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Use of light-emitting diode(LED)lamps in combination with metal halide(MH)lamps reduce fuel consumption in the Vietnamese purse seine fishery

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Aquaculture and Fisheries 2021年第4期6卷 432-440页

作者： Khanh Q.Nguyen phu D.tran Luong T.Nguyen phuong V.To Corey J.Morris Nha trang University 2 Nguyen Dinh ChieuNha TrangViet Nam Fisheries and Oceans Canada St.John’sNL A1C 5X1Canada

The use of high-power lights during night-time purse seining is common in ***,metal halide(MH)lamps are used in the commercial fishery to attract fish,however these lights require more energy,have a shorter lifespan,and lower chromatic performance than light emitting diode(LED)*** study examined catch efficiency and fuel consumption when using LED lamps in combination with reduced numbers of MH lamps(10.24 kW),compared to conventional lighting(28.6 kW),used during purse seining off the coast of Ninh Thuan province,*** economic performance associated with using LED lamps in this fishery was also *** found no significant differences in catch rates between the different light treatments,however fuel consumption was significantly *** consumption per nightly trip using LED with MH lamps was 70.8 l(11.1 l/h)compared to114 l(17.45 l/hr)using MH lamps alone,an estimated 37.9%reduction in fuel *** investment in LED lamps by a fishing enterprise will require additional initial costs,however our analysis revealed the financial break-event point can be reached after approximately 101 nightly trips when the fuel price is at the 2015 level of USD$0.74 per *** enterprises can increase their profitability,and reduce CO2 emissions,by using LED lamps in the Vietnamese purse seine fishery.

关键词： LED light Purse seine fishery Fuel consumption Catch comparison Economic efficiency

Development of 24 and 59 keV Filtered Neutron Beams for Neutron Capture Experiments at Dalat Research Reactor

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World Journal of Nuclear Science and Technology 2014年第2期4卷 59-64页

作者： Pham Ngoc Son Vuong Huu Tan phu Chi Hoa tran Tuan Anh Nuclear Research Institute Dalat Vietnam The University of Dalat Dalat Vietnam Vietnam Agency for Radiation and Nuclear Safety Hanoi Vietnam

External filtered neutron beams have been developed at the horizontal radial channels No. 4 of Dalat research reactor. In the material composition of the neutron filters, the primary material components of Iron, Aluminum, Nickel and Vanadium are used to obtain the mono-energetic neutron beams of 24 and 59 keV, with low level of Gamma and slow neutron background. A computer code and Monte-Carlo simulation technique were applied to optimize the filter configurations and to deduce the neutron energy distributions in the filtered beams. A hydrogen-filled proton recoil detector and the activation method with Gold foils were used to measure the neutron energy spectrum and flux of each beam at sample position. The results of experimental neutron fluxes are 6.1 × 105 and 5.3 × 105 n/cm2/s for 24 and 59 keV beams, respectively.

关键词： Research Reactor Filtered Neutron 24 keV 59 keV

Characteristics of Filtered Neutron Beam Energy Spectra at Dalat Reactor

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World Journal of Nuclear Science and Technology 2014年第2期4卷 96-102页

作者： tran Tuan Anh Pham Ngoc Son Vuong Huu Tan Pham Dinh Khang phu Chi Hoa Nuclear Research Institute Dalat Vietnam The University of Dalat Dalat Vietnam Vietnam Agency for Radiation and Nuclear Safety Hanoi Vietnam

Filtered neutron technique was applied for producing quasi-monoenergetic neutron beams of 24 keV, 54 keV, 133 keV and 148 keV at the horizontal neutron channel No. 4 of the Dalat Nuclear Research Reactor. The study on physical characteristics of these beam lines has been carried out for efficient applications in neutron capture experiments. The filtered neutron spectrum of each beam has been simulated by Monte-Carlo method and experimentally measured by a gas-filled protonrecoil spectrometer. The neutron fluxes of these filtered beams were measured by the activation technique with standard foils of 197Au, using a high efficient HPGe digital gamma-ray spectrometer.

