Autor: Nguyen, M.-T. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Formation of Different Cu Nanopowders and Stability of Cu Fluids Produced by Electrical Explosion of Wire in Liquid
Autorzy:: Nguyen, M.-T.
Kim, J.-H.
Kim, J.-C.
Tematy:: Cu nanopowder
Cu nanofluids
electrical explosion of wire
stability of nanofluids; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/355217.pdf Link otwiera się w nowym oknie
Opis:: In this study, copper nanoparticles and nanofluids were synthesized by electrical explosion of wire (EEW) in liquid media such as water, ethanol, and acetone. The effect of the different conditions on the properties of the as-synthesized Cu powders and nanofluids were investigated. X-ray diffraction (XRD) analysis was employed to measure the phase of the as-synthesized powder. Only pure Cu phase appeared in case of acetone condition, but CuO and CuO2 phases could be observed in the others. The EEWed particle size was broadened from under 50 to 100 nm. The results showed that acetone was the best condition for achieving smaller particles, preventing the oxidation of the Cu particles and good stability of the nanofluids.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Sintering and Microstructures of SUS 316L Powder Produced by 3D Printing Process
Autorzy:: Kim, W. J.
Nguyen, H.-H.
Kim, H. Y.
Nguyen, M.-T.
Park, H. S.
Kim, J.-C.
Tematy:: stainless steel
3D printing
selective laser sintering
SUS 316L
flake powder; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/356018.pdf Link otwiera się w nowym oknie
Opis:: Selective laser sintering (SLS) is a type of laminating sintering technique, using CO₂ laser with (metal, polymer, and ceramic) powders. In this result, the flake SUS 316L was used to achieve a high porous product, and compare to spherical type. After SLS, the porosity of flake-type sample with 34% was quite higher than that of the spherical-type one that had only 11%. The surface roughness of the flake SLS sample were also investigated in both inner and surface parts. The results show that the deviation of the roughness of the surface part is about 64.40μm, while that of the internal one was about 117.65μm, which presents the containing of high porosity in the uneven surfaces. With the process using spherical powder, the sample was quite dense, however, some initial particles still remained as a result of less energy received at the beneath of the processing layer.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Quail-thrush birds from the Miocene of northern Australia
Autorzy:: Nguyen, J.M.T.
Archer, M.
Hand, S.J.
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:: https://bibliotekanauki.pl/articles/23484.pdf Link otwiera się w nowym oknie
Opis:: Quail-thrushes (Passeriformes: Cinclosomatidae: Cinclosoma) are ground-dwelling corvoid songbirds endemic to Austra lia and New Guinea. Until now, the only known quail-thrush fossils have been from late Quaternary cave deposits in Australia. A new species of quail-thrush, Cinclosoma elachum sp. nov., is described from the early to middle Miocene deposits in the Riversleigh World Heritage Area, Queensland, Australia. A second, larger quail-thrush is identified from the middle Miocene of Riversleigh. The new fossils considerably extend the geographic and temporal ranges of cinclosomatids, and indicate the presence of two species of quail-thrushes in the Miocene of northern Australia, located more than 300 km from the nearest extant member of Cinclosoma. These fossils provide a minimum age of ~18 million years for Cinclosomatidae. They cannot be confidently assigned to the crown group of the genus Cinclosoma, but can be used to calibrate the split between this genus and Ptilorrhoa in molecular dating studies of the Corvides radiation and Passeriformes overall. This material also adds to the growing diversity of songbirds identified from the pre-Pleistocene record of Australia, and reemphasises the global significance of the Riversleigh deposits in developing understanding about the early evolutionary history of passerines.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Development of Solution for Safe Ship Considering Seakeeping PERformance
Autorzy:: Yoon, H.K.
Nguyen, V.M.
Nguyen, T.T.
