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linear complexity of quaternary sequences with odd period and low autocorrelation

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The Journal of China Universities of Posts and Telecommunications 2014年第5期21卷 89-93页

作者： KE pin-hui lin Chang-lu ZHANG Sheng-yuan Fujian Provincial Key Laboratory of Network Security and Cryptology Fujian Normal University

Equivalence between two classes of quaternary sequences with odd period and best known autocorrelation are proved. A lower bound on the linear complexity of these sequences is presented. It is shown that the quaternar... 详细信息

关键词： quaternary sequences linear complexity cyclotomy

Analysis of peripapillary retinal nerve fiber layer and inner macular layers by spectral-domain optical coherence tomography for detection of early glaucoma

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International Journal of Ophthalmology(English edition) 2018年第7期11卷 1163-1172页

作者： Pei-Wen lin Hsueh-Wen Chang Jih-pin lin Ing-Chou Lai Department of Ophthalmology Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine Department of Biological Sciences Sun Yat-Sen University

AIM： To analyze the diagnostic capabilities of peripapillary retinal nerve fiber layer（p RNFL） thickness and segmented inner macular layer（IML） thickness measured by spectraldomain optical coherence tomography for detection of early glaucoma. METHODS： Fifty-three patients with primary open angle glaucoma（POAG）, 60 patients with normal tension glaucoma（NTG） and 32 normal control subjects were enrolled. Thicknesses of p RNFL, total macular layers（TML）, and the IML, including macular RNFL（m RNFL） and macular ganglion cell layer（m GCL） were assessed. The areas under the receiver operating characteristic curves（AROC） were calculated to compare the diagnostic power of different parameters. RESULTS： There were no differences in the parameters of p RNFL, TML, and IML between POAG and NTG groups. The thicknesses of superior and inferior m GCL showed significant correlation with mean deviation of visual field（R2=0.071, P=0.004; R2=0.08, P=0.002）. The m GCL thickness significantly correlated with the p RNFL thickness in the superior and inferior quadrants（R2=0.156, P〈0.001; R2=0.407, P〈0.001）. The thickness of the inferior-outer sector of macula had greater AROCs than those in the inferior-inner sector of macula. The AROCs for superior（0.894） and inferior（0.879） p RNFL thicknesses were similar with the AROCs for superior（0.839） and inferior m GCL（0.864） thicknesses. Sensitivities at 80% specificity for global p RNFL, inferior-outer m GCL and inferior-outer m RNFL thicknesses were 0.938, 0.867, and 0.725, respectively. CONCLUSION： The diagnostic capability of the m GCL thickness is comparable to that of the p RNFL thickness in patients with early glaucoma. The inferior-outer sector of IML has a better diagnostic capability than the inferiorinner sector of IML for detection of early glaucoma.

关键词： retinal nerve fiber layer ganglion cell layer primary open angle glaucoma normal tension glaucoma optical coherence tomography

Theoretical Analysis of A Buoyant Jet Interacting with Small Amplitude Waves

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China Ocean Engineering 2009年第1期23卷 73-84页

作者： Ying-pin lin Hung-Chu HSU Yang-Yih CHEN Department of Marine Environment and Engineering National Sun Yat-Sen Uaivershy Kaohsiung 804 China Tainan Hydraulics Laboratory Research Center of Ocean Environment and Technology National Cheng Kung University Tainan 701 China

A new theoretical solution is presented here for the dynamic characteristics of a buoyant jet due to opposing small amplitude waves. The conservation equations of mass, tangential moment^n and vertical momentum are solved by the integral method which encompasses the Gaussian profiles of velocity and density. The action of waves is incorporated into the equations of motion as an external force and a new exact solution is obtained to predict the trajectory, velocity distribution and boundary thickness of the buoyant jet over an arbitrary lateral cross section. It is found that the velocity along the centerline is inversely proportional to the ratio of the momentum of the wave to the buoyant jet. The averaged bound- ary width varies with the fluctuation of the boundary width, the distance from the orifice and the velocity correction function. Owing to the motion of waves, the fluctuation of the boundary width is proportional to the wave steepness.