关键词： Neutron Filter Proton-Recoil

Biventricular pulsus alternans: An echocardiographic finding in patient with pulmonary embolism

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World Journal of Clinical Cases 2013年第5期1卷 162-165页

作者： tin Nguyen Long-Bao Cao Minh tran Assad Movahed Department of Cardiovascular Sciences East Carolina UniversityBrody School of Medicine East Carolina Heart Institute Greenville NC 27834 United States

Pulsus alternans is characterized by regular rhythm with beat-to-beat alternation of systolic pressures. Left ventricular alternans is usually found in severe left ventricular dysfunction due to cardiomyopathy, coronary artery disease, systemic hypertension, and aortic stenosis. Right ventricular alternans is usually associated with left ventricular alternans, right ventricular dysfunction, pulmonary embolism, and pulmonary hypertension. Biventricular alternans is rare and associated with severe left ventricular dysfunction and left anterior descending coronary artery disease. The exact mechanism of pulsus alternans has not been clearly delineated, and it has been remained a subject of investigation and conjecture since the nineteenth century. Two fundamental mechanisms have been proposed to explain ventricular alteration. The first, based on the Frank-Starling mechanism, proposes beat-to-beat alteration in end-diastolic volume accounted for the alternating contractile force. The second proposed mechanism which explains the physiology of pulsus alternans involves the abnormal calcium handling by cardiac myocytes. To the best of our knowledge, biventricular alternans in pulmonaryembolism has not been previously reported in the medical literature. We present and discuss the mechanisms of pulsus alternans and its clinical implications.

关键词： Pulsus alternans Biventricular alternans Pulmonary embolism

AN EXTENSION OF ZOLOTAREV'S PROBLEM AND SOME RELATED RESULTS

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Acta Mathematica Scientia 2021年第5期41卷 1619-1634页

作者： tran Loc HUNG Phan Tri KIEN University of Finance and Marketing 77 Nguyen Kiem StreetPhu Nhuan DistrictHo Chi Minh CityVietnam

The main purpose of this paper is to extend the Zolotarev's problem concerning with geometric random sums to negative binomial random sums of independent identically distributed random *** extension is equivalent to describing all negative binomial infinitely divisible random variables and related *** Trotter-operator technique together with Zolotarev-distance's ideality,some upper bounds of convergence rates of normalized negative binomial random sums(in the sense of convergence in distribution)to Gamma,generalized Laplace and generalized Linnik random variables are *** obtained results are extension and generalization of several known results related to geometric random sums.

关键词： Zolotarev's problem geometric random sum negative binomial random sum negative binomial infinitely divisibility Trotter-operator technique

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High-dose methylprednisolone pulse therapy for the treatment of patients with severe COVID-19: Results from a prospective observational study

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Journal of Intensive Medicine 2022年第3期2卷 197-198页

作者： Thinh N.Bui Hoang-Anh Ngo Nhat M.Huynh Nguyen-Huy Do-tran Lac Duy Le Thu-Anh Nguyen COVID-19 Intensive Care Unit 2 Thu Duc City HospitalThu Duc CityHo Chi Minh CityTam Phu 721400Vietnam Woolcock Institute of Medical Research 298 Kim MaBa DinhHanoi 118000Vietnam Usher Institute Old Medical SchoolUniversity of EdinburghEdinburgh EH89AGUnited Kingdom School of Medicine Vietnam National UniversityDong HoaHo Chi Minh CityDi AnBinh Duong 590000Vietnam Sydney School of Medicine The Faculty of Medicine and HealthThe University of SydneyCamperdownNSW 2050Australia

To the Editor:Recent randomized controlled trials,as well as high-quality systematic reviews and meta-analyses,strongly support the use of corticosteroids in patients with coronavirus disease 2019(COVID-19)who require oxygen support.[1]The use of pulse cor-ticosteroid therapy has been reported in case series and studies,showing significant improvement in patients and a reduction in mortality rate.[2]In this letter,we report the mortality rate among patients with severe COVID-19 receiving pulse corticos-teroids with methylprednisolone(500 mg/day)for≥3 days and≥24 h before intubation(median duration of therapy:3 days)compared with standard of care.

关键词： patients mortality therapy

Assessment of Livelihood Vulnerability to Drought: A Case Study in Dak Nong Province, Vietnam

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International Journal of Disaster Risk Science 2019年第4期10卷 604-615页

作者： Nguyen Thi Thanh Thao Dao Nguyen Khoi tran Thanh Xuan Bernard Tychon Universite de Liege 6700 ArlonBelgium Institute for Environmental Science Engineeringand ManagementIndustrial University of Ho Chi Minh CityHo Chi Minh CityVietnam Institute of Research and Development Duy Tan UniversityDa NangVietnam Faculty of Environment University of ScienceVietnam National University Ho Chi Minh CityHo Chi Minh CityVietnam NTT Institute of Hi-Technology Nguyen Tat Thanh UniversityHo Chi Minh CityVietnam