Tematy:: seakeeping
seakeeping performance
safe ship
safe ship considering
optimal weather routing
container ship
Dynamic Programming (DP)
Changwon National University (CWNU); Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/116617.pdf Link otwiera się w nowym oknie
Opis:: In recent years, safety of a ships has become one important issues needed to solved as soon as possible in ship navigation. Optimal weather routing is one of best solution for ensuring safe operation of a ship with a with short passage time or minimum energy to avoid a certain excessive motion. This paper introduced the development of solution for safety and optimal weather routing a ship considering seakeeping performance based on model test result. This study introduced how to apply A* algorithm based on result of the seakeeping model test for determining the optimal ship routes. Seakeeping model test of 8600 TEU container ship was carried out in Changwon National University's seakeeping basin and its RAOs at various frequencies were used to predict the RMS motion values in irregular waves. The specially modelled path-cost function and the safety constraints were proposed for finding the optimal path of the ship. The comparison of ship performances estimated by great circle’s path and estimated optimal route during the voyage of the ship was investigated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Solution to Reduce Air Environmental Pollution from Ships
Autorzy:: Pham, H.T.
Nguyen, T.M.
Tematy:: Pollution at Sea
Environment Protection
Ecology, MARPOL
Air Environmental Pollution
Gas Emissions
Exhaust Gas Emissions
Exhaust Gas; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/116944.pdf Link otwiera się w nowym oknie
Opis:: Exhaust gas emissions from ships are increasingly polluting the air environment seriously. Therefore, the MARPOL 73/78 Annex VI is applied for all ships from 2017, Annex VI provided that the concentrations of NOx,SOx CO contained in ship’s exhaust gases must be less than 6.4 g/kWh, 0.6 g/kWh, and 5.5g/kWh respectively. Today, there are many solutions to reduce pollution emissions from exhaust gas of ships, such as improving combustion, using oil emulsion, using biofuel,…However, these solutions also have a handful of disadventages such as being unable to thoroughly resoulve problems, high cost, and very difficult to improve the quality of ship exhaust gas emissions for old ships. Exhaust gas treatment method uses a centralized treatment system where exhaust gas from the thermal engines is taken in a centralized treatment system before discharging into the air. After centralized treatment system, in comparision with raw exhaust gas, soot can be reduced by 98%, NOx can be reduced by 75%, SOx can be reduced by 80%. This method of treatment is not only low cost, good quality but also make marine heat-engines still use traditional fuels as well as need not improve its structure.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Indifference pricing with counterparty risk
Autorzy:: Ngo, M.
Nguyen, T.
Duong, T.
Tematy:: indifference pricing
counterparty risk
minimal entropy
BSDE
ryzyko kontrahenta
entropia minimalna; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200331.pdf Link otwiera się w nowym oknie
Opis:: We present counterparty risk by a jump in the underlying price and a structural change of the price process after the default of the counterparty. The default time is modeled by a default-density approach. Then we study an exponential utility-indifference price of an European option whose underlying asset is exposed to this counterparty risk. Utility-indifference pricing method normally consists in solving two optimization problems. However, by using the minimal entropy martingale measure, we reduce to solving just one optimal control problem. In addition, to overcome the incompleteness obstacle generated by the possible jump and the change in structure of the price process, we employ the BSDE-decomposition approach in order to decompose the problem into a global-before-default optimal control problem and an after-default one. Each problem works in its own complete framework. We demonstrate the result by numerical simulation of an European option price under the impact of jump’s size, intensity of the default, absolute risk aversion and change in the underlying volatility.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Możliwości i opłacalność wykorzystania ścieków szarych do nawadniania roślin
Feasibility and economic efficiency of greywater reuse for plant irrigation
Autorzy:: Nguyen, T. H.
Błażejewski, R.
Spychała, M.
