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Cross-Technology Interference affects the operation of low-power ZigBee networks, especially under severe WiFi interference. Accurate corruption estimation is very important to improve the resilience of ZigBee transmissions. However, there are many limitations in existing approaches such as low accuracy, high overhead, and requiring hardware modification. In this paper, we propose an accurate corruption...
Wireless Rechargeable Sensor Networks (WRSNs) have attracted increasing research attention in recent years. In WRSNs, a mobile charger is often used to charge the network nodes. To reduce the charging delay, the existing works often formulate the problem as a Traveling Salesman Problem (TSP), where the charger is required to visit the specific positions of the network nodes due to the limited charging...
Field emission of graphene is usually limited by the surface morphology because the existing deposition methods lead to graphene flakes that lay flat on the substrate. To overcome this problem, we synthesized polypyrrole(PPy)-graphene composites by electrochemical deposition method. The graphene flakes are oriented at some angles on the PPy surface, leading to good field emission performance. This...
Co-doped ZnO thin films fabricated by nanocluster-beam technique were annealed at 200, 400 and 700°C and the influence of temperature has been investigated. AFM images and UV absorbance spectra were carried out. Co-doped ZnO exhibited ferromagnetic at room temperature, and the saturation magnetization of films was also studied following the changing of annealing temperatures.
ZnO thin films were prepared by reactive DC magnetron sputtering under different working pressures. ZnO thin films prepared at 40% O2 content in the mixed gases under the working pressure of 1.2 Pa exhibited excellent properties, such as high transmittance, high band-gap energy (3.27 eV), and good crystallinity with c-axis preferred orientation, which are benefit for the preparation of ZnO thin film...
HfO2/SiO2 multilayer coatings are usually applied to precise optical instruments and large optical systems. An equivalent reference temperature (ERT) technique had been proposed and used to model and evaluate the intrinsic strains of layered structures. This study has used finite element method and the equivalent reference temperature (ERT) technique to simulate the residual stress in HfO2/SiO2 multilayer...
ZnO thin films were prepared by reactive DC magnetron sputtering under different growth time. It was found that the ZnO thin films prepared at the sputtering time about 10 minutes exhibited excellent properties, such as high transmittance, high band-gap energy (3.25 eV), and good crystallinity with c-axis preferred orientation, which are benefit for the preparation of ZnO-based thin film transistors.
Co-doped ZnO thin films were fabricated by nanocluster-beam technique with different flow rates of helium gas at 200, 100 and 50 sccm and its influence of different flow rates on the properties has been investigated. TEM and AFM images, XPS survey scan and UV absorbance spectra were carried out. Co-doped ZnO exhibited ferromagnetic at room temperature, and the saturation magnetization of films reduced...
Wireless link correlation can greatly affect the performance of wireless protocols such as flooding, and opportunistic routing. Researchers have proposed a variety of approaches to optimize existing protocols exploiting link correlation. Most existing works directly measure link correlation using packet-level transmissions and receptions. Measurement alone is insufficient because it lacks predictive...
A series of experiments for ZnO thin films were made by reactive DC magnetron sputtering different oxygen content in mixed gases. ZnO thin films prepared at 40% O2 content exhibited excellent properties, such as high transmittance, high band-gap energy. These features are benefit for the preparation of ZnO thin film transistors.
Bulk data dissemination is a basic building block for enabling software update and reprogramming in wireless sensor networks. The recent structure based approach looks promising for efficient dissemination since it facilitates transmission and sleep scheduling. However, a number of limitations exist in existing structured protocols. In this paper, we propose a correlated core based solution for efficient...
The growth of graphite film on copper foil by plasma enhanced chemical vapor deposition was achieved at the temperature as relatively low as 800Π. The obtained sample was characterized by SEM and Raman spectra. The results show that the transparent continuous graphite film can be obtained by PECVD.
The quality and yield of the products in the process of hot rolling is affected seriously by slipping phenomenon. In order to solve the phenomenon in aluminum hot rolling, on the basis of considering various factors which lead to slip, the concept of hot rolling slip factor is proposed, and a multi-objective function with equal power margin and preventing the slip phenomenon is established, and the...
ZnO/CNTs composites were used to fabricate the field emission layer onto electrode by screen printing process. Through adding a graphene resistive layer between the electrode and the emission layer, the turn-on field was decreased from 1.6 v/μm to 1.0 v/μm; the emission uniformity and the emission stability were improved apparently.
In the present paper, the field emission properties of mixture of carbon nanotubes, ZnO tetrapods and conductive particles is discussed. To improve the field-emission further, a field-emission cathode with special edge structure is proposed in this paper. In Figure 1, the silver cathode electrode is first coated on a glass substrate. Then, carbon nanotubes are deposited on the cathode electrode as...
Carbon nanotubes (CNTs) have excellent performance in field emission [1-3]; they can be used as field emission (FE) cold cathodes. The traditional FE cold cathode is difficult to apply to the microwave electronic devices. In this paper, we used thermal chemical vapor deposition to synthesize CNTs directly on the surface of traditional thermal-cathode by self-heated. The result proved that the field...
Carbon nanotubes (CNTs) have attracted considerable attention due to their unique structure, remarkable properties, and their potential for a variety of applications, since their discovery by Iijima in 1991.The nanotube's high field enhancement, high aspect ratios, small tip radii of curvature and high current density make it a nearly ideal electron source for field emission. This paper discusses...
This paper presents a wavelet-based image fusion method, in which the self-organizing particle swarm optimization algorithm is applied to image fusion based on region energy. In order to find image fusion by the optimal threshold particles are firsthand formed by thresholds. With comprehensive consideration of the parameters that affect the performance the algorithm, acceleration factors and inertia...
Cytochrome P450 4F3 (CYP4F3) catalyzes the inactivation of leukotriene B4 by ω-oxidation in human neutrophils. Here, we examined the mRNA and protein expression of the CYP4F3 in HL-60 cells, an acute promyelocytic leukemia cell line, in the presence of hydroquinone(HQ). We found hydroquinone led to a decrease in cell proliferation and a increase in cell apoptosis in a dose-dependent and time-dependent...
This paper introduces the operating principle of pulse-width phase-shift (PW-PS) control technique. Its characteristics and applications in series-resonant high frequency induction heating power supply are researched. The relationship between the devices dissipation and phase-shift angle is analyzed theoretically. All the conclusions are verified and the SOA of power devices is obtained based on MATLAB...
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