256 research outputs found
S.E. Tran Thanh Dat : nouveau Ministre de l'Education nationale
No full text[ndlr] Reproduction de l'article biographique dédié au lettré Trần Thanh Đạt paru dans Indochine hebdomadaire illustré (1942). Né le 18 décembre 1891 au village de Tiên-nôn, canton de Mâu-tài, huyên de Phu-vang, province de Thua-thiên, de feu Tran-Nha, Quang-lôc-tu-khanh, et de feue Mme Huynh-thi-Diêu, S. E. Tran-thanh-Dat a fait de brillantes études qui l'ont conduit successivement au diplôme de l'Enseignement franco-annamite, obtenu en 1908, à l’École de Droit et d'Administration de Hanoi,..
S.E. Tran Thanh Dat : nouveau Ministre de l'Education nationale
No full text[ndlr] Reproduction de l'article biographique dédié au lettré Trần Thanh Đạt paru dans Indochine hebdomadaire illustré (1942). Né le 18 décembre 1891 au village de Tiên-nôn, canton de Mâu-tài, huyên de Phu-vang, province de Thua-thiên, de feu Tran-Nha, Quang-lôc-tu-khanh, et de feue Mme Huynh-thi-Diêu, S. E. Tran-thanh-Dat a fait de brillantes études qui l'ont conduit successivement au diplôme de l'Enseignement franco-annamite, obtenu en 1908, à l’École de Droit et d'Administration de Hanoi,..
Aqueous uranium activity removal by CoFe2O4 nanoparticles
No full textCobalt ferrite (CoFe2O4) nanoparticles have been prepared by the method of spraying-co-precipitation. The advantages of this approach are high productivity, excellent repeatability and high magnetic performances of the fabricated materials. The obtained materials were characterized by different techniques as X-ray diffraction, transmission electron microscopy, scanning electron microscopy. It was shown that CoFe2O4 has the face-centered cubic trevorite structure and particle size of about 18 nm. The vibrating sample magnetometer measurement had shown that obtained material had saturation magnetization of about 40 emu/g, remanences was 14 emu/g, and coercive forces (Hc) was 0.9 kOe. An investigation of uranium adsorption onto CoFe2O4 magnetic nanoparticles was studied in this research. This was confirmed by our experimental results using the method of inductively coupled plasma mass spectrometry. The pH effect, adsorption kinetics, and adsorption isotherms were examined in batch experiments. The sorption isotherm agreed well with the Langmuir model, having a maximum sorption capacity of 53.36 mg/g at pH = 6 and T = 298 K. Present research might eventually lead to a simple and low-cost method for fabricating magnetic materials and application for efficient removal of uranium from aqueous solution.(Copied from article
Tu Sach Me Ke Con Nghe: Struyen Co Tich - Ngo Ngon Hay Nhyat The Gioi Qua Nhieu The Ky #7
No full textSome of the illustrations--and presumably the stories--in this colorful paperback book about 7 x 6½ repeat from the smaller booklets I found in the same store at the same time. Here we have familiar story lines and familiar paintings for DLS, which supplies the front-cover illustration; BW; The Rooster, the Dog, and the Fox; the story of the cat and dog bringing the piece of meat over which they have been fighting to the fox as arbitrator, who eats it all; and AD. The smaller iconic illustrations here are at the lower right on the right-hand page, while the left-hand page presents the full-page illustration.Language note: VietnameseNarrated by Dinh Thuy Tien Sachi, Din Tra My, Tran Ha Anh, and Ngo Quang Hu
Figure 1 from: Tran TB, Han LN, Hai DV, Quang BH, Huong NTT, Ha BT, Hai TV, Rodda M (2020) Heterostemma cucphuongense (Apocynaceae, Asclepiadoideae), a new species from Vietnam. PhytoKeys 148: 119-124. https://doi.org/10.3897/phytokeys.148.50029
No full textFigure 1 Heterostemma cucphuongense T.B.Tran & Rodda A flowering branch B flower, view from above (adaxial) C flower, from underneath D corona, from above E ovary F pollinarium. (Photographs by N.Q. Dat, T.B. Tran, Thuong V.A., photo edit by M. Rodda
Coeliccia bhriulieci To & Phan & Tran 2017, sp. nov.
