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  • 1
    Online Resource
    Online Resource
    IOP Publishing ; 2024
    In:  Advances in Natural Sciences: Nanoscience and Nanotechnology Vol. 15, No. 1 ( 2024-03-01), p. 015017-
    In: Advances in Natural Sciences: Nanoscience and Nanotechnology, IOP Publishing, Vol. 15, No. 1 ( 2024-03-01), p. 015017-
    Abstract: In this study, we use the chemical vapour deposition trapping method to grow various one-dimensional (1D) indium oxide (In 2 O 3 ) nanostructures, namely nanorods (NRs), nanoneedles (NNs), and nanowires (NWs). The structural and morphological characteristics of the synthesised nanostructures are analysed using x-ray diffraction and scanning electron microscopy. By comparing the morphology of In 2 O 3 under different growth conditions with previous research findings, we investigate the growth mechanism and the role of gold catalysts. The In 2 O 3 sensor presented a good selection for C 2 H 5 OH gas. The NWs-based sensor exhibits a superior response and faster response-recovery rates (50%, and 49 s/343 s) in comparison to the NRs- (45%, and 35 s/339 s) and NNs-based sensors (8%, and 70 s/496 s) when exposed to 200 ppm C 2 H 5 OH at 400 °C. Besides, the sensors exhibited good stability under the switch-off reversible cycle. The linear discriminant analysis (LDA) model was effectively used in classifying target gases such as 25–200 ppm C 2 H 5 OH, NH 3 , and CO at the temperature of 350 °C–450 °C. We attribute the NWs-based sensor’s better gas-sensing performance to its favourable morphology for gas diffusion and modulation of depletion depth.
    Type of Medium: Online Resource
    ISSN: 2043-6262
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2024
    detail.hit.zdb_id: 2563789-7
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  • 2
    Online Resource
    Online Resource
    Academy of Military Science and Technology ; 2022
    In:  Journal of Military Science and Technology , No. 81 ( 2022-08-26), p. 148-155
    In: Journal of Military Science and Technology, Academy of Military Science and Technology, , No. 81 ( 2022-08-26), p. 148-155
    Abstract: Tính riêng tư về dữ liệu của khách hàng hiện nay đang rất được quan tâm, có rất nhiều vụ bê bối lợi dụng thông tin khách hàng để vụ lợi gây ra bởi nhiều công ty công nghệ khác nhau, có sở hữu cơ sở dữ liệu lớn thông tin về khách hàng. Vấn đề đặt ra là làm sao khi người dùng có thể cung cấp dữ liệu đáp ứng được thuật toán được sử dụng trong mô hình xác thực, cho ra kết quả chính xác mà vẫn không làm lộ thông tin riêng tư hoặc dữ liệu cá nhân. Nghiên cứu lý thuyết về hệ mật mã đồng cấu và mã hóa công khai có thể giải quyết những vấn đề về bảo mật tính riêng tư người dùng. Nội dung bài báo trình bày những vấn đề cơ bản về: phép đồng cấu và hệ mật mã công khai Paillier; tính khoảng cách Euclid đối với mẫu có độ dài cố định; kết quả thực nghiệm mã hóa mẫu bằng mã hóa Paillier sau đó kiểm tra tính đúng đắn bằng cách tính toán, so sánh độ dài với ngưỡng δ xác định để chọn loại bỏ mẫu không thích hợp và quyết định sự kết hợp của hệ thống. Từ đó, đề xuất phương án bảo vệ mẫu và bảo đảm tính riêng tư của người dùng đối với mẫu có độ dài cố định.
