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Effects of Rhenium on Creep Rupture Life of a Single Crystal Superalloys

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Journal of Materials Science & Technology 1999年第1期15卷 53-57页

作者： Li, Jiarong Tang, Dingzhong lao, Riling Liu, Shizhong Wu, Zhongtang Inst Aeronaut Mat Beijing 100095 Peoples R China

The slabs of a single crystal superalloy were poured with 2.2%Re, 3.2%Re and 4.2%Re and other element contents of the alloys were basically kept unchanged. The effects of Re on the ultimate tensile strength, creep rupture life and rafting of a single crystal superalloy were studied. The results show that with increasing Re content the ultimate tensile strength decreases but the plasticity increases at 982 degree C/248.2 MPa, 1038 degree C/206.8 MPa and 1070 degree C/176.8 MPa for the alloy; on the microstructure aspect, with increasing the creep rupture life of the alloy the rafting is getting bigger and bigger at the same test condition, and the rafting suppresses creep and increases creep rupture life in the single crystal superalloy. (Edited author abstract) 11 Refs.

关键词： Superalloys

High temperature creep property of silicon particles reinforced high Al Zn based alloys

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中国有色金属学会会刊：英文版 1999年第3期9卷 519-523页

作者： Zhang Liming(张利明) Ding Zhimin(丁志敏) lao Bin(劳彬) Dalian Univ Technol Dept Mat Engn Dalian 116028 Peoples R China

The deformation creep characteristics of as cast silicon particles reinforced zinc based alloys (Si/ZA27) were determined by high temperature creep experiments at 453 K and 61.1 MPa condition. The experimental results indicated that the minimum creep rate of the silicon containing alloys are about three fifth of that of the matrix alloy(ZA27). The deformation process is mainly controlled by grain boundary sliding mechanism. Both dislocation climb and disperse silicon phase are also contributed to it. Micro structural changes were investigated during the deformation experiments.

关键词： particle reinforcing ZA27 creep property

Impact of Wavelength-Routed Network Physical Topology on Blocking Probability Using a Dynamic Traffic Growth Model

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光学学报 2003年第S1期23卷 773-774页

作者： Roger lao Robert Killey Department of Electronic and Electrical Engineering University College London Torrington Place London WC1E 7JE U.K.Department of Electronic and Electrical Engineering University College London Torrington Place London WC1E 7JE U.K.

We investigate the impact of network topology on blocking probability in wavelength-routed networks using a dynamic traffic growth model. The dependence of blocking on different physical parameters is assessed.

关键词： of be as Impact of Wavelength-Routed Network Physical Topology on Blocking Probability Using a Dynamic Traffic Growth Model were on

Oscillatory stability of quantum droplets in PT-symmetric optical lattice

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Communications in Theoretical Physics 2021年第6期73卷 59-65页

作者： Jiehong lao Zheng Zhou Xili Zhang Fuqiu Ye Honghua Zhong Department of Physics and Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education Hunan Normal UniversityChangsha 410081China Department of Physics Hunan Institute of TechnologyHengyang 421002China Department of Physics Jishou UniversityJishou 416000China Institute of Mathematics and Physics Central South University of Forestry and TechnologyChangsha 410004China

We study stability and collisions of quantum droplets(QDs)forming in a binary bosonic condensate trapped in parity-time(PT)-symmetric optical *** is found that the stability of QDs in the PT-symmetric system depends strongly on the values of the imaginary part W0 of the PT-symmetric optical lattices,self-repulsion strength g,and the condensate norm *** expected,the PT-symmetric QDs are entirely unstable in the broken PT-symmetric ***,the PT-symmetric QDs exhibit oscillatory stability with the increase of N and g in the unbroken PT-symmetric ***,collisions between PT-symmetric QDs are *** collisions of droplets with unequal norms are completely different from that in free ***,a stable PT-symmetric QDs collides with an unstable ones tend to merge into breathers after the collision.