No full textCoeliccia bhriulieci sp. nov. (Figs 1–3) Holotype. ♂ (Zoological collection of the Southern Institute of Ecology, Vietnam Academy of Science and Technology, Ho Chi Minh City, Vietnam), 15 ° 44’850’’ N, 107 ° 14’237’’ E, 1,299 m a.s.l., Gari commune, Tay Giang district, Quang Nam Province, central Vietnam, 26.X.2016, V.Q. To leg. Paratypes. 4♂, same date, locality as holotype; 2♂, same locality, 24.VII.2016; 2♂, 15 ° 53’284’’ N, 107 ° 21’585’’ E, 1,899 m a.s.l., Tr’hy commune, Tay Giang district, Quang Nam Province, central Vietnam, 14.IV.2016, V.Q. To leg. Three paratypes from Gari are deposited in the personal collections of the second author and the remainder are in the collection of the first author. Etymology. The new species is named after Mr. Bh’riu Liec, leader of the indigenous Co Tu minority people, without whose support our project would not have been possible; bhriulieci, a noun in the genitive case. Description of holotype. Head (Fig. 2 a-b). Labrum and postclypeus shining black; labium yellow becoming black anteriorly; anteclypeus yellow with two separated black spots; mandibles and genae pale yellowish, this pattern extending to just above postclypeus; antennae black except for yellow apical part of the first segment; epicranium matte black with a yellow spot between lateral ocellus and base of antenna; rear of head black with a transversely elongated postocular spot. Thorax (Fig. 2a, c–d). Dorsum of prothorax including anterior and posterior lobes entirely black; middle lobe black with traces of yellow laterally; posterior lobe unmodified, curved slightly upward in lateral view (Fig. 2 c-d); notopleural suture and propleuron yellow (Fig. 2a). Synthorax: mesepisternum black with a narrow yellow antehumeral stripe; mesepimeron black extending through middle of mesinfraepisternum of which the ventral part is blue; metepisternum, metinfraepisternum and metepimeron mostly blue with black as follows: narrow black subalar ridge extending from black upper end of mesepimeron to metapleural stripe, the latter slightly touching ventral end of metathoracic spiracle and extending ventrally along anterior margin of metinfraepisternum (Fig. 2a). Legs (Fig. 2a). Coxae and trochanters yellow; femora and tibiae yellow with flexor and extensor surfaces black; tarsi and spines black. Wings hyaline with black venation. Px 17–18 in FW and 15–16 in HW respectively. Pterostigma brown with narrow pale margin, covering 1.5–2 cells. Abdomen (Fig. 1). Black dorsally, pale yellow ventrally with yellow extending as follows: most of S1 except for black apical annulus, dorsal stripe extending to distal half on S2; S3–6 with semicircular expansion just before the posterior end of each segment; S7–S8 largely black excluding ventral narrow yellow stripe in S7 and a yellow marking on lateral sides of S8; S9–10 blue with black on ventral base of S9 and S10. Genital ligula (Fig. 3 d-e) with posterior segment quadrate in ectal view, with two long, recurved and slightly spatulate flagella lateroapically, each extending posteriorly with tip slightly recurved. Anal appendages (Fig. 3 a-c) entirely black, cercus as long as S10, and armed with a subapical black tooth. Paraproct slightly longer than cercus, tip acutely curved medioventrally. Measurements (in mm). HW 25; abdomen + caudal appendages 40. Female. Unknown. Variation in paratype males. Paratype males show little variation compared to holotype. In some specimens, synthorax laterally pale blue or pale yellow, not blue as in holotype. Middle lobe of prothorax entirely black, not yellow marking as in holotype. Measurements range 24–26.5 mm (HW) and 38–42.5 mm for abdomen + appendages. Differential diagnosis. The following combination of morphological characters separates C. bhriulieci from other Southeast Asian Coeliccia species: largely pale blue synthoracic pattern with narrow yellow antehumeral stripe, appendages black, and genital ligula with a pair of long recurved flagellae originating apicolaterally on largely quadrate terminal segment. Coeliccia bhriulieci shares some characters with the following Vietnamese congeners: C. cyanomelas, C. mientrung and C. pyriformis. The synthorax of all four have blue colouration which in C. bhriulieci mainly occupies the metepisternum and metepimeron (Fig. 2a) while in other three species the blue extends on to the mesepimeron thus forming a wide arch (C. pyriformis, C. mientrung) (Fig. 1A, E, p. 132 in Kompier & Phan 2017) or extends anteriorly into the middle of it (C. cyanomelas) (Fig. 10c, p. 269 in Steinhoff & Uhl 2015); antehumeral stripe in C. bhriulieci is a line more than two times narrower and much longer (reaching the alar ridge) than that of the other species; S9–10 is blue in C. bhriulieci and C. cyanomelas (Fig. 1 in this paper and Fig. 10d-f, p. 269 in Steinhoff & Uhl 2015) but is yellow in C. pyriformis and C. mientrung (Fig. 1B, F, p. 132 in Kompier & Phan 2017); anal appendages are black in C. bhriulieci but blue in C. cyanomelas and yellow in both C. pyriformis and C. mientrung; genital ligula lacks flap-like fold in C. bhriulieci (Fig. 3 d-e) and C. cyanomelas (Fig. 8c-d, p. 267 in Steinhoff & Uhl 2015) whereas the flap is well developed at the apical end in both C. pyriformis and C. mientrung (Fig. 2 A-B, p. 133 in Kompier & Phan 2017). Habitat and ecology. The new species was found in two different habitats within the high mountain forest. At Tr’hy (1,899 m a.s.l.), the habitat was a narrow (about 2–3 m) swampy shallow stream with a sandy bottom shaded by bushy vegetation. This habitat is shared with Caliphaea thailandica Asahina, 1976. The stream in Gari (1,299 m a.s.l.) was mostly exposed (6–8 m) with a gravel bottom with large rocks and low vegetation along the sides. Only one other congeneric species, the widespread Coeliccia scutellum Laidlaw, 1932, was found here.Published as part of To, Van Quang, Phan, Quoc Toan & Tran, Van Bang, 2017, Description of Coeliccia bhriulieci sp. nov. (Odonata: Zygoptera: Platycnemididae) from central Vietnam, pp. 279-282 in Zootaxa 4341 (2) on pages 279-281, DOI: 10.11646/zootaxa.4341.2.9, http://zenodo.org/record/103950
