Accretion onto a Kiselev black hole

We consider accretion onto a Kiselev black hole. We obtain the fundamental equations for accretion without the back-reaction. We determine the general analytic expressions for the critical points and the mass accretion rate and find the physical conditions the critical points should fulfill. The case of polytropic gas are discussed in detail. It turns out that the quintessence parameter plays an important role in the accretion process.Comment: 7 page

Auction-style cooperative medium access control

A cooperative Medium Access Control (MAC) protocol employing auction-style relay selection combined with superposition coding is designed. In our proposed scheme, the source achieves its target throughput with the aid of cooperation. The potential candidate relays carry out autonomous decisions concerning whether to contend for a transmission opportunity to convey their traffic in the light of their individual energy requirements. Simulation results demonstrate that our scheme is capable of providing both considerable energy savings, as well as substantial throughput improvements for both the source and the relay in a ’win-win’ cooperation regime

Cooperative medium access control based on spectrum leasing

Based on cooperative spectrum leasing, a distributed “win–win” (WW) cooperative framework is designed to encourage the licensed source node (SN) to lease some part of its spectral resources to the unlicensed relay node (RN) for the sake of simultaneously improving the SN’s achievable rate and for reducing the energy consumption (EC). The potential candidate RNs carry out autonomous decisions concerning whether to contend for a cooperative transmission opportunity, which could dissipate some of their battery power, while conveying their traffic in light of their individual service requirements. Furthermore, a WW cooperative medium-access-control (MAC) protocol is designed to implement the proposed distributed WW cooperative framework. Simulation results demonstrate that our WW cooperative MAC protocol is capable of providing both substantial rate improvements and considerable energy savings for the cooperative spectrum leasing system

Analysis on the Construction Path of “Golden Course” of International Commercial Law in International Trade Major from the New Liberal Arts Perspective

Under the background of “new liberal arts”, curriculum innovation and development become an important way to improve the quality of talent training. Therefore, the construction of “golden course” as a breakthrough is the focus of talent training and professional development in undergraduate colleges. Based on the analysis of the necessity of constructing the “golden course” of International Commercial Law in international trade major from the perspective of new liberal arts and the existing problems in course construction, this paper constructs the “five-in-one” teaching mode of “Golden Course” of International Commercial Law in international trade major by combining the teaching idea of “pre-class + after-class + in-class”, and explores the cultivation path of foreign trade law compound talents. To cultivate high-quality practical foreign trade talents who meet the needs of the construction of a trade power and the development of the country and society