关键词： quantum droplets PT symmetry optical lattice

Transmission dynamics and control strategies assessment of avian influenza A(H5N6)in the Philippines

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Infectious Disease Modelling 2018年第1期3卷 35-59页

作者： Hanl Lee Angelyn lao Mathematics&Statistics Department De La Salle University2401 Taft Avenue0922 ManilaPhilippines Mathematical&Statistical Modeling Research Unit Center for Natural Sciences and Environmental Research2401 Taft Avenue0922 ManilaPhilippines

Due to the outbreaks of Highly Pathogenic Avian Influenza A(HPAI)H5N6 in the Philippines(particularly in Pampanga and Nueva Ecija)in August 2017,there has been an increase in the need to cull the domestic birds to control the spread of the ***,this control method poses a negative impact on the poultry *** addition,the pathogenicity and transmissibility of the H5N6 in both the birds and the humans remain largely unknown which call for the necessity to develop more strategic control methods for the *** this study,we constructed a mathematical model for the bilinear and half-saturated incidence to compare their corresponding effect on transmission dynamics of *** simulations of half-saturated incidence model were similar to what occurred during the H5N6 outbreak(2017)in the *** of culling the birds,we implemented other control strategies such as non-medicinal(personal protection and poultry isolation)and medicinal(poultry vaccination)ways to prevent,reduce,and control the rate of the H5N6 virus *** the proposed control strategies,we have shown that the poultry isolation strategy is still the most effective in reducing the infected birds.

关键词： Avian influenza Half-saturated incidence Personal protection Isolation Vaccination Philippines

Proteomic analysis of trans-hemispheric motor cortex reorganization following contralateral C7 nerve transfer

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Neural Regeneration Research 2018年第2期13卷 331-339页

作者： Yin Yuan Xiu-yue Xu Jie lao Xin Zhao Department of Hand Surgery Huashan HospitalFudan UniversityShanghaiChina Key Laboratory of Hand Reconstruction Ministry of HealthShanghaiChina Shanghai Key Laboratory of Peripheral Nerve&Microsurgery ShanghaiChina

Nerve transfer is the most common treatment for total brachial plexus avulsion injury. After nerve transfer, the movement of the injured limb may be activated by certain movements of the healthy limb at the early stage of recovery, i.e., trans-hemispheric reorganization. Pre- vious studies have focused on functional magnetic resonance imaging and changes in brain-derived neurotrophic factor and growth asso- ciated protein 43, but there have been no proteomics studies. In this study, we designed a rat model of total brachial plexus avulsion injury involving contralateral C7 nerve transfer. Isobaric tags for relative and absolute quantitation and western blot assay were then used to screen differentially expressed proteins in bilateral motor cortices. We found that most differentially expressed proteins in both cortices of upper limb were associated with nervous system development and function （including neuron differentiation and development, axonogenesis, and guidance）, microtubule and cytoskeleton organization, synapse plasticity, and transmission of nerve impulses. Two key differentially expressed proteins, neurofilament light （NFL） and Thy-1, were identified. In contralateral cortex, the NFL level was upregulated 2 weeks after transfer and downregulated at 1 and 5 months. The Thy-1 level was upregulated from 1 to 5 months. In the affected cortex, the NFL level increased gradually from 1 to 5 months. Western blot results of key differentially expressed proteins were consistent with the proteom- ic findings. These results indicate that NFL and Thy-1 play an important role in trans-hemispheric organization following total brachial plexus root avulsion and contralateral C7 nerve transfer.

