A detailed understanding of how materials respond to ballistic shock-loading is critical for the design and development of new protective materials. However, the nonlinear viscoelastic deformation present in polymers and nanocomposites during and immediately following a ballistic impact event is not currently well understood. The dynamic mechanical :responses of materials experiencing ballistic...

INTRODUCTION. Parallel magnetic resonance imaging methods can be used to accelerate the spatial-encoding process in MR spectroscopic imaging (MRSI) [1-2]. However, residual aliasing artifacts may be produced due to coil sensitivity variation within the low spatial resolution MRSI voxels [3-4]. This effect leads to increased lipid contamination and it is amplified for array coils with a large nu...

In this Chapter† we review the challenges of, and opportunities for, 3D spectroscopy, and how these have lead to new and different approaches to sampling astronomical information. We describe and categorize existing instruments on 4m and 10m telescopes. Our primary focus is on grating-dispersed spectrographs. We discuss how to optimize dispersive elements, such as VPH gratings, to achieve adequ...

The mass spectra of several pyrazaboles of type 1 where R and'or R' = C2H5 have been studied. The loss of boron-bonded hydrocarbon moieties under electron impact is the predominant feature of all spectra. Some ultraviolet and nuclear magnetic resonance data on compounds of type 1 have been collected; bulky substituents were observed to lead to conformational isomers that can be detected by 13C ...

FTIR spectroscopic studies of the simultaneous condensation of HCl and H2O at 190 K – atmospheric applications I. Xueref 2 and F. Dominé Laboratoire de Glaciologie et de Géophysique de l’Environnement, CNRS, 54 rue Molière, B.P. 96, 38402 Saint Martin d’Hères CEDEX, France Now at: Department of Earth and Planetary Sciences & Division of Engineering and Applied Sciences, Harvard University, 20 O...

In the present study, robust, versatile and straightforward strategy for the diversity-oriented convergent synthesis of a vast range of highly functionalized and biologically effective chromenes is introduced with the reaction of malononitrile, dimedone/cyclohexadione/4-hydroxycoumarin and benzaldehydes in the presence of [γ-Fe2O3@HAp-Si(CH2)3BF4@DMIM] as the catalyst. The structures of all the...

Studying the energy level structure of di€erent molecules by means of spectroscopy is one of the ®elds in physics and chemistry. In this paper, we describe a knowledge-based system, molecular spectroscopic assignment assistant (MOSAA), which can assist researchers in the assignment of the far-infrared and infrared absorption peaks of the molecules in question by using the spectral information p...

We present spectroscopic diffraction phase microscopy (sDPM) as a method capable of measuring quantitative phase images at multiple wavelengths. sDPM uses a spatial light modulator at the Fourier plane of a lens to select desired wavelengths from the white light illumination of a grating. The quantitative phase information at different wavelengths allows us to decouple the refractive index and ...

The spectral properties of elastic light-scattering signals have been shown to provide a wealth of information on nanostructures and microstructures. We present elastic backscattering spectroscopic microscopy that allows simultaneous acquisition of microscopic images and backscattering spectra at each pixel. Within a single homogeneous micrometer-scale particle we observe two distinct and highl...

a novel c-homoprotoberberine alkaloid, hediamine (2), has been isolated from the roots of berberis actinucantha (berberidaceae). conclusive proof for the structure of hediamine was obtained by its comparison with the isomeric lactam (4), by chemical transformation, and by means of spectroscopic techniques (uv, ir, ms, nmr).