    Type of Medium: Online Resource
    ISSN: 1859-1043
    URL: Issue
    Language: Unknown
    Publisher: Academy of Military Science and Technology
    Publication Date: 2022
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  • 3
    Online Resource
    Online Resource
    The University of Danang ; 2022
    In:  Journal of Science and Technology Issue on Information and Communications Technology ( 2022-12-31), p. 52-55
    In: Journal of Science and Technology Issue on Information and Communications Technology, The University of Danang, ( 2022-12-31), p. 52-55
    Abstract: Five natural secondary metabolites as cinnamic acid (1), (+)-catechin (2), (-)-epicatechin (3), p-coumaric acid (4), and ferulic acid (5) were isolated from Amanita caesarea based on anti-inflammatory activity-guided extraction. Their structures (1-5) were determined by NMR spectra as well as by comparison with previously reported literature. Compounds 3 and 5 have been isolated from A. caesarea for the first time. The anti-inflammatory activity through inhibition of nitric oxide (NO) production of isolates (1-5) was evaluated. Among them, compounds 2 and 3 exhibited strong inhibitory activity with IC50 values of 4.8 and 5.7 μM, respectively. Compounds 4 and 5 with IC50 values of 18.4 and 9.6 μM, respectively showed moderate inhibitory activity. The results proposed that A. caesarea might exert anti-inflammatory effects due to its mainly NO-inhibitory constituents
    Type of Medium: Online Resource
    ISSN: 1859-1531
    Language: Unknown
    Publisher: The University of Danang
    Publication Date: 2022
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  • 4
    In: Environmental Health Insights, SAGE Publications, Vol. 14 ( 2020-01), p. 117863022095967-
    Abstract: Drinking water quality affects directly human health. Assessment and prevention of water-borne diseases are crucial for primary prevention, especially for children. Objective: The main aim of this study was to investigate the quality of drinking water from tap water in preschools and primary schools in a district area in Hanoi City, Vietnam. Methods: A cross-sectional study was performed from August to October 2019. Water samples from tap water of 154 schools in a district area of Hanoi were collected to determine the quality of drinking water. From each school, at least 2 bottles of water samples were collected on the basis of a standard operating procedure (SOP). Each water sample was analyzed for microbial and physicochemical parameters, including Color, Taste and Odor, Turbidity, pH, Nitrite, Nitrate, Ammonium, Total Iron, Permanganate, Chloride, Hardness, Total Manganese, Sulfate, Arsenic, Coliform, and E.coli, by analytical methods. The obtained values of each parameter were compared with the standard values set by WHO and National Technical Regulation on Domestic Water Quality of Vietnam. Results: All of the schools employed community water system as a main source for drinking water. The results showed that all tested samples were found to be within the standards for some physicochemical properties, including Color, Taste and Odor, Hardness, Chloride, Total Iron (Fe 2+ và Fe 3+ ), Total Manganese (Mn), Nitrate (NO 3 – ), Sulfate (SO 4 2– ), and Total Arsenic (As). On the other hand, some samples did not meet the allowable limits of the national standard, due to pH (3.9%), Turbidity (0.6%), Nitrite (3.2%), Permanganate (6.5%), and Ammonium (5.8%). Furthermore, the microbial data revealed that the substandard water samples from municipal water systems were contaminated by Coliform (9.7%) and/or E.coli (7.8%). Conclusions and recommendations: Contaminants such as bacterial and chemical agents in to drinking water could be occurred during transport, storage and handling before using by the consumer without regular surveillance. A periodic treatment procedure and monitoring system to keep the level of microbial and chemical contamination of drinking water in schools under control should be performed.
    Type of Medium: Online Resource
    ISSN: 1178-6302 , 1178-6302
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2452946-1
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  • 5
    In: Healthcare, MDPI AG, Vol. 9, No. 12 ( 2021-12-10), p. 1713-
    Abstract: (1) Background: The present study measures the fear of COVID-19 among hospital healthcare workers and identifies several factors associated with increasing fear of COVID-19. (2) Methods: A cross-sectional, hospital-based survey was conducted on healthcare workforce recruited from the National Hospital of Tropical Diseases from 1 October 2021 and 20 October 2021. We selected the participants who have been directly involved in diagnosing, treating, or providing nursing care to patients with COVID-19. The primary data was collected via sending the invitation directly to the participants, utilizing structured self-completed questionnaires. The seven-item fear of COVID-19 scale was used to measure the data. The responses of 208 hospital healthcare workers were included in the final analysis. (3) Results: Total score of COVID-19 fear was 19.62 (SD = 5.22). The COVID-19 fear score of 7 items ranged from 2.38 (SD = 0.83) to 3.21 (SD = 0.96). The lowest and highest scores were the item ‘My hands become clammy when I think about Corona’ and the item ‘I am most afraid of corona’ was the highest, respectively. Linear regression of the COVID-19 fear showed that the factors positively correlated with the fear of COVID-19 among hospital healthcare workers were: being influenced by the community (p = 0.001), feeling at very high risk of COVID-19 (p = 0.03), and experiencing traumatic stress with an academic event (p = 0.042). (4) Conclusions: Although these findings merit further elaboration, these preliminary findings suggest relatively great fear of the COVID-19 pandemic among Vietnamese hospital healthcare workers and that social and personal connections are necessary for maintaining the mental wellbeing.
