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Evaluation of Weathering Performance of Rosin-Copper Based Treated Wood

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Journal of Renewable Materials 2022年第11期10卷 2765-2780页

作者： Thi Thanh Hien Nguyen Nho Quyet Tran Thi minh Nguyet Nguyen Hien mai Trinh Xuan phuong Le Trong Kien Nguyen College of Wood Industry and Interior Design Vietnam National University of ForestryHa NoiViet Nam College of Economics and Management Northeast Forestry UniversityHarbinChina

This study aimed to evaluate the effect of natural weathering on some surface characteristics and mechanical properties of Styrax wood treated with mixtures of 1.0%,2.0%,or 4.0%rosin sizing agent and 3%copper *** samples after treatment were exposed to outdoor conditions for one year and changes in color,glossiness,weight loss,compression strength parallel to grain(CSPG),modulus of rupture(MOR),and modulus of elasticity(MOE)were investigated after 6 and 12-month of natural *** results showed that rosin-copper treatment could improve color stability and gloss of samples after *** losses of all rosin-copper treated samples after 12 months of exposure were negligible compared with the untreated control *** addition,rosin-copper treatment enhanced the CSPG compared to untreated controls,but slightly decreased the MOR and MOE of Styrax wood before *** weathering factors induced a reduction for all strength properties,however,the decrease rate for strength properties of rosin-copper treated samples was negligible compared with the untreated control samples after 12-month natural weathering *** FTIR and SEM-EDX confirmed that the use of the rosin-copper formulations to impregnate wood could decrease the hazard of the copper preservative leaching into the environment,while also enhancing more resistance against weathering factors and other biotic factors.

关键词： Rosin-copper weathering color stability CSPG MOR MOE

A Life-cycle Assessment on the Environmental Impacts of Photovoltaic Panels in Vietnam ——A Case Study in TTC Krongpa Plant

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A Life-cycle Assessment on the Environmental Impacts of Phot...

作者： Bui mai phuong Thao 中国石油大学(北京)

学位级别：硕士

Solar power is undergoing rapid change in its production,performance and *** a high average annual radiation volume due to its geographical location situated in the sub-equatorial region,Vietnam has much potential for the development of solar ***,there is a significant change in solar energy industry which is the geographical shift in solar panel *** panel factories are being built more and more in Asian countries,including *** is necessary to conduct an in-depth evaluation to assess the potential environmental effects of the photovoltaic（PV）panel life-cycle in Vietnam,including raw materials extraction and manufacturing,transportation,as well as its operation,maintenance,and recycling or disposal over its *** assessment will make a substantial contribution to the evolution of the solar power sector in *** study aims to analyze the development of Vietnam photovoltaic systems,and propose an all-inclusive method to evaluate the environmental impacts of PV panels life cycle from *** study chose the TTC Krongpa solar plant in Vietnam as a case-study plant to *** life cycle assessment（LCA）method was used to assess impacts of PV cell life-cycle on the environment with the help of Open LCA *** Energy Demand methodology was used in the system to determine the CED value,which was important for determining *** IPCC GWP 20a and IPCC GWP 100a methods were used to analyzed the GWP over the periods of 20 and *** this study,the environmental impacts were assessed by utilizing the IMPACT2002+approach,which evaluated both midpoints and endpoints for each *** assessment was conduct by TRACI 2.1 and Recipe 2016 methodologies to make a broader *** the study,the cumulative energy demand（CED）and the mean energy pay back time（EPBT）of the system were obtained as the value of 9740.51 MJ and 6.5 years,*** global warming potential（GWP）was

关键词： Solar Power Photovoltaic Panel Life Cycle Assessment Vietnam

Antibiofilm activity of a-mangostin extracted from Garcinia mangostana L. against Staphylococcus aureus

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Asian Pacific Journal of Tropical Medicine 2017年第12期10卷 1154-1160页

作者： Nguyen Thi mai phuong Ngo Van Quang Ta Thu mai Nguyen Vu Anh Chutima Kuhakarn Vichai Reutrakul Albert Bolhuis Institute of Biotechnology Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadHanoiViet Nam Graduate University of Science and Technology Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadHanoiViet Nam Institute of Chemistry Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadHanoiViet Nam Center of Excellence for Innovation in Chemistry and Department of Chemistry Faculty of ScienceMahidol UniversityRama 6 RoadBangkok 10400Thailand Department of Pharmacy and Pharmacology University of BathClaverton Down BathBA2 7AYBathUK

