Porous anodic aluminum oxide: anodization and templated synthesis of functional nanostructures.

19세기말 애국적 담론과 新小說의 정체성

The limitations of applying zero-valent iron technology in contaminants sequestration and the corresponding countermeasures: the development in zero-valent iron technology in the last two decades (1994-2014).

IN view of the interest attaching to the vaporisation and diffusion of solids, the following observations may be worthy of record.

The Diffusion of Solids

This paper discusses the history, current state of the art, and ongoing challenges for compact (less than a few cubic centimeters) magnetic power generation systems in the microwatts to tens of watts power range. These systems are of great interest for powering sensor networks, robotics, wireless communication systems, and other portable electronics. The paper considers the following topics. 1) The theoretical and practical implications of miniaturizing magnetic power generators. 2) The design and performance of previously demonstrated devices, which are summarized and compared. 3) Ongoing challenges for implementation, including integrated high-performance hard magnetic materials, microscale core laminations, low-friction bearings, high-speed rotor dynamics, and compact, high-efficiency power converters.

Review of Microscale Magnetic Power Generation

Proceeding from quantum mechanical predictions, a high shear piezoelectric constant of 178 pm V−1 was measured for the amino acid crystal beta glycine. This originates from the efficient packing of the molecules of the amino acid.

Control of piezoelectricity in amino acids by supramolecular packing.

This paper presents the design and measured results for micro-fabricated inductors suitable for use in high frequency (> 10 MHz), low power (1 -2 W) dc-dc converters. The design has focused on maximizing inductor efficiency for a given converter specification. Inductors in the range of 100 nH to 300 nH have been fabricated and tested. The small signal measurements show a relatively flat inductance profile, with a 10% drop in inductance at 30 MHz. Inductance vs. dc bias current measurements show less than 15% decrease in inductance at 500 mA current. The performance of the micro-inductors have also been compared to a conventional wire-wound inductor in a 20 MHz dc-dc converter. The converter efficiency is shown to be approximately 4% lower when the micro-inductor is used compared to the when the wire- wound inductor is used. The peak efficiency of the micro-inductor in the converter is estimated to be approximately 93%.

https://ulir.ul.ie/bitstream/handle/10344/520/Rhen_microfabricated.pdf

Microfabricated inductors for 20 MHz Dc-Dc converters

Oriented cobalt nanowires prepared by electrodeposition in a porous membrane

Thick films of nearly equiatomic Co–Pt produced by electrodeposition into nanoporous membranes exhibit an isotropic magnetic phase with square hysteresis loops (Mr∕Ms=0.95) and coercivity of up to 1.3 T. The initial magnetization curve is characteristic of pinning-type magnets. The coercivity can be controlled by the choice of annealing temperature or alloy composition, which depends on the chemical composition of the plating bath, properties which can be exploited to produce fine-pitch pole patterns.

/pdf/thick-film-permanent-magnets-by-membrane-electrodeposition-4e7genkwps.pdf

Thick-film permanent magnets by membrane electrodeposition

This paper presents a microinductor fabricated on silicon using electrochemical techniques that has high efficiency in a low power dc-dc converter. Small signal measurements show a flat frequency response up to 20 MHz with a self resonant frequency of 130 MHz. The inductance at low frequency is approximately 440 nH with a dc resistance of 0.5 Omega , and a high quality factor of 11.7 at 5.5 MHz. The current handling capability test shows less than 10% decrease in inductance at 500-mA current. The performance of the microinductor has been compared to a conventional chip inductor in a commercially available 8-MHz buck converter. The converter maximum efficiency when using the microinductor is shown to be approximately 3% lower than the one using the conventional discrete chip inductor. However, the profile of the microinductor is much lower than that of the discrete chip inductor. The maximum efficiency of the microinductor in the converter is estimated to be approximately 92%.

Fernando M.F. Rhen

Papers

Control of piezoelectricity in amino acids by supramolecular packing.

Microfabricated inductors for 20 MHz Dc-Dc converters

Oriented cobalt nanowires prepared by electrodeposition in a porous membrane

Thick-film permanent magnets by membrane electrodeposition

Thin-Film-Integrated Power Inductor on Si and Its Performance in an 8-MHz Buck Converter