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From multicolor-photometric observations to a guaranteed mass of AL Cas

Research in Astronomy and Astrophysics 2019年第8期19卷 19-30页

作者： Ya-Hui Wang Jin-Zhong liu Li-Na lu Guo-Liang Lü School of Physical Science and Technology Xinjiang UniversityUrumqi830046China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi830011China University of Chinese Academy of Sciences Beijing100049China

We utilize the PAdova and TRieste Stellar Evolution Code(PARSEC) combined with photometric observations to determine a guaranteed mass of AL Cas and re-examine its related physical ***-photometric observations of AL Cas have been performed in 2016 and 2017. We use the WilsonDevinney(W-D) code to analyze the light curves and find that AL Cas is probably an A-subtype contact binary(f = 35.7±0.9%) with a mass ratio q = 0.6399±0.0230 and an effective temperature difference?T = 78 K. The mass-radius relation of a higher luminosity component for AL Cas is obtained by two methods: depending on calculation of the Roche lobe(DCRL method) and depending on calculation of the W-D code(DCWD method). Using this relationship with the PARSEC model, we investigate the component masses of AL Cas as M1 = 1.19±0.23 M⊙ with M2 = 0.76±0.18 M⊙ by the DCRL method and M1 = 1.22±0.26 M⊙ with M2 = 0.78±0.20 M ⊙ by the DCWD method. By means of the photometric studies, we examine the related physical properties of AL Cas with the latest findings. We update the orbital period(Porb = 0.50055593 d) of AL Cas according to six new times of light minimum together with those collected from the literature. Meanwhile, the(O-C)2 curve analysis suggests that the orbital period of AL Cas has a cyclic variation with a period of 81.25 yr and an amplitude of 0.01415 d. This cyclic change would be caused by the light-travel time effect from a third body. A similar mass of the third body(M3 sin i′= 0.279 M⊙) is derived from our two methods.

关键词： stars:binaries:close stars:binaries:eclipsing stars:individual:AL Cassiopeiae

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Scale-free brain ensemble modulated by phase synchronization

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第10期15卷 821-831页

作者： Dan WU Chao-yi LI Jie liu Jing lu De-zhong YAO Department of Biomedical Engineering School of Computer and Information TechnologyBeijing Jiaotong University NeuroInformation of Ministry of Education University of Electronic Science and Technology of China

To listen to brain activity as a piece of music, we proposed the scale-free brainwave music(SFBM) technology, which could translate the scalp electroencephalogram(EEG) into music notes according to the power law of both EEG and music. In the current study, this methodology was further extended to a musical ensemble of two channels. First, EEG data from two selected channels are translated into musical instrument digital interface(MIDI) sequences, where the EEG parameters modulate the pitch, duration, and volume of each musical note. The phase synchronization index of the two channels is computed by a Hilbert transform. Then the two MIDI sequences are integrated into a chorus according to the phase synchronization index. The EEG with a high synchronization index is represented by more consonant musical intervals, while the low index is expressed by inconsonant musical intervals. The brain ensemble derived from real EEG segments illustrates differences in harmony and pitch distribution during the eyes-closed and eyes-open states. Furthermore, the scale-free phenomena exist in the brainwave ensemble. Therefore, the scale-free brain ensemble modulated by phase synchronization is a new attempt to express the EEG through an auditory and musical way, and it can be used for EEG monitoring and bio-feedback.

关键词： Brainwave Ensemble Music Scale-free Synchronization

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Integrated Online Consumer Preference Mining for Product Improvement with Online Reviews

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Journal of Systems Science and Information 2019年第1期10卷 17-36页

作者： Jie LI Qiaoling LAN lu liu Fang YANG School of Economics and Management Hebei University of Technology

Exploring consumer preferences for a product is essential for the enterprise in product improvement. Many studies have been conducted in consumer preference. However, few studies have concentrated on evaluating the product and service characteristics of a speci?c product, to facilitate product and service improvements. This study proposes a systematic research framework for exploring major product and service features that re?ect consumer preferences based on the online reviews. By creatively integrating quantitative studies of multiple linear regression and meta-analysis,this study expects to generate a feature-based preference importance ranking. Furthermore, by adopting an importance-satisfaction analysis, we can draw a matrix that is valuable in product *** with the preference rankings, implications for competitive strategies that facilitate product improvement can be drawn. The effectiveness of this methodology is veri?ed by a case study of laptop on the basis of the online reviews from ***.

