Materials Literature
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Three criteria are evaluated to assess the potential of a dendrimer based on triazines, 1, for use as a vehicle for drug delivery. These criteria are: (1) its ability to solubilize small hydrophobic guests as measured spectrophotometrically; (2) its ability to deliver a drug in vitro as evaluated using a gene reporter…
Arginase is a binuclear manganese metalloenzyme that catalyzes the hydrolysis of L-arginine to form L-ornithine plus urea. Chiral L-amino acids bearing sulfonamide side chains have been synthesized in which the tetrahedral sulfonamide groups are designed to target bridging coordination interactions with the binuclear…
Abstract A novel low-dimensional molecular conductor, [PXX][FeIII(Pc)(CN)2], has been synthesized. This salt contains the magnetic FeIII ion (S = 1/2), and is isomorphous with [PXX][CoIII(Pc)(CN)2] which includes the non-magnetic CoIII ion. In both salts, the [MIII(Pc)(CN)2] (M = Fe or Co) units form a two-leg ladder…
Inadequate vascular perfusion leads to fatal heart attacks, chronic ulcers, and other serious clinical conditions. The body's capacity to restore vascular perfusion through angiogenesis and arteriogenesis is often impaired by pre-existing disease, and availability of native replacements for nonfunctional arteries is l…
Many MR contrast agents have been developed and proven effective for extracellular nontargeted applications, but exploitation of intracellular MR contrast agents has been elusive due to the permeability barrier of the plasma membrane. Peptide transduction domains can circumvent this permeability barrier and deliver ca…
Abstract The polycondensation of a dihydrazino‐pyrimidine ( 5 and 6 ) with a pyrimidine‐dicarbaldehyde ( 7 and 8b ) provides an efficent access to helical polymeric strands based on the formation of hydrazone connections between the pyrimidine groups. The folding into a helical structure is enforced by the helicity co…
Magnetic-field-induced strain of approximately 10% is reported in Ni 48.8 Mn 29.7 Ga 21.5 alloy at ambient temperature in a magnetic field of the order of 1 T. It was confirmed by different experimental methods that the strain is contributed by twin boundary motion. The crystal structure of thermally-induced martensit…
The synthesis of large dendrons and dendrimers with site-isolated dyes at their core has been explored. The dyes selected for this work were coumarin 343 and pentathiophene, as energy transfer processes prevail when the two dyes are intimately mixed but each should behave independently of the other if site-isolation i…
Two new compounds containing bent-core mesogens are presented in which a flexible central methyleneoxycarbonyl unit acts as the bent fragment. The compounds form different two-dimensional columnar (‘B1’) phases both with a rectangular lattice but different in the angle of the director of the molecules with respect to…
Abstract In this paper, suggestions from molecular dynamics on the plastic deformation mechanism of nanocrystalline (nc) fcc metals are discussed. Investigation of the local average stress in the grain boundaries during deformation highlights the role of the non-equilibrium grain boundary structure in both inter- and…
Abstract Starting from an analysis of filler networking in bulk polymers, a constitutive micro‐mechanical model of stress softening and hysteresis of filler reinforced polymer networks is developed. It refers to a non‐affine tube model of rubber elasticity, including hydrodynamic amplification of the rubber matrix by…
Abstract Crystallization of semi‐crystalline polyolefins (i‐polypropylenes and HD‐polyethylenes) in their blends with amorphous cycloolefin copolymers (COC) were studied. The thermal behaviour of the blends was characterized by Differential Scanning Calorimetry (DSC) whereas blend morphologies were investigated by Sca…
A series of sparger tests have been conducted to investigate the performance of a steam sparger, which will be used in a Korean Advanced Power Reactor, APR1400. The tests have been conducted at the Blowdown and Condensation Loop in the Korea Atomic Energy Research Institute using a prototypic steam sparger. The major…
In this paper, we prove that the total macroscopic deformation energy may be decomposed into two parts, namely, elastic energy due to external stress in the absence of transformation and internal interaction energy induced by transformation. We prove that internal interaction energy is a second order polynomial functi…
Heteroepitaxial multilayers, consisting of graphene/hexagonal boron nitride (h-BN) films on Ni (111), have been investigated by means of vibrational spectroscopy, low energy electron diffraction and Auger electron spectroscopy. Vibrational spectra of the heteroepitaxial film show the appearance of transverse optical (…
A mechanism for void formation is suggested, involving an analysis of the resin flow at macro and micro levels. Both these types of flow arise from the characteristic structure of woven fabrics. In order to investigate the mechanism of void formation in woven fabrics, a new dimensionless number was defined as the rati…
The advantages on VLF (very low frequency) on site testing compared to conventional testing at power frequency are shown in practical and dielectrical aspects. Furthermore VLF test voltages enable the possibility of diagnosis on site. The two well established diagnosis methods, dissipation factor (DF) measurement and…
This work investigates the influence on the partial discharge (PD) onset due to the geometry of solder fillets of aerospace and spacecraft component assemblies operating in vacuum and at high voltages. An automatic measuring system has been developed and calibrated to detect PD signals in vacuum (proportional to the a…
Effects of magnetic field on martensitic transformations have been examined in order to know a magnetic field-induced martensitic transformation by using Fe 3 Pt and Fe-Ni-Co-Ti shape memory alloys and an Fe-Ni alloy polycrystals, and control of variants by magnetic field by using Fe-Pd, Ni 2 MnGa and Fe 3 Pt shape me…
Peculiar diffuse scattering and microstructures, which occur prior to the onset of a B2 → 4H transformation in a Ti 50 Pd 34 Fe 16 alloy, have been intensively studied by energy-filtered electron microscopy and high-resolution electron microscopy. Two types of diffuse scattering, i.e., rod-like diffuse scattering eman…