Chemical Control for Host-Parasitoid Model within the Parasitism Season and Its Complex Dynamics

In the present paper, we develop a host-parasitoid model with Holling type II functional response function and chemical control, which can be applied at any time of each parasitism season or pest generation, and focus on addressing the importance of the timing of application pesticide during the parasitism season or pest generation in successful pest control. Firstly, the existence and stability of both the host and parasitoid populations extinction equilibrium and parasitoid-free equilibrium have been investigated. Secondly, the effects of key parameters on the threshold conditions have been discussed in more detail, which shows the importance of pesticide application times on the pest control. Thirdly, the complex dynamics including multiple attractors coexistence, chaotic behavior, and initial sensitivity have been studied by using numerical bifurcation analyses. Finally, the uncertainty and sensitivity of all the parameters on the solutions of both the host and parasitoid populations are investigated, which can help us to determine the key parameters in designing the pest control strategy. The present research can help us to further understand the importance of timings of pesticide application in the pest control and to improve the classical chemical control and to make management decisions

Digital Financial Inclusion and Sustainable Growth of Small and Micro Enterprises—Evidence Based on China’s New Third Board Market Listed Companies

The United Nations’ 2030 Agenda for Sustainable Development aims to promote inclusive and sustainable economic growth and encourage the formalization and growth of micro, small, and medium enterprises through access to financial services. This study examines the impact and mechanism of the digital financial inclusion on the sustainable growth of small and micro enterprises in China. For this purpose, it uses the data from China’s New Third Board Market listed companies from 2011 to 2018 and the digital financial inclusion index of Peking University. The results show that the development of digital financial inclusion helps promote the sustainable growth of small and micro businesses, particularly in private, high-tech industries, and competitive markets. The impact mechanism of this development prevents any financial crisis caused by the capital structure imbalance and capital liquidity problems of small and micro enterprises by alleviating the financing constraints, thus promoting their sustainable growth. The research results show that, under the background of high-quality development of China’s economy, continuous promotion of digital financial inclusion and reshaping of the ecological pattern of the financial industry can provide steady financial support for the sustainable growth of small and micro enterprises, and realize the healthy development of micro enterprises and macro economy

Green Credit Policy and Maturity Mismatch Risk in Polluting and Non-Polluting Companies

A major issue is whether the implementation of China’s green credit policy will affect the coordinated development of corporate sustainable operations and environmental protection. This paper used a propensity score matching—difference-in-differences (PSM-DID) model to analyse the impact of China’s green credit policy implemented in 2012 on the maturity mismatch risk between investment and financing in polluting and non-polluting companies. We found that: (1) green credit policies can help reduce the risk of maturity mismatch between investment and financing for polluting companies; (2) the reduction of short-term bank credit is the main way to curb the risk of maturity mismatch risk between investment and financing; (3) the green credit policy has no obvious mitigation effect on the risk of maturity mismatch between investment and financing among polluting companies with environmental protection investment; (4) the mitigation effect of the green credit policy on the maturity mismatch risk is more significant in state-owned polluting companies and polluting companies in areas with a lower level of financial development. The empirical results show that China’s green credit policy helps stimulate the environmental protection behaviour of companies, as well as helping alleviate the capital chain risk caused by the maturity mismatch between investment and financing. In addition, despite the effect of heterogeneity, it can solve the contradiction between environmental protection and economic development

The mechanical design and fabrication of 162.5 MHz buncher for China accelerator driven sub-critical system injector II

A buncher is one of the main pieces of equipment in the medium energy beam transport line (MEBT) for China accelerator driven sub-critical system (C-ADS) Injector II. To focus the beam longitudinally and match the beam for the acceptance of the superconducting linac section, two room temperature quarter wave resonator (QWR) bunchers with frequency of 162.5 MHz have been designed as parts of the MEBT. According to the beam transmission matching of the MEBT and the geometric parameters requirements of bunchers, the unique mechanical structure and the main processing technology of buncher cavities and their couplers and tuners are described in this paper. The fabrication of bunchers and their parts have been completed and tested at high power, the test results agree well with the design requirements. These bunchers work well for about two years in Institute of Modern Physics, Chinese Academy of Sciences