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    Wyświetlanie 1-7 z 7
    Tytuł:
    Optimization of Copper Removal by Photovoltaic Electrocoagulation from Aqueous Solution Using Response Surface Methodology Towards Sustainable Development
    Autorzy:
    Thanh, Hoa Nguyen
    Nguyen, Lien
    Lan, Phuong Dinh Thi
    Powiązania:
    https://bibliotekanauki.pl/articles/123109.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    photovoltaics
    electrocoagulation
    copper
    Box-Behnken design
    energy consumption
    lithium battery
    sustainable development
    Opis:
    This research aims at illustrating the optimal functions of removing copper ions in aqueous solution by means of the electrocoagulation process in which portable solar power generators are used as renewable energy. A solar photovoltaic cell (PV), producing approximately 48A current intensity for 4-7 h per day, was sufficient to charge the lithium batteries completely during the day. This system was connected directly to the electrocoagulation tank. The Box-Behnken design (BBD) was applied to evaluate three effects of process factors: current density, the dose of electrolyte (NaCl), and application time. The results showed that an optimal efficiency of 99.01% Cu removal plus an energy savings of 1.039 kWh/m3 were obtained at a current density of 4 A/m2, the dosage of NaCl (electrolyte) of 1.87 g/L, and electrolysis time of 10 min. The chemical components of the sludge produced under these optimized conditions were determined by means of EDX. It was illustrated that the copper ions were the main elements of sludge, and nonhazardous compounds were contained. The PV-lithium battery system is considered to be an efficient alternative energy source toward sustainable development.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 7; 103-111
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of macro economic factors and financial development on energy projects - case in ASEAN countries
    Autorzy:
    Hanh, Hoang Thanh
    Huy, Dinh Tran Ngoc
    Phuong, Nguyen Thi Thanh
    Nga, Le Thi Viet
    Anh, Pham Tuan
    Powiązania:
    https://bibliotekanauki.pl/articles/1818318.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    countries ASEAN
    commerce
    financial development
    energy project
    macroeconomic
    macro politicies
    kraje ASEAN
    handel
    rozwój finansowy
    projekty energetyczne
    makroekonomia
    makropolityka
    Opis:
    ASEAN (The Association of SouthEast Asian Nations) demand on energy is depending on economic growth of each country, resources, and political and regulations of each country. This study aims to investigate the role of international trade, financial development, foreign direct investment (FDI) on the consumption of renewable energy (RE) in ASEAN countries of the world. The findings explore that positive nexus among the international trade, real output, financial development, foreign direct investment and consumption of RE. Last but not least, this paper will propose several recommendations and policy suggestion for ASEAN countries to manage and encourage better renewable energy projects in the region. One of its original value is that, in the globalization and integration era, environment pollution will affect all ASEAN countries and in the region, so these nations need to link together to implement renewable projects for environment protection and for further generation.
    Źródło:
    Management; 2020, 24, 2; 146-157
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on social security through Buddhism in the Tran dynasty
    Badania nad zabezpieczeniem społecznym przez buddyzm w dynastii Tran
    Autorzy:
    (Rev. Thich Thanh Dien), Duong Quang Dien
    Thi Phuong Chi, Nguyen
    Van Tuan, Nguyen
    Van Kieu (Most Rev. Thich Dao Thinh), Bui
    Thi Minh Hong (Bhikkhuni Thich Dieu Tam), Cao
    Thi Nga, Nguyen
    Powiązania:
    https://bibliotekanauki.pl/articles/1790768.pdf
    Data publikacji:
    2021
    Wydawca:
    Towarzystwo Wiedzy Powszechnej w Szczecinie
    Tematy:
    Social security
    amnesty
    Buddhism
    Tran dynasty
    amnestia
    Buddyzm
    dynastia Tran.
    zabezpieczenie spoełczne
    Opis:
    During the period from 8th Century to early decades of the 14th Century, Dai Viet was in the course of prosperous development with reigns of Tran Thai Tong (ruled from 1226-1258), Tran Thanh Tong (1258-1278), Tran Nhan Tong (1278-1293), Tran Anh Tong (1293-1314), Tran Minh Tong (1914-1329), and Trang Hien Ton (1329-1341). We can say that this is time of prosperity and advance of Tran Dynasty. The Tran Kings’ piety upon Buddhism had a great impact on thought and government policies, especially the spirit of equality and humanity. Kings of Tran express a great care on life of the people, try to relieve their toils, reduce their duties, help the poor, and enhance the social security.116 From Tran Du Tong onwards, all was not as before anymore. Research on social security by Buddhism in Tran dynasty can be presented in many aspects, but this article just focuses on clarifying the social security through Buddhism’s care on material and spiritual life of the people.