关键词： nerve regeneration brachial plexus brain plasticity contralateral C,q cortex reorganization isobaric tags for relative and absolute quantitation proteomics nerve transfer neurofilament light Thy-1 neural regeneration

Mechanisms of granular activated carbon anaerobic fluidized-bed process for treating phenols wastewater

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Journal of Environmental Sciences 2002年第1期14卷 132-135页

作者： lao Shan gen (Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China) Department of Environmental Engineering Zhejiang University Hangzhou 310029

Granular activated carbon (GAC) anaerobic fluidized bed reactor was applied to treating phenols wastewater. When influent phenol concentration was 1000 mg/L, volume loadings of phenol and COD Cr were 0 39 kg/(m 3·d) and 0 98 kg/(m 3·d), their removal rates were 99 9% and 96 4% respectively. From analyzing above results, the main mechanisms of the process are that through fluidizing GAC, its adsorption is combined with biodegradation, both activities are brought into full play, and phenol in wastewater is effectively decomposed. Meanwhile problems concerning gas liquid separation and medium plugging are well solved.

关键词： granular activated carbon (GAC) anaerobic fluidized bed phenol removal rate

A deep multimodal fusion and multitasking trajectory prediction model for typhoon trajectory prediction to reduce flight scheduling cancellation

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Journal of Systems Engineering and Electronics 2024年第3期35卷 666-678页

作者： TANG Jun QIN Wanting PAN Qingtao lao Songyang College of Systems Engineering National University of Defense TechnologyChangsha 410000China

Natural events have had a significant impact on overall flight activity,and the aviation industry plays a vital role in helping society cope with the impact of these *** one of the most impactful weather typhoon seasons appears and continues,airlines operating in threatened areas and passengers having travel plans during this time period will pay close attention to the development of tropical *** paper proposes a deep multimodal fusion and multitasking trajectory prediction model that can improve the reliability of typhoon trajectory prediction and reduce the quantity of flight scheduling *** deep multimodal fusion module is formed by deep fusion of the feature output by multiple submodal fusion modules,and the multitask generation module uses longitude and latitude as two related tasks for simultaneous *** more dependable data accuracy,problems can be analysed rapidly and more efficiently,enabling better decision-making with a proactive versus reactive *** multiple modalities coexist,features can be extracted from them simultaneously to supplement each other’s *** actual case study,the typhoon Lichma that swept China in 2019,has demonstrated that the algorithm can effectively reduce the number of unnecessary flight cancellations compared to existing flight scheduling and assist the new generation of flight scheduling systems under extreme weather.

关键词： flight scheduling optimization deep multimodal fusion multitasking trajectory prediction typhoon weather flight cancellation prediction reliability

The Change of the Inlet Geometry of a Centrifugal Compressor Stage and its Influence on the Compressor Performance

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Journal of Thermal Science 2013年第3期22卷 197-208页

作者： WANG Leilei YANG Ce ZHAO Ben lao Dazhong MA Chaochen LI Du School of Mechanical Engineering Beijing Institute of Technology

The impact on the compressor performance is important for designing the inlet pipe of the centrifugal compressor of a vehicle turbocharger with different inlet pipes. First, an experiment was performed to determine the compressor performance from three cases: a straight inlet pipe, a long bent inlet pipe and a short bent inlet pipe. Next, dynamic sensors were installed in key positions to collect the sign of the unsteady pressure of the centrifugal compressor. Combined with the results of numerical simulations, the total pressure distortion in the pipes, the pressure distributions on the blades and the pressure variability in the diffuser are studied in detail. The results can be summarized as follows: a bent pipe results in an inlet distortion to the compressor, which leads to performance degradation, and the effect is more apparent as the mass flow rate increases. The distortion induced by the bent inlet is not only influenced by the distance between the outlet of the bent section and the leading edge of the impeller but also by the impeller rotation. The flow fields in the centrifugal impeller and the diffuser are influenced by a coupling effect produced by the upstream inlet distortion and the downstream blocking effect from the volute tongue. If the inlet geometry is changed, the distributions and the fluctuation intensities of the static pressure on the main blade surface of the centrifugal impeller and in the diffuser are changed accordingly.

关键词： centrifugal compressor inlet pipe distortion main blade diffuser