The water sorption behavior of a two-phase system of calcium chloride/silica gel composite based on mesoporous and microporous silica gels as host matrices and calcium chloride as a hygroscopic salt was studied. The dielectric properties at microwave frequencies of the composites with different adsorbed water contents were also tested. It is found that the composite exhibits excellent water sor...

We report an ab initio molecular dynamics study of the hydration process in a model IRMOF material. At low water content (one molecule per unit cell), water physisorption is observed on the zinc cation but the free⇄bound equilibrium strongly favors the free state. This is consistent with the hydrophobic nature of the host matrix and its type-V isotherm observed in a classical Monte Carlo simula...

Introduction: Age-related increase in cortical bone porosity is a major cause of the impaired strength of osteoporotic cortical bone. The majority of these pores, however, are below the resolution limit achievable in vivo. Water H NMR signal in bone at 3T results from two compartments: long T2 (T2 ≥ 1 ms), corresponding to free water in pores (‘pore water’); and short T2 (T2 ~ 300-400 μs), corr...

The dielectric properties of water-treed crosslinked polyethylene (XLPE) were studied by using a hollow microwave waveguide system between 135 MHz and 13.6 GH5. The dielectric loss of water-treed XLPE is proportional to water content. Water-treed XLPE has a low relaxation frequency which is probably due to bound water. The binding of water in trees was confirmed by the lower apparent water diff...

The bound state of water in PEG (polyethylene glycol)-H(2)O systems was studied by using HFS and DSC methods. Samples with the mixing ratios EO:H(2)O = 1:1 (a) and 1:10 (b), where EO indicates the ethylene oxide units in PEG chain, were heated from frozen state to melt state. Sample (a) gave an HFS peak corresponding to the weakly bound water, while sample (b) gave the peaks of both the bound a...

cellular manufacturing system (cms) is highly important in modern manufacturing methods. given the ever increasing market competition in terms of time and cost of manufacturing, we need models to decrease the cost and time of manufacturing. in this study, cms is considered in condition of dynamic demand in each period. the model is developed for facing dynamic demand that increases the cost of ...