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Bi2Se3 nanoribbons and nanowires were synthesized by Au-catalyzed and catalyst-free chemical vapor deposition methods. The growth of Au-catalyzed Bi2Se3 nanoribbons and nanowires is governed by the vapor-solid-solid mechanism, and the nanoribbons grow along <1120> and the nanowires grow along <0001> directions. Catalyst-free grown Bi2Se3 nanoribbons are found to have a growth direction...
The influence of Co2O3 doped amount on dielectric and piezoelectric properties of (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 (BCZT) lead-free piezoelectric ceramics was studied by scanning electron microscope(SEM) and X-ray diffraction(XRD) and other analytical methods and conventional solid state method. TiO2 was chemically pure raw materials, other raw materials were analytical pure raw materials. The results...
The influence of calcined temperature and sintered technology on the properties of 0.85 (Na0.5Bi0.5) TiO3–0.144(K0.5Bi0.5)TiO3–0.006BaTiO3(NBT-KBT-BT) lead-free piezoelectric ceramics was investigated by conventional solid state method, and the relationship between calcined temperature, sintered technology and properties of NBT-KBT-BT lead-free piezoelectric ceramics was obtained. The influence of...
Based on the method of complex functions, the SH-wave scattered by a cavity with arbitrary shape in infinite anisotropic medium is investigated, and a far field solution of displacement is presented. As a result, the far field properties of the SH-wave scattered by circular, elliptical and square cavities in an anisotropic elastic medium with a symmetry plane are analyzed and some curves describing...
A method for maximize profit of greenhouse temperature control was proposed. Take lettuce planting as an example, a non-linear model was set up for forecasting plant growth rate by neural network, and a market price model was established for forecasting plant market price by Polynomial fitting function. In terms of the above two models and the cost of temperature adjustment based on energy balance,...
A fundamental challenge in service-oriented computing (SOC) is to select trustworthy Service. Existing approaches for service selection fail to capture the dynamic trust relationships between stranger services. Automatic trust negotiation (ATN)is a new approach to establish trust between strangers on the internet through the bilateral exchange of digital credentials. When a credential contains sensitive...
A Routing Algorithm base on Trustworthy Core Tree for WSN (RATCT) is proposed in this paper aims to prolong network lifetime as well as increase network security in a hierarchical-cluster sensor network. Cluster heads with higher residual energy and trust level are elected from underlying sensor nodes. A minimum energy consumption spanning tree algorithm is used to organize all cluster heads into...
In order to avoid the trust evaluation information appearing flooded in the evaluation process. This paper presents a trust evaluation matrix model based on cooperation and reputation. We has analyzed the indicator characteristic of the cooperation evaluation and the reputation evaluation separately, for the reputation, we adopt the dual semantics to carry on the information processing; for the cooperation...
Evolutionary games are widely studied in the fields of biology, physics, sociology, economics and informatics. People's interests focus on how to explain cooperation emerged in a population that individuals are selfish. Many researches reveal that some mechanisms contribute to the cooperation such that network structure, memory device and so on. This paper gives a new illustration to the phenomenon:...
Service discovery is the premise of service composition. The existing service discovery methods only consider individual service functions and static properties, less considering the inherent dependencies between the composite services. The data dependencies between services reveal the logic correlation between the composite services, but it is of great significance for the service composition and...
We report new novel ZnS nanostructures show superior field emission with a low turn-on field, high field-enhancement factor, large current density and high stability indicating the capability of the ZnS branched architecture as field emitters. This excellent field-emission property is attributed to its high crystallinity, single-phased and cone-shaped nanometer-sized tips. This study suggests that...
Summary form only given. In general, analytical solution for the scattering problem of SH plane wave by a cavity in half-space primarily focused on the circular structure case. However, the case for U-shaped cavities, which are similar to the cross-section of the tunnels, was seldom mentioned in former references. The analytical solution for U-shaped cavity in elastic half space is gained by the multi-polar...
It is a challenge that network coding achieve wide use in wireless mesh networks. Network coding must be compatible or friendly with TCP in practice. We propose a mechanism that naturally add network coding to current network systems. In our scheme, the destination feedback the degree of freedom of encoding block, and delays of packet delivery minimize reordering and timeouts. Using multipath routing,...
In watermarking applications, the robustness of the watermark to geometric manipulations is a critical issue. This is due to the fact that changing the image size or its orientation could make the receiver lost synchronization with original watermarked image. In this paper, a novel image watermarking scheme resisting geometrical attacks is proposed. We don't need to normalize the original image. The...
Designing high throughput wireless mesh networks is a challenge. Network coding has been shown to substantially improve throughput. According to the WMNs characteristic we study a multi-rate linear network coding for minimum-cost in wireless mesh networks and propose an scheme for efficient implementation . The scheme is in multi-rate codes which the source and intermediate nodes perform linear coding...
A trustworthy energy efficient routing algorithm (TEER) is proposed in this paper aims to distribute energy consumption across sensors evenly as well as increase path security in a hierarchical-cluster sensornet. In this paper, we model the cluster heads election using a game theoretic paradigm. The Nash equilibrium of our election game corresponds to the optimal healthier cluster heads having higher...
Through detailed analysis of energy consumption of wireless sensor network with uniform node distribution, it is proved that the assumption of network where the density of sensor nodes in the same circular ring is uniform can cause inaccurate analysis of energy consumption. A more accurate theoretically analytical method for avoiding energy hole is proposed for wireless sensor networks with non-uniform...
The multi-path routing strategy can delicately balance the energy consumption of wireless sensor networks to avoid the energy hole problem and prolong the lifetime of networks. In order to delicately plan a number of next-hop routing paths of each node, this paper proposes a multi-path energy hole avoidance routing algorithm that exploits the genetic algorithm (GA) to select numbers of next-hop nodes...
An important issue of routing is how to effectively balance the energy consumption of the entire network, and avoid the energy-hole which would lead to the premature death of the network. Based on the characteristics of wireless sensor network, this paper firstly converts the routing problem into linear programming problem, and proves the equivalence between the routing problem and linear programming...
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