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High-quality aluminum turbocharger impellers produced by thixocasting

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Transactions of Nonferrous Metals Society of China 2010年第9期20卷 1786-1791页

作者： G.WALLACE A.P.JACKSON S.P.MIDSON q.zhu Aluminum Complex Components Inc The Midson Group Inc. Cummins Turbo Techno logies

The thixocasting process was chosen to produce the impellers as it is capable of producing castings with extremely high internal *** cut from the DC cast bars are re-heated to the semi-solid casting temperature, and a specially-designed runner and gating system is used to prevent oxide from the surface of the slugs from becoming incorporated into the *** technology used to produce the semi-solid impellers is described in *** semi-solid cast impellers, produced from an Al-Si-Mg-Cu alloy, are heat treated to the T6 *** from testing are presented demonstrating that the impellers are free of porosity and other internal *** mechanical property and fatigue data are presented showing that the semi-solid impellers have better properties than impellers produced by conventional casting and similar properties to forged and machined impellers.A short study is also described which identified suitable processing parameters to minimize hot tearing in the complex-shaped turbocharger impellers semi-solid cast from alloy *** surfaces of the impellers were examined using penetrant testing, and the results of modifying processing parameters on the propensity for surface cracking are *** aging study was performed to identify optimum mechanical strength.

关键词： semi-solid casting turbocharger impeller fatigue properties alloy 201

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复发-缓解型多发性硬化的U形纤维扩散峰度和磁化率特征可能与认知障碍和神经退行性变有关

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国际医学放射学杂志 2024年第3期 371-371页

作者： D.Luo Y.Peng q.zhu q.Zheng q.Luo Y.Han 黄世豪

摘要目的评价复发-缓解型多发性硬化病人（pwRRMS）U形纤维区的扩散峰度和磁化率的变化及其与认知状态和退行性变的相关性。方法比较49例pwRRMS病人和

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High response and selectivity methanol gas sensor using molecular imprinting technique

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High response and selectivity methanol gas sensor using mole...

2014中国功能材料科技与产业高层论坛

作者： q.zhu Y.M.Zhang J.Zhang Z.q.zhu q.J.Liu Yunnan Key Laboratory forMicro/nanoMaterials&Technology YunnanUniversity

A new gas sensor with high response and selectivity was fabricated by using molecularly imprinted powders(MIPs)which provide special recogni-tion sites to *** MIPs were characterized by X-ray diffraction(XRD),fourier transform infrared spectrometer(FT-IR)and transmission electron microscopy(TEM),*** gas sensing properties of MIPs to methanol were *** experimental results indicate that the sensors based on the MIPs show excellent gas sensing properties to methanol vapor,and the properties of the sensor with x=6:10(x=methyl acrylic acid:LaFeO,molar ratio)are the *** the optimal operating temperature of130℃,the response of the sensor(x=6:10)to 1 ppm methanol is 21,and the response and recovery times are 57 s and 67 s,respectively.

关键词： Methanol Gas sensor Molecularly imprinted powders(MIPs)

Strong and Selective Isotope Effect in the Vacuum Ultraviolet Photodissociation Branching Ratios of Carbon Monoxide

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Strong and Selective Isotope Effect in the Vacuum Ultraviole...

第十六届全国化学动力学会议

作者： P.Jiang X.Chi q.zhu M.Cheng Hong Gao Beijing National Laboratory for Molecular Sciences (BNLMS) Institute of ChemistryChinese Academy of Sciences University of Chinese Academy of Sciences

Rare isotope (C,O and O) substitutions can substantially change absorption line positions,oscillator strengths and photodissociation rates of carbon monoxide (CO) in the vacuum ultraviolet (VUV) region,which has been well accounted for in recent photochemical models for understanding the large isotopic fractionation effects that are apparent in carbon and oxygen in the solar system and molecular clouds[1,2].Here,we demonstrate a strong isotope effect associated with the VUV photodissociation of CO by comparing the branching ratios of CO *** measurements show that the quantum yields of electronically excited C atoms in the photodissociation of CO are dramatically different from those of CO,revealing strong isotope *** isotope effect strongly depends on specific quantum states of CO being excited,which implies that such effect must be considered in the photochemical models on a state by state basis[3].