Taxonomic characterization and identification of Saccharomyces cerevisiae D8 for brandy production from pineapple
No full textEight yeast strains (denoted as D1 to D8) were isolated from samples of natural fermented pineapple. Strain D8 showed highest alcoholic production at low pH and special aroma of pineapple has been chosen for further study. Taxonomic characterization of strain D8 using morphological, biochemical and molecular biological studies confirmed that strain D8 belong to Saccharomycetaceae family, Saccharomycetales order and Saccharomyces cerevisiae species. Therefore, we named this strain as Saccharomyces cerevisiae D8 for further study on Brandy production from pineapple. Citation: Hoang Thi Le Thuong, Nguyen Quang Hao, Tran Thi Thuy, 2017. Taxonomic characterization and identification of Saccharomyces cerevisiae D8 for brandy production from pineapple. Tap chi Sinh hoc, 39(4): 474- 482. DOI: 10.15625/0866-7160/v39n4.10864.*Corresponding author: [email protected] Received 5 December 2016, accepted 12 August 2017</jats:p
A modeling to understand where a vertical crack can propagate in pavements
No full textInternational audienceTo understand how a pre-existing vertical crack can propagate and damage pavements an alternative modeling is proposed to be used. For the multilayered pavement structures, the simplified modelling, named the multi-particle model of multi-layer materials (M4) with 5n equilibrium equations (n: number of pavement layers) is linked to the Boussinecq solution for the soil (Tran, 2004) (Chabot et al., 2005). This approach has the advantage of reducing the real 3D problem to the determination of regular plane fields (x,y) per layer and interface. Heavy loads, thermal loadings and thermal shrinkage phenomena have been integrated and validated with respect to finite element computations. It shows that the bond between layers near vertical cracks is damaged by normal and shear stresses. These combined effects are proposed to be medeled to understand corner crack initiation phenomenon of cemented concrete slab. Surface observations on concrete pavements with joints help the discussion
A modeling to understand where a vertical crack can propagate in pavements
No full textInternational audienceTo understand how a pre-existing vertical crack can propagate and damage pavements an alternative modeling is proposed to be used. For the multilayered pavement structures, the simplified modelling, named the multi-particle model of multi-layer materials (M4) with 5n equilibrium equations (n: number of pavement layers) is linked to the Boussinecq solution for the soil (Tran, 2004) (Chabot et al., 2005). This approach has the advantage of reducing the real 3D problem to the determination of regular plane fields (x,y) per layer and interface. Heavy loads, thermal loadings and thermal shrinkage phenomena have been integrated and validated with respect to finite element computations. It shows that the bond between layers near vertical cracks is damaged by normal and shear stresses. These combined effects are proposed to be medeled to understand corner crack initiation phenomenon of cemented concrete slab. Surface observations on concrete pavements with joints help the discussion
Investments in cryptocurrencies: how risky are they?
No full textAuthor Jiří Málek acknowledges the financial support of Czech Science Foundation with grant GAČR 18-05244S “Innovative Approaches to Credit Risk Management” and Institutional support IP 100040/1020. Author Tran van Quang is grateful for the financial support of grant GAČR 18-05244S “Innovative Approaches to Credit Risk Management” of Czech Science Foundation.The article analyzes the probability distribution of returns of the daily data of four cryptocurrencies (Bitcoin, Ethereum, Ripple,Litecoin). Alpha-stable distribution and normal inverse Gaussian distribution (NIG) are used as approximation of the empirical distribution of log-returns as they allow to capture the "power" tails. First basic information about all four cryptocurrencies are given, followed by definition of alpha-stable distribution and normal inverse Gaussian distributions which is special case of generalized hyperbolic distribution. These distributions are used to approximate empirical distributions of these cryptocurrencies. The difference between these two distributions is that the stable distribution can model heavier ends than the NIG (NIG has so called semi-heavy tails). The parameters are estimated using MLE (Maximum Likelihood Estimation) method, which has proved to be the most accurate one. First, we compare the empirical distribution of Bitcoin with NIG and alpha-stable distribution (the stable distribution appears to be much more accurate than the NIG). Then the only stable distribution is used and its parameters are searched for all four cryptocurrencies. α of all cryptocurrencies is close to one, which means that the probability distribution is
similar to Cauchy one. The smallest α (and therefore the fattest tail) has Litecoin, followed by Ripple, Bitcoin, and the highest α of Ethereum. On the other hand, Ethereum has the highest sample volatility
- …