关键词： buoyant jet small amplitude waves radiation stress jet trajectory

A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range

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Frontiers of Information Technology & Electronic Engineering 2017年第3期18卷 410-422页

作者： Hui-pin lin Xiao-guang JIN Liang XIE Jin HU Zheng-yu LU College of Electrical Engineering Zhejiang UniversityHangzhou 310027China

This paper proposes a new variable-mode control strategy that is applicable for LLC resonant converters operating in a wide input voltage range. This control strategy incorporates advantages from full-bridge LLC resonant converters, half-bridge LLC resonant converters, variable-frequency control mode, and phase-shift control mode. Under this control strategy, different input voltages determine the different operating modes of the circuit. When the input voltage is very low, it works in a full-bridge circuit and variable frequency mode(FB_VF mode). When the input voltage rises to a certain level, it shifts to a full-bridge circuit and phase-shifting control mode(FB_PS mode). When the input voltage further increases, it shifts into a half-bridge circuit and variable frequency mode(HB_VF mode). Such shifts are enabled by the digital signal processor(DSP), which means that no auxiliary circuit is needed, just a modification of the software. From light load to heavy load, the primary MOSFET for the LLC resonant converter can realize zero-voltage switching(ZVS), and the secondary rectifier diode can realize zero-current switching(ZCS). With an LLC resonant converter prototype with a 300 W rated power and a 450 V output voltage, as well as a resonant converter with 20–120 V input voltage, the experiments verified the proposed control strategy. Experimental results showed that under this control strategy, the maximum converter efficiency reaches 95.7% and the range of the input voltage expands threefold.

关键词： LLC Full bridge Half bridge Variable frequency Phase shift Wide input voltage range

Root-associated(rhizosphere and endosphere) microbiomes of the Miscanthus sinensis and their response to the heavy metal contamination

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Journal of Environmental Sciences 2021年第6期33卷 387-398页

作者： Xiaoxu Sun Benru Song Rui Xu Miaomiao Zhang pin Gao Hanzhi lin Weimin Sun National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China

The plant root-associated microbiomes, including both the rhizosphere and the root endosphere microbial community, are considered as a critical extension of the plant genome. Comparing to the well-studied rhizosphere microbiome, the understanding of the root endophytic microbiome is still in its infancy. Miscanthus sinensis is a pioneering plant that could thrive on metal contaminated lands and holds the potential for phytoremediation applications. Characterizing its root-associated microbiome, especially the root endophytic microbiome, could provide pivotal knowledge for phytoremediation of mine tailings. In the current study, M. sinensis residing in two Pb/Zn tailings and one uncontaminated site were collected. The results demonstrated that the metal contaminant fractions exposed strong impacts on the microbial community structures. Their influences on the microbial community, however, gradually decreases from the bulk soil through the rhizosphere soil and finally to the endosphere, which resulting in distinct root endophytic microbial community structures compared to both the bulk and rhizosphere soil. Diverse members affiliated with the order Rhizobiales was identified as the core microbiome residing in the root of M. sinensis. In addition, enrichment of plant-growth promoting functions within the root endosphere were predicted, suggesting the root endophytes may provide critical services to the host plant. The current study provides new insights into taxonomy and potential functions of the root-associated microbiomes of the pioneer plant, M. sinensis, which may facilitate future phytoremediation practices.

关键词： Tailing Miscanthus sinensis Root endosphere Metal(loid)s contamination

Turning machining induced microstructural stability of a high Nb-containing TiAl alloy during high temperature exposure

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Rare Metals 2016年第1期35卷 77-84页

作者： Lu Fang Jun-pin lin Xiao-Chan Qiu Jin-Xiao Ou Xian-Fei Ding State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing School of Architecture and Engineering Heilongjiang University National Center for Materials Service Safety University of Science and Technology Beijing

Turning machining induced microstructural instability was investigated in a fully lamellar Ti-45Al-8.5Nb-（W,B,Y） alloy during high temperature *** turning machining followed by thermal exposure at900 or 1000℃ for 100,300 and 500 h,a depth-dependent gradient microstructure with random orientations was produced in the region close to the machining *** typical layers,a fine-grained（FG） layer with equiaxed grains and a coarse-grained（CG） layer with elongated grains,are formed in this region in transversal *** thickness of the two layers is up to 120 urn after thermal exposure at 1000℃ for 500 h,which is less than the depth of the hardened region（200 μm） after turning *** of the new grains in FG and CG layers are constituted of γ single phase,while short α_2 segments and few B2 particles are precipitated at the γ/γ interface or inside the γ *** and phase boundary bulging are found to be the major mechanisms responsible for lamellar degradation in FG layer and CG layer,*** residual deformation energy stored is considered to be the main driving force of this process.

