GaSb laser-power (λ = 1550 nm) converters: Fabrication method and characteristics

Photovoltaic converters of laser light with a wavelength of λ = 1550 nm are developed using liquidphase epitaxy (LPE), metal-organic chemical-vapor deposition (MOCVD), and diffusion from the gas phase into the n-GaSb substrate. Photocells with an area of S of 4, 12.2, and 100 mm² are fabricated and tested. The characteristics of the samples produced by different methods are compared. The monochromatic efficiency is found to be 38.7% for the best converters (with S = 12.2 mm²) at a laser power of 1.4 W.     

Scheduling algorithms in broadband wireless networks

Scheduling algorithms that support quality of service (QoS) differentiation and guarantees for wireless data networks are crucial to the development of broadband wireless networks. Wireless communication poses special problems that do not exist in wireline networks, such as time-varying channel capacity and location-dependent errors. Although many mature scheduling algorithms are available for wireline networks, they are not directly applicable in wireless networks because of these special problems. This paper provides a comprehensive and in-depth survey on recent research in wireless scheduling. The problems and difficulties in wireless scheduling are discussed. Various representative algorithms are examined. Their themes of thoughts and pros and cons are compared and analyzed. At the end of the paper, some open questions and future research directions are addressed     

Novel design concept of waveguide mode adapter for low-loss modeconversion

We proposed a novel design concept of a mode adapter using a new parameter. The overlap integration of two adjacent mode profiles is defined as a single step loss (SSL) parameter for the characterization of optical mode confinement as well as the quantification of mode mismatch. The variation of SSL is described with two parameters. These parameters are V, a normalized frequency, and s, a differential width variation ratio. The contour for constant SSL in the V, s plane provides the optimized s curve as a function of V. The design concept with this constant SSL is shown to provide optimized adapters of minimized conversion loss     

Building Systems for Object Recognition by Multichannel Sensing Systems Based on Neural Networks and Fractal Signatures

Journal of Communications Technology and Electronics - An approach to building a multichannel pattern-recognition system by sensing systems is proposed. A list of problems solved by the sensing...     

The effect of erbium and oxygen on the photoluminescence intensity of erbium and the composition of <Emphasis Type="Italic">a</Emphasis>-SiO<Subscript>x</Subscript>:(H,Er, O) films deposited by DC magnetron sputtering

The effect of the oxygen content (\(C_{O_2 } \)) in the gas mixture (20% of SiH₄ + 80% of Ar) + O₂ and the surface area of an erbium target (S_Er) on the composition and Er³⁺ photoluminescence of amorphous a-SiO_x:(H, Er, O) films prepared by dc magnetron sputtering has been investigated. Analysis of the experimental data shows that [Er-O] and [Er-O-Si-O] clusters are formed in the gas plasma due to the competing processes of oxidation and sputtering of Si and Er targets and to the interaction of [Si-O] and [Er-O] clusters with each other and with the oxygen in the gas phase. The discontinuities in the dependences of the contents of erbium-bound oxygen and erbium in a film, and N _O ^Er-O and N_Er = f(\(C_{O_2 } \), S_Er), at \(C_{O_2 } \) ≈ (5–6.5) mol % supports the hypothesis on the existence of different erbium clusters. The necessary conditions for preparing a-SiO_x:(H, Er, O) films with the highest photoluminescence intensity of erbium ions at a wavelength of 1.54 μm are determined.     

Cookability of African yambean,Sphenostylis stenocrarpa (Hochst ex. A. Rich) Harma

Dry yambean seeds, prior to soaking and during storage treatments, were moist cooked and autoclaved. Seeds, presoaked in water, sodium chloride (brine), as filterate (alkali) and a mixture of brine and alkali (alkalibrine) were also similarly cooked. Water and alkali-soaked seeds became hydrated faster than those pre-soaked in brine and alkali-brine solution. When cooked under constant temperature conditions the untreated yambean took about 190 min to cook on a hot plate and kerosene stove and 65 min by autoclaving. Soaking treatments substantially rendered dry yambean more quick-cooking, especially when pre-contacted in brine or alkali-brine for which cooking time was about a third of that of un-soaked seeds. Yambean cook-ability declined by 9% after 3 months in storage under room temperature (29 °C).     

Chemical and biological evaluation of silk worm chrysalid protein

Dried and defatted, water extracted and hydrogen peroxide treated silk worm chrysalides (SWC) were analysed for gross composition as well as for energy, fatty acids and amino acids. The amino acid analyses showed well-balanced amino acid patterns. Water extraction and hydrogen peroxide treatment improved odour, taste and colour of the product. Tests with rats showed that raw and water extracted SWC were well utilised whereas hydrogen peroxide treated SWC showed reduced protein utilisation. It is concluded that the water extracted SWC is better suited for eventual use as a food component than the hydrogen peroxide treated SWC.     

Effect of Electrical Stimulation on Postmortem Property Change of Myofibrillar Proteins

Changes in biochemical properties of myofibrillar proteins of rabbit muscle, which had been subjected to electrical stimulation soon after slaughter, during postmortem storage at 0°C were investigated. Myofibrillar ATPase activity and the ATPase activity of acto-heavy meromyosin (HMM) complex, reconstituted from actin and HMM which had been prepared from at-death and postmortem muscles, decreased at first and then increased slightly during 7 days storage. In addition, the change of the dissociation constant of acto-HMM complex of electrically stimulated muscle during postmortem storage was quite small, i.e., 1.59 ± 10^?4M for at-death muscle, 1.70 ± 10^?4M for muscle stored for 1 day and 1.49 ± 10^?4M for muscle stored for 7 days. This indicates that electrical stimulation treatment minimized the postmortem change of actin-myosin interaction.     

Effect of frozen storage on the structure and enzymatic activities of myofibrillar proteins of rabbit skeletal muscle

The effect of frozen storage on the biochemical properties of myofibrils, and of their major constituents, actin and myosin, was investigated. Extractability of myofibrillar proteins increased slightly for 3 weeks during frozen storage of muscle, decreasing thereafter. The change in myofibrillar ATPase activity during frozen storage was consistent with that of a reconstituted acto-heavy meromyosin (HMM) complex prepared from frozen stored muscle at the same weight ratio of actin to myosin as in situ. However, myosin ATPase activity showed a different pattern of change when compared with myofibrillar ATPase activity. The maximum velocity of acto-HMM ATPase activity and the apparent dissociation constant of the acto-HMM complex decreased for 1 week during frozen storage, increasing thereafter, indicating that the affinity of actin for myosin was greatest in muscle which had been frozen for 1 week.