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SRMD:Sparse Random Mode Decomposition

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Communications on Applied Mathematics and Computation 2024年第2期6卷 879-906页

作者： Nicholas Richardson Hayden Schaeffer Giang tran University of Waterloo WaterlooONCanada University of British Columbia VancouverBCCanada University of California Los AngelesCAUSA

Signal decomposition and multiscale signal analysis provide many useful tools for timefrequency *** proposed a random feature method for analyzing time-series data by constructing a sparse approximation to the *** randomization is both in the time window locations and the frequency sampling,which lowers the overall sampling and computational *** sparsification of the spectrogram leads to a sharp separation between time-frequency clusters which makes it easier to identify intrinsic modes,and thus leads to a new data-driven mode *** applications include signal representation,outlier removal,and mode *** benchmark tests,we show that our approach outperforms other state-of-the-art decomposition methods.

关键词： Sparse random features Signal decomposition Short-time Fourier transform

Noetherian Dimension and Co-localization of Artinian Modules over Local Rings

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Algebra Colloquium 2014年第4期21卷 663-670页

作者： Le Thanh Nhan tran Do Minh Chau Thai Nguyen College of Sciences Thai Nguyen Vietnam

Let （R,m） be a Noetherian local ring. Denote by N-dimnA the Noetherian dimension of an Artinian R-module A. In this paper, we give some characterizations for the ring R to satisfy N-dimRA = dim（R/AnnRA） for certain Artinian R-modules A. Then the existence of a co-localization compatible with Artinian R-modules is studied and it is shown that if it is compatible with local cohomologies of finitely generated modules, then the base ring is universally catenary and all of its formal fibers are Cohen-Macaulay.

关键词： Artinian modules co-localization going up formal fibers

Persistence in tillage decisions: Aggregate data analysis

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International Soil and Water Conservation Research 2019年第2期7卷 109-118页

作者： Dat Q.tran Lyubov A.Kurkalova University of Arkansas at Fayetteville AR 72701Department of Agricultural Economics and AgribusinessUSA Can Tho University Department of Hydraulic EngineeringVietnam 1601 E.Market St. GreensboroNC27411North Carolina A&T State UniversityDepartment of EconomicsUSA 1601 E.Market St. GreensboroNC27411North Carolina A&T State UniversityDepartment of Energy and Environmental SystemsUSA

The Emission Gap Report 2013 from the United Nations Environment Program showed that adopting conservation tillage such as no-till,as an alternative to conventional tillage,contributes significantly to climate change mitigation through carbon ***,substantial amounts of soil carbon are lost when farmers interrupt continuous use of conservation tillage with conventional *** tillage is spreading,but little is known about the behavioral persistence in tillage *** address the gap in the literature,we estimate county-specific Markov models of tillage-crop choices,and use the predicted probabilities of alternative two-and three-year tillage rotations to evaluate spatial variation and temporal persistence in conservation tillage adoption for the state of lowa (U.S).We find that the county-average probabilities of continuous conservation tillage range between 0.133 and 0.295,and vary significantly among crop *** also find a statistically strong positive effect of the incidence of the highly erodible land on the county-average use of continuous conservation *** results underscore the importance of dynamic modeling for understanding behavioral persistence in tillage decisions,and the interdependence between farmers' crop and tillage rotations.

关键词： Aggregate data Continuous conservation tillage Markov chain model Crop rotations Highly erodible land

Influence of thermal treatment on electronic properties of inkjet-printed zinc oxide semiconductor

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International Journal of Smart and Nano Materials 2022年第2期13卷 330-345页

作者： Van-Thai tran Yuefan Wei Hejun Du Singapore Centre for 3D Printing Nanyang Technological UniversitySingapore Advanced Remanufacturing and Technology Centre Singapore School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore

Additive manufacturing of electronic devices using inkjet printing provides a potential alternative approach in substitution for con-ventional electronic fabrication ***,the complex nature of inkjet printing involves the liquid deposition and film formation from the vaporization of solvent,which makes it different from film created by conventional deposition *** print-ing of zinc oxide(ZnO),which is a widely utilized semiconductor,produces polycrystalline film composed of nano-size grains,which could significantly influence the properties of printed *** this study,low-temperature annealing was employed to treat inkjetprinted ZnO for UV photodetection application,and its influence on electrical properties was *** bending was character-ized using the Mott-Schottky plot which examines the charge dis-tribution of the *** is found that the annealing of inkjet-printed polycrystalline ZnO film has improved its electrical properties,which could be attributed to the reduction of band bending due to the merging of *** treatment also helps to reduce impurities of the film,such as zinc hydroxide complexes,which is common for solution-derived ***,the study could pay the way for the improvement of electrical properties of inkjet-printed functional materials.

关键词： Inkjet printing zinc oxide electrical properties band bending thermal annealing

Nitrate removal and extracellular polymeric substances of autohydrogenotrophic bacteria under various pH and hydrogen flow rates

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Journal of Environmental Sciences 2018年第1期30卷 50-57页

作者： tran-Ngoc-Phu Nguyen Pei-Chung Chen Chihpin Huang Institute of Enuironmental Engineering National Chiao Tung UniuersityHsinchu 300Chinese Taipei

In recent years there has been an increasing interest in the use of autohydrogenotrophic bacteria to treat nitrate from wastewater. However, our knowledge about the characteristics of extracellular polymeric substances（EPS） releasing by these activities is not yet very advanced. This study aimed to investigate the change in EPS compositions under various p H values and hydrogen flow rates, taking into consideration nitrogen removal. Results showed that p H 7.5 and a hydrogen flow rate of 90 m L/min were the optimal operating conditions, resulting in 100% nitrogen removal after 6 hr of operation. Soluble and bound polysaccharides decreased, while bound proteins increased with increasing p H. Polysaccharides increased with increasing hydrogen flow rate. No significant change of bound proteins was observed at various hydrogen flow rates.

