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  • 1
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2018
    In:  Environmental Earth Sciences Vol. 77, No. 18 ( 2018-9)
    In: Environmental Earth Sciences, Springer Science and Business Media LLC, Vol. 77, No. 18 ( 2018-9)
    Type of Medium: Online Resource
    ISSN: 1866-6280 , 1866-6299
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2018
    detail.hit.zdb_id: 2493699-6
    SSG: 13
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  • 2
    In: Journal of Vietnamese Environment, Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden, Vol. 8, No. 2 ( 2016-11-01), p. 102-106
    Abstract: Dissolved Inorganic Carbon (DIC) is one of the main chemical components in water and very sensitive with environmental changes. DIC content in river water closely relates with natural weathering process and human activities in the whole basin. Therefore, DIC concentration reflects the impact of natural conditions and human activities in the basin to river water quality. This paper presents the survey results of the DIC concentrations at 4 sites in the Red River system during the period from January 2008 to December 2015 and simultaneously considers the relationship between some environmental variables and the DIC concentrations in the river water. The survey results showed that the DIC concentrations in the Red River water varied from 9.1 to 29.9 mgC.L-1, averaging 19.6 mgC.L-1 during the study period. The DIC concentrations are positively correlated with pH values and some major ions concentrations in river water, such as K+, Na+, Ca2+, SO42- but negatively correlated with water temperature. These relationships also indicate that the DIC concentrations in the Red River water are influenced by natural conditions, rather than by human activities in the river basin. Cacbon vô cơ hòa tan (DIC) là thành phần hóa học cơ bản trong nước và rất nhạy cảm với những thay đổi của các yếu tố môi trường. DIC có mối liên hệ chặt chẽ với sự phong hóa tự nhiên và các hoạt động của con người trên quy mô toàn lưu vực. Do đó, DIC phản ánh mức độ tác động của các điều kiện tự nhiên và con người trong lưu vực tới chất lượng nước sông. Bài báo trình bày kết quả quan trắc hàm lượng DIC trong nước sông Hồng, đồng thời xem xét mối quan hệ giữa một số yếu tố môi trường với hàm lượng DIC trong nước sông trong giai đoạn 1/2008 – 4/2015. Kết quả cho thấy hàm lượng DIC trong nước sông Hồng dao động trong khoảng 9,1 to 29,9 mgC.L-1, trung bình đạt 19,6 mgC.L-1 trong giai đoạn tháng 1 năm 2008 – tháng 12 năm 2015. Hàm lượng DIC có mối tương quan theo tỷ lệ nghịch với nhiệt độ nước sông; đồng thời có mối tương quan tỷ lệ thuận với giá trị pH và hàm lượng một số ion như K+, Na+, Ca2+, SO42-... tại 4 vị trí quan trắc trên sông Hồng. Các mối quan hệ này thể hiện rằng hàm lượng DIC trong nước sông Hồng chịu ảnh hưởng chính của các đặc điểm tự nhiên hơn là các tác động của con người trong lưu vực.
    Type of Medium: Online Resource
    ISSN: 2193-6471
    URL: Issue
    Language: Unknown
    Publisher: Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden
    Publication Date: 2016
    detail.hit.zdb_id: 2674408-9
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  • 3
    Online Resource
    Online Resource
    Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden ; 2018
    In:  Journal of Vietnamese Environment Vol. 9, No. 4 ( 2018-08-08), p. 217-222
    In: Journal of Vietnamese Environment, Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden, Vol. 9, No. 4 ( 2018-08-08), p. 217-222
