Abstract For the integrity monitoring of a multi-source PNT (Positioning, Navigation, and Timing) resilient fusion navigation system, theoretical framework multi-level autonomous is proposed. According to mode navigation, adopts top-down logic structure establishes source fault detection model based on multi-combination separation residual method detect isolate at system level subsystem level. isolated non-redundant sources, recovery verification used. multi-redundant sensor optimized with...

Direction-controlled wetting surfaces, special for lubricating oil infused anisotropic have attracted great research interest in directional liquid collection, expelling, transfer, and separation. Nonetheless, there are still existing difficulties achieving continuous transport. Herein, we present a strategy to achieve transport on transparent elastomer film with V-shaped prisms microarray (VPM). The results reveal that the water direction parallel staggered arrangement of VPM structure...

Supersaturated carbon alloying layer was prepared on the surface of 15-5PH stainless steel using laser technology with powders as materials. XRD, optical microscope, scanning electron microhardness test and wear were performed to characterize microstructure resistance substrate layer. Results showed that rapidly solidified dendritic structure phase compositions high-carbon austenite a small amount martensite M7C3 carbides. Microhardness reached about 510 HV, which 38.7% higher than...

Decentralized approaches for Web services discovery, such as peer-to-peer, become more and attention - getting in the scientific community. In this paper, we propose a peer-to-peer framework, which adopts an enhanced skip graph named Servicelndex overlay network service discovery. To guarantee discovery efficiency, schemed WSDL-S (Web semantics) semantic description language extracted its attributes indexing keys graph. Also multi-layer P2P was constructed to aggregate similar keep load...

To improve the surface performance, precipitation hardening martensitic stainless steel 17-4PH is deposited with Co-based alloy stellite12 by plasma-transferred arc welding (PTAW). The microstructure and microhardness of fused line between base metal coating were characterized optical microscope (OM), scanning electron (SEM), transmission (TEM) hardness tester. results show that interface weld favorable without pore crack. composed martensite austenite, precipitates.

Centralized UDDI currently becomes harder to catch up with the need of Internet-scale service publishing and discovery. Peer-to-peer technology its advantages scalability, fault-tolerance dynamics is suitable for loose-coupled Web services' distribution in nature prevailing nowadays. In this paper, we present a distributed, collaborative peer-to-peer overlay discovery based on skip graph which could be organized by planar model or tree according scale services. We propose prefix-ordered...

Wall thickness eccentricity is a major dimensional deviation problem in seamless steel tube production. Although mainly caused by abnormal process conditions the cross-roll piercing mill, most plants lack monitoring at hot stage but only inspect quality of finished tubes using ultrasonic testing end all manufacturing processes. This paper develops an online technique to detect mill. Based on image-sensing technique, operation condition can be extracted from vibration signals. Optimal...

Pure magnesium and AZ31B alloy were irradiated by a high current pulsed electron beam (HCPEB) device with pulse times 10, 15 20 respectively. The microstructure changes of the surface modified layer after HCPEB treatment investigated, evolution temperature field during modification process was numerically simulated based on experimental theories. Numerical simulation analysis is close to results special morphology arising from interpreted.

In situ synthesized TiN and TiB reinforced metal matrix composite coating was fabricated on Ti-55511 by laser cladding with Ti-55511/BN powder mixture (2 wt-% BN). Results indicated that mainly composed of TiB, dendrite α phase. The diameter small-sized hollow tubular less than 400 nm, the width other rod-shaped 1 μm. flower-like structure formed during solidification consisted in centre or at edge. Coating had high hardness (540 HV) due to formation TiN. After direct aging (600°C/5 h/AC),...

In this paper, the microstructures and rolling contact fatigue behaviors of laser cladding Inconel 625 coatings with or without post-heat treatments were analyzed. The results revealed that resistance coating after any treatment was worse than as-deposited coating. First, through finite element analysis, distribution stress along thickness direction obtained, it concluded bonding interface between matrix had little effect on properties Then X-ray diffraction (XRD), scanning electron...

To reduce nuisance alarms caused by a fixed forward-looking boundary, this paper proposes resilient terrain avoidance method. The method constructed the and adjustable boundary model using roll angle navigation error, which makes data employed alert closer to overflown anticipated flight trajectory, reduces alarm, improves reliability of alert. Using real digital elevation maps simulated testing, proposed was observed provide alerting that is superior traditional technique.

Gas loss during transportation is an important technical and economic indicator in assessing the level of production costs benefits natural gas enterprises. As pipeline transmission trade continues to expand China, problems losses have become increasingly prominent. Take one joint-stock CNPC for example; total output about 24.2 billion cubic meters 2012, while amount has reached 60 million meters, which brings significant enterprise, so it necessary carry out study on trunk line. For a line...

The plasticity flow behavior of 2A12 aluminum alloy under a wide range temperatures ranging from 300°C to 450°C and strain rates 0.01s-1 1s-1 was studied by isothermal hot compression testing. plastic shows peak stress in curve. At the beginning stage deformation, increases with rapidly, then decreases showing softening characteristics. results show that rate hardening, while temperature heat softening. curve modeled novel function which consist an exponential linear term hardening...