Objective: To isolate a-mangostin(AMG) from the peels of mangosteen(Garcinia mangostana L.), grown in Vietnam, and to investigate antibiofilm activity of this compound against three Staphylococcus aureus(S. aureus) strains, one of which was methicillin-resistant S. aureus(MRSA) and the other two strains were methicillinsensitive S. aureus(MSSA).Methods: AMG in n-hexane fraction was isolated on a silica gel column and chemically analyzed by HPLC and NMR. The antibiofilm activity of this compound was investigated by using a 96-well plate model for the formation of biofilms. Biofilm biomass was quantified using crystal violet. The viability of cells was observed under confocal microscopy using LIVE/DEAD Bac Light stains. Biofilm composition was determined using specific chemical and enzyme tests for polysaccharide, protein and DNA. Membranedamaging activity was assayed by measuring the hemolysis of human red blood cells in presence of ***: The results indicated that the isolated AMG, with a purity that exceeded 98%,had minimal inhibitory concentrations in the range of 4.6–9.2 mmol/L for the three strains tested. Interestingly, the MSSA strains were more sensitive to AMG than the MRSA strain. Minimal bactericidal concentrations were 2-fold higher than the minimal inhibitory concentration values for the three strains, indicating that AMG was a bactericidal compound. AMG also prevented biofilm formation effectively, albeit that again the MRSA strain was the most resistant. Interestingly, biofilms of the MRSA strain contained protein as a main component of the extracellular matrix, whereas this was polysaccharide in the MSSA strains. This might relate to the resistance of the MRSA 252 strain to *** using human red blood cells indicated that AMG caused significant membrane damage with 50% of cell lysis occurred at concentration of about 36 mmol/***: Our results provide evidence that the isolated AMG has inhibitory activity against biofilm formation

关键词： α-Mangostin Garcinia mangostana Biofilms Methicillin resistance Staphylococcus aureus

Successful containment of a COVID-19 outbreak in Bach mai Hospital by prompt and decisive responses

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Asian Pacific Journal of Tropical Medicine 2021年第5期14卷 234-235页

作者： Van minh Hoang Thi phuong Thao Tran Thi Ngoc phuong Nguyen Thi Hai Yen Nguyen Quang Tuan Nguyen Hanoi University of Public Health HanoiVietnam Bach mai Hospital HanoiVietnam

In low-and middle-income countries,tertiary care hospitals frequently face an extremely heavy workload and shoulder an even heavier burden during the COVID-19 *** mai Hospital(BMH),one of the leading tertiary hospitals in Vietnam,is on the frontline in the fierce battle against *** letter aims to describe how BMH tackles the COVID-19 outbreak in the hospitallevel battle,which could support policymakers in time-management and well-preparation for this unpredictable pandemic.

关键词： prompt income policy

Anticaries and antimicrobial activities of methanolic extract from leaves of Cleistocalyx operculatus L.

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Asian Pacific Journal of Tropical Biomedicine 2017年第1期7卷 43-48页

作者： phuong Thi mai Nguyen Nadin Schultze Christin Boger Zeyad Alresley Albert Bolhuis Ulrike Lindequist Department of Plant Biochemistry Institute of BiotechnologyVietnam Academy of Science and Technology Institute of Pharmacy University of Greifswald Department of Pharmacy and Pharmacology University of Bath

