Aiming at the problem of joins query in MANET, we proposed a grouping cache mechanism, which builds grouping cache considering the features of data. The proposed mechanism can implement the cooperating cache between g...
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This paper proposes a multi-channel MAC protocol, CDS, for WSNs to tackle the collision incurred by channel selection. By using collision detection, when the collision occurs, a receiver can timely detect it and notif...
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Strongly coupled heat, species mass and momentum transport behaviors in melting processes of a 2D blade-like casting of Al-4.5Cu%wt and pseudo-binary γ(TiAl)-55Al%at alloys were numerically simulated using a continuu...
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Approximate computing (AC) is an attractive energy efficient technique that can be implemented at almost all the design levels including data, algorithm, and hardware. The basic idea behind AC is to deliberately contr...
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The non-linear dynamic characteristics of a flexible rotor supported by externally pressurized hybrid gas bearings are studied in this article. The rotor dynamic equations for the rotor are solved by the Newmark integ...
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The non-linear dynamic characteristics of a flexible rotor supported by externally pressurized hybrid gas bearings are studied in this article. The rotor dynamic equations for the rotor are solved by the Newmark integral method and the gas-lubricated Reynolds equation by the alternating direction implicit method. The multifield coupling algorithm based on the forecasting method is proposed and applied in this article to solve the fluid-structure interaction problem. Also, the non-linear dynamic parameter identification method based on the forecasting orbit method is investigated. It is indicated that the dynamic characteristics of externally pressurized hybrid gas-bearing rotor system and whirling instability of the system reveal the complex behaviour, which could be depicted comprehensively. This would establish the foundation for contributing to a further understanding of the hybrid gas-bearing flexible rotor system.
Creep is an important characteristic of bamboo and wood materials under long-term *** paper aims to study the long-term bending beha-viour of prestressed glulam bamboo-wood beam(GBWB).For this,14 pre-stressed GBWBs we...
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Creep is an important characteristic of bamboo and wood materials under long-term *** paper aims to study the long-term bending beha-viour of prestressed glulam bamboo-wood beam(GBWB).For this,14 pre-stressed GBWBs were selected and subjected to a long-term loading test for 60 ***,a comparative analysis was performed for the effects of pre-tension values,the number of pre-stressed wires,and long-term load on the stress variation of the steel wire and the long-term deflection of the beam *** test results showed that with the number of prestressed wires increasing,the total stress of the steel wire in the beam midspan and the ratio of the long-term deflec-tion to the total deflection decreases decreased,but when the number of steel wires exceeded 4,the total stress and long-term deflection was less infuenced;with the pre-tension value increasing,the ratio of the total stress of the steel wire in the beam midspan and the ratio of the long-temm deflection to the total deflec-tion also decreased,but when the prestress force was greater than 3.975 kN,the:total stress and long-term deflection were less affected;with the other parameters unchanged,when the value of the long-term load increased,the total stress of the steel wire decreased,and the long-temm deflection of the beam midspan increased,which shall be more significant with the long-term load greater than 30%of the standard ultimate bearing *** the test,the experimental data were fitted,and the creep coefficient was ***,the long-term stiffness calcula-tion fommula of the pre-stressed GBWB based on creep effect was *** research findings have certain theoretical significance and engineering value.
Mobile Virtual Private Network (MVPN) technology is already widely used for secure connections between two endpoints. However, most existing MVPNs are designed as an optimized and parallel transplantation of tradition...
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Image classifiers have been proven to be easily fooled by perturbations, but it is still exceedingly challenging to generate imperceptible disturbances, especially without the internal knowledge of the classifiers. Im...
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Currently, the knowledge management system (KMS) is used by many enterprises. However, the most studies focus on the details of technology, instead of management mode. In this paper, aiming at the existing problem in ...
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An alloyed cast iron was prepared by horizontal continuous *** study the salt bath temperature on microstructure and mechanical properties,the alloyed cast iron was firstly austenitized at 950℃for 3 h and then austem...
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An alloyed cast iron was prepared by horizontal continuous *** study the salt bath temperature on microstructure and mechanical properties,the alloyed cast iron was firstly austenitized at 950℃for 3 h and then austempered in salt bath at various temperatures(250℃,300℃and 350℃)for another 3 *** scanning electron microscopy(SEM),electron backscattered diffraction(EBSD),and X-ray diffraction(XRD)were employed to observe the microstructure and test the mechanical properties of the alloyed cast *** show that the microstructure of the alloyed cast iron is mainly composed of acicular or feathery ferrite(bainite),retained austenite,carbide,and *** austempered in salt bath at 250℃,300℃and 350℃for 3 h,the volume fractions of retained austenite are 33.1%,41.7%,and 57.2%,the thickness of acicular ferrite are 0.25μm,0.3μm,and 0.8μ*** the salt bath austempering temperature increases,the mechanical properties decrease due to the increase of the volume fraction of retained austenite and the thickness of acicular *** highest tensile strength of the alloyed cast iron is achieved when it is austempered at 250℃in a salt *** these conditions,the tensile strength of the alloyed cast iron can reach 1,429 *** test results indicate that the fracture mechanism is predominantly brittle fracture.
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