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Examination of n-T_(9) conditions required by N=50,82,126 waiting points in r-process

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Communications in Theoretical Physics 2021年第10期73卷 147-157页

作者： nguyen Duy Ly nguyen ngoc Duy nguyen Kim Uyen Vinh N T Pham Faculty of Fundamental Sciences Vanlang UniversityHo Chi Minh City 700000Vietnam Department of Physics Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Physics Ho Chi Minh City University of EducationHo Chi Minh City 700000Vietnam

We examined the conditions of neutron density(n) and temperature(T9) required for the N = 50, 82,and 126 isotopes to be waiting points(WP) in the r-process. The nuclear mass based on experimental data presented in the AME2020 database(AME and AME ± Δ) and that predicted using FRDM,WS4, DZ10, and KTUY models were employed in our estimations. We found that the conditions required by the N = 50 WP significantly overlap with those required by the N = 82 ones, except for the WS4 model. In addition, the upper(or lower) bounds of the n-T9 conditions based on the models are different from each other due to the deviations in the two-neutron separation *** standard deviations in the nuclear mass of 108 isotopes in the three N = 50, 82, and 126 groups are about rms = 0.192 and 0.434 Me V for the pairs of KTUY-AME and WS4-KTUY models,respectively. We found that these mass uncertainties result in a large discrepancy in the nn-T_(9) conditions, leading to significant differences in the conditions for simultaneously appearing all the three peaks in the r-process abundance. The newly updated FRDM and WS4 calculations can give the overall conditions for the appearance of all the peaks but vice versa for their old versions in a previous study. The change in the final r-process isotopic abundance due to the mass uncertainty is from a few factors to three orders of magnitude. Therefore, accurate nuclear masses of the r-process key nuclei, especially for 76 Fe,81Cu,127Rh,132Cd,192Dy, and 197Tm, are highly recommended to be measured in radioactive-ion beam facilities for a better understanding of the r-process evolution.

关键词： neutron capture r-process nuclear mass isotopic abundance precise mass measurement

Breast cancer awareness in reproductive women in the low- and middle-income countries: a scoping review

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

Frontiers of nursing 2024年第2期 139页

作者： Made Satya Nugraha Gautama Saranya Pimolkatekul nguyen ngoc Nhat Thanh

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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

Glucose measurement via Raman spectroscopy of graphene:Principles and operation

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Nano Research 2022年第10期15卷 8697-8704页

作者： Alireza Ahmadianyazdi ngoc Hoang Lan nguyen Jie Xu Vikas Berry Department of Mechanical and Industrial Engineering University of Illinois at ChicagoChicagoIllinois 60607USA Department of Chemical Engineering University of Illinois at ChicagoChicagoIllinois 60607USA

The sensitivity of graphene’s Raman characteristics to external perturbations can be exploited for sensing *** apply this principle,Raman spectroscopy of graphene in contact with a chemical/biological analyte is recorded to unravel a correlation between analyte’s physical/chemical/biological properties and electronic properties(Fermi energy and dopants level)of *** an example,we demonstrate the principle and operation of glucose measurement using graphene’s Raman spectroscopy,utilizing both affinity and enzymatic detection *** the affinity detection,we monitor Raman spectrum of graphene in contact with a glucose containing sample to quantify the attachment of glucose onto 1-pyrene boronic acid(PBA)functionalized *** is revealed that glucose covalent bond to PBA induces n-type doping in graphene and increases its Fermi level following the Hill–Langmuir *** the enzymatic detection,we show that graphene’s Fermi energy shifts due to the biocatalytic oxidation of glucose by immobilized glucose oxidase(GOx)*** a result,graphene becomes p-doped with increasing glucose *** attribute this sensitivity to a re-distribution of ionic charges within the electric double layer(EDL)of graphene upon introducing the glucose *** model explains both our affinity and enzymatic glucose detection *** glucose detection,our graphene Raman spectroscopy-based sensor(GRS)may extend its applications to a broader range of remote and non-invasive detection without the need to employ electronics such as field-effect transistors.

