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With the emergence of network virtualization, the infrastructure can be effectively integrated to overcome the "ossification" of the Internet. The biggest challenge in network virtualization is the problem of virtual network embedding. Unfortunately, most of the researches on virtual network embedding only focus on static algorithms, which allocate fixed or invariable resources to virtual...
A new device architecture of micro thermoelectric generator (μ-TEG) is proposed. The μ-TEG utilizes silicon nanowires as the thermoelectric (TE) material, and it can be fabricated by the CMOS-compatible process. It is driven by an “evanescent thermal field” exuding around a heat flow perpendicular to the substrate. We demonstrate experimentally that the TE power increases in the shorter TE leg lengths...
Piezoelectric atomizing device has extensive application in many fields and is beneficial to people's livelihood. The areas of aerospace, medical and health, energy saving have raised a high demand for atomizer. The relationship between geometric parameters of atomizer pores and particle size of atomized droplet is crucial that we haven't known yet. In this study, the author measured parameters of...
For the better performance of piezoelectricity actuated ultrasonic nebulizer, some factors, which may have effect on the performance, are analyzed. A conclusion that the change of the cone angle in the vibration of the nebulizer does some contribution to the performance is got. According to this fact, a concept “moving cone angle” is put forward. The working principle of “moving cone angle” is introduced,...
In this paper, a novel planar interconnection method with substrate integrated waveguide (SIW) is presented. This method can be used as planar microwave structure interconnection in millimeter wave band. It also provides a quick assembly and disassembly of interconnection with different modules without any soldering or wire bonding operations. A W-band SIW interconnection structure is simulated and...
This paper presents a cycle-based ammonia coverage ratio optimization for Diesel engine two-can selective catalyst reduction (SCR) systems. For a high NOx conversion, it is intuitively required that the ammonia coverage ratio for the first catalyst can is as high as possible. However, a high ammonia coverage ratio would increase the ammonia slip downstream. In order to constrain the ammonia slip downstream,...
The effect of the activators and surfactants in halogen-free fluxes on the wettability of Sn-0.7Cu-0.05Ni solder on Cu substrate (or under bump metallization, UBM) was investigated in this study. The spreading area of Sn-0.7Cu-0.05Ni solder on Cu substrate was used to estimate the wetting performance of the solder influenced by the activators with different amounts added in halogen-free fluxes. The...
Power electronics play an important role in electricity utilization from generation to end customers. Thus, high-efficiency power electronics help to save energy and conserve energy resources. Research on silicon carbide (SiC) power electronics has shown their better efficiency compared to Si power electronics due to the significant reduction in both conduction and switching losses. Combined with...
A compact and planar dual-antenna structure is reported which combines a printed monopole and a half-slot antenna to provide dual polarization. Different excited current modes are utilized to obtain low mutual coupling between elements. A prototype is fabricated and the measured results are presented. Relative bandwidth of 23.5% and isolation of better than 23 dB are achieved.
Measurement on dipole antenna with a light polarized nano-material(PNM) reflector has been carried out in this paper. Based on the PNM textile fabricated by Tsinghua-Foxconn Nanotechnology center, we set up a dipole antenna with a PNM reflector formed by 20 layers of carbon nanotube textile. To evaluate the performance of PNM reflector, we measured the radiation pattern of the antenna with PNM reflector...
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