关键词： Isotope effect photodissociation branching ratio vacuum ultraviolet carbon monoxide

COLOR ARRAY IN TFA TECHNOLOGY

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COLOR ARRAY IN TFA TECHNOLOGY

1995 4th International Conference on Solid-State and Integrated Circuit Technology

作者： q.zhu T.Lulé H.Stiebig T.Martin J.Giehl J.Zhou H.Fischer M.Bhm Universitat-GH Siegen Institut fur Halbleiterelektronik （IHE） D-57068 Siegen Germany Universitat-GH Siegen Institut fur Halbleiterelektronik （IHE） D-57068 Siegen Germany Universitat-GH Siegen Institut fur Halbleiterelektronik （IHE） D-57068 Siegen Germany Universitat-GH Siegen Institut fur Halbleiterelektronik （IHE） D-57068 Siegen Germany Universitat-GH Siegen Institut fur Halbleiterelektronik （IHE） D-57068 Siegen Germany Universitat-GH Siegen Institut fur Halbleiterelektronik （IHE） D-57068 Siegen Germany Universitat-GH Siegen Institut fur Halbleiterelektronik （IHE） D-57068 Siegen Germany Universitat-GH Siegen Institut fur Halbleiterelektronik （IHE） D-57068 Siegen Germany

＜正＞ A novel color image sensor array based on TFA （Thin Film on ASIC） technology is described In the array a-Si（C）:H nipin diodes act as optical three color detectors, whereas the crystalline circuit provides photo current integration and signal readout. In this way a single pixel sequentially generates a full color RGB signal without the need of color filters The transient response of the diode under pulsed illumination is examined in order to evaluate the impact of the detector speed on sensor performance and image quality. By proper design of the pixel electronics and technological means the full dynamic range of the color diode can be exploited in the array.

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Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulses

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Matter and Radiation at Extremes 2024年第4期9卷 54-67页

作者： q.K.Liu L.Deng q.Wang X.Zhang F.q.Meng Y.P.Wang Y.q.Gao H.B.Cai S.P.zhu Graduate School China Academy of Engineering PhysicsBeijing 100088China Institute of Applied Physics and Computational Mathematics Beijing 100094China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Shanghai Institute of Laser Plasma Shanghai 201800China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China School of Physics Zhejiang UniversityHangzhou 310027China

We examine electron kinetic effects in broadband-laser-driven back-stimulated Raman scattering(BSRS)bursts using particle-in-cell *** bursts occur during the nonlinear stage,causing reflectivity spikes and generating large numbers of hot ***-duration simulations are performed to observe burst events,and a simplified model is developed to eliminate the interference of the broadband laser’s random intensity *** the simplified model,we isolate and characterize the spectrum of electron plasma *** spectrum changes from a sideband structure to a turbulence-like structure during the burst.A significant asymmetry in the spectrum is *** asymmetry is amplified and transferred to electron phase space by high-intensity broadband laser pulses,leading to violent vortex-merging and generation of hot *** proportion of hot electrons increases from 6.76%to 14.7%during a single violent burst *** demonstrate that kinetic effects profoundly influence the BSRS evolution driven by broadband lasers.

关键词： scattering kinetic simplified

Modeling dissolved organic carbon in temperate forest soils:TRIPLEX-DOC model development and validation

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Modeling dissolved organic carbon in temperate forest soils:...

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： H.Wu C.Peng T.R.Moore D.Hua C.Li q.zhu M.Peichl M.A.Arain Z.Guo Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics Chinese Academy of Science Department of Biology Sciences Institute of Environment Sciences University of Quebec at Montreal Laboratory for Ecological Forecasting and Global Change College of Forestry Northwest A & F University Department of Geography and Global Environmental and Climate Change Centre McGill University Center for Climate Research University of Wisconsin-Madison Institute for the study of Earth Ocean and Space University of New Hampshire Department of Forest Ecology and Management Swedish University of Agricultural Sciences School of Geography and Earth Sciences and McMaster Centre for Climate Change McMaster University