    W okresie od VIII wieku do wczesnych dekad XIV wieku - za czasów panowania: Tran Thai Tong (rządził od 1226-1258), Tran Thanh Tong (1258-1278), Tran Nhan Tong (1278-1293), Tran Anh Tong (1293-1314), Tran Minh Tong (1914-1329), i Trang Hien Ton (1329-1341) - Dai Viet był w na drodze rozwoju. Można powiedzieć, że jest to czas prosperity i postępu dynastii Tran. Pobożność królów Tranu wobec buddyzmu miała wielki wpływ na myślenie i politykę rządu, zwłaszcza na ducha równości i człowieczeństwa. Królowie dynastii Tran wyrażają wielką troskę o życie ludzi, starają się ulżyć im w trudach, zmniejszają ich obowiązki, pomagają biednym i zwiększają bezpieczeństwo społeczne. Od czasów Tran Du Tong, wszystko nie było już takie jak dawniej. Badania nad zabezpieczeniem społecznym przez Buddyzm w dynastii Tran można przedstawić w wielu aspektach, niniejszy artykuł koncentruje się jednak tylko na wyjaśnieniu zabezpieczenia społecznego poprzez opiekę Buddyzmu nad materialnym i duchowym życiem ludzi.
    Źródło:
    Edukacja Humanistyczna; 2021, 1, 44; 171-193
    1507-4943
    Pojawia się w:
    Edukacja Humanistyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rice Growth, Grain Zinc, and Soil Properties under Saline Irrigation Conditions
    Autorzy:
    Thi, Lan Phuong Dinh
    Hang, Nga Nguyen Thi
    Nguyen, Hoa Thanh
    Nguyen, Lien Thi
    Powiązania:
    https://bibliotekanauki.pl/articles/1955578.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    salt stress
    rice growth
    nutrient zinc
    irrigation water
    salt accumulation
    Opis:
    This research evaluated rice growth and yield as well as Zn accumulation in both soil and grain under saline water irrigation conditions. The experiment consisted of a series of pots containing rice plants and paddy soil, with the application of irrigation treatments of five different salinity levels (1.5, 2, 3, 4, and 5‰ with a drip irrigation system). The results show that the salinity accumulation levels in soil can increase by up to 2.8‰ following the application of 5‰ salinity irrigation water during the development stages. Besides, this study also aimed to evaluate the influences of saline water irrigation on the observed rice yields, plant height, leaf length, and leaf width. In the results, irrigation with 3‰ saline water reduced potential rice yield by 58.6% and the length of rice leaves by one-third. Higher salinity of 4‰ in the irrigation water produced only 24% of average potential productivity, and 5‰ water salinity resulted in no yield. Furthermore, salt stress limited the mobile Zn content in paddy soil, reducing the Zn accumulation in grains by between 36.27% and 83.21%. Thus, the study shows that controlling salinity in irrigation water management is essential for controlling the yield and nutrient Zn content in rice grains.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 9; 59-70
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cadmium Immobilization in the Rice – Paddy Soil with Biochar Additive
    Autorzy:
    Thi, Khac Vu
    Lan, Phuong Dinh Thi
    Hang, Nga Nguyen Thi
    Thanh, Hoa Nguyen
    Powiązania:
    https://bibliotekanauki.pl/articles/2086382.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    Cd
    cadmium
    soil contamination
    rice grain
    cadmium accumulation
    biochar
    straw
    Opis:
    Cadmium (Cd) is toxic for humans, but its effects on the yield and quality of rice under contaminated irrigation conditions remain uncertain. In this study, paddy soils in the Red River Delta (Vietnam) were selected for experiments with the purpose of understanding the effects of Cd contaminated irrigation water on growth, yields, and grain Cd accumulation. In addition, biochar was produced from rice husk (BRH) and rice straw for preventing Cd infiltration into rice was also studied in this experiment. A field experiment was established with applicated BRH and straw into polluted paddy soil, as a result the Cd content in grains reduced significantly. The Cd contaminated soil was added to the BRH and rice straw (RS) with six ratios, including: (1) RS 2.5%, (2) BRH 2.5%, (3) RS-BRH: 1.25–1.25%, (4) RS 5.0%, (5) BRH 5.0%, (6) RS-BRH: 2.5–2.5%, (w:w). Besides, three content levels 0.01–0.05–0.5 mg/L of Cd in irrigation water were applied throughout crop season. The results showed that the Cd accumulation in rice was in the following order: roots > stems > seeds. With 3 contaminated irrigation levels which were applied, the Cd concentrations of 0.05 mg/L and 0.5 mg/L affected plant height and yield. However, the Cd content in grains under contaminated soil condition can be controlled from 82.47–83.94% by applying a BRH ratio from 2.5–5% (w:w).
