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Margaret Hayman 《International Journal of Mathematical Education in Science & Technology》2013,44(2):147-155
A questionnaire survey was used to gauge the opinions of mathematics teachers about some history of mathematics material recently developed for use in the classroom. Teachers' opinions of the materials were generally favourable, but a sizeable proportion responded that they would not be prepared to actually use such material in their own teaching. 相似文献
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Philip W. Kletnieks Ann J. Liang Raluca Craciun Justin O. Ehresmann Dr. David M. Marcus Dr. Vinesh A. Bhirud Dr. Meghan M. Klaric Miranda J. Hayman Darryl R. Guenther Olesya P. Bagatchenko David A. Dixon Prof. Bruce C. Gates Prof. James F. Haw Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2007,13(26):7267-7267
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Buchi N. Nalluri K.P.R. Chowdary K.V.R. Murthy V. Satyanarayana A.R. Hayman G. Becket 《Journal of inclusion phenomena and macrocyclic chemistry》2005,53(1-2):103-110
The purpose of the work is physicochemical characterization of nimesulide (NI) and meloxicam (ME)–hydroxypropyl-β-cyclodextrin
(HP-β-CD) binary systems both in solution and solid states and to improve the pharmaceutical properties of NI and ME via inclusion
complexation with HP-β-CD. Binary systems of NI and ME with HP-β-CD have been characterized both in solution and solid state
by different physicochemical methods. Three types of drug–HP-β-CD binary systems, namely physical mixtures (PM), kneaded systems
(KS) and co evaporated systems (CS) in 1:1 and 1:2 molar ratios (1:1 and 1:2 M) were prepared. Phase solubility and 1H-NMR spectroscopic studies in solution state revealed 1:1 M complexation of NI and ME with HP-β-CD. A partial inclusion of
NI with HP-β-CD at both molar ratios of kneaded and co evaporated systems and a true inclusion of ME with HP-β-CD at both
molar ratios of co evaporated systems in solid state was confirmed by differential scanning calorimetry (DSC), powder X-ray
diffractometry (powder X-RD) and scanning electron microscopy (SEM) studies. Dissolution properties of NI and ME–HP-β-CD binary
systems were superior when compared to corresponding pure drugs. The aqueous solubility and dissolution properties of NI and
ME can be improved by inclusion complexation with HP-β-CD.
Author for correspondence: E-mail: nbnaid2@E-mail.uky.edu 相似文献
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We investigate nonlinear oscillations in a fourth-order partialdifferential equation which models a suspension bridge. Previouswork establishes multiple periodic solutions when a parameterexceeds a certain eigenvalue. In this paper, we use Leray-Schauderdegree theory to prove that if the parameter is increased further,beyond a second eigenvalue, then additional solutions are created. 相似文献
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Information on the volume (V) dependence of an electron-ion coupling strength (K?) can be obtained from high temperature resistivity. In LidlnK?/dlnV is negative while in the other alkalis it is initially positive although under very large volume changes K? becomes minimum and then starts to increase. We present a simple explanation of this behaviour which depends only on the properties of the alkali pseudopotentials. A spherical Fermi surface is assumed and there is no need to introduce complicated Fermi changes with pressure as have been suggested in the past. 相似文献
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