关键词： graphene Raman spectroscopy glucose affinity detection glucose oxidase

Optimizing Bidders Selection of Multi-Round Procurement Problem in Software Project Management Using Parallel Max-Min Ant System Algorithm

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Computers, Materials & Continua 2021年第1期66卷 993-1010页

作者： Dac-Nhuong Le Gia Nhu nguyen arish Garg Quyet-Thang Huynh Trinh ngoc Bao nguyen ngoc Tuan Institute of Research and Development Duy Tan UniversityDa Nang550000Vietnam Faculty of Information Technology Duy Tan UniversityDa Nang550000Vietnam Faculty of Information Technology Haiphong UniversityHaiphong180000Vietnam Graduate School Duy Tan UniversityDa Nang550000Vietnam School of Mathematics Thapar Institute of Engineering and TechnologyPatiala147004India Hanoi University of Science and Technology Hanoi100000Vietnam Hanoi University Hanoi100000Vietnam Department of ICT Ministry of Education and TrainingHanoi100000Vietnam

This paper presents a Game-theoretic optimization via Parallel Min-Max Ant System(PMMAS)algorithm is used in practice to determine the Nash equilibrium value to resolve the confusion in choosing appropriate bidders of multi-round procurement problem in software project *** this end,we introduce an approach that proposes:(i)A Game-theoretic model of multiround procurement problem(ii)A Nash equilibrium strategy corresponds to multi-round strategy bid(iii)An application of PSO for the determination of global Nash *** balance point in Nash Equilibrium can help to maintain a sustainable structure not only in terms of project management but also in terms of future *** an alternative of procuring entities subjectively,a methodology to support decision making has been studied using Nash equilibrium to create a balance point on benefit in procurement where buyers and suppliers need multiple rounds of *** goal focus on the balance point in Nash Equilibrium to optimizing bidder selection in multi-round procurement which is the most beneficial for both investors and selected *** PMMAS algorithm is implemented based on MPI(message passing interface)to find the approximate optimal solution for the question of how to choose bidders and ensure a path for a win-win relationship of all participants in the procurement *** also evaluate the speedup ratio and parallel efficiency between our algorithm and other proposed *** the experiment results,the high feasibility and effectiveness of the PMMAS algorithm are verified.

关键词： Parallel min-max ant system multi-objective multi-round procurement software project management project conflicts Nash equilibrium game theory MPI

Optimum Design for the Magnification Mechanisms Employing Fuzzy Logic-ANFIS

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Computers, Materials & Continua 2022年第12期73卷 5961-5983页

作者： ngoc Thai Huynh Tien V.T.nguyen Quoc Manh nguyen Faculty of Automobile Technology Industrial University of Ho Chi Minh CityHo Chi Minh City70000Vietnam Faculty of Mechanical Technology Industrial University of Ho Chi Minh CityHo Chi Minh City70000Vietnam Faculty of Mechanical Engineering Hung Yen University of Technology and EducationHung Yen160000Vietnam

To achieve high work performance for compliant mechanisms of motion scope,continuous work condition,and high frequency,we propose a new hybrid algorithm that could be applied to multi-objective optimum *** this investigation,we use the tools of finite element analysis(FEA)for a magnificationmechanism to find out the effects of design variables on the magnification ratio of the mechanism and then select an optimal mechanism that could meet design requirements.A poly-algorithm including the Grey-Taguchi method,fuzzy logic system,and adaptive neuro-fuzzy inference system(ANFIS)algorithm,was utilized mainly in this *** FEA outcomes indicated that design variables have significantly affected on magnification ratio of the mechanism and verified by analysis of variance and analysis of the signal to noise of grey relational *** results are also predicted by employing the tool of ANFIS in *** conclusion,the optimal findings obtained:Its magnification is larger than 40 times in comparison with the initial design,the maximum principal stress is 127.89MPa,and the first modal shape frequency obtained 397.45 ***,we found that the outcomes obtained deviation error compared with predicted results of displacement,stress,and frequency are 8.76%,3.6%,and 6.92%,respectively.

关键词： Compliant mechanism grey relational analysis taguchi method multi-objective optimization fuzzy logic system adaptive neuro-fuzzy inference system(ANFIS)

Three-Dimensional Meshfree Analysis of Interlocking Concrete Blocks for Step Seawall Structure

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Computers, Materials & Continua 2021年第1期66卷 165-178页

作者： Hau nguyen-ngoc Hnguyen-Xuan Magd Abdel-Wahab Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde 903B-9052ZwijnaardeBelgium University of Science and Technology The University of DanangDa Nang CityVietnam CIRTech Institute Ho Chi Minh City University of TechnologyHo Chi Minh CityVietnam Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

This study adapts the flexible characteristic of meshfree method in analyzing three-dimensional(3D)complex geometry structures,which are the interlocking concrete blocks of step *** elastostatic behavior of the block is analysed by solving the Galerkin weak form formulation over local support *** 3D moving least square(MLS)approximation is applied to build the interpolation functions of *** pre-defined number of nodes in an integration domain ranging from 10 to 60 nodes is also investigated for their effect on the studied *** accuracy and efficiency of the studied method on 3D elastostatic responses are validated through the comparison with the solutions of standard finite element method(FEM)using linear shape functions on tetrahedral elements and the well-known commercial software,*** results show that elastostatic responses of studied concrete block obtained by meshfree method converge faster and are more accurate than those of standard *** studied meshfree method is effective in the analysis of static responses of complex geometry *** amount of discretised nodes within the integration domain used in building MLS shape functions should be in the range from 30 to 60 nodes and should not be less than 20 nodes.