Even though dissolved organic carbon(DOC) is the most active carbon(C) cycling in soil organic carbon(SOC) pools, it receives little attention from the global C budget. DOC fluxes are critical to aquatic ecosystem inputs and contribute to the C balance of terrestrial ecosystems, but few ecosystem models have attempted to integrate DOC dynamics into terrestrial C cycling. This study introduces a new process-based model, TRIPLEX-DOC, that is capable of estimating DOC dynamics in forest soils by incorporating both ecological drivers and biogeochemical processes. TRIPLEXDOC was developed from Forest-DNDC, a biogeochemical model simulating C and nitrogen(N) dynamics, coupled with a new DOC process module that predicts metabolic transformations,sorption/desorption, and DOC leaching in forest soils. The model was validated against field observations of DOC concentrations and fluxes at white pine forest stands located in southern Ontario, Canada. The model was able to simulate seasonal dynamics of DOC concentrations and the magnitudes observed within different soil layers, as well as DOC leaching in the age sequence of these forests. Additionally,TRIPLEX-DOC estimated the effect of forest harvestingon DOC leaching, with a significant increase following harvesting,illustrating that land use change is of critical importance in regulating DOC leaching in temperate forests as an important source of C input to aquatic ecosystems.

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Electromagnetic Performance Analysis of Variable Flux Memory Machines with Series-magnetic-circuit and Different Rotor Topologies

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CES Transactions on Electrical Machines and Systems 2024年第1期8卷 3-11页

作者： qiang Wei Z.q.zhu Yan Jia Jianghua Feng Shuying Guo Yifeng Li Shouzhi Feng Department of Electronic and Electrical Engineering The University of SheffieldSheffield S13JDU.K. IEEE the CRRC zhuzhou Institute Company Ltd. Zhuzhou 412001China

In this paper,the electromagnetic performance of variable flux memory(VFM)machines with series-magnetic-circuit is investigated and compared for different rotor *** on a V-type VFM machine,five topologies with different interior permanent magnet(IPM)arrangements are evolved and optimized under same *** on two-dimensional(2-D)finite element(FE)method,their electromagnetic performance at magnetization and demagnetization states is *** reveals that the iron bridge and rotor lamination region between constant PM(CPM)and variable PM(VPM)play an important role in torque density and flux regulation(FR)***,the global efficiency can be improved in VFM machines by adjusting magnetization state(MS)under different operating conditions.

关键词： Memory machine Permanent magnet Rotor topologies Series magnetic circuit Variable flux

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Re-Distributing Facial Features for Engagement Prediction with ModernTCN

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Computers, Materials and Continua 2024年第1期81卷 369-391页

作者： Li X. zhu W. Li q. Hou C. Zhang Y. College of Information and Artificial Intelligence Nanchang Institute of Science and Technology Nanchang 330108 China School of Electrical and Information Engineering Wuhan Institute of Technology Wuhan 430205 China School of Electronic Information Engineering Wuhan Donghu University Wuhan 430212 China

Automatically detecting learners’ engagement levels helps to develop more effective online teaching and assessment programs, allowing teachers to provide timely feedback and make personalized adjustments based on students’ needs to enhance teaching effectiveness. Traditional approaches mainly rely on single-frame multimodal facial spatial information, neglecting temporal emotional and behavioural features, with accuracy affected by significant pose variations. Additionally, convolutional padding can erode feature maps, affecting feature extraction’s representational capacity. To address these issues, we propose a hybrid neural network architecture, the redistributing facial features and temporal convolutional network (RefEIP). This network consists of three key components: first, utilizing the spatial attention mechanism large kernel attention (LKA) to automatically capture local patches and mitigate the effects of pose variations; second, employing the feature organization and weight distribution (FOWD) module to redistribute feature weights and eliminate the impact of white features and enhancing representation in facial feature maps. Finally, we analyse the temporal changes in video frames through the modern temporal convolutional network (ModernTCN) module to detect engagement levels. We constructed a near-infrared engagement video dataset (NEVD) to better validate the efficiency of the RefEIP network. Through extensive experiments and in-depth studies, we evaluated these methods on the NEVD and the Database for Affect in Situations of Elicitation (DAiSEE), achieving an accuracy of 90.8% on NEVD and 61.2% on DAiSEE in the four-class classification task, indicating significant advantages in addressing engagement video analysis problems. © 2024 The Authors. Published by Tech Science Press.

关键词： Engagement prediction re-distributing facial features spatiotemporal network temporal convolutional network