Search

It is argued that college students can learn to improve their writing by being taught a number of basic strategies. A distinction is made between weak and strong strategies, and a number of each are identified and discussed. Classroom instructional procedures supporting improvement of skills are outlined. (Author/MSE)

The reduction of lecture time and its replacement with small group sessions in an undergraduate political theory course is described and possible problems associated with this kind of instructional change are discussed. (MSE)

Discusses how the transfer of technology and science from developed to developing countries is affecting the relationship between science and public policy. (HM)

The results of a three-year project introducing small-group experiential learning techniques into a traditionally structured first-year lecture course are presented. Ways to introduce the techniques into large classes with no increase in resources are discussed. (MSE)

Examines the effects of two simulations employed for various teaching purposes in a tertiary education institution. Results indicated that the simulations had little effect on student attitudes and cognitions. (CMV)

Gas phase rovibrational analysis of the high frequency intermolecular hydrogen bonded bending overtone 2ν06 [ν0=1132.4783(2) cm-1] in HCN---HF and its corresponding perdeuterated fundamental ν16 [ν0=409.1660(2) cm-1] are reported. Evaluated rovibrational parameters provide the basis for quantitative modeling of the molecular dynamics associated with this vibration. A quantum mechanical calculation permits determination of the quadratic and quartic force constants K66=537(17) and K6666=4.98(12) cm-1 which in turn are used to estimate the pertinent cubic band stretching interaction constants K466=-149.3(50) cm-1 and account for the unexpected behavior in the rotational constant B16. Second order expansion of the vibrational term energies, give X46=-21.61(2), X67=-7.694(1), X66=-14.84(90), g66=-31.04(90) cm-1, neglecting corrections for Fermi resonance. The common isotopic species equilibrium rotational constant Be is evaluated to be 3681.1(11) MHz. [ABSTRACT FROM AUTHOR]

Gas phase rovibrational analysis of ν1, ν2, and ν3 vibrationally predissociating fundamentals arising from D–F, D–C, and C≡N stretching vibrations of DCN–DF are reported. The rotational substructure in these fundamentals and a total of five associated hot bands have been assigned, thus providing precisely determined band origin frequencies, distortion, and rotational constants. The following molecular parameters were determined for the three fundamentals (in cm-1): ν0(ν1)=2730.8909(2), ν0(ν2)=2638.1309(1), ν0(ν3)=1943.0046(3), B0=0.111 807(1), D0J =0.1946(4)×10-6, α1=0.001 449(2), α2=-0.003 00(1), α3=-0.000 399(1). The l-type doubling constants q‘7 =0.378(3)×10-3 and q7 =0.380(3)×10-3 cm-1 were determined from the observed splitting in ν2+ν17-ν17. Anharmonic cross terms X027 =-0.600(3) and X037 =-0.61(3) cm-1 were also evaluated. Lifetimes of the ν1, ν2, and ν3 excited states were demonstrated to be 5.7(6)×10-10, 5.2(5)×10-9, and 3.0(5)×10-9 s, respectively. [ABSTRACT FROM AUTHOR]

The infrared spectrum of the overtone of the ‘‘intramolecular’’ bending vibration 2ν05 of the hydrogen bonded complex HCN---HF centered at 1437.539 91(24) cm-1 has been obtained with a resolution of 0.006 cm-1. Line assignments for this band as well as two hot bands 2ν05+ν17-ν17 and 2ν05 +2ν27-2ν27 have been made, and rotational constants for all the levels involved have been determined. Despite the fact that the higher J energy levels of the observed lines of 2ν05 are above the dissociation energy of the complex, no predissociative line broadening is apparent. [ABSTRACT FROM AUTHOR]

The infrared spectrum of the intermolecular bending vibration, the ν16 band, of the heterodimer HCN---HF has been obtained with 0.010 cm-1 resolution, and the rotational structure of this band has been assigned. The spectroscopic constants of the ν16 state in cm-1 are: ν0=550.0285(2); B6=0.117 652 9(10); D6J =0.2791(5)×10-6; q6=0.579(8)×10-4; α6=-0.002 137(1), where the uncertainties cited are one standard deviation. [ABSTRACT FROM AUTHOR]

A continuously tunable single frequency color center laser has been used to investigate the rovibrational static gas phase infrared spectra of the ν1 (H–F stretching vibration) and its hot bands ν1+ν17 -ν17 and ν1+ν4-ν4 in the linear dimer HCN---HF. Observed perturbations in the ν1 and ν1+ν17 -ν17 subbands results from Coriolis interactions of the excited vibrational states ν1 and ν1+ν17 with ν2+2ν4+ν17 and ν2+2ν4+2ν07 , respectively. The influence of Coriolis interactions and vibrationally predissociating excited state lifetimes of 1.06(10)×10-10 s are considered in simulation of the observed band profiles. Molecular and anharmonic cross term parameters associated with investigated vibrational states are also presented. Anharmonic crossterms X○14 , X○17 , and X○47 are evaluated as 8.0252(73), 4.2162(53), and 1.000(49) cm-1, from the available data, including the analysis from the unresolved spectra of ν1-ν4 and ν1-ν4+ν17 -ν17 . The differences of the band origins in ν1 and ν1-ν4 give a value of ν4=168.344(21) cm-1 for the local spacing of the low frequency hydrogen-bond stretching vibration. [ABSTRACT FROM AUTHOR]