Xuzhou Institute of Technology

About: Xuzhou Institute of Technology is a education organization based out in Xuzhou, China. It is known for research contribution in the topics: Catalysis & Adsorption. The organization has 1696 authors who have published 1521 publications receiving 13541 citations.

Existence Theory for an Arbitrary Order Fractional Differential Equation with Deviating Argument

Abstract: In this paper, we are concerned with the existence criteria for positive solutions of the following nonlinear arbitrary order fractional differential equations with deviating argument $$\left \{\begin{array}{l@{\quad}l}D_{0^+}^{\alpha}u(t)+h(t)f(u(\theta(t)))=0, & t\in ( 0,1 ),\ n-1 3 (n??), $D_{0^{+}}^{\alpha}$ is the standard Riemann-Liouville fractional derivative of order ?,f:[0,?)?[0,?), h(t):[0,1]?(0,?) and ?:(0,1)?(0,1] are continuous functions. Some novel sufficient conditions are obtained for the existence of at least one or two positive solutions by using the Krasnosel'skii's fixed point theorem, and some other new sufficient conditions are derived for the existence of at least triple positive solutions by using the fixed point theorems developed by Leggett and Williams etc. In particular, the existence of at least n or 2n?1 distinct positive solutions is established by using the solution intervals and local properties. From the viewpoint of applications, two examples are given to illustrate the effectiveness of our results.

Chemical looping catalytic steam gasification (CLCSG) of algae over La1-xBaxFeO3 perovskites for syngas production

Abstract: Multifunctional perovskite-type oxides (ABO3) with flexible chemical tailoring characteristics and unique physical properties, are attracting an ever-increasing attention of scientists in the field of biomass chemical looping gasification process. Barium substituted lanthanum ferrite La1-xBaxFeO3 (x = 0, 0.3, 0.5, 0.7, 0.9, 1.0) with perovskite structure was used as oxygen carrier for algae chemical looping catalytic steam gasification (CLCSG) process for the first time. The effects of the Ba-substitution, mass ratio of perovskite and algae (P/A), temperature and water injection rate on the gasification performance were investigated. Results showed that the activity of LaFeO3 was dramatically improved by Ba substitution due to the formation of Fe4+/Fe3+ and oxygen vacancies. Among all the doped LaFeO3 perovskites, La0.3Ba0.7FeO3 (L3B7F) exhibited the best performance and gave highest syngas yield, carbon conversion and gasification efficiency. A maximum syngas yield of 1.00 m3/kg-Algae, carbon conversion of 98.86% and gasification efficiency of 96.71% were obtained at 900 °C with a water injection rate of 0.3 ml/min. Continuous high syngas yield and carbon conversion were observed during the cyclic redox tests.

Regio- and enantioselective ring-opening reaction of vinylcyclopropanes with indoles under cooperative catalysis

Abstract: The title reaction has been established under the cooperative bimetallic catalysis of iridium and copper catalysts, which afforded indole C3-allylation products with branched selectivity in moderate yields (up to 78%) and good enantioselectivities (up to 97 : 3 er). This reaction not only represents the first catalytic asymmetric ring-opening reaction of vinylcyclopropanes with C3-unsubstituted indoles, but also has provided an atom-economic and straightforward method for the synthesis of C3-allylic indoles with high regio- and enantioselectivity.

filtering for stochastic systems driven by Poisson processes

Abstract: This paper investigates the filtering problem for stochastic systems driven by Poisson processes. By utilising the martingale theory such as the predictable projection operator and the dual predictable projection operator, this paper transforms the expectation of stochastic integral with respect to the Poisson process into the expectation of Lebesgue integral. Then, based on this, this paper designs an filter such that the filtering error system is mean-square asymptotically stable and satisfies a prescribed performance level. Finally, a simulation example is given to illustrate the effectiveness of the proposed filtering scheme.

Carbon emission effect of urbanization at regional level: empirical evidence from China

Abstract: Historically, global urbanization has been an essential ingredient for national economic growth and beneficial social transformation. However, with the global urban population currently generating two-thirds of all carbon emissions, global policymakers are urging mayors and regional leaders to make difficult decisions to reduce the negative impacts of urbanization on the environment. The authors begin their examination of the implications of local and regional factors by applying the Dynamic Spatial Durbin Panel Data Model to empirically examine aspects of developing low-carbon strategies for the rapidly expanding size and number of the world's urban areas. The results indicate that the contribution of urbanization to carbon emissions can be positively affected when regional policy makers collaborate to focus on spillover effects to simultaneously manage the scope, diversity, and complexity of economic and environmental issues from the perspective of creating a balance between rapid urbanization and relevant regional factors. Regional leaders can make a difference by creating both short-term goals and long-term strategies for maintaining low-carbon urbanization, nurturing regional coordination, monitoring and managing eco-friendly regional spillover effects, supporting low-carbon technology innovations, and maintaining optimal city size.