Materials Literature
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The demagnetization behavior of commercial sintered Nd-Fe-B magnets was investigated for field directions inclined by 0/spl deg/, 45/spl deg/, and 90/spl deg/ with respect to the easy axis. For demagnetizing field strengths well below the coercivity, the reversible permeability parallel to the easy axis amounts to 1.0…
Eddy current loss in Nd-Fe-B sintered magnets was investigated from experimental and simulated aspects. Eddy current loss was estimated from the temperature rise rate of a thermally insulated magnet when an ac field is applied to the solenoid coil. Eddy current simulation is done by the integral element method (IEM) a…
The tris(para-pyridyl)phosphine template (1) has been used in conjunction with a series of meso-substituted Zn(II)-tetraphenylporphyrins complexes (2-10) to create supramolecular encapsulated ligand assemblies via Zn-N(pyr) interactions. The structural features of supramolecular ligand 1.[2](3) have been investigated…
We report dramatic improvements in both magnetostriction level and strain derivative of polycrystalline cobalt ferrite as a result of magnetic annealing. Magnetostrictive cobalt ferrite composites have potential for use in advanced magnetomechanical stress and torque sensors due to their high sensitivity of magnetizat…
When assessing historic textiles and considering appropriate conservation, display, and storage strategies, characterizing the physical condition of the textiles is essential. Our work has concentrated on developing nondestructive or micro-destructive methodologies that will permit this. Previously, we have demonstrat…
We report here the first crystal structure of the N-terminal domain of an A-type Lon protease. Lon proteases are ubiquitous, multidomain, ATP-dependent enzymes with both highly specific and non-specific protein binding, unfolding, and degrading activities. We expressed and purified a stable, monomeric 119-amino acid N…
We report the fabrication and characterization of light-emitting transistors incorporating individual cadmium selenide (CdSe) nanocrystals. Electrical measurements conducted at low bias voltage and low temperature show clear evidence of Coulomb blockade behavior, indicating that electrons pass through the nanocrystal…
A simple, yet very flexible robotic dipping system for the preparation of functional thin films is presented. These films are deposited onto a substrate using the layer-by-layer assembly technique. The robot alternately dips a substrate into aqueous mixtures containing oppositely charged or otherwise complementary spe…
[reaction: see text] An organogel bearing reactive groups has been used as a platform for the gel-phase synthesis of more sophisticated materials. The results show that reactions take place on the gel fibers and that supramolecular aggregation modifies the product distribution in cases where several compounds can be o…
This paper evaluated the internal stresses of different diamond and diamondlike carbon (DLC) coatings. For the diamond coatings, the stresses were determined using micro-Raman spectroscopy and x-ray diffraction (XRD), while the stresses of DLC films were determined with bent plate method. The internal stress was relat…
Infrared spectroscopy has been used to study the evolution of polyurethane foam structure, providing measures of relative reaction kinetics, hard segment growth, the onset of phase separation, the formation of order, and the development of final morphology. Changes in free, monodentate, and bidentate hydrogen-bonded u…
We have developed a new powder magnetic core, named the high-density magnetic composite (HDMC), with high density, high magnetic flux density, and high strength. However, the HDMC, which was fabricated from iron powder coated with a phosphate amorphous insulator, has large eddy-current loss under high frequency becaus…
Successful homing of drugs to the desired biological compartment of the host usually depends on the intrinsic properties of the drug molecules. However, it can always be manipulated by appropriate designing of the carrier/delivery system, as little can be done to influence the target and its surroundings. Various carr…
We describe a method to measure the free-energy difference, DeltaG, between crystal polymorphs from their calorimetric data of eutectic melting with a common additive. The use of different additives yields DeltaG as a function of temperature. The method is suitable for crystals that chemically decompose or physically…
We have investigated charge carrier transport in the various phases of the metal-free phthalocyanine derivative, 1,4,8,11,15,18,22,25-octaoctylphthalocyanine (8H 2 Pc), by the time-of-flight method. The discotic columnar phase of 8H 2 Pc easily self-organizes in columns perpendicular to the substrate when cooled from…
The magnetic and magnetocaloric properties of Mn/sub 1.1/Fe/sub 0.9/p/sub 1-x/Ge/sub x/ compounds with x=0.20,0.22,0.23,0.26, and 0.30 have been investigated. In the composition range x from 0.20 to 0.30, the compounds crystallize in the Fe/sub 2/P-type hexagonal structure. The Curie temperature of the compounds stron…
It is impractical to achieve the desired combination of power and bandwidth from conventional electromechanical acoustic sources. However, these characteristics can be achieved by the use of pulsed power technology to generate high-power ultrasound (HPU). High-voltage pulses induce the electrical breakdown of water an…
Degradation of dimethyl isophthalate (DMI) and dimethyl phthalate ester (DMPE) was investigated using microorganisms isolated from mangrove sediment of Hong Kong Mai Po Nature Reserve. One enrichment culture was capable of utilizing DMI as the sole source of carbon and energy, but none of the bacteria in the enrichmen…
The switching behavior of 1,2-bis(5-phenyl-2-methylthien-3-yl)perfluorocyclopentene and its nonfluorinated (perhydro) analogue are compared. For both molecules, the dynamics after optical excitation can be separated into three regimes: preswiching due to excited state mixing; the ring closure itself; postswitching rel…
In this paper, the most important results are presented and discussed from a multiyear interdisciplinary study directed toward the identification of the most suitable glass/polymer composite systems with the highest resistance to brittle fracture for high voltage composite insulator applications. Several unidirectiona…