Objective: To investigate antimicrobial activities of methanolic extract of leaves of Cleistocalyx operculatus L.(C. operculatus) grown in ***: The methanolic extract of C. operculatus leaves was phytochemically screened and tested for its antimicrobial activity against six Gram-positive bacteria(three of which were antibiotic multiresistant Staphylococcus spp.), two Gram-negative bacteria,and one fungal species using an agar diffusion method. Anticaries activity was tested using p H drop and biofilm assays formed in 96-well plastic ***: Phytochemical screening revealed the presence of flavonoids and terpenes, in which flavonoid content was 6.8 mg/g dry material. Antibacterial activity of the C. operculatus extract was shown only against Gram-positive bacteria Staphylococcus aureus, Bacillus subtilis and Streptococcus mutans GS-5(S. mutans), and three multiresistant bacteria being Staphylococcus epidermidis 847, Staphylococcus haemolyticus 535 and Staphylococcus aureus North German epidemic strain. Interestingly, methanolic extract of C. operculatus leaves exhibited the anticaries activity against S. mutans in terms of inhibition of acid production and biofilm formation. Activity of two key enzymes responsible for acidogenicity of S. mutans, F-ATPase and phosphotransferase system were inhibited by the extract with IC_(50) of 51.0 and 98.0 m g/m L, respectively. Cytotoxicity of the extract against keratinocytes was found only for higher concentrations [IC_(50)=(119.98 ± 4.63) m g/m L].Conclusions: The methanolic extract of C. operculatus leaves has the potential for development of antimicrobial preparations, especially anticaries products.

关键词： Cleistocalyx operculatus Antibacterial activity Anticaries Cytotoxicity

Viral co-infections among children with confirmed measles at hospitals in Hanoi,Vietnam,2014

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Asian Pacific Journal of Tropical Medicine 2017年第2期10卷 164-167页

作者： Hang Le Khanh Nguyen Loan phuong Do Van Thanh Thi Trieu Son Vu Nguyen phuong Vu mai Hoang Hien Thi Pham Thanh Thi Le Huong Thi Thu Tran Cuong Duc Vuong mai Thi Quynh Le National Institute of Hygiene and Epidemiology No 1-Yesrsin streetHanoiVietnam

Objective:To characterize viral co-infections among representative hospitalized measles cases during the 2014 Hanoi ***:Throat swabs were collected from 54 pediatric patients with confirmed measles,and molecular diagnostics performed for 10 additional viral respiratory pathogens(Influenza A/H1N1pdm09;A/H3N2 and influenza B;Parainfluenza 1,2,3;Respiratory Synctial Virus,RSV;human Metapneumovirus,hM PV;Adenovirus and Picornavirus).Results:Twenty-one cases(38.9%) showed evidence of infection with other respiratory viruses:15 samples contained measles plus one additional virus,and 6 samples contained measles plus 2 additional *** was detected as a predominant cause of co-infections(13 cases;24.1%),followed by RSV(6 cases;11.1%),A/H1N1pdm09(3 cases;5.6%),PIV3(3 cases;3.7%),Rhinovirus(3 cases;3.7%) and hM PV(1 case;1.96%).Conclusions:Viral co-infections identified from pediatric measles cases may have contributed to increased disease severity and high rate of fatal *** treatment of measles cases may require control of multiple viral respiratory pathogens.

关键词： Measles virus Respiratory viruses Co-infection

Parity 3 or More at Haiphong Hospital of Obstetrics and Gynecology in 2016

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Journal of Health Science 2018年第2期6卷 91-99页

作者： Nguyen Thi mai phuong Haiphong University of Medicine and Pharmacy Hai Phong 180000 Viet Nam

Background： Although increasing parity increased the risk of pregnancy complications and despite of Vietnam’s family planning policy of two-child, the percent of women having three or more children has tended for five years. Objectives：（1） Find out the prevalence of parity ≥ 3 and their reasons at Haiphong Hospital of Obstetrics and Gynecology in 2016; （2） Describe the methods of labor and its adverse outcomes. Materials and methods： A cross-sectional in 485 women had delivered three or more infants at Haiphong Hospital of Obstetrics and Gynecology from June to August, 2016. Results： The prevalence of parity ≥ 3 is 11.9%, no relation to geopraphy, education and career. The main reasons are unplanned pregnancy and desire to have a baby boy. The sex ratio at birth is 162. The proportion of cesarean delivery is 53.4%, in which is due to an old C-section. Conclusion： serious gender is imbalance among women having three or more baby （162 baby boys per hundred baby girls）.

关键词： Parity 3 or more sex ratio at birth Haiphong Hospital of Obstetrics and Gynecology.