    Abstract: Ba Vi National Park, one of 28 Vietnamese National Parks, is currently preserved and exploited for a variety of purposes, including the preservation of intact natural forest ecosystems and genetic resources of rare plants and animals. This paper presents the monitoring results of microbial contamination in surface water environment of the Ba Vi National Park (Ha Noi) in the period 2013-2014 and 2018. The results showed that total coliform (TC) density varied from 23 to 11,000 MPN/100ml in bimonthly observation in 2013-2014 which was lower than that one of sampling campaign in 2018, from 900 MPN/100ml to 8,100 MPN/ml. Fecal coliform (FC) densities varied from 0 to 110 MPN/100ml in 2013-2014, lower than in 2018, when it varied from 0 MPN/100ml to 600 MPN/100ml. At several observation times, both TC and FC were higher than the allowable values of the Vietnam national technical regulation QCVN 08-MT: 2015/BTNMT column A1 for surface water quality. The exceeded values of TC and FC than the allowable values and the increase trend from the 2013 to 2018 periods indicated the potential risks to the public health in this region when people use water for domestic and agricultural purposes. Our results provide dataset for environmental management in the Ba Vi National Park in order to protect the eco-environment in parallel with social-economic development. Vườn Quốc gia Ba Vì, một trong 28 vườn quốc gia của Việt Nam hiện đang được bảo tồn và khai thác cho nhiều mục đích, trong đó có bảo tồn nguyên vẹn các hệ sinh thái rừng tự nhiên, các nguồn gen động, thực vật quý hiếm, các đặc sản rừng và các di tích lịch sử, cảnh quan tự nhiên trong vùng. Bài báo trình bày kết quả quan trắc, đánh giá mức độ ô nhiễm vi sinh vật trong môi trường nước mặt tại Vườn Quốc Gia Ba Vì, Hà Nội giai đoạn 2013-2014 và 2018. Kết quả cho thấy mật độ coliform tổng số (TC) biến đổi trong khoảng từ 23 – 11.000 MPN/100ml trong các đợt quan trắc định kỳ 2 tháng/lần trong hai năm 2013 - 2014 và trong khoảng từ 900 – 8.100 MPN/100ml trong một đợt quan trắc năm 2018. Mật độ fecal coliform (FC) biến đổi trong khoảng từ 0 - 110 MPN/100ml năm 2013 -2014 và từ 0 - 600 MPN/100ml vào năm 2018. Vào một số thời điểm quan trắc, mật độ FC và TC vượt giá trị cho phép của quy chuẩn kỹ thuật Quốc Gia QCVN 08-MT:2015/BTNMT cột A1 về chất lượng nước mặt. Các giá trị TC và FC vượt quá giá trị cho phép và xu hướng gia tăng TC và FC từ 2013 -2018 cho thấy nguy cơ tiềm tàng khi người dân sử dụng nguồn nước này cho các mục đích sinh hoạt và nông nghiệp. Như vậy, kết quả của nghiên cứu này nhấn mạnh nhu cầu giám sát thường xuyên chất lượng nước và cần thực hiện các giải pháp hiệu quả để xử lý và quản lý nguồn gây ô nhiễm trong khu vực nhằm bảo vệ môi trường sinh thái song song với phát triển kinh tế - xã hội của khu vực.
    Type of Medium: Online Resource
    ISSN: 2193-6471
    URL: Issue
    Language: Unknown
    Publisher: Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden
    Publication Date: 2018
    detail.hit.zdb_id: 2674408-9
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  • 4
    In: Journal of Electronic Materials, Springer Science and Business Media LLC, Vol. 48, No. 1 ( 2019-1), p. 662-668
    Type of Medium: Online Resource
    ISSN: 0361-5235 , 1543-186X
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
    detail.hit.zdb_id: 2032868-0
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  • 5
    In: Natural Product Communications, SAGE Publications, Vol. 13, No. 11 ( 2018-11), p. 1934578X1801301-
    Abstract: Sixteen lanostane-type triterpeneoids were isolated from the fruiting bodies of wild Ganoderma lucidum and G. multipileum. The new structures 3 S,24 S,25,26-tetrahydroxy-5α-lanost-8-en-11-one (1) and ganodermanondiol 24,25-acetonide (10) were elucidated by means of spectroscopic data and Mosher's experiments. Lanosta-7,9(11)-dien-3β-ol (9) strongly inhibited α-glucosidase with the IC 50 values of 198.8 μM in compared with acarbose (IC 50 712.4 μM).