关键词： High Nb-containing TiAl alloy Residualdeformation energy Microstructural instability Recrystallization Phase transformation

Predictive current control of multi-pulse flexible-topology thyristor AC-DC converter

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第4期14卷 296-310页

作者： Da-min ZHANG Shi-tao WANG Hui-pin lin Zheng-yu LU School of Electrical Engineering Zhejiang University State Grid of China Technology College

This paper proposes a novel multi-pulse flexible-topology thyristor rectifier(FTTR) that can operate over a large voltage range while maintaining a low total harmonic distortion(THD) in the input *** proposed multi-pulse FTTR has two operating modes:parallel mode and series *** of the mode in which it operates,the multi-pulse FTTR maintains the same pulses in the load *** mitigate the harmonic injection into the AC mains,the topology-switching mechanism is then *** addition,predictive current control is employed to achieve fast current response in both the transience and the transitions between *** verify the effectiveness of the multi-pulse FTTR as well as the control scheme,performance analysis based on an 18-pulse FTTR is investigated in detail,including fault tolerance evaluation,current THD analysis based on IEEE standard,and potential ***,a simulation model and the corresponding laboratory setup are *** results from both simulation and experiments demonstrate the feasibility of the proposed multi-pulse FTTR as well as the control scheme.

关键词： Flexible-topology operation Multi-pulse thyristor rectifier Predictive current control Fast current response Fault tolerance evaluation

Reaction behaviors occurring in Ti/Al foil metallurgy

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Rare Metals 2016年第1期35卷 100-105页

作者： Zheng-Zhang Shen Jun-pin lin Yong-Feng Liang Lai-Qi Zhang Guo-Jian Hao State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

Reaction behaviors occurring in Ti/Al foil metallurgy were systematically *** emphasis was focused on the reaction between solid Al and Ti as well as subsequent reaction between TiAland Ti *** the solid reaction between Al and Ti,the presence of residual Al is mainly caused by inhomogeneous growth of TiAllayer and micro-voids existing at the ***,through reaction between molten Al and Ti,TiAl/Ti multilayer can be achieved with complete consumption of *** subsequent high-temperature heat treatment,TiAl/Ti multilayer will eventually turn into TiAl/TiAl multilayer accompanying with simultaneous formation and successive disappearance of intermediate phases,such as TiAland ***,it is found that the growth direction of TiAl layer changes as a function of annealing time between different couples in multi-intermetallics system.

关键词： Reaction behavior Foil metallurgy Multilayer TiAl3 TiAl

Clean-up and disposal process of polluted sediments from urban rivers

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Journal of Environmental Sciences 2001年第4期13卷 435-438页

作者： HE pin-jing SHAO Li-ming GU Guo-wei BIAN Cheng-lin XU Chen State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and Engineering Tongji UniversityShanghai 200092China Urban River Management Agency Yangpu Di strictShanghai 200093China

In this paper, the discussion is concentrated on the properties of the polluted sediments and the combination of clean-up and disposal process for the upper layer heavily polluted sediments with good flowability. Based on the systematic analyses of various clean-up processes, a suitable engineering process has been evaluated and recommended. The process has been applied to the river reclamation in Yangpu District of Shanghai City, China. An improved centrifuge is used for dewatering the dredged sludge, which plays an important role in the combination of clean-up and disposal process. The assessment of the engineering process shows its environmental and technical economy feasibility, which is much better than that of traditional dredging-disposal processes.

关键词： urban rivers polluted sediments clean-up disposal dredging dewatering feasibility analysis