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 4; 85--95
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new environmentally friendly chemical mechanical polishing method applied for surface finishing Ti-6Al-4V alloy
    Autorzy:
    Quang, Nguyen Minh
    Quan, Nguyen Ngoc
    Mai, Nguyen Trong
    Thanh, Le Thi Phuong
    Tung, Nguyen Tien
    Tan, Tran Ngoc
    Hai, Ha Thanh
    Trinh, Nguyen Duy
    Powiązania:
    https://bibliotekanauki.pl/articles/28407325.pdf
    Data publikacji:
    2023
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    chemical-mechanical polishing
    hydrogen peroxide
    TI-6AL-4V
    silica
    malic acid
    Opis:
    A new eco-friendly slurry has been developed for the chemical mechanical polishing process with a solution of malic acid, deionized water, and an oxidizing agent hydrogen peroxide (H2O2). The surface quality of Ti-6Al-4V workpieces with the proposed chemical mechanical polishing slurry with optimal parameters include oxidizers (H2O2), colloidal (SiO2) slurry, and deionized water by weight 8%, 45%, and 47% respectively, the pH concentration is adjusted 4 through the malic acid content present in the slurry. Experimental results obtained with the proposed chemical mechanical polishing method show a more improved surface quality than previous studies when applying for polishing Ti-6Al-4V alloy. The developed chemical mechanical polishing method's polishing results under optimal conditions obtain an ultra-fine surface quality with Ra = 0.696 nm over a measuring area of 53×70 μm2. X-ray photoelectron (XPS) and electrochemical measurements were used to study the chemical reaction mechanisms in the proposed chemical mechanical polishing process. The chemical mechanical polishing processes for the surface of the Ti-6Al-4V alloy workpiece with the H2O2 oxidizing agent showed high suitability with the reactants formed on the surface such as Ti, V, and Al oxide. With the proposed oxidant and the established chemical mechanical polishing slurry, the feasibility and surface quality of the super smooth Ti-6Al-4V workpiece formed after polishing were demonstrated. The established chemical mechanical polishing method shows high applicability in environmental protection and Ti-6Al-4V alloy ultra-precision machining industries.
    Źródło:
    Journal of Machine Engineering; 2023, 23, 4; 64--76
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparing Shrimp Shell-Derived Chitosan with Rice Husk-Derived Biochar for Efficient Safranin O Removal from Aqueous Solution
    Autorzy:
    Phuong, Do Thi My
    Thao, Nguyen Thi Thanh
    Loc, Nguyen Xuan
    Powiązania:
    https://bibliotekanauki.pl/articles/2202335.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    adsorption
    biochar
    chitosan
    rice husk
    Safranin O
    shrimp shell
    Opis:
    In this study, the shrimp shell-derived chitosan was coated onto rice husk-derived biochar to form chitosan/biochar bio-composite beads. The physicochemical properties of biochar (BC) and chitosan/biochar beads (CS@BC) were characterized by BET, SEM-EDX, FTIR, and pHpzc analyses, which were then tested for their capacity to remove Safranin O (SO) from water. In kinetics, the pseudo-second-order model was found to well represent experimental data, indicating the adsorption was mainly a chemical process. The intra-particle diffusion model was not the sole rate-limiting step, because the results did not pass through the origin. In isotherms, both the Langmuir and Freundlich models described well the equilibrium adsorption data. The CS@BC adsorbent showed adsorption capacity at 77.94 mg/g for SO, which is higher than BC adsorbent with 62.25 mg/g (experimental conditions: pH ~ 7.0, dosage = 0.2 g, contact time = 240 min, and temperature = 298 K). The findings revealed that the biochar-loaded chitosan can improve the adsorption capacity of SO. It is predicted that the enhancement in the functional groups (i.e., -NH2 and -OH groups) of CS@BC could contribute to the electrostatic interactions and the complexation between SO and CS@BC, thereby enhancing the Safranin O adsorption from water.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 1; 248--259
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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