Materials Literature
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In a recent paper, cond-mat/0404041, J. Vanacken et al. reported experimental studies of crystals of Mn12-ac molecular nanomagnets in pulsed magnetic fields with sweep rates up to 4000 T/s. Steps in the magnetization curve were observed. The data were explained by collective dipolar relaxation. We give here an alterna…
Strong tube−tube van der Waal attractions that hinder the dissolution of single walled carbon nanotubes (SWNTs) as individuals have been overcome by the direct protonation of the tubes by superacids. The pristine nanotubes disperse as individuals in 100% H 2 SO 4, oleum, trifluromethanesulfonic acid, and chlorosulfoni…
Using a thin film of metallic tin as catalyst, ultrasmall single-crystalline zinc oxide nanobelts have been synthesized in large quantity using a simple solid−vapor technique. The nanobelts have an average width of 5.5 nm and a narrow size distribution of ±1.5 nm. The nanobelts grew along the [0001] direction, with (2…
We investigated physicochemical properties of two types of poly(N-isopropylacrylamide) (PIPAAm)-grafted tissue culture polystyrene (TCPS) surfaces, to elucidate the influential factors for thermally regulated cell adhesion and detachment to PIPAAm-grafted surfaces. The two types of PIPAAm-grafted surfaces were prepare…
Using the silicon bulk micromachining and selectively oxidized porous silicon (SOPS) technology, a silicon dioxide microlens was implemented on thick oxidized porous silicon (OPS) membrane. Because the surface of microlens was the interface of OPS-Si, the surface roughness of lens was directly affected by the anodizat…
Electric field induced second harmonic generation (EFISHG) is a standard technique for the experimental determination of molecular hyperpolarizability. We have developed a novel cell design for EFISHG experiments that makes use of a conventional spectrometer glass cuvette. An efficient and convenient protocol is devel…
Abstract: Ecdysteroid is one of the two most important insect hormones, which controls growth and developmental activities of insect. In silkworm, Bombyx mori L., basically ecdysteroid induces molting and metamorphosis in larvae and exogenous administration hastens the silk synthetic activity and cocoon spinning proce…
The segmental and local dynamics of semicrystalline, melt-miscible blends of poly(ethylene oxide) [PEO] and a poly(styrene- co - p -hydroxystyrene) copolymer [SHS] were investigated using dielectric relaxation spectroscopy (DRS). A broad, yet well-defined, DRS segmental process is observed for the 5 wt % SHS blend, an…
The pga gene of Escherichia coli W ATCC11105 encodes a penicillin G acylase whose expression is regulated at both the transcriptional and post-transcriptional level. In this work we have shown that PaaX is the repressor of pga expression, and we have identified its binding consensus as TGATTC(N27)GAATCA. We conclude t…
Abstract Dynamic mechanical results are reported for segmental relaxation of monodisperse polystyrenes (PSs) with molecular weights of 0.7, 3, 18, and 104 kg/mol and bidisperse PSs created from blending pairs of these materials. The data for the monodisperse polymers confirm previous findings; namely, there is an incr…
A new system aimed at performing partial discharge measurements and condition assessment on electrical apparatus is presented. It is able to separate the conventional phase resolved partial discharge pattern into a series of sub-patterns, each of them containing partial discharge data generated by a single kind of def…
The intensity dependence of optical nonlinearity in a nematic liquid crystal doped with an azo-dye is investigated. The reorientational part of the nonlinearity changes from self-defocusing to self-focusing character while the intensity passes through the saturation value of trans-cis photoisomerization. This observat…
Investigation of the structural and vibrational properties of the ${\mathrm{Pb}}_{x}{\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{TiO}}_{3}$ (PCT) system exhibits two phase transitions in the range of $x=0--1$ by using x-ray powder diffraction and Raman spectroscopy. The first transition occurring at $x\ensuremath{\sim}0.6…
Abstract The aggregation behavior, binding to DNA and photophysical properties of meso ‐tetratolylporphyrins substituted with two ( P 2 ), three ( P 3 ) and four ( P 4 ) pyridinium groups were studied using UV–visible and transient spectroscopy, resonance light scattering, circular dichroism and time‐resolved luminesc…
In this paper, the mechanism of plasma-charging damage (PCD) of metal-insulator-metal (MIM) capacitors as well as possible protection schemes are discussed. A range of test structures with different antennas simulating interconnect layout variations have been used to investigate the mechanism of PCD of MIM capacitors.…
Vancomycin, the last line of defense antibiotic, depends upon the attachment of the carbohydrate vancosamine to an aglycone skeleton for antibacterial activity. Vancomycin is a naturally occurring secondary metabolite that can be produced by bacterial fermentation. To combat emerging resistance, it has been proposed t…
The ${\mathrm{LaMn}}_{1\ensuremath{-}x}{\mathrm{Ga}}_{x}{\mathrm{O}}_{3}$ series has been studied by means of x-ray absorption spectroscopy at both Mn and Ga $K$ edges. A homovalent substitution between ${\mathrm{Mn}}^{3+}$ and ${\mathrm{Ga}}^{3+}$ can be deduced from the x-ray absorption near-edge structure (XANES) s…
Abstract Aiming to develop a high‐performance fiber‐reinforced rubber from styrene–butadiene rubber (SBR), we applied a special technique using electron‐beam (EB)‐irradiation‐induced graft polymerization to ultrahigh‐molecular‐weight‐polyethylene (UHMWPE) fibers. The molecular interaction between the grafted UHMWPE fi…
In this work, a novel route to synthesize polymer/metal composite nanospheres has been proposed. This method combines the advantages that the polymer chains collapse and entangle in the presence of compressed CO(2), which acts as antisolvent, and the metal nanoparticles and polymers can be precipitated simultaneously…
A practical design method, which is based on the current shape, is presented to achieve the appropriate parameters of the flyback transformer. Through this method, a practical transformer is achieved, and its performance is verified by a step-up flyback converter, experimental waveforms and result are presented.