Tematy:: wykorzystanie ścieków
nawadnianie
woda wodociągowa
ścieki szare
życica trwała
greywater reuse
irrigation
tap water
greywater
perennial ryegrass; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/401811.pdf Link otwiera się w nowym oknie
Opis:: Celem badań była ocena wpływu użycia ścieków szarych (surowych i oczyszczonych) do nawadniania trawy (życica trwała, Lolium perenne), wyhodowanej na drobnym piasku, na przyrost biomasy w okresie 4 miesięcy. Zastosowano trzy rodzaje cieczy do nawadniania (woda wodociągowa, surowe ścieki szare i oczyszczone ścieki szare) w na dwóch poziomach dawek częściowych: niskim i wysokim (5 i 15 mm na tydzień), w dawkach całkowitych o wysokości 15, 25, 35 i 45 mm na tydzień. Ścieki surowe z pralki, kąpieli w wannie i mycia rąk charakteryzowały się następującymi wskaźnikami: ChZT - 247 ± 33 mg O₂·dm^-3, BZT₅ - 81 ± 12 mg O₂·dm^-3, azot całkowity - 7,2 ± 0,9 mg N·dm^-3 i fosfor całkowity - 4,7 ± 0,7 mg P·dm^-3, zaś ścieki oczyszczone odpowiednio: 81 ± 12 mg O₂·dm^-3, 23 ± 6 mg O₂·dm^-3, 4,8 ± 0.9 mg N·dm^-3, 2 ± 0,2 mg P·dm^-3. Wyniki badań wykazały, że wzrost nadziemnej biomasy jest zależny od całkowitej dawki cieczy w zakresie 15 do 45 mm na tydzień. Średni przyrost biomasy trawy podlewanej wodą wodociągową, ściekami oczyszczonymi i ściekami surowymi dla dawki częściowej 5 mm na tydzień (w ramach dawek całkowitych 15-45 mm na tydzień) wyniósł 40,5 ± 7,5, 39,1 ± 7,3, 42,8 ± 6,0 mg s.m., odpowiednio, a dla dawki częściowej 15 mm na tydzień: 52,6 ± 7,8, 54,0 ± 7,5, 50,3 ± 9,2 mg s.m., odpowiednio. Różnica przyrostu suchej biomasy nawadnianej oczyszczonymi ściekami szarymi dawką częściową 5 mm na tydzień i dawką częściową 15 mm na tydzień (na korzyść tej wyższej) była większa niż dla pozostałych rodzajów cieczy; była też istotna statystycznie (p > 6%). Badania wykazały, że surowe i oczyszczone ścieki szare, mogą stanowić alternatywę dla wody wodociągowej w kontekście nawadniania trawnika, nie wywierając negatywnego wpływu na przyrost biomasy.
The study was conducted on grass (Lolium perenne) grown on fine sand in pots to evaluate the effect of greywater reuse on total dry biomass of grass during 4 months. The experiment has been designed as full factorial with total water load: 15, 25, 35 and 45 mm·week^-1. Three categories of irrigation water (tap water, treated greywater, raw greywater) were tested in conditional combination with two levels for each category that is the low and high level at 5 and 15 mm·week^-1, respectively. The COD, BOD₅, total nitrogen, total phosphorus is 247 ± 33 mg·dm^-3, 81 ± 12 mg·dm^-3, 7.2 ± 0.9 mg·dm^-3, 4.7 ± 0.7 mg·dm^-3 of raw greywater and 81 ± 12 mg·dm^-3, 23 ± 6 mg·dm^-3, 4.8 ± 0.9 mg·dm^-3, 2 ± 0.2 mg·dm^-3 of treated greywater, respectively. The results showed that the dry biomass yields increase when increasing total irrigation water dose from 15 to 45 mm·week^-1. The dry biomass yields at 5 mm·week^-1 share of tap water, treated greywater, or raw greywater in total irrigation water doses 15-45 mm·week^-1 were equal to 40,5 ± 7,5, 39,1 ± 7,3, 42,8 ± 6,0 mg d.m. and at 15 mm·week^-1 partial dose: 52,6 ± 7,8, 54,0 ± 7,5, 50,3 ± 9,2 mg d.m. per pot, respectively. The increase in dry biomass yield of grass irrigated with treated greywater (partial dose from 5 to 15 mm·week^-1) was higher and more significant (p = 0.13, 0.06, 0.37) than in the two other cases. The study concludes that treated greywater, raw greywater can be a partial or complete replacement for tap water without compromising ryegrass biomass yield.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Effects of the thermomechanical treatment on the microstructure and mechanical properties of ferrite–martensite dual phase steel
Autorzy:: Ha, M. T.
Pham, M. K.
Nguyen, H. H.