    Type of Medium: Online Resource
    ISSN: 2227-9032
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2721009-1
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  • 6
    In: Ministry of Science and Technology, Vietnam, Ministry of Science and Technology, Vietnam (VMOST), Vol. 63, No. 2 ( 2021-2-15), p. 10-15
    Abstract: Conducted from April 2019 to July 2020, this study aimed to assess the software accuracy in assisting Z-line segmentation by comparing with medical doctors’ detection results and by recording doctors’ satisfaction in scale, time-of-implementation in interactive mode, and integrated mode. For the development of the Z-line detection algorithm, a dataset of 533 high-definition endoscopic WLI (white-light) images in diverse forms of Z-line were collected. The software was subsequently developed in 4 modes, including manual mode, interactive mode (using Superpixels-BPT), automatic mode (using AI algorithm), and integrated mode (the combination of BPT and U-Net). 30 endoscopic images were assigned to 2 groups of doctors (under 2-year experience and over 5-year experience) for the Z-line detection using the software in 4 modes. Time-of-implementation, number of mouse clicks, satisfaction in scales, and IoU (Interception over Union) metric with expert’s ground-truth are used for assessment. The results showed that IoU metrics of interactive and integrated modes in the experimental dataset was 88% with no statistical difference to the IoU value of manual mode, and mean IoU metrics from the results of 4 modes were high, from 86.7 to 90.8%. The mean values of time-of-implementation in interactive mode and integrated mode were not statistically different from manual mode. The median number of mouse-clicks each use in the interactive mode and the integrated mode were 24.5 and 15.5 times, respectively. The software received good feedbacks from the doctors, with the mean values of satisfaction scores of automatic mode, interactive mode and integrated mode are 7.2, 7.3, and 7.2 respectively. The development of the software for detecting endoscopic anatomy landmarks is a novel and feasible research direction in Vietnam. Further studies could focus on detecting some specific lesions classified according to anatomy landmarks.
    Type of Medium: Online Resource
    ISSN: 1859-4794
    URL: Issue
    Language: Unknown
    Publisher: Ministry of Science and Technology, Vietnam (VMOST)
    Publication Date: 2021
    SSG: 6,25
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  • 7
    In: Tropical Medicine and Infectious Disease, MDPI AG, Vol. 7, No. 1 ( 2021-12-23), p. 3-
    Abstract: (1) Background: This study aims to assess the magnitude of, and factors associated with, depression and anxiety among Vietnamese frontline hospital healthcare workers in the fourth wave of COVID-19; (2) Methods: A hospital based cross-sectional study was carried out within two weeks, October 2020, at a central COVID-19 treatment hospital. Depression and anxiety were measured with PHQ-9 and GAD-7, respectively. Bivariate and multivariate logistic regression analysis were applied to recognize variables related to depression and anxiety, respectively; (3) Results: Among 208 frontline hospital healthcare workers, overall prevalence of depressive symptoms, anxiety symptoms, and both symptoms of depression and anxiety was 38.94%, 25.48% and 24.04%, respectively, in healthcare workers. In a reduced model after using multivariate stepwise logistic regression, age (OR = 0.9, p = 0.001), marital status (OR = 7.84, p = 0.027), profession (OR = 0.39, p = 0.028), having experienced traumatic stress following a work event (OR = 46.24, p 〈 0.001), feeling at very high risk for COVID-19 (OR = 0.02, p 〈 0.04), and affected by workplace conditions (OR = 5.36, p 〈 0.001) were associated with the symptoms of depression. With regard to symptoms of anxiety, single status (OR: 12.18, p = 0.002), being medical technician (OR: 68.89, p 〈 0.001), alcohol use (OR: 6.83, p = 0.014), using pain relief medications (OR: 25.50, p = 0.047), having experienced traumatic stress following a family event (OR: 130.32, p = 0.001), having experienced traumatic stress following a work event (OR: 181.55, p = 0.002), reporting at very high risk for COVID-19 (OR: 29.64, p = 0.011), treating moderate (OR: 6.46, p = 0.038) and severe (OR: 18.96, p = 0.004) COVID-19 patients, and being significantly affected by the community (OR: 6.33, p = 0.003) were increased risk factors for the symptoms of anxiety. Meanwhile, those living with 4–5 people (OR: 0.15, p = 0.011), specializing in infectious disease (OR: 0.13, p = 0.044)/resuscitation and emergency medicine (OR: 0.04, p = 0.046), and having knowledge preparation before participating in COVID-19 (OR: 0.008, p = 0.014) were less associated with the symptoms of anxiety; (4) Conclusions: There was a relatively high prevalence among Vietnamese hospital healthcare workers exhibiting symptoms of depression and anxiety during the ongoing pandemic. Greater attention to training in psychological skills should be suggested for those belonging to a younger age group, being single/widowed/divorced, treating moderate and severe COVID-19 patients, feeling at very high risk for COVID-19, being significantly affected a lot the community or workplace conditions, or experiencing traumatic stress following a family/work event in the past week.