关键词： consumer preference product improvement online reviews meta-analysis

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Bio-based removable pressure-sensitive adhesives derived from carboxyl-terminated polyricinoleate and epoxidized soybean oil

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Chinese Chemical Letters 2021年第2期32卷 875-879页

作者： yu-Fei Lei Xiao-Lin Wang Bo-Wen liu Li Chen yu-Zhong Wang The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu 610064China

A novel kind of fully bio-based PSAs we re obtained through the curing reaction between two components derived from the plant oils:carboxyl-terminated polyricinoleate(PRA) fro m the castor oil and epoxidized soybean oil(ESO).The get content,glass transition temperature(Tg),rheological behavior,tensile strength,creep resistance and 180° peel strength of the PSAs were feasibly tailored by adjusting the component ratio of ESO to *** low cross-linking level,the PSAs behaved like a viscous liquid and did not possess enough cohesiveness to sustain the mechanical stress during peeling,The PSAs cross-linked at or near the optimal stoichiometric conditions displayed an adhesive(interfacial) failure between the substrate and the adhesive layer,which were associated with the lowest adhesion *** PSAs with the dosage amount of ESO ranging from 10.20 wt% were tacky and flexible,which exhibited 1800 peel strength ranging from 0.4~2.3 N/cm;and could be easily removed without any residues on the *** process for the preparation of the fully bio-based PSAs was environmentally friendly without using any orga nic solve nt or other toxic chemical,herein showing the great potential as sustainable materials.

关键词： Pressure sensitive adhesive Polyricinoleate Epoxidized soybean oil Viscoelasticity Removability

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Chemical Modification of Tryptophan Residues in Superoxide Dismutase from Camellia Pollen and Its Fluorescence Spectrum

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Chemical Research in Chinese Universities 2005年第5期21卷 562-565页

作者： HE Xiao-hong WU Min LI Shan-yu CHU yu-zhuo CHEN Jia liu Lan-ying College of Life Science Jilin University Changchun 130023 P. R. China

The amino acid composition of the superoxide dismutase（SOD） from camellia pollen was measured and the tryptophan（Trp） residues were modified by using N-bromosuccinimide（NBS）. The results show that there are 21 Trp residues in an SOD molecule and seven of which are located on the surface of the enzyme. By researching the fluorescence spectra of the native SOD and the modified SOD, we have found that the emission wavelength of Trp is at 335 nm and the fluorescence intensity will decrease when the enzyme is modified. The results also show that potassium iodide（KI） can significantly quench the fluorescence of the native SOD, but it has a less pronounced effect on the modified enzyme. Glycerin as a surface activation reagent can stabilize the fluorescence of the modified enzyme.

关键词： Superoxide dismutase Tryptophan residue Chemical modification Fluorescence spectrum

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Peptide Functionalized Nanoplasmonic Sensor for Explosive Detection

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Nano-Micro Letters 2016年第1期8卷 36-43页

作者： Diming Zhang Qian Zhang Yanli lu Yao Yao Shuang Li Jing Jiang Gang Logan liu Qingjun liu Biosensor National Special Laboratory Key Laboratory for Biomedical Engineering of Education Ministry Department of Biomedical Engineering Zhejiang University Micro and Nanotechnology Lab University of Illinois at Urbana-Champaign

In this study, a nanobiosensor for detecting explosives was developed, in which the peptide was synthesized with trinitrotoluene(TNT)-specific sequence and immobilized on nanodevice by Au–S covalent linkage, and the nanocup arrays were fabricated by nanoimprint and deposited with Au nanoparticles to generate localized surface plasmon resonance(LSPR). The device was used to monitor slight change from specific binding of 2,4,6-TNT to the peptide. With high refractive index sensing of ~10~4nm/RIU, the nanocup device can detect the binding of TNT at concentration as low as3.12×10^(-7)mg mL^(-1) by optical transmission spectrum modulated by LSPR. The nanosensor is also able to distinguish TNT from analogs of 2,4-dinitrotoluene and 3-nitrotoluene in the mixture with great selectivity. The peptide-based nanosensor provides novel approaches to design versatile biosensor assays by LSPR for chemical molecules.

关键词： Nanocup arrays Peptide 2,4,6-trinitrotoluene(TNT) Localized surface plasmon resonance(LSPR) Nanosensor

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Research on Architecture Design with High Reliability of Network Nodes in the Amphibious Combating Simulation System

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Wuhan University Journal of Natural Sciences 2019年第6期24卷 537-548页

作者： liu yu ZHANG Lili luO Rufen Unit 91976 of the Chinese PLA

Upper-lower computer mode is the main architecture design of the amphibious combat simulation system(ACSS)at *** continuous improvement of real-time performance,software and hardware infrastructure,the exponential growth of operational network data scale is realized,but the availability performance of ACSS *** reliability of the working host as the key node has become the bottleneck of the overall availability of network nodes in the *** optimize the network node architecture of ACSS,this paper presents an effective optimization solution by designing the dual redundancy warm-standby module of the mission computer and I/O port,the algorithm of selecting output path of the mission computer in network nodes,the decision-making algorithm upon the on-duty host and output,and the video output decision-making algorithm upon the upper ***,the complete process of operational data from the input to output and the opposite is implemented well to guarantee the overall availability of network nodes in the *** has great advantages of wide applicability,strong reliability and high real-time switching speed.

