Decomposition

In this study, we report on the hydrothermal synthesis of ZnO nanorods and the change in photocatalytic properties with different hydrothermal temperatures in the decomposition of Methylene blue (MB) and Rhodamine B (RhB) under visible light.

11p viengfa 28-10-2024 2 1   Download

BiFeO3 (BFO) was synthesized using a combustion sol-gel method from reactants of Bi(NO3)3.5H2O and Fe(NO3)3.9H2O with various complexation reagents. The absorbance and photocatalytic activity of BFO on Methylene Blue (MB) decomposition were studied using infrared (IR) and UV-Vis spectroscopy.

10p viengfa 28-10-2024 3 2   Download

Recently, the phase field modelling is widely used to model and simulate material damage. In present work, we present a framework of the topology optimization combined with the phase-field modelling with/ without interfacial damage for optimizing the damage resistance of the inclusion-matrix composites.

17p vibecca 01-10-2024 1 1   Download

The phase-field method has become a robust tool to describe the complex crack nucleation and propagation in heterogeneous materials. In these materials, an interaction between bulk brittle damage and interfacial damage through the splitting the strain tensor into a bulk strain part and a jump strain part at the interfaces.

15p vibecca 01-10-2024 3 1   Download

In recent times, the phase field method is a robust simulation tool that can predict crack formation and propagation in structures. In brittle and quasi-brittle materials, the strain tensor is decomposed into negative and positive parts corresponding to the compression and tension behaviors when the structure is loaded.

14p vibecca 01-10-2024 1 1   Download

This article studies developing an algorithm called KalmanEMD with the combination of Kalman filter and empirical mode decomposition for processing this signal type. The algorithm is applied in 6 data sets measuring the shockwave pressure of underwater explosions by PCB W138A05 sensors with the same condition that 184 grams of A-IX-2 explosive is detonated underwater.

15p viyoko 01-10-2024 1 1   Download

Porous carbon material is one of the most common and very important for various applications thank to its high surface area and adsorption capability. In this study, mesoporous carbon was prepared by thermal decomposition of copper-based metal-organic framework MOF-199 under inert atmosphere and followed by immersing in diluted HNO3 solution in order to remove metal/metal oxide and activation of the resultant porous carbon.

5p vikwong 29-09-2024 4 1   Download

In this article, the results of the research on organic pollutant treatment in the wastewater of printing processes on fabric by H2O2 under the catalytic role of the complex between ion Ni2+ and Citric acid (H4L) were presented.

5p vikwong 29-09-2024 3 1   Download

This research focused on surveying the decomposition efficiency of methyl orange, alizarin yellow and mordant black -T in the systems without and with UV light in water: alone zero-valent iron; alone persulfate; both zero-valent iron and persulfate.

6p vikwong 29-09-2024 2 1   Download

In this study, we successfully synthesized a bimetallic metal-organic framework material Zn/Co-ZIF to start Peroxymonosulfate (PMS) for organic dye degradation in the water body. Material characterization was evaluated by advanced methods, such as XRD, FT-IR, SEM, EDX, and BET. The influence of different factors on methylene blue (MB) decomposition rate was investigated.

7p vikwong 29-09-2024 3 1   Download

This research determines the impact of foreign direct investment (FDI) on the economic growth of Vietnam (economic) over the period 1990 to 2020 after the political and economic reforms (Doi Moi) in 1986. The study uses the VAR model through unit root test, Granger causality, impulse response, and variance decompositions to achieve the goal of finding the impacts of FDI on economic growth.

15p viormkorn 27-09-2024 3 3   Download

Trong bài báo này, phương pháp Proper generalized decomposition kết hợp với sơ đồ sai phân hữu hạn bậc cao (HOCFD-High order compact finite difference) được đề xuất để giải phương trình 3D Poission. Trước tiên, phương pháp PGD được áp dụng để đưa phương trình 3D Poission thành chuỗi các phương trình vi phân 1D. Sau đó, sơ đồ sai phân hữu hạn bậc cao được áp dụng để giải các phương phương trình vi phân 1D.

8p gaupanda051 13-09-2024 2 1   Download

Bài viết "Phương pháp phân tích giá trị đơn rút gọn và ứng dụng trong nén ảnh" trình bày lại phương pháp phân tích giá trị đơn (singular value decomposition- viết tắt SVD) và phương pháp phân tích giá trị đơn rút gọn (truncated SVD) và ứng dụng trong nén ảnh.

7p gaupanda051 13-09-2024 3 1   Download

This article studies determinants of the sales of food companies listed in Vietnam stock market in the increasing trend of international trade. We carried out a research on 50 listed food companies in Vietnam in the period from 2014 to 2019. In this study, beside the regression analytical technique, the Blinder - Oaxaca decomposition analysis is used to study more deeply the effect of factors on the sales of companies.

19p toduongg 24-08-2024 3 1   Download

This paper uses decomposition analysis and Tapio decoupling indicator to shed light on the role of reducing aggregate carbon emission intensity in decoupling economic growth from carbon emissions. The case study is Vietnam, a developing country with high carbon emissions per unit of GDP. Using data from the World Development Indicators by the World Bank, the research results show that low total carbon emissions growth and better decoupling status are achieved only in the years with a reduction in aggregate emission intensity.

17p toduongg 24-08-2024 3 2   Download

This research uses decomposition analysis and the optimal structure analysis to evaluate the role of change in sectorial structure of gross domestic product in reducing carbon emission intensity in 10 OECD countries during 2010 - 2018. The data are adapted from the environmental account and social matrix account belonging to the database of OECD statistics. The decomposition analysis result shows that changes in GDP structure made the aggregate emission intensity in Denmark, Finland, and Slovak Republic increase, but made the indicator in other countries decrease.

24p toduongg 24-08-2024 2 2   Download

The article presents the graphical analysis of economic indicators for 25 countries: GDP growth rate (%) and GDP per person employed (thousand US dollars) for the period from 1990 to 2016 by considering the supply chain strategy (SCS) and transparency. The authors carried out the decomposition of economic growth rates of selected countries according to the following factors: 1) extensive factors – the growth rate of the capital stock and the size of labor force; 2) intensive factors – R&D expenditures; 3) the dynamics of foreign direct investment in the country 4) supply chain strategy.

8p longtimenosee09 08-04-2024 17 1   Download

Mực nước sông có liên quan mật thiết đến cấp độ lũ. Việc dự báo sớm mực nước sông giúp dự đoán cấp độ lũ và hỗ trợ con người trong việc xây dựng phương án phòng chống lũ, hạn chế các tác hại do lũ gây ra. Ngày nay, nhiều phương pháp học máy đã được ứng dụng trong bài toán dự báo mực nước.

3p vigeorge 06-12-2023 13 2   Download

Nghiên cứu này sử dụng phương pháp phân rã cấu trúc (Structural Decomposition Analysis - SDA) với bảng I - O phi cạnh tranh để tìm hiểu những động cơ tăng trưởng chính của Việt Nam giai đoạn 2011 - 2018, đồng thời xác định các ngành kinh tế trọng điểm cũng như các ngành kinh tế mũi nhọn của Việt Nam trong giai đoạn này.

14p vischultz 17-10-2023 12 5   Download

Bài viết Đánh giá hiệu quả kỹ thuật thủy vân bền vững trên những miền tần số kết hợp đề xuất lược đồ thủy vân mù (blind watermarking) áp dụng cho ảnh số sử dụng biến đổi DWT (Discrete Wavelet Transform) kết hợp DCT (Discrete Cosine Transform) và SVD (Singular Value Decomposition) dựa trên thống kê.

14p viannee 02-08-2023 10 4   Download