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Influence of absorbed water on the dielectric properties and glass-transition temperature of silica-filled epoxy nanocomposites
Work on dielectric spectroscopy of epoxy resin filled with nano-SiO2 at different relative humidities and temperatures is reported. Above the glass-transition temperature (Tg), dc-like imperfect charge transport (QDC or LFD) dominates the low frequency dielectric spectrum. Another mid-frequency relaxation process was found in the non-dried composites. Water also induces glass-transition temperature decreases, which can be measured both by dielectric spectroscopy and DSC. Both theory and experiment demonstrated that a higher water content could exist in nanocomposites than unfilled epoxy suggesting a bigger free volume when nanostructured. In our system, the hydrophilic surface of silica is likely to cause water to surround and lead to delamination of the epoxy from SiO2. This is a potential mechanical and dielectric weakness in the nanocomposites, which may lead to an ageing phenomenon. Hydrophobic surface group may reduce the water adsorption in nanocomposites
Dynamic characteristics and processing of fillers in polyurethane elastomers for vibration damping applications
Polyurethane elastomers have the potential of being used to reduce vibrational noise in many engineering applications. The performance of the elastomer is directly related to matching the nature of the mechanical loss characteristics to the frequency and temperature dependence of the source of the vibration. Materials with a broad frequency response and good mechanical properties are desirable for situations were load bearing and isolation becomes an issue. Because automobile, and other related vehicles operate over a broad temperature range, it is desirable for the damping characteristics of the elastomer to ideally be independent of temperature and frequency. In practice, this is not possible and the creation of materials with a broad spectrum response is desirable. In this paper, the effects of various fillers on the breadth and temperature dependence of the vibration damping characteristics of a filled and crosslinked polyurethane elastomer are explored. The fillers studied are wollastonite, barium sulphate and talc. These materials have different shapes, sizes and surface chemistry and undergo different types of interaction with the matrix. The vibration damping characteristics were further varied by the use of a crosslinking agent. Data presented on the rheological characteristics indicate the strength of the filler-polyol interactions. Dielectric relaxation and dynamic mechanical thermal analysis demonstrate the way in which changes in the type of filler, concentration and amount of crosslinker lead to changes in the location and breadth of the energy dissipation process in these elastomers. The vibration damping characteristics of a selected material are presented to demonstrate the potential of these materials
Search for Spin-Dependent Short-Range Force Using Optically Polarized He Gas
We propose a new method to detect short-range \textit{P-} and \textit{T-}
violating interactions between nucleons, based on measuring the precession
frequency shift of polarized He nuclei in the presence of an unpolarized
mass. To maximize the sensitivity, a high-pressure He cell with thin glass
windows (250 ) is used to minimize the distance between the mass and
He. The magnetic field fluctuation is suppressed by using the He gas in
a different region of the cell as a magnetometer. Systematic uncertainties from
the magnetic properties of the mass are suppressed by flipping both the
magnetic field and spin directions. Without any magnetic shielding, our result
has already reached the sensitivity of the current best limit. With improvement
in uniformity and stability of the field, we can further improve the
sensitivity by two orders of magnitude over the force range from
m
Multiatom and resonant interaction scheme for quantum state transfer and logical gates between two remote cavities via an optical fiber
A system consisting of two single-mode cavities spatially separated and
connected by an optical fiber and multiple two-level atoms trapped in the
cavities is considered. If the atoms resonantly and collectively interact with
the local cavity fields but there is no direct interaction between the atoms,
we show that an ideal quantum state transfer and highly reliable quantum swap,
entangling, and controlled-Z gates can be deterministically realized between
the distant cavities. We find that the operation of state transfer and swap,
entangling, and controlled-Z gates can be greatly speeded up as number of the
atoms in the cavities increases. We also notice that the effects of spontaneous
emission of atoms and photon leakage out of cavity on the quantum processes can
also be greatly diminished in the multiatom case.Comment: 24 pages, 8 figures; Corrected typos in fig6(b),(c) and references;
Adding disscussion on experimental feasibility in the last section. Accepted
for PR
A 20-year reanalysis experiment in the Baltic Sea using three-dimensional variational (3DVAR) method
A 20-year retrospective reanalysis of the ocean state in the Baltic Sea is constructed by assimilating available historical temperature and salinity profiles into an operational numerical model with three-dimensional variational (3DVAR) method. To determine the accuracy of the reanalysis, the authors present a series of comparisons to independent observations on a monthly mean basis. <br><br> In the reanalysis, temperature (T) and salinity (S) fit better with independent measurements than the free run at different depths. Overall, the mean biases of temperature and salinity for the 20 year period are reduced by 0.32 °C and 0.34 psu, respectively. Similarly, the mean root mean square error (RMSE) is decreased by 0.35 °C for temperature and 0.3 psu for salinity compared to the free run. The modeled sea surface temperature, which is mainly controlled by the weather forcing, shows the least improvements due to sparse in situ observations. Deep layers, on the other hand, witness significant and stable model error improvements. In particular, the salinity related to saline water intrusions into the Baltic Proper is largely improved in the reanalysis. The major inflow events such as in 1993 and 2003 are captured more accurately as the model salinity in the bottom layer is increased by 2–3 psu. Compared to independent sea level at 14 tide gauge stations, the correlation between model and observation is increased by 2%–5%, while the RMSE is generally reduced by 10 cm. It is found that the reduction of RMSE comes mainly from the reduction of mean bias. In addition, the changes in density induced by the assimilation of T/S contribute little to the barotropic transport in the shallow Danish Transition zone. <br><br> The mixed layer depth exhibits strong seasonal variations in the Baltic Sea. The basin-averaged value is about 10 m in summer and 30 m in winter. By comparison, the assimilation induces a change of 20 m to the mixed layer depth in deep waters and wintertime, whereas small changes of about 2 m occur in summer and shallow waters. It is related to the strong heating in summer and the dominant role of the surface forcing in shallow water, which largely offset the effect of the assimilation
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