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  • 1
    Online Resource
    Online Resource
    Dự báo khả năng chịu cắt của dầm bê tông cốt thanh FRP
    Vietnam Institute for Building Materials ; 2022
    In:  Tạp chí Vật liệu & Xây dựng - Bộ Xây dựng Vol. 11, No. 05 ( 2022-02-16)
    Details
    In: Tạp chí Vật liệu & Xây dựng - Bộ Xây dựng, Vietnam Institute for Building Materials, Vol. 11, No. 05 ( 2022-02-16)
    Abstract: Hiện nay cốt thanh FRP (Fiber-reinforced polymer) đã được chấp nhận rộng rãi trong các cấu kiện bê tông như là loại cốt thay thế cho cốt thép thanh truyền thống do khả năng chống ăn mòn tốt, cường độ cao trong khi trọng lượng riêng nhỏ, không bị ảnh hưởng bởi từ tính. Vì vậy, việc dự báo khả năng chịu lực cho loại cấu kiện này, trong đó có khả năng chịu cắt, là một trong những việc quan trọng trong công tác thiết kế. Bài báo giới thiệu phương pháp dự báo và đánh giá khả năng chịu cắt dầm bê tông cốt thanh FRP theo ba tiêu chuẩn ACI 440.1R-06 (Mỹ), CSA S806-02 (Canada) và JSCE-1997 (Nhật Bản). Qua đó đề xuất một công thức đơn giản để dự báo khả năng chịu cắt của dầm bê tông cốt thanh FRP. Các kết quả dự báo được so sánh với 73 kết quả thực nghiệm thu thập được từ các nghiên cứu được công bố trước đây cho thấy kết quả dự báo theo các tiêu chuẩn thiết kế nêu trên khá an toàn với hệ số biến động lớn, trong khi công thức đề xuất cho kết quả phù hợp hơn với kết quả thực nghiệm và có hệ số biến động nhỏ hơn.
    Type of Medium: Online Resource
    ISSN: 1859-381X
    URL: Article
    DOI: 10.54772/jomc.05.2021.231
    Language: Unknown
    Publisher: Vietnam Institute for Building Materials
    Publication Date: 2022
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  • 2
    Online Resource
    Online Resource
    Climatic Issue in an Advanced Numerical Modeling of Concrete Carbonation
    MDPI AG ; 2021
    In:  Sustainability Vol. 13, No. 11 ( 2021-05-26), p. 5994-
    Details
    In: Sustainability, MDPI AG, Vol. 13, No. 11 ( 2021-05-26), p. 5994-
    Abstract: Damage in reinforced concrete structures is frequently caused by reinforcement corrosion due to carbonation. Although a wide range of literature contributed to the concrete carbonation consisting of experimental investigations and numerical simulations, research work on a complete numerical model for concrete carbonation prediction with integrated climatic variables (e.g., temperature, relative humidity) is still a challenge. The present paper aims to propose an advanced numerical model to simulate the penetration of carbon dioxide and moisture, diffusion of calcium ions, heat transfer, and porosity modification in concrete material using COMSOL Multiphysics software. Three coupled mass conservation equations of calcium, water, and carbon dioxide are solved together with additional equations regarding the heat transfer, variation of porosity, and content of portlandite and other hydrates and calcites. In this study, the actual temporal variabilities of temperature and relative humidity in Toulouse, France, are used as a case study. The predicted results of portlandite profiles and carbonation depth are compared with the experimental data and discussed to identify the effect of climatic variables on the concrete carbonation.