    Type of Medium: Online Resource
    ISSN: 1934-578X , 1555-9475
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2430442-6
    SSG: 15,3
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  • 6
    Online Resource
    Online Resource
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2017
    In:  Tạp chí Khoa học và Công nghệ biển Vol. 17, No. 4B ( 2017-12-15), p. 183-197
    In: Tạp chí Khoa học và Công nghệ biển, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 17, No. 4B ( 2017-12-15), p. 183-197
    Abstract: In this article, by combining/following previous publications, we summarize the history of nearly 100 years of development of the Vietnam seismological network and its achievements in earthquake monitoring and seismological research to contribute to prevention and mitigation of natural disasters and sustainable development of the country. Earthquake observation in Vietnam has gone through many stages of development, the first seismic station was established in Sapa by the French in 1924. In the years of  70-80s of the 20th Century, the earthquake monitoring network of Vietnam consisted of 7 stations, including five stations distributed in the Northern part (Phu Lien, Sa Pa, Bac Giang, Hoa Binh, Tuyen Quang) and two stations located in the south (Nha Trang and Da Lat). In the period from 1990 to 2005, the national seismological network with 24 digital seismographs and short-period sensors was created and distributed throughout the country. Today, earthquake monitoring in Vietnam has made great progress, the new seismological network with 30 broadband stations with advanced earthquake monitoring technology been established completely in 2017. The international cooperation on earthquake monitoring and seismological research is  always promoted and expanded, over the past 60 years, IGP has collaborated with many scientific organizations from different countries such as Russia, France, China, Japan, Poland, The United State of America,... and prestigious international organizations as UNDP, PTWC, CTBTO, IRIS, ADPC, RIMES,.. Through these cooperations, many research projects have been done and Vietnamese seismologists have been trained and educated at different levels that help to improve their knowledge earthquake monitoring and seismological research. Besides operating the national seismological network, some local seismic networks have also been established by Institute of Geophysics for many years to monitor and study induced seismicity in some reservoirs of hydropower dams such as Son La, Hoa Binh, Tri An, Yaly, Song Tranh, Lai Chau, Huoi Quang, Ban Chat,...
    Type of Medium: Online Resource
    ISSN: 1859-3097
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2017
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  • 7
    Online Resource
    Online Resource
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2019
    In:  Tạp chí Khoa học và Công nghệ biển Vol. 18, No. 4 ( 2019-03-15), p. 452-459
    In: Tạp chí Khoa học và Công nghệ biển, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 18, No. 4 ( 2019-03-15), p. 452-459
    Abstract: The Red river system is a typical example of Southeast Asian rivers that is strongly impacted by human and climatic conditions, especially in the recent period. In this paper, we aim to investigate the longitudinal variation of the water quality of the Red river, in the section from Hanoi city to the Ba Lat estuary. The sampling campaigns were conducted in the dry seasons in 2017 and 2018. The monitoring results showed that the average concentrations of nutrients (NO2-, NO3-, NH4+, PO43-) were still lower than the allowed values of the Vietnamese standard limits for surface water quality (QCVN 08:2015/BTNMT, column A1) whereas the average concentrations of Cl- and TSS exceeded the allowed values of the QCVN 08:2015/BTNMT, column A1 4.6 and 2.3 times, respectively. NO3- and dissolved silica (DSi) concentrations showed a significant variation from the Hanoi site to the Ba Lat site (6.62 mg/l to 1.19 mg/l for NO3- and 5.21 mg/l to 2.14 mg/l for DSi) whereas SO42-, NO2- and Cl- increased markedly in this longitudinal section, especially from the point SH6 where the salinity started to increase. Based on the three different methods for classification of trophic levels and on the different variables observed during the dry seasons in 2017–2018, the nutrient concentrations of the Red river water tended to slightly increase from the site Hanoi (SH1) to the site SH5 at Nam Dinh, indicating the increase of nutrient external input along the river whereas it tended to decrease from the site SH6 (at mesotrophic/eutrophic level) to the last observed site SH9 (at oligotrophic/mesotrophic level) at the sea due to the dilution of seawater. Seawater in dry season could affect directly the river downstream about 35 km far from the sea. The results may be a guide for planning of water use including agricultural irrigation in the Red river estuary.
    Type of Medium: Online Resource
    ISSN: 1859-3097 , 1859-3097
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2019
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  • 8
    Online Resource
    Online Resource
    FapUNIFESP (SciELO) ; 2018
    In:  Anais da Academia Brasileira de Ciências Vol. 90, No. 3 ( 2018-09), p. 2881-2886
    In: Anais da Academia Brasileira de Ciências, FapUNIFESP (SciELO), Vol. 90, No. 3 ( 2018-09), p. 2881-2886
    Type of Medium: Online Resource
    ISSN: 1678-2690 , 0001-3765
    Language: English
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2018
    detail.hit.zdb_id: 2046885-4
    SSG: 11
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