Oxygen functionalization-assisted anionic exchange toward unique construction of flower-like transition metal chalcogenide embedded carbon fabric for ultra-long life flexible energy storage and conversion

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Carbon Energy 2024年第1期6卷 72-93页

作者： Roshan M.Bhattarai Kisan Chhetri Nghia Le Debendra Acharya Shirjana Saud mai Cao Hoang phuong Lan Nguyen Sang Jae Kim Young Sun Mok Department of Chemical Engineering Jeju National UniversityJejuRepublic of Korea Department of Nano Convergence Engineering Jeonbuk National UniversityJeonjuRepublic of Korea Regional Leading Research Center(RLRC)for Nanocarbon-based Energy Materials and Application Technology Jeonbuk National UniversityJeonjuRepublic of Korea Department of Chemistry Mississippi State UniversityStarkvilleMississippiUSA Nanomaterials and System Laboratory Department of Mechatronics EngineeringJeju National UniversityJejuRepublic of Korea

The metal-organic framework(MOF)derived Ni–Co–C–N composite alloys(NiCCZ)were“embedded”inside the carbon cloth(CC)strands as opposed to the popular idea of growing them upward to realize ultrastable energy storage and conversion *** NiCCZ was then oxygen functionalized,facilitating the next step of stoichiometric sulfur anion diffusion during hydrothermal sulfurization,generating a flower-like metal hydroxysulfide structure(NiCCZOS)with strong partial implantation inside *** obtained NiCCZOS shows an excellent capacity when tested as a supercapacitor electrode in a three-electrode ***,when paired with the biomass-derived nitrogen-rich activated carbon,the asymmetric supercapacitor device shows almost 100%capacity retention even after 45,000 charge–discharge cycles with remarkable energy density(59.4 Wh kg^(-1)/263.8μWh cm^(–2))owing to a uniquely designed ***,the same electrode performed as an excellent bifunctional water-splitting electrocatalyst with an overpotential of 271 mV for oxygen evolution reaction(OER)and 168.4 mV for hydrogen evolution reaction(HER)at 10 mA cm−2 current density along with 30 h of unhinged chronopotentiometric stability performance for both HER and ***,a unique metal chalcogenide composite electrode/substrate configuration has been proposed as a highly stable electrode material for flexible energy storage and conversion applications.

关键词： carbon cloth energy conversion energy storage flexible metal embedding ultra-stable

The Genetic Relationship of Vietnamese Pigs in Central Highlands Assessed by Cytochrome b

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Open Journal of Genetics 2014年第5期4卷 362-369页

作者： Le Thanh Long Nguyen Thi phuong mai Doan Chinh Chung Do minh Si Ho Nguyen Quynh Chi Hoang Nghia Son Institute of Tropical Biology Viet Nam Academy of Science and Technology Ho Chi Minh City Vietnam Tay Nguyen Institute for Scientific Research Viet Nam Academy of Science and Technology Da Lat City Vietnam University of Science Ho Chi Minh City Vietnam

To estimate the genetic relationship of Vietnamese pigs in Central Highlands, we compared cytochrome b sequences of Vietnamese wild boars and Vietnamese domestic pigs with other Asian and European wild boars. The results showed that there were two wild boar populations locating in Vietnam Central Highlands including wild boars of group I and wild boars of group II. The Vietnamese wild boars of group II and domestic pigs were genetically close to Asian A1 and Asian A2 wild boar groups, whereas the Vietnamese wild boars of group I were genetically distinct from Asian A1, Asian A2 wild boar groups. The phylogenetic tree demonstrated that the Vietnamese wild boars of group I were clustered in one clade which was distinct from Asian wild boars and Europe wild boars. In addition, the Vietnamese wild boars of group I were estimated to have diverged from European wild boars at 421500 YBP, indicating that Vietnamese wild boar of group I could be isolated from other Asian wild boars. The single nucleotide polymorphism analysis showed that three Asian haplotypes were contributed in Vietnamese wild boars including A3 (TATG) haplotype in Vietnamese wild boar of group I and A1 (CATA) haplotype and A2 (CATG) haplotype in Vietnamese wild boars of group II. The A1 haplotype and A2 haplotype were also distributed in Vietnamese domestic pigs. Thus, there is a high possibility that Vietnam Central Highlands is a principal source for research on genetic diversity in Asian wild boar and domestic pig populations.

关键词： Cytochrome b Domestic Pig Genetic Relationship Vietnam Central Highlands Wild Boar