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In this work, a novel graphene oxide–silica (GO–silica) composite coating was prepared for hollow fiber solid phase microextraction (HF-SPME) of trace Mn, Co, Ni, Cu, Cd and Pb followed by on-line inductively coupled plasma mass spectrometry (ICP-MS) detection. The structure of the prepared graphene oxide and GO–silica composite was studied and elucidated by atomic force microscopy (AFM), transmission...
A novel Fe 3 O 4 @SiO 2 @polyaniline–graphene oxide composite (MPANI-GO) was prepared through a simple noncovalent method and applied to magnetic solid phase extraction (MSPE) of trace rare earth elements (REEs) in tea leaves and environmental water samples followed by inductively coupled plasma mass spectrometry (ICP-MS) detection. The prepared MPANI-GO was characterized by...
Reducing server's bandwidth pressure is one of the key problems in the designing of peer-to-peer video-on-demand system. In this paper, we analysis and model this problem via using the “pseudo sequence scheduling”, which is widely used by many peer-to-peer video-on-demand systems. We reveal the relations between the server bandwidth consumption, the cache size and the join speed of peers. This result...
Data scheduling is the key issue in peer-to-peer streaming system, especially in peer-to-peer VoD system. This paper mainly focuses on data chunkspsila priority definition of data scheduling in peer-to-peer VoD system. After carefully studying the meanings of regular rarest first scheduling and random scheduling, a local-rarest-random-heurist (LR2H) scheduling is proposed in order to fully use the...
Selecting partner candidates for data transferring plays an important role in the P2P (peer-to-peer) media streaming system. Most traditional P2P media streaming systems do not consider the physical network among the peers, while selecting partner candidates according to physical network can reduce the latency of the data transferring and improve the quality of service. Aiming at objectives of P2P...
In this paper, we consider the existence of non-trivial solutions to semi-linear Brezis–Nirenberg type problems with Hardy potential and singular coefficients. First, we shall study the corresponding eigenvalue problem, and obtain some basic properties of eigenvalues and asymptotic estimates of the eigenfunctions and approximating eigenfunctions. Secondly, we consider the extremal functions of the...
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