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Machine-type communication (MTC) that usually involves a huge number of devices performing small data transmissions introduces serious challenges for mobile communication networks. Through aggregating MTC devices with identical or similar traffic characteristics into a paging group and paging the devices in the group simultaneously by a single paging, group paging can largely reduce the paging traffic...
Aim at enhancing dexterous and safe operation in unstructured environment, a cable-driven soft robotic manipulator is designed in this paper. Due to soft material it made of and nearly infinite degree of freedom it owns, the soft robotic manipulator has higher security and dexterity than traditional rigid-link manipulator, which make it suitable to perform tasks in complex environments that is narrow,...
Wind energy is a renewable energy without pollution in the nature world. Researchers dedicate to improve wind energy utilization of vertical axis wind turbine (VAWT). A new type of wind rotor named fish-ridged rotor is proposed based on bionic simulation of swimming fish. Geometric structure of the rotor is designed and analyzed. Wind tunnel tests are carried out to study performance of the rotor...
The wind permanent-magnet generator experimental platform will be developed which drives directly through three phase asynchronous motor. The system hardware is mainly composed of the three phase power supply unit, the inverter, three phase asynchronous motor, External rotor permanent generator, three phase resistive load, the torque and rotational speed sensor, data collector with the USB interface,...
Wind tunnel test is one of the important methods to research the characteristics of vertical axis wind turbine (VAWT). To improve the test performance, intelligent test equipment for VAWTs is developed. The whole equipment is divided into three subsystem: support and adjustment, intelligent data-acquisition and analysis and loading system, each of them is analyzed and designed. An intelligent test...
Solid-state nanopores have emerged as useful single-molecule sensors for DNA and proteins. Dry-oxygen oxidation was proposed to directly shrink pyramidal silicon (Si) pore arrays. With this method, inverted-pyramid Si nanopore arrays with feature sizes of over 60 nm, prepared using a combination of dry and wet etching, were shrunk to be less than 20 nm with nanometer precision. The shrinkage was found...
In this paper, nonlinear dynamical characteristics of 1550nm vertical-cavity surface emitting lasers (VCSELs) subject to positive optoelectronic feedback (POEF) or polarization-preserved optical feedback (PPOF) are experimentally investigated. For the case of POEF, various nonlinear dynamical behaviors including regular pulsing (RP), quasiperiodic pulsing (QP), chaotic pulsing (CP) and mode locking...
The evolution of cellular wireless communications has involved the introduction of technologies such as multiple antennas, OFDM, higher spectral efficiency through better modulation, denser deployments and carrier aggregation. A different approach to enhancing the cellular network by using direct communication between UEs is presented in this paper. Direct device-to-device (D2D) communication can...
The insulation of the multi-loop AC-DC transmission lines with the same tower has been more concerned as the erect of which meets the needs of resource- saving society. The paper analyzed the contamination characteristics and polluted external insulation design of the multi-loop AC-DC transmission lines based on dirt retention data, which obtained from natural pollution deposit contamination tests,...
In this paper, an alternative multi-stage self-preheating burner is presented and initial analyzed through Computational Fluid Dynamics (CFD). The chief advantages of the present design are to create a high temperature inlet air without using other auxiliary heating devices and a high speed jet in the furnace. Details of the flow field, flow velocity, temperature are provided and flue gas recirculation...
This paper describes a comprehensive system architecture that enables mobile-to-mobile communications for the purpose of enhancing the capacity of the cellular network. The architecture is developed using LTE Release-10 as the baseline. The impact on the protocol stack is discussed in detail. Neighbor discovery mechanisms are described to enable users to identify potential helper mobiles to enable...
Chengdu was the birthplace of “Nongjiale”,which is a kind of rural tourism. Longquan moutain is one of the famous districts for “Nongjiale” in Chengdu,but which is becoming less attractive especially after the success of Sansheng Town. Hongsha village was the first place to become the rural tourism destination in Sansheng Town. Now Chengdu sets up “World-class Modern Garden City” as its global orientation...
Changes in the frond physiology and ultrastructure of Pteris multifida Poir. were investigated under greenhouse conditions in response to application of arsenic (As) and lead (Pb). Various levels of As and Pb (0, As300Pb500, As600Pb1000 and As900Pb1500 mg kg−1) were applied to the plants. An increasing As and Pb level, as well as a higher duration significantly inhibited plant growth and decreased...
As a renewable energy, wind energy has attracted great attention all over the world. To study the aerodynamic performance of new vertical axis wind energy conversion systems, a type of simple straight-flow wind tunnel test equipment for vertical axis wind turbines has been developed. The performance of the power section, diffusing section, rectification section and the contraction section of the wind...
Temperature stability based on high Ge-doped fibre Bragg grating (FBG) is presented. A high Ge-doped photosensitive fibre (PSF) used for writing FBG was manufactured. Temperature characteristic of the FBG from 20 to 300°C had been researched. The transmission efficiency is about 75% at 300°C.
Under the e-maintenance pattern, knowledge share among the members of equipment maintenance alliance is very important. In order to manage the knowledge of equipment maintenance alliance effectively, the knowledgement structure and its characteristics were analyzed. On the basis of the process of equipment maintenance knowledge analyze, the cooperative maintenance of equipment network and knowledge...
We study the wetting energetics and wetting hysteresis of sessile and impacting water droplets on superhydrophobic surfaces as a function of surface texture and surface energy. For sessile drops, we find three wetting regimes on these surfaces: equilibrium Cassie at small feature spacing, equilibrium Wenzel at large feature spacing, and an intermediate state at medium feature spacing. We observe minimum...
Heterogeneous nucleation of water plays an important role in wide range of natural and industrial processes. Though heterogeneous nucleation of water is ubiquitous and everyday experience, spatial control of this important phenomenon is extremely difficult. Here we show, for the first time, that spatial control in the heterogeneous nucleation of water can be achieved by manipulating the local nucleation...
As power densities in electronic devices have increased dramatically over the last decade, advanced thermal management solutions are required. A significant part of the thermal resistance budget is commonly taken up by the heat spreader, which serves to reduce the input heat flux and connect to an increased area for heat removal. Thermal ground planes are devices that address this issue by utilizing...
The study on content-based spam filtering is one of the important topics in the Internet security research area. And Bayesian classification method has expressed better performance on anti-spam. An improved new method that classifies spam filtering based on Bayesian filtering is proposed in this paper. The experiment results show that the new method has improved spam recall and spam precision.
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