关键词： Autohydrogenotrophic bacteria Nitrate removal Extracellular polymeric substances Polysaccharides Proteins

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Cell-type resolved transcriptomic approaches for dissecting selective vulnerability in neurodgeneration

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Neural Regeneration Research 2024年第7期19卷 1411-1413页

作者： Caleb A.Wood Nicholas M.tran Department of Neuroscience Baylor College of MedicineHoustonTXUSA Department of Molecular and Human Genetics Baylor College of MedicineHoustonTXUSA

A common feature among neurodegenerative conditions is that ce rtain neuronal populations are selectively vulnerable to loss(Fu et al.,2018).By corollary,other neurons are selectively resilient,suggesting they may possess unique features that support their survival.U nderstanding the basis of neuronal resilience or vulnerability would provide a logical strategy to identify factors that could be targeted therapeutically.

关键词： selective targeted

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Surface characterization of polyimide and polyethylene terephthalate membranes toward plasma and UV treatments

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Progress in Natural Science:Materials International 2022年第3期32卷 314-327页

作者： Thi Sinh Vo tran Thi Bich Chau Vo School of Mechanical Engineering Sungkyunkwan University Department of Industrial Management Can Tho University

This study is to bring an overview on various methods regarding the surface treatment performed on different polymeric membranes in relation to a deference between the treatment mechanism and their chemical ***, plasma and UV surface treatments(PST and UST) were utilized to treat the surfaces of two commercial membranes, i.e., aromatic polyimide and polyethylene terephthalate for various durations using a discharge electrode and an UV LED curing system, respectively. Based on the effects of PST and UST processes on the surface of these membranes, their surface properties have been characterized to surface morphology and hydrophilicity(or wettability), at same time the changes have probably occurred on their surface during the PST and UST processes. As a result, their hydrophilic behavior was significantly enhanced after conducting these treatment processes based on the investigation of water contact angle. Moreover, Fourier-transform infrared and Raman spectroscopy manifested the changes in the chemical bonds, interactions and orientations of molecules, which confirmed the apparition and insertion of polar functional groups after the surface treatments, and accordingly,their wettability was enhanced significantly. Also, optical microscopy images showed direct impactions on their surface and the evidence of slight surface aging/damage during the treatment processes based on the presentation of the strange streaks on the treated surfaces. In particular, the peel forces exhibited an increase comparing to the initial membranes, which is characteristically for enhancing their adhesion behavior. Hence, these results are needful for improving the surface properties of a material, and obtaining better adhesion behavior on the membrane-like materials and recycling polymer materials.

关键词： Plasma treatment UV treatment Polymeric membrane Aromatic polyimide Polyethylene terephthalate

Graphene oxide-covered melamine foam utilizing as a hybrid foam toward organic dye removal and recyclability

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Progress in Natural Science:Materials International 2022年第3期32卷 296-303页

作者： Thi Sinh Vo tran Thi Bich Chau Vo School of Mechanical Engineering Sungkyunkwan University Department of Industrial Management Can Tho University

Graphene-based adsorbents have been attracted extensive interest in recent years. Herein, graphene oxidecovered melamine foam(GO-covered MF) was designed and prepared by a mild submerge-covering method with the support of a super-hydrophilic melamine framework, showing its adsorption performances for various organic dyes. The structure morphology as well as chemical, thermal and mechanical properties of the as-obtained hybrid foam(HF) were further determined for the possible structure changes after covering the GO sheets on the MF framework. Moreover, the HF exhibited an excellent ability for organic dye adsorption application, and which was well fitted in the pseudo-second-order kinetic and Langmuir models corresponding to a chemical adsorption and a mono-layer approach during the adsorption process. The maximum adsorption capacity by using the asobtained HF corresponded to 258.56 mg g-1(methylene blue), 233.22 mg g-1(Rhodamine B), 206.92 mg g-1(methyl orange), and 184.93 mg g-1(Congo red), which are competitive with that of other graphene-based absorbents. In particular, the HF could be reused without a noticeable degradation of organic dye removal performance. As such, the HF prepared in this study can become an encouraging candidate for practical application owing to the reliable recyclability and low-cost.

关键词： Graphene oxide Melamine foam Organic dye Adsorption Hybrid foam Recyclability

Safeguarding transcriptional memory: a mitotic bookmarking role for chromatin remodelers

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Signal transduction and Targeted Therapy 2023年第11期8卷 5132-5133页

作者： Godwin Sokpor Huu Phuc Nguyen tran Tuoc Department of Human Genetics Ruhr University of BochumBochumGermany Lincoln Medical School University of LincolnLincolnUK

A recent study published in Nature reveals an interaction between SWI/SNF subunits and mitotic chromatin,which is essential for establishing gene bookmarks and preserving cell identity.1 The findings deepen our understanding of how SWI/SNF complexes regulate transcriptional memory heritability for cell fate commitment(Fig.1),thus validating the indispensability of SWI/SNF complexes in development and association of their perturbance with tumorigenesis and neurodevelopment disorders.

关键词： establishing complexes preserving