    Type of Medium: Online Resource
    ISSN: 2071-1050
    URL: Article
    DOI: 10.3390/su13115994
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2518383-7
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  • 3
    Online Resource
    Online Resource
    Assessing Asian Countries' Competitiveness: Two-Stage Dea Analysis of Global Innovation Index and Logistics Performance Index Integration
    Global Academy of Training and Research (GATR) Enterprise ; 2023
    In:  Global Conference on Business and Social Sciences Proceeding Vol. 15, No. 1 ( 2023-9-15), p. 127-127
    Details
    In: Global Conference on Business and Social Sciences Proceeding, Global Academy of Training and Research (GATR) Enterprise, Vol. 15, No. 1 ( 2023-9-15), p. 127-127
    Abstract: Competitiveness has emerged as a crucial economic characteristic in policy and academia. It refers to the combination of institutions, policies, and factors that determine a country's level of productivity by assessing different aspects of competitiveness. This paper aims to assess the competitiveness of Asian countries by combining Global Innovation Index (GII) and Logistics Performance Index (LPI). The authors implement an integrated model called the Data Envelopment Analysis Super Slack-Based Measure Model (DEA–Super SBM) and the Malmquist Model (DEA–Malmquist) to assess competitiveness from 2012 to 2018. The study begins by validating seven critical factors from the GII and the LPI that impact competitiveness. Subsequently, the Super-SBM model evaluates the competitiveness efficiency for 30 Asian countries during the specified time frame. The DEA–Malmquist model is then employed to analyze the overall change in countries' competitiveness productivity across Asia. This research suggests that most Asian countries have achieved competitiveness efficiency, with countries such as China, Pakistan, and Kuwait demonstrating high indicators. However, a few countries still exhibit relatively low competitiveness indicators, and there has been some variation in competitiveness efficiency over the years. The study's implications can provide valuable insights to governments and policymakers, aiding in developing effective strategies to strengthen competitiveness and foster economic development. Keywords: efficiency; inefficiency; competitiveness; GII; LPI; Data Envelopment Analysis; Malmquist; Super Slack-Based Measure; Asia
    Type of Medium: Online Resource
    ISSN: 9789-6713
    URL: Issue
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.35609/gcbssproceeding.2023
    DOI: 10.35609/gcbssproceeding.2023.1
    DOI: 10.35609/gcbssproceeding
    DOI: 10.35609/gcbssproceeding.2023.1(127)
    Language: English
    Publisher: Global Academy of Training and Research (GATR) Enterprise
    Publication Date: 2023
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  • 4
    Online Resource
    Online Resource
    CHẤT LƯỢNG CUỘC SỐNG VÀ CÁC YẾU TỐ LIÊN QUAN CỦA NGƯỜI BỆNH UNG THƯ SAU HÓA TRỊ
    Can Tho University of Medicine and Pharmacy ; 2022
    In:  Tạp chí Y Dược học Cần Thơ , No. 49 ( 2022-08-25), p. 105-112
    Details
    In: Tạp chí Y Dược học Cần Thơ, Can Tho University of Medicine and Pharmacy, , No. 49 ( 2022-08-25), p. 105-112
    Abstract:   Đặt vấn đề: Chất lượng cuộc sống được xem như là một trong những tiêu chí đánh giá hiệu quả của điều trị. Tuy nhiên, việc đo lường và xác định các yếu tố liên quan đến chất lượng cuốc sống ở người bệnh ung thư sau hóa trị liệu vẫn còn nhiều hạn chế. Mục tiêu nghiên cứu: Đo lường chất lượng cuộc sống và xác định một số yếu tố liên quan ở người bệnh ung thư sau hóa trị. Đối tượng và phương pháp nghiên cứu: Nghiên cứu mô tả cắt ngang trên 43 người bệnh ung thư đang hóa trị liệu tại Khoa Ung bướu Bệnh viện Trường Đại học Y Dược Cần Thơ. Chất lượng cuộc sống được đánh giá dựa vào thang đo chất lượng cuộc sống phiên bản 3.0 của tổ chức nghiên cứu và điều trị ung thư Châu Âu (EORTC QLQ-30). Kết quả: Điểm trung bình chất lượng cuộc sống về sức khỏe tổng quát, chức năng và triệu chứng lần lượt là 6,8; 69,5 và 7,84. Nghiên cứu cho thấy điểm trung bình chất lượng cuộc sống về mặt chức năng thể chất ở nhóm nghề nghiệp công nhân viên cao hơn các nhóm nghề khác, giai đoạn bệnh càng muộn thì chất lượng cuộc sống về mặt chức năng hoạt động và chức năng xã hội càng giảm. Điểm trung bình triệu chứng nôn và buồn nôn ở nữ cao hơn nam, ở đối tượng hưu trí cao hơn nhóm nghề khác và ở giai đoạn IV cao hơn giai đoạn II, III. Tuổi càng cao chất lượng cuộc sống càng giảm và BMI càng thấp thì chất lượng cuộc sống càng giảm. Kết luận: Tuổi, giới, nghề nghiệp, giai đoạn bệnh và BMI được xác định là yếu tố ảnh hưởng đến chất lượng cuộc sống người bệnh ung thư sau hóa trị.
    Type of Medium: Online Resource
    ISSN: 2354-1210
    URL: Issue
    URL: Article
    DOI: 10.58490/ctump.2022i49
    DOI: 10.58490/ctump.2022i49.222
    Language: Unknown
    Publisher: Can Tho University of Medicine and Pharmacy
    Publication Date: 2022
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  • 5
    Online Resource
    Online Resource
    Methods for Designing Signalized Double-Intersections with Mixed Traffic in Vietnam
    Elsevier BV ; 2016
    In:  Procedia Engineering Vol. 142 ( 2016), p. 131-138
    Details
    In: Procedia Engineering, Elsevier BV, Vol. 142 ( 2016), p. 131-138
    Type of Medium: Online Resource
    ISSN: 1877-7058
    URL: Article
    DOI: 10.1016/j.proeng.2016.02.023
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2016
    detail.hit.zdb_id: 2509658-8
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  • 6
    Online Resource
    Online Resource
    The two‐echelon routing problem with truck and drones
    Wiley ; 2022
    In:  International Transactions in Operational Research Vol. 29, No. 5 ( 2022-09), p. 2968-2994
    Details
    In: International Transactions in Operational Research, Wiley, Vol. 29, No. 5 ( 2022-09), p. 2968-2994
    Abstract: In this paper, we study novel variants of the well‐known two‐echelon vehicle routing problem in which a truck works on the first echelon to transport parcels and a fleet of drones to intermediate depots while in the second echelon, the drones are used to deliver parcels from intermediate depots to customers. The objective is to minimize the completion time instead of the transportation cost as in classical two‐echelon vehicle routing problems. Depending on the context, a drone can be launched from the truck at an intermediate depot once (single‐trip drone) or several times (multiple‐trip drone). Mixed‐integer linear programming models are first proposed to formulate mathematically the problems and solve to optimality small‐sized instances. To handle larger instances, a metaheuristic based on the idea of greedy randomized adaptive search procedure is introduced. The main novel feature of our metaheuristic lies in the design of initial solution construction and local search operators, which can cover all the decision layers of the problems and run in using additional data structures. Experimental results obtained on instances of different contexts are reported and analyzed.