    Type of Medium: Online Resource
    ISSN: 2414-6366
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2934690-3
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  • 8
    In: Ministry of Science and Technology, Vietnam, Ministry of Science and Technology, Vietnam (VMOST), Vol. 63, No. 1 ( 2021-1-30), p. 55-59
    Abstract: Dispersion of nanoclay in Epikote 828 resin is conducted by closed mixing of the liquid composition, mechanical mixing combined with ultrasonic vibration to form masterbatch; meanwhile, nanoclay dispersion in bitumen is processed by melted bitumen mixing. XRD techniques were used to determine the basal d-spacing of nanoclay. The dispersion was performed in Brabender mixer at temperature 40oC, speed 50 rpm, an Epikot/I30E=100/80 masterbatch provided the best dispersion with d001=33.818 Å. After mechanical mixing, an Epikote 828 composition with 4% I30E was sonicated for 5, 10, and 20 minutes. The value d001=41.65 Å achieved after 10 minutes of sonication was deemed optimal. Dispersion of 4% I30E in melted bitumen at 120, 130, 140, 150, and 160oC after 2h reached d001=49.5916 Å for the sample processed at 120oC. At high temperatures, penetration and delamination of bitumen were better than those of Epikote 828 despite the lower molecular weight of Epikote.
    Type of Medium: Online Resource
    ISSN: 1859-4794
    URL: Issue
    Language: Unknown
    Publisher: Ministry of Science and Technology, Vietnam (VMOST)
    Publication Date: 2021
    SSG: 6,25
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  • 9
    In: Molecules, MDPI AG, Vol. 26, No. 12 ( 2021-06-17), p. 3691-
    Abstract: Folk experiences suggest natural products in Tetradium ruticarpum can be effective inhibitors towards diabetes-related enzymes. The compounds were experimentally isolated, structurally elucidated, and tested in vitro for their inhibition effects on tyrosine phosphatase 1B (PTP1B) and α-glucosidase (3W37). Density functional theory and molecular docking techniques were utilized as computational methods to predict the stability of the ligands and simulate interaction between the studied inhibitory agents and the targeted proteins. Structural elucidation identifies two natural products: 2-heptyl-1-methylquinolin-4-one (1) and 3-[4-(4-methylhydroxy-2-butenyloxy)-phenyl]-2-propenol (2). In vitro study shows that the compounds (1 and 2) possess high potentiality for the inhibition of PTP1B (IC50 values of 24.3 ± 0.8, and 47.7 ± 1.1 μM) and α-glucosidase (IC50 values of 92.1 ± 0.8, and 167.4 ± 0.4 μM). DS values and the number of interactions obtained from docking simulation highly correlate with the experimental results yielded. Furthermore, in-depth analyses of the structure–activity relationship suggest significant contributions of amino acids Arg254 and Arg676 to the conformational distortion of PTP1B and 3W37 structures overall, thus leading to the deterioration of their enzymatic activity observed in assay-based experiments. This study encourages further investigations either to develop appropriate alternatives for diabetes treatment or to verify the role of amino acids Arg254 and Arg676.
    Type of Medium: Online Resource
    ISSN: 1420-3049
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2008644-1
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  • 10
    In: Ceramics International, Elsevier BV, Vol. 49, No. 14 ( 2023-07), p. 23796-23804
    Type of Medium: Online Resource
    ISSN: 0272-8842
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
    detail.hit.zdb_id: 2018052-4
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