Sex into the Center Ring

Been studying the interactions between graphene - like aluminium nitride P(AlN)21 nano ribbons doped and defect (AlN)21Sheet, Molecules and small toxic gas molecules ( H2S), were built for two different adsorption sites on graphene like aluminium nitride P(AlN)21. this was done by employing B3LYP density functional theory (DFT) with 6-31G*(d,p) using Gaussian 09 program, Gaussian viw5.0 package of programs and Nanotube Modeller program 2018. the adsorptions of H2S on P(AlN)21, (C) atoms-doped P(AL-N)20 sheet, D-P(AL-N)20 and D-(C)atoms-doped P(AL-N)19 (on atom) with (Ead) (-0.468eV),(-0.473 eV), (-0.457 eV), (-0.4478 eV) and (-0.454 eV), respectively, (Ead) of H2S on the center ring of the P(AL-N)21, (C) atoms-doped P(AL-N)20 sheet, D-P(AL-N)20 and D-(C,B)atoms-doped P(AL-N)19 sheet are (-0.280 eV),(-0.465 eV), (-0.405 eV), (-0.468 eV) and -0.282 eV), respectively, are weak physisorption . However, the adsorptions of H2S, on the ((AlN)20 -B and D- (AlN)19 -B), (on atom N and center ring the sheet) are a strong chemisorption because of the (Ead) larger than -0.5 eV, due to the strong interaction, the ((AlN)20-B and D-(AlN)19-B), could catalyst or activate, through the results that we obtained, which are the improvement of the sheet P(AlN)21 by doping and per forming a defect in, it that can be used to design sensors. DOI: http://dx.doi.org/10.31257/2018/JKP/2020/120210

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Strong influence of nonlocal nonequilibrium effects on the dynamics of the order parameter in a phase-slip center: Ring studies

Physical Review B ◽

10.1103/physrevb.81.184521 ◽

2010 ◽

Vol 81 (18) ◽

Cited By ~ 5

Author(s):

D. Y. Vodolazov ◽

F. M. Peeters

Keyword(s):

Order Parameter ◽

Strong Influence ◽

Phase Slip ◽

Nonequilibrium Effects ◽

Center Ring

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HINDERED CONFORMATIONAL ISOMERIZATION OF 9,10-DIHYDRO-9,9-DIMETHYL-10-METHYLENEANTHRACENES

Canadian Journal of Chemistry ◽

10.1139/v64-083 ◽

1964 ◽

Vol 42 (3) ◽

pp. 565-571 ◽

Cited By ~ 17

Author(s):

D. Y. Curtin ◽

C. G. Carlson ◽

C. G. McCarty

Keyword(s):

Room Temperature ◽

Methyl Groups ◽

Conformational Isomerization ◽

Methylene Carbon ◽

Methyl Group ◽

First Order ◽

Methylene Carbon Atom ◽

Center Ring ◽

Bromo Compound ◽

Dibromo Derivative

While the n.m.r. spectrum of 10,10-dimethyl-9-methylene-9,10-dihydroanthracene (I) shows the geminal methyl group absorption as a sharp singlet the spectrum of the dibromo derivative, 10,10-dimethyl-9-dibromomethylene-9,10-dihydroanthracene (II) shows the methyl absorptions as two sharp well-separated peaks at room temperature which coalesce at 91°. 10,10-Dimethyl-9-phenylbromomethylene-9,10-dihydroanthracene (III), and the methyl ester (V) of IV show a broad geminal methyl spectrum at room temperature which separates to a doublet at lower temperatures and sharpens to a singlet at higher temperatures. Rate constants for the first-order processes responsible for the change in spectrum of II, III, and V have been calculated at the coalescence temperatures to be 57 (364 °K), 35 (305 °K), and 61 (300 °K) sec−1, respectively. The ΔH≠'s were used to extrapolate the rates to 305° to give values of 1, 40, and 100 sec−1, respectively. The process being studied is inferred to be the equilibrium between two boat conformations of the center ring in the dihydroanthracene system, rapid interconversion leading to identical environments for the two methyl groups. A comparison with the geometrically similar o,o′-disubstituted biphenyl racemization gives support for this explanation. A number of compounds with a proton and one substituent on the methylene carbon atom of I (substituents: bromine, chlorine, phenyl, carboxy, carbomethoxy, phenylmercapto) and also 10,10-dimethyl-9-phenylcarbomethoxymethylene-9,10-dihydroanthracene (XII) showed a single methyl absorption at room temperature. The methyl spectrum of the mono bromo compound VI did not broaden at temperatures down to 246 °K.

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Putting Medical Devices in the Center Ring

Journal of Clinical Engineering ◽

10.1097/jce.0b013e31820c5e6c ◽

2011 ◽

Vol 36 (1) ◽

pp. 16

Author(s):

&NA;

Keyword(s):

Medical Devices ◽

Center Ring

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ENDANGERED SPECIES: Elephants Take Center Ring at CITES

Science ◽

10.1126/science.316.5832.1678a ◽

2007 ◽

Vol 316 (5832) ◽

pp. 1678a-1679a

Author(s):

V. Morell

Keyword(s):

Endangered Species ◽

Center Ring

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Performance Evaluation of Allergen Exposure Assessment using Fluorescent Multiplex Array Technology: - A Multi-Center Ring Trial

Journal of Allergy and Clinical Immunology ◽

10.1016/j.jaci.2008.12.801 ◽

2009 ◽

Vol 123 (2) ◽

pp. S210-S210 ◽

Cited By ~ 1

Author(s):

E.M. King ◽

S. Filep ◽

B. Smith ◽

N. Metwali ◽

P.S. Thorne ◽

...

Keyword(s):

Performance Evaluation ◽

Exposure Assessment ◽

Allergen Exposure ◽

Array Technology ◽

Ring Trial ◽

Multiplex Array ◽

Center Ring

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Numerical Study of Combinations of Strut and Cavity in a Round Supersonic Combustor

International Journal of Turbo and Jet Engines ◽

10.1515/tjj-2016-0069 ◽

2019 ◽

Vol 36 (3) ◽

pp. 219-231

Author(s):

Wenyan Song ◽

Dongqing Zhang ◽

Deyong Shi

Keyword(s):

Fuel Injection ◽

Numerical Study ◽

Velocity Curve ◽

Flow Structures ◽

Streamwise Vortices ◽

Nozzle Outlet ◽

Engine Thrust ◽

Upward Transport ◽

Center Ring

Abstract Different strut-cavity configurations and fuel injection patterns employed in a round supersonic combustor are numerically investigated. A new parameter defined as an ideal nozzle outlet velocity is used to evaluate performances of different strut-cavity configurations and fuel injection patterns. This parameter is a reflection of the contribution of the combustor performance to the engine thrust. The peak of the velocity curve stands for the best performance of the combustor. Then the flowfields are discussed in detail. The flow structures indicate that the injection from the wall behind a strut achieves a great penetration because of the strong upward transport that results from the streamwise vortices behind the strut. Results show that the combustor performance and the flowfields are greatly influenced by the fuel injection patterns. The fuel injections from the strut sides and from the center ring achieve the better performances than that from the wall behind the struts.

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