Some remarks on the charge form factor of He and the center-of-mass motion spuriousity

It is shown that the various single-particle wave functions used to reproduce the charge form factor of ⁴He nucleus contain a large amount of center-of-mass motion spuriousity, so that the good fit to the experimental data obtained with these wave functions is only due to the way the center-of-mass motion coordinate was removed rather than to the characteristics of the model.     

Method for accurate measurement of complex permittivity of tissueequivalent liquids

A microwave method for determining the electrical properties of lossy liquids is presented. The method is optimised for measuring the complex permittivity of human tissue equivalent liquids typically used together with human head phantoms in SAR (specific absorption rate) measurements. The method presented has a considerably better performance than conventional methods     

Lowest-order and hyper-netted-chain calculations of nuclear matter

Employing two model central interactions the binding energy of nuclear matter is calculated within the framework of the Jastrow variational approach using different types of constrains and including all the contributions from hypernetted-chain diagrams.     

New method for measuring properties of nonhomogeneous materials bya two-polarization forward-scattering measurement

A novel method for measuring properties of grainy materials using a two-polarization scattering measurement combined with free-space phase measurement is introduced. The theoretical background of the measurement method is presented. Laboratory measurements of the depolarized scattering cross sections of white rice, green lentils, polystyrene beads, polyethylene beads, and their mixtures at 10 and 35 GHz using a vector network analyzer and two horn antennas are then presented. Results are compared with those based on the first-order multiple scattering theory. A low-cost set-up for industrial measurements is suggested     

Subsidiary conditions and variational calculations of nuclear and neutron matters

The energy of nuclear and neutron matter is calculated within the framework of the variational approach including the contribution from three-body clusters. Two types of constrains for the two-body correlation function and realistic S-wave forces are used. It is shown that the energy strongly depends upon the type of constraint and that the variational calculation may lead to much more energy than the lowest order Brueckner theory calculations.     

Liquid chromatographic-electrospray ionization mass spectrometric analysis of neutral and charged polyethylene glycols

Poly(ethylene glycols) (PEGs) are widely used water soluble and biocompatible polymers. PEGs are suitable as paracellular probes in biomembrane permeability studies because they are hydrophilic and various oligomers have defined molecular sizes. In previous studies corneal and conjunctival permeability for neutral PEGs has been measured, and the results were used to calculate the number and size of the cellular pores. In this study we have developed a high-performance liquid chromatographic-electrospray ionization-mass spectrometric method for analysis of neutral PEGs and positively changed amino PEGs simultaneously. The new method is fast, accurate, sensitive and specific for high throughput analysis. The method was used to evaluate the paracellular permeability of PEGs through a corneal epithelial cell culture. Paracellular pores are negatively charged and it was in our interest to characterize the interactions of positive charge and size of the molecules with the paracellular pores.     

The effect of the Δ(1236) on the trinucleon charge form factor

The Δ(1236) is introduced into the wavefunctions of³He and³H and the charge form factor calculated. The effect is to slightly aggravate the already large discrepancy between theory and experiment for q² ? 14 fm^?2. However, there are two side benefits —a simple way to understand the d-wave contribution to the CFF, and a simple NΔ correlation function having a very good overlap with a more exact correlation.     

Electromagnetic humidity sensor for industrial applications

The letter describes an electromagnetic humidity sensor based on a resonance perturbation technique. The proposed sensor is capable of measuring humidity over a wide dynamic range in an industrial environment and is insensitive to dust, dirt, oil vapours etc. The all-metal construction of the sensor makes it immune to damage by high temperature. The sensor signal processing circuit provides a time-dependent signal which can be directly applied to any modern computerised control systems.