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Search Results: 1 - 10 of 36828 matches for " Ya-Tuan Ma "
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1-[2-(3,5-Difluorobenzyloxy)phenyl]ethanone
Ya-Tuan Ma,Xin-Wei Shi,Qi Shuai,Jin-Ming Gao
Acta Crystallographica Section E , 2010, DOI: 10.1107/s160053681003120x
Abstract: In the title compound, C15H12F2O2, the dihedral angle between the aromatic rings is 70.43 (4)°. The crystal packing exhibits no significantly short intermolecular contacts.
1-[4-(3-Chloropropoxy)-2-hydroxyphenyl]ethanone
Ya-Tuan Ma,Jing-Jing Wang,Xi-Wang Liu,Sheng-Xiang Yang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536809051411
Abstract: The title compound, C11H13ClO3, has been obtained in the reaction of 2, 4-dihydroxylacetonephenone, potassium carbonate and 1-bromo-3-chloro-hexane. The hydroxy group is involved in an intramolecular O—H...O hydrogen bond. The crystal packing exhibits no significantly short intermolecular contacts
1-[4-(3,5-Difluorobenzyloxy)-2-hydroxyphenyl]ethanone
Ya-Tuan Ma,An-Ling Zhang,Mao-Sen Yuan,Jin-Ming Gao
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810033787
Abstract: The title compound, C15H12F2O3, has been obtained by the reaction of 2,4-dihydroxylacetonephenone, potassium carbonate and 3,5-difluorobenzyl bromide. The hydroxy group is involved in an intramolecular O—H...O hydrogen bond in each of the two independent molecules in the asymmetric unit. The dihedral angle between the aromatic rings is 0.5 (2)° in one molecule and 1.9 (2)° in the other. In the crystal, weak C—H...O interactions link the molecules into tetrameric units aligned perpendicular to b.
2,4-Dichloro-6-[2-methoxy-4-(prop-2-en-1-yl)phenoxy]-1,3,5-triazine
Ya-Tuan Ma,Hong-Quan Li,Xin-Wei Shi,An-Ling Zhang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810042418
Abstract: The title compound, C13H11Cl2N3O2, was obtained by the reaction of eugenol and cyanuric chloride. The dihedral angle between the benzene and triazine rings is 87.56 (4)°. Two C atoms of the allyl group are disordered over two sites in a 0.72 (2):0.28 (2) ratio.
2-Chloro-N-methyl-N-[2-(methylamino)phenyl]acetamide
Yu-Bin Bai,Xia-Hui Chen,Ya-Tuan Ma,An-Ling Zhang
Acta Crystallographica Section E , 2013, DOI: 10.1107/s1600536813000494
Abstract: The title compound, C10H13ClN2O, was obtained as a by-product in the reaction of 2-chloromethyl-1H-benzimidazole, dimethyl sulfate and toluene to synthesise 2-chloromethyl-1-methylbenzimidazole. The dihedral angle between the benzene ring and the acetamide group is 89.72 (6)° while that between the aromatic ring and the chloracetyl group is 84.40 (4)°. In the crystal, adjacent molecules are linked by pairs of N—H...O hydrogen bonds into inversion dimers.
4-Allyl-2-methoxyphenyl 3,4-dichlorobenzenesulfonate
Ya-Tuan Ma,Zhao-Feng Gao,Qi-Chao Liu,Gang Jin
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811044163
Abstract: The title compound, C16H14Cl2O4S, was obtained by the reaction of eugenol (4-allyl-2-methoxyphenol) and 3,4-dichlorobenzenesulfonyl chloride. The dihedral angle between the benzene rings in the molecule is 40.53 (4)°. No significantly short intermolecular contacts are observed in the crystal structure.
1-(4-Benzyloxy-2-hydroxyphenyl)ethanone
Ya-Tuan Ma,Chong-Lin Yang,Zhen-Shuo Li,Zhong-Qiang Li
Acta Crystallographica Section E , 2011, DOI: 10.1107/s160053681104637x
Abstract: The title compound, C15H14O3, has been obtained from the reaction of 2,4-dihydroxyacetophenone, potassium carbonate and benzyl bromide. The remaining hydroxy group is involved in an intramolecular O—H...O hydrogen bond. In the crystal, intermolecular C—H...O contacts occur.
Multiple positive solutions for singular m-point boundary-value problems with nonlinearities depending on the derivative
Ya Ma,Baoqiang Yan
Electronic Journal of Differential Equations , 2008,
Abstract: Using the fixed point theorem in cones, this paper shows the existence of multiple positive solutions for the singular $m$-point boundary-value problem $$displaylines{ x''(t)+a(t)f(t,x(t),x'(t))=0,quad 0 Keywords m-point boundary-value problem --- singularity --- positive solutions --- fixed point theorem
Sealing of Ejection Hole at the Bottom of Projectile for Wired Transmission System of Penetration Data
Sealing of Ejection Hole at the Bottom of Projectile for Wired Transmission System of Penetration Data

Huiming Ma,Ya Zhang
- , 2017, DOI: 10.15918/j.jbit1004-0579.201726.0306
Abstract: It is difficult to find the projectile when people want to get the penetration data in a hard recovery method, so a recovery system of penetration data is designed based on an ejection mode from the projectile base and a method of wired transmission, at the same time, the system was sealed with a designed sealing device, the working principle of which was introduced. Using Fluent as the simulation platform, the transient pressure of seal cavity was simulated based on the change of chamber pressure, and steady-state pressure of seal clearance and seal cavity were simulated based on the maximum chamber pressure. The sealing performance was tested by a pressure test system. The results of simulation and experiment show that the maximum pressure of seal cavity is 139.4.kPa when the maximum chamber pressure is 242.9.MPa and the maximum temperature of gunpowder explosive gas is 2.166.5.K, so the sealing performance can be assured. The sealing device can be taken as a reference in sealing research on gunpowder gas at the bottom of projection.
It is difficult to find the projectile when people want to get the penetration data in a hard recovery method, so a recovery system of penetration data is designed based on an ejection mode from the projectile base and a method of wired transmission, at the same time, the system was sealed with a designed sealing device, the working principle of which was introduced. Using Fluent as the simulation platform, the transient pressure of seal cavity was simulated based on the change of chamber pressure, and steady-state pressure of seal clearance and seal cavity were simulated based on the maximum chamber pressure. The sealing performance was tested by a pressure test system. The results of simulation and experiment show that the maximum pressure of seal cavity is 139.4.kPa when the maximum chamber pressure is 242.9.MPa and the maximum temperature of gunpowder explosive gas is 2.166.5.K, so the sealing performance can be assured. The sealing device can be taken as a reference in sealing research on gunpowder gas at the bottom of projection.
A Study of Occupational Noise Exposure among Toll Tellers at Toll Plaza in Malaysia
S. Nadya,S. Z. Dawal,T.M.Y.S Tuan Ya,M. Hamidi
Lecture Notes in Engineering and Computer Science , 2010,
Abstract:
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