    Type of Medium: Online Resource
    ISSN: 0969-6016 , 1475-3995
    URL: Issue
    URL: Article
    DOI: 10.1111/itor.v29.5
    DOI: 10.1111/itor.13052
    RVK:
    QA 10000
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2019815-2
    SSG: 3,2
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  • 7
    Online Resource
    Online Resource
    Flash flood susceptibility prediction mapping for a road network using hybrid machine learning models
    Springer Science and Business Media LLC ; 2021
    In:  Natural Hazards Vol. 109, No. 1 ( 2021-10), p. 1247-1270
    Details
    In: Natural Hazards, Springer Science and Business Media LLC, Vol. 109, No. 1 ( 2021-10), p. 1247-1270
    Type of Medium: Online Resource
    ISSN: 0921-030X , 1573-0840
    URL: Article
    DOI: 10.1007/s11069-021-04877-5
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 2017806-2
    SSG: 14
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  • 8
    Online Resource
    Online Resource
    A novel approach using sustainable structures in preventing coastal erosion and forming sandy beach in Vietnam
    IOP Publishing ; 2020
    In:  IOP Conference Series: Materials Science and Engineering Vol. 869, No. 7 ( 2020-06-01), p. 072053-
    Details
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 869, No. 7 ( 2020-06-01), p. 072053-
    Abstract: A new solution using ultra-high performance concrete (UHPC) sheet piles was a hard wall structure combined with gabion groyne dams for the purpose of shore protection, sand accretion, and tourist beach creation was proposed in this study. The proposed approach was then applied to meet the both shore protection and sandy beach generation requirements of private Rung Duong resort project in Ba Ria-Vung Tau, Vietnam. The UHPC sheet piles reinforced by fiber reinforcement polymer (FRP) installed in form of a vertical wall were designed and constructed for the shore protection purpose. Together with the later built gabion groyne dam system, the combined structure brought a very good coastal protection effect. As a result observed from Rung Duong resort, the shoreline was pushed back out very far from the resort, while sandy beaches in front of the resort were formed and expanded widely.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    URL: Article
    DOI: 10.1088/1757-899X/869/7/072053
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2506501-4
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  • 9
    Online Resource
    Online Resource
    A virtual synchronous generator control method in microgrid with vehicle-to-grid system
    Walter de Gruyter GmbH ; 2023
    In:  Journal of Electrical Engineering Vol. 74, No. 6 ( 2023-12-01), p. 492-502
    Details
    In: Journal of Electrical Engineering, Walter de Gruyter GmbH, Vol. 74, No. 6 ( 2023-12-01), p. 492-502
    Abstract: The inertia in power systems plays a very important role in stabilizing the power system. With the growth of distributed generation (DG)/renewable energy source (RES) penetration in the power grid, there has been a concern about the lack of inertia in the power system. One of the solutions to solve the problem is to use the Virtual Synchronous Generator (VSG) control method. For energy storage, the Vehicle-to-grid (V2G) storage system can replace the traditional hybrid energy storage which consists of batteries and supercapacitors. This application will be implemented in Microgrid. The article will focus on simulating the Microgrid with the V2G system and solar energy as a renewable energy source, the inverters are controlled by the method of VSG control. The models will be simulated and the results will be shown on MATLAB/SIMULINK software.
    Type of Medium: Online Resource
    ISSN: 1339-309X
    URL: Article
    DOI: 10.2478/jee-2023-0057
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2023
    detail.hit.zdb_id: 2676892-6
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  • 10
    Online Resource
    Online Resource
    Safety and Immunogenicity of Nanocovax, a SARS-CoV-2 Recombinant Spike Protein Vaccine
    Elsevier BV ; 2021
    In:  SSRN Electronic Journal
    Details
    In: SSRN Electronic Journal, Elsevier BV
    Type of Medium: Online Resource
    ISSN: 1556-5068
    URL: Article
    DOI: 10.2139/ssrn.3931736
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
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