关键词： Meshfree method local support domain moving least square shape function 3D elastostatic behavior complex geometry

Orange G degradation by heterogeneous peroxymonosulfate activation based on magnetic MnFe_(2)O_(4)/α-MnO_(2) hybrid

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Journal of Environmental Sciences 2023年第2期124卷 379-396页

作者： Le Thi Thao To Van nguyen Van Quy nguyen ngoc Man Phan Ki Jae Kim nguyen Nhat Huy nguyen Trung Dung Faculty of Physical and Chemical Engineering Le Quy Don Technical UniversityHanoi 100000Vietnam Department of Energy Engineering Konkuk UniversitySeoul 05029Korea School of Chemical Engineering College of EngineeringSungkyunkwan UniversityJangan-guSuwon 16419Korea Faculty of Environment and Natural Resources Ho Chi Minh City University of Technology(HCMUT)Ho Chi Minh City 700000Vietnam Vietnam National University Ho Chi Minh City Linh Trung WardThu Duc CityHo Chi Minh City 700000Vietnam

Wastewater containing an azo dye Orange G(OG)causes massive environmental pollution,thus it is critical to develop a highly effective,environmental-friendly,and reusable catalyst in peroxymonosulfate(PMS)activation for OG *** this work,we successfully applied a magnetic MnFe_(2)O_(4)/α-MnO_(2) hybrid fabricated by a simple hydrothermal method for OG removal in *** characteristics of the hybrid were investigated by Xray diffraction,scanning electron microscopy,energy-dispersive X-ray spectroscopy,Fourier transform infrared spectroscopy,Brunauer–Emmett–Teller method,vibrating sample magnetometry,electron paramagnetic resonance,thermogravimetric analysis,and X-ray photoelectron *** effects of operational parameters(i.e.,catalytic system,catalytic dose,solution pH,and temperature)were *** results exhibited that 96.8% of OG degradation was obtained with MnFe_(2)O_(4)/α-MnO2(1:9)/PMS system in 30 min regardless of solution pH ***,the possible reaction mechanism of the coupling system was proposed,and the degradation intermediates of OG were identified by mass *** radical quenching experiments and EPR tests demonstrated that SO_(4)•̶,O_(2)•̶,and 1O2 were the primary reactive oxygen species responsible for the OG *** hybrid also displayed unusual stability with less than 30%loss in the OG removal after four sequential ***,magnetic MnFe2O4/α-MnO2 hybrid could be used as a high potential activator of PMS to remove orange G and maybe other dyes from wastewater.

关键词： MnFe_(2)O_(4)/α-MnO_(2) Peroxymonosulfate Orange G Catalytic degradation Reusability

Surface PEGylation of hollow mesoporous silica nanoparticles via aminated intermediate

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Progress in Natural Science:Materials International 2019年第6期29卷 612-616页

作者： Thi ngoc Tram nguyen Diem-Huong nguyen-Tran Long Giang Bach Tran Hoang Du Truong ngoc Thuy Trang Le Dai Hai nguyen Tra Vinh University Institute of Applied Materials Science Vietnam Academy of Science and Technology Graduate University of Science and Technology Vietnam Academy of Science and Technology nguyen Tat Thanh University 5. Institute of Research and Development Duy Tan University

A hybrid of organic/inorganic system, hollow mesoporous silica nanoparticles functionalized with poly(ethylene glycol), was synthesized in the presence of coupling agent and aminated ends. Doxorubicin(DOX) was used as a model drug to evaluate the effect of PEGylation on the loading capacity and release pattern of the *** with transmission electron microscopy(TEM) and scanning electron microscopy(SEM), X-ray diffraction(XRD), nitrogen adsorption-desorption, thermogravimetric analysis(TGA) and Fourier transformed infrared(FTIR) confirmed the PEG conjugation, as well as the amorphous mesoporous nature of the synthesized particles. Due to the capping effect of PEG molecules over the pores in the silica structure, the synthesized system was able to retain higher amount of cargo and establish a controlled manner when releasing.

关键词： Hollow mesoporous silica nanoparticles mPEG PEGylation Surface modification