Tematy:: dual-phase steel
ferrite
austenite
martensite
thermomechanical treatment
mechanical properties
stal dwufazowa
ferryt
austenit
martenzyt
obróbka termomechaniczna
właściwości mechaniczne; Pokaż więcej
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Powiązania:: https://bibliotekanauki.pl/articles/59116146.pdf Link otwiera się w nowym oknie
Opis:: Purpose: The study aims to investigate the effects of thermomechanical treatment, including tempering and hot–rolling, on the microstructure and mechanical properties of ferrite–martensite dual phase steel. Design/methodology/approach: The initial steel billet was a hypoeutectoid steel, which was annealed at 1000ºC, then hot–rolled at 920ºC, followed by austenitisation at various temperatures (730, 770, 800, and 830ºC), and finally quenched to obtain ferrite–martensite dual phase steel. X-ray diffractometer and optical microscopy investigated the microstructure and grain size of the dual-phase steel. Mechanical properties such as hardness, elongation, and tensile strength were also examined. Findings: The grain size decreased with increasing elongation percentage and remained constant after an elongation of 30%. The martensite/ferrite phase ratio increased with higher tempering temperatures. The hardness, elongation, and tensile strength reached a maximum when the tempering temperature was 800ºC. Research limitations/implications: Future studies could consider the effect of hot–rolling temperature or cold-rolling. Practical implications: The study proposes a straightforward and efficient thermomechanical treatment process to transform hypereutectoid steel into ferrite-martensite dual-phase dual- phase steel with improved mechanical properties. Originality/value: The study reveals the contributions of grain size and the martensite/ferrite ratio to the mechanical properties of ferrite–martensite dual steel through thermomechanical treatment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Luminescence Spectra of ZnAl$\text{}_{2}$O$\text{}_{4}$:Cr$\text{}^{3+}$ Spinel Nanopowders
Autorzy:: Luc, H. H.
Nguyen, T. K.
Nguyen, V. M.
Suchocki, A.
Kamińska, A.
Le, V. K.
Nguyen, V. H.
Luong, T. T.
Tematy:: 78.60.-b
72.80.Ga
81.05.Je
81.05.Mh; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2037040.pdf Link otwiera się w nowym oknie
Opis:: The synthetic ZnAl$\text{}_{2}$O$\text{}_{4}$ spinels doped with Cr$\text{}^{3+}$ ions are prepared from ZnSO$\text{}_{4}$, Al$\text{}_{2}$(SO$\text{}_{4}$)$\text{}_{3}$, and Cr$\text{}_{2}$(SO$\text{}_{4}$)$\text{}_{3}$. The spinel single phase is detected from X-ray diffraction. Luminescence properties of Cr$\text{}^{3+}$ in ZnAl$\text{}_{2}$O$\text{}_{4}$ were studied by low temperature luminescence and decay measurements. Four luminescence lines at 14570, 14520, 14460, and 14330 cm$\text{}^{-1}$ were found to originate from structure distortion and the line at 14175 cm$\text{}^{-1}$ - from chromium pairs. The broad emission band at about 13540 cm$\text{}^{-1}$ is considered to arise from a new Cr$\text{}^{3+}$ center in ZnCr$\text{}_{2}$O$\text{}_{4}$.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Recovery of HCL from chloride leach solution of spent HDS catalyst by solvent extraction
Autorzy:: Banda, R.
Nguyen, T.H.
Lee, M.S.
Tematy:: HCl
extraction
stripping
recovery
TEHA
wydobycie; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/185588.pdf Link otwiera się w nowym oknie
Opis:: In the present work, amine based extractant and its mixture with cationic and solvating extractants were tested for the extraction of HCl from chloride solution containing Al(III). The chloride feed solution resulted from the leaching of spent HDS (hydro-desulfurization) catalysts. For this purpose, amine extractants, such as TOA (trioctyl amine), Alamine 336 (a mixture of tri-octyl/decyl amine), Alamine 308 (tri-isooctyl amine), and TEHA (tri 2-ethylhexyl amine) were used and the extraction and stripping behavior of HCl was compared. The extracted HCl was easily stripped from loaded TEHA phase, when compared with the other tested tertiary amine system. Solvent extraction reaction of HCl by TEHA was determined from the extraction data. Unlike TOA and Alamine 336, adding cationic extractant to TEHA had negligible effect on the extraction and stripping of HCl. In our experimental ranges, no Al was extracted by amines and pure HCl was recovered. MaCabe-Thiele diagrams for the extraction and stripping of HCl by TEHA were constructed.
Dostawca treści:: Biblioteka Nauki

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