In recent years,droughts have strongly affected the Central Highlands of Vietnam and have resulted in crop damage,yield decline,and serious water *** study investigated the livelihood vulnerability of five communities of farmers who are exposed to droughts in one of the more vulnerable regions of Vietnam—Dak Nong Province.A survey of 250 households was conducted in the five communities to collect data on the region’s sociodemographic profile,livelihood systems,social networks,health status,food and water security,drought conditions,and climate *** were aggregated using a livelihood vulnerability index and the IPCC vulnerability *** survey results indicate that Quang phu community is the most vulnerable of the study’s communities,followed by Nam N’dir,Dak Nang,Duc Xuyen,and Dak D’ro in descending order of *** availability and livelihood strategies are the most important variables in determining the vulnerability of the five surveyed *** order to reduce vulnerability to droughts,water management practices and livelihood diversification in farming and nonfarming activities are recommended for the study area.

关键词： Agricultural drought Livelihood vulnerability Vietnam Vulnerability indicators

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Plasmonic Ag‑Decorated Few‑Layer MoS2 Nanosheets Vertically Grown on Graphene for Efficient Photoelectrochemical Water Splitting

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Nano-Micro Letters 2020年第12期12卷 159-172页

作者： Dong‑Bum Seo tran Nam Trung Dong‑Ok Kim Duong Viet Duc Sungmin Hong Youngku Sohn Jong‑Ryul Jeong Eui‑Tae Kim Department of Materials Science and Engineering Chungnam National UniversityDaejeon 34134Republic of Korea Department of Chemistry Chungnam National UniversityDaejeon 34134Republic of Korea

A controllable approach that combines surface plasmon resonance and twodimensional(2D)graphene/MoS2 heterojunction has not been implemented despite its potential for efficient photoelectrochemical(PEC)water *** this study,plasmonic Ag-decorated 2D MoS2 nanosheets were vertically grown on graphene substrates in a practical large-scale manner through metalorganic chemical vapor deposition of MoS2 and thermal evaporation of *** plasmonic Ag-decorated MoS2 nanosheets on graphene yielded up to 10 times higher photo-to-dark current ratio than MoS2 nanosheets on indium tin *** significantly enhanced PEC activity could be attributed to the synergetic effects of SPR and favorable graphene/2D MoS2 *** Ag nanoparticles not only increased visible-light and near-infrared absorption of 2D MoS2,but also induced highly amplified local electric field intensity in 2D *** addition,the vertically aligned 2D MoS2 on graphene acted as a desirable heterostructure for efficient separation and transportation of photo-generated *** study provides a promising path for exploiting the full potential of 2D MoS2 for practical large-scale and efficient PEC water-splitting applications.

关键词： Photoelectrocatalysis Molybdenum disulfide Graphene Surface plasmon resonance

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Influence of Chitosan Binder on the Adhesion of Silver Nanoparticles on Cotton Fabric and Evaluation of Antibacterial Activity

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Advances in Nanoparticles 2015年第4期4卷 98-106页

作者： Nguyen Quoc Hien Dang Van phu Nguyen Ngoc Duy Le Anh Quoc Nguyen T. Kim Lan Hoang T. Dong Quy Huynh T. Hong Van Phan Ha Nu Diem tran Thai Hoa Research and Development Center for Radiation Technology Vietnam Atomic Energy Institute Ho Chi Minh City Vietnam University of Science Vietnam National University in Ho Chi Minh City Ho Chi Minh City Vietnam College of Science Hue University Hue City Vietnam

Colloidal silver nanoparticles (AgNPs) with particle size less than 10 nm and concentration of 2 mM/L (~200 mg/L) were synthesized by gamma Co-60 ray irradiation of Ag+/chitosan solutions with different chitosan concentration of 0.5%, 1% and 2% (w/v). Incorporation of AgNPs onto cotton fabric was carried out by padding method with 100% wet pick-up. The content of AgNPs deposited on cotton fabric and released from cotton fabric after repeated washing was determined by inductively couple plasma-atomic emission spectroscopy (ICP-AES). The results indicated that cotton/AgNPs fabric made from padding into AgNPs solution with 0.5% - 1% chitosan was the best one of AgNPs adhesion ability on cotton fabric. Results on antibacterial activity against S. aureus showed that cotton/AgNPs fabric with AgNPs content more than 100 mg/kg exhibited highly antibacterial activity (η > 98%). The mechanical property (tensile strength and elongation) of cotton/AgNPs fabrics was almost unchanged in comparison with untreated cotton fabric. Thus, the resultant cotton/AgNPs fabric with highly antibacterial activity can be potentially used as bed drapes and/or patient uniforms in hospitals, etc.

关键词： Gamma Co-60 Ray Silver Nanoparticles Chitosan Cotton Fabric Antibacterial