关键词： reliability amphibious combat simulation system architecture dual redundancy decision-making algorithm

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An Improved Lower Order Method of Modal Parameter Estimation for Offshore Structures Using Reconstructed Signals

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Journal of Ocean University of China 2015年第6期14卷 969-974页

作者： liu Fushun QIN Junfei LI Huajun lu Hongchao WANG Shuqing Department of Ocean Engineering Ocean University of China

For modal parameter estimation of offshore structures, one has to deal with two challenges: 1) identify the interested frequencies, and 2) reduce the number of false modes. In this article, we propose an improved method of modal parameter estimation by reconstructing a new signal only with interested frequencies. The approach consists of three steps: 1) isolation and reconstruction of interested frequencies using FFT filtering, 2) smoothness of reconstructed signals, and 3) extraction of interested modal parameters in time domain. The theoretical improvement is that the frequency response function(FRF) of filtered signals is smoothed based on singular value decomposition technique. The elimination of false modes is realized by reconstructing a block data matrix of the eigensystem realization algorithm(ERA) using the filtered and smoothed signals. The advantage is that the efficiency of the identification process of modal parameters will be improved greatly without introducing any false modes. A five-DOF mass-spring system is chosen to illustrate the procedure and demonstrate the performance of the proposed scheme. Numerical results indicate that interested frequencies can be isolated successfully using FFT filtering, and unexpected peaks in auto spectral density can be removed effectively. In addition, interested modal parameters, such as frequencies and damping ratios, can be identified properly by reconstructing the Hankel matrix with a small dimension of ERA, even the original signal has measurement noises.

关键词： modal parameter estimation interested frequency frequency response function(FRF)

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Pre-treatment of coconut kernels by proteases to modulate the flavour of coconut oil

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Food Bioscience 2022年第4期48卷 98-106页

作者： Wencan Zhang Jia Xin Chan yuyun lu Shao-Quan liu Department of Food Science and Technology Science Drive 2Faculty of ScienceNational University of Singapore117542Singapore National University of Singapore(Suzhou)Research Institute SuzhouJiangsu215123China

This study investigated the impact of protease pre-treatment of coconut kernels(CK)on the flavour modification of the resultant coconut oil(CO).The effects of four proteases(Alcalase,Flavourzyme,Neutrase and Protamex)pre-treatment on volatile modification of CO was screened and Flavourzyme was chosen for detailed *** was found to release not only free amino acids but also simple sugars,increasing the contents of soluble sugars and free amino acids in CK by 1.5-and 1.3-fold,respectively,compared to the untreated *** increments of these thermal reaction precursors accelerated the Maillard reaction and caramelisation during kernel roasting,resulting in the rise of volatile compounds in obtained CO by 2.1-,1.4-and 1.4-fold with light,medium and dark kernel roastings,***,volatile profiles of CO extracted from Flavourzyme treated CK differed significantly from those of the untreated control by having increments in furans and pyranones but decreases in furanones and *** component analysis(PCA)revealed that flavour of CO from Flavourzyme treated CK upon roasting was highly correlated with furans and ***-treatment by Flavourzyme of CK prior to oil production is a potential strategy to modulate and enhance the flavour of obtained CO and hence to widen its application in food industry.

关键词： Coconut kernel Coconut oil Protease Flavourzyme Flavour Roasting

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Influence of ENSO Events on Tropical Cyclone Activity over the Western North Pacific

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Journal of Ocean University of China 2019年第4期18卷 784-794页

作者： liu Zenghong CHEN Xingrong SUN Chaohui CAO Minjie WU Xiaofen lu Shaolei State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography Ministry of Natural Resources Hangzhou 310012 China National Marine Environmental Forecasting Center Ministry of Natural Resources Beijing 100081 China

Based on an analysis of 51-year (1965 2015) data, the influence of El Ni o Southern Oscillation (ENSO) events on tropical cyclone (TC) activity is examined over the western North Pacific (WNP). The total number of TCs formed in the entire WNP reduces by about 3.4 TCs per year in La Ni a years, whereas TCs have an equivalent genesis number between El Ni o years and climatology. During El Ni o years, the frequency of TC formation increases remarkably in the southeast quadrant (140 E 180 , 0 17 N) and decreases in the northwest quadrant (120 140 E, 17 30 N). During La Ni a years, TCs tend to form in the northwest and southwest quadrants (120 140 E, 0 17 N) quadrants. TCs tend to become long-lived in the peak season (from July to Septem- ber) of El Ni o years and during strong El Ni o events. TC genesis shows a southeastward positive shift in terms of lifetime and intensity during El Ni o years, thus more super TCs (winds ≥ 58.64 m s 1) are formed in the southeast quadrant. Further analysis using the genesis potential index (GPI) indicates that the interannual variations in the TC genesis and track are significantly influenced by a combination of large-scale dynamic and thermodynamic conditions.

关键词： ENSO tropical cyclone western North Pacific

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