
The separation of azeotropic mixtures has conventionally been one of the most challenging tasks in industrial processes due to the fact that components in the mixture will undergo gas–liquid phase transition at the same time. We proposed a method for separating azeotropes using hydrate formation as a solid–liquid phase transition. The feasibility of hydrate-based separation is determined by analyzing the crystal structure and chemical bonds of hydrate. Taking the azeotrope cyclopentane and neohexane in petroleum as an example, cyclopentane (95%) was purified to 98.56% yield using the proposed hydrate-based cyclopentane purification technology. However, this is difficult to achieve using conventional distillation methods. The proposed method is simple in operation and yields a good separation effect. This study provides a new method for separating cyclopentane and neohexane