Time filter

Source Type

Li Y.,Hunan Urban Construction College | Gong S.,Xiangtan University | Pang X.,Xiangtan University | Pang X.,Hunan Food and Drug Vocational College
Jixie Qiangdu/Journal of Mechanical Strength | Year: 2013

The axisymmetric simplified model of tubesheet structure, that is equivalent tubesheet and shell element model, is presented to deal with the problems that modeling is complicated and solving is difficult for tubesheet structure of large heat exchanger, in which a series of same thickness and thin wall cylinders are used to replace tube to tubesheet supporting role in according to the equal principle of support stiffness, and strengthening effect of pipe wall thickness is considered by combining with multi-scale homogenization method. The influence of the number of shell element on calculating accuracy of axisymmetric model was discussed. The computational results of axisymmetric model were compared with the one of solid model, and stress evaluation was carried out. The results obtained show that the simplified model presented can not only meet the requirement of engineering, and also effectively save computational cost. Thus, the proposed simplified model could provide a theoretical reference for design by stress of tubesheet structure.


Huang Y.,Hunan Food and Drug Vocational College | Xiang D.-B.,Hunan University | Hu Q.-M.,Hunan University | Tan Y.,Hunan University | And 2 more authors.
Chinese Traditional and Herbal Drugs | Year: 2014

Objective: To investigate the compouds from methylene dichloride and n-butyl alcohol parts of 70% ethanol extract of the fruits of Euscaphis fukienensis. Methods: The compounds were isolated and purified by Sephadex LH-20, silica gel column chromatographies, and recrystallization. Their structures were identified by physicochemical properties and spectroscopic methods. Results: Ten compounds were isolated and identified as 1, 2-benzenedicarboxylic acid (1), butanedioic acid (2), gallic acid (3), isorhamnetin-3-O-glucoside (4), 4-hydroxy-benzoic acid (5), 2-methyl-5, 7-dihydroxychrom one (6), muconic acid (7), quercetin-3-O- glycosidase (8), β-sitosterol (9), and daucostrol (10). Conclusion: Compounds 1-7 are isolated from the fruits of E. fukienensis for the first time. ©, 2014, Editorial Office of Chinese Traditional and Herbal Drugs. All right reserved.


Duan L.-D.,Shaoyang University | Lin Y.,Shaoyang University | Lin Y.,Hunan Food and Drug Vocational College
Bangladesh Journal of Plant Taxonomy | Year: 2013

A new species of Elatostema J. R. Forst. & G. Forst. (Urticaceae), E. bioppositum L. D. Duan & Y. Lin, is described and illustrated from Guangxi, China. This species was found growing in evergreen broad-leaved forests in limestone hills at altitudes of 410-550 m. The new species is related to E. oppositum Q. Lin & Y. M. Shui, but differs from the latter by stipule linear, lanceolate-linear or lanceolate, 12-25 mm long, 2.0-4.5 mm wide; leaf blade green after drying; male inflorescence 15-30 mm in diameter and peduncle 2-3 mm long; and female inflorescence 7-15 mm in diameter. © 2013 Bangladesh Association of Plant Taxonomists.


Duan L.-D.,Shaoyang University | Lin Y.,Hunan Food and Drug Vocational College | An M.,Guizhou University | Bi H.-Y.,Shaoyang University
Bangladesh Journal of Plant Taxonomy | Year: 2015

Elatostema magni-auriculatum, a new species from Guangxi Zhuangzu Zizhiqu, China is described and illustrated. The species is related to E. myrtillus (Lévl.) Hand.- Mazz., but differs from the latter by stems longitudinally angled, stipules linearlanceolate, leaf blade obliquely ovate or obliquely ovate-elliptic, and staminate perianth lobes oblong-cymbiform. © 2015 Bangladesh Association of Plant Taxonomists.


Lin Y.,Hunan Food and Drug Vocational College | Duan L.D.,Shaoyang University | Bi H.Y.,Beijing Museum of Natural History
Bangladesh Journal of Plant Taxonomy | Year: 2014

Based on examination of specimens of Elatostema J. R. Forster & G. Forster (Urticaceae) from Vietnam, Elatostema albopilosum W.T. Wang var. vicinum L. D. Duan & Y. Lin, a new variety collected from Bac Can Province and Tuyen Quang Province, Vietnam, is described and photographed. This new variety has glabrous stems, glabrous leaves and glabrous peduncles which differs from var. albopilosum that having sparsely puberulent leaf blade on abaxial surface along veins and sparsely strigillose leaf blade on adaxial surface, and short pilose peduncles. E. integrifolium (D. Don) Wedd. and E. pseudodissectum W. T. Wang, two species previously known from Vietnamese adjacent countries, are newly recorded from Ninh Binh Province and Tam Dao National Park, Vietnam, respectively. The vouchers are kept in the Herbarium (PE) of Institute of Botany, Chinese Academy of Sciences, Beijing, China, and their descriptions and photographs are also provided. © 2014 Bangladesh Association of Plant Taxonomists.


Yuan L.,Central South University of forestry and Technology | Wu G.,Hunan Food and Drug Vocational College | Tian G.,Chinese People's Liberation Army | Hu Y.,Central South University of forestry and Technology
Advanced Materials Research | Year: 2012

The synergistic flame-retarded effects of a similar molecular sieve [Co5(OH)2(tca)2(ina)2 (H2O)2] 4H2O(Co5) and ammonium polyphosphate(APP) on cottonwood was studied. Compared with APP added individually, when the addition of Co5 was 1.7%, THR reduced 18.3% and the mass loss reduced 7.7%. The TGA showed that the processes of losing solvent water, coordinated water, tricarballylic acid and isonicotinic acid ligands can inhibit burning and lower the weightlessness rate. The flame retardancy of APP/Co5 was superior to that used APP individually, Co5 showed good synergistic flame-retarded effects. © (2012) Trans Tech Publications, Switzerland.


Yuan L.-P.,Central South University of forestry and Technology | Wu G.-Y.,Hunan Food and Drug Vocational College | Hu Y.-C.,Central South University of forestry and Technology
Chemistry and Industry of Forest Products | Year: 2013

The synergistic flame-retarded effects of a similar molecular sieve [Co5(OH)2(tca)2(ina)2 (H2O)2]·4H2O(Co5) and ammonium polyphosphate(APP) on cottonwood was studied by cone calorimeter. The results showed that compared with APP added individually, the combination of Co5 and APP was led to the reduction of total heat release (THR) to 18.3%, the mass loss to 7.7%, y(CO2) to 22.8 g/kg and y(CO) to 12.3 g/kg, respectively. The TGA and XRD analysis also showed that the generation of tricarballylic acid and isonicotinic acid ligands under high temperature. It can promote the decomposition of the APP and help to inhibit burning and lower the weightlessness rate. Thus, the flame retardancy of s-APP/Co5 was superior to s-APP. Co5 showed good effects on the APP flame retarded cottonwood.

Loading Hunan Food and Drug Vocational College collaborators
Loading Hunan Food and Drug Vocational College collaborators