Efficient coupling into and out of high-Q resonators

The temporal-coupled-mode theory is directly applied to the design of devices that feature a resonator with a high quality factor. For the temporal-coupled-mode theory we calculate the decay rate of the resonator to determine the transmission properties of the device. The analysis using the decay rates requires little computational effort, and therefore the optimum device properties can be determined quickly. Two examples, a wavelength filter and a resonator crossing, are presented to illustrate the use of the analysis.     

Integrated psychological services in the Greeley-Evans public schools.

Integrated school psychological services were implemented 12 years ago in the Greeley-Evans Public Schools by combining the positions of school psychologist and school social worker and placing each professional in an elementary school full-time. After 5 years, services were expanded to secondary schools such that all schools had a full-time school psychologist. Using Bennett's (1988) model for the evaluation of alternative services to determine success in meeting stated goals, a number of positive outcomes were achieved. A time-use survey indicated increased involvement with a variety of interventions for school psychologists. The results of a consumer satisfaction questionnaire given to teachers, administrators, and support personnel also suggested positive perceptions of the new role. Additionally, placement of students with significant emotional disturbance decreased over this time period relative to a 34% student enrollment increase. It is hoped that the long-term implementation of an alternative school psychological services model such as this one will encourage others to enact ecologically responsive services relative to their unique systems. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

手机功率放大器的未来发展和技术选择从功率放大器到集成RF前端模块

手机功率放大器(PA)通常有3种实现方式:分立晶体管电路、单片微波集成电路(MMIC)和功率放大器模块(PAM)。分立电路是最古老也最便宜的解决方案,仍在广泛应用,如AMPS功放中。由于成本的原因,选用的是硅双极器件。分立方案的一个主要缺点是手机制造商必须自己完成功率放大器的设计。由于分立元件解决方案占用的面积较大,相应的RF设计受到众多寄生元件的影响,并且通常比较笨重,特别是当峰值功率上升,同时供电电压下降,频率升高时问题更突出。这一方案要求手机制造商拥有丰富的射频电路设计经验,并     

A new hybrid MCDM approach for RPN evaluation for a medical device prototype

The Failure Mode and Effect Analysis (FMEA) is a useful instrument born in the aerospace industry and widely used to improve a process or product's efficiency. Over the years, this instrument has been adopted in increasingly different contexts, such as HealthCare. This paper proposes an approach aimed at improving the defects typical of the classic FMEA in the design phase, that is, in a scenario full of uncertainties and with little information available, using a new hybrid Multiple-criteria decision-making (MCDM) method in order to obtain a priority index more performant than Risk Priority Number (RPN). In the proposed method, the three assessment criteria have a different weighting in the index's final computation, differently from the classical RPN. These weights are obtained with a scientific technique, thus avoiding that excessive subjectivity influences the final result. A more efficient priority index is obtained through a new hybrid approach that solves some classical RPN gaps. A case study concerning an endoscope Ear Nose Throat Entropy (ENT) prototype is examined to illustrate the proposed method. FMEA analysis in HealthCare is increasingly used for its flexibility and reliability. This study focuses on using new techniques to eliminate certain defects or exploit some qualities better. The use of a robust and elastic innovative MCDM method to calculate a new priority index and a scientific technique to obtain the weight of the selection are the interesting insights proposed in this paper.     

Controlling the Chromaticity of Small‐Molecule Light‐Emitting Electrochemical Cells Based on TIPS‐Pentacene

This work demonstrates a novel proof‐of‐concept to implement pentacene derivatives as emitters for the third generation of light‐emitting electrochemical cells based on small‐molecules (SM‐LECs). Here, a straightforward procedure is shown to control the chromaticity of pentacene‐based lighting devices by means of a photoinduced cycloaddition process of the 6,13‐bis(triisopropylsilylethynyl) (TIPS)‐pentacene that leads to the formation of anthracene‐core dimeric species featuring a high‐energy emission. Without using the procedure, SM‐LECs featuring deep‐red emission with Commission Internationale d'Eclairage (CIE) coordinates of x = 0.69/y = 0.31 and irradiance of 0.4 μW cm^?2 are achieved. After a careful optimization of the cycloaddition process, warm white devices with CIE coordinates of x = 0.36/y = 0.38 and luminances of 10 cd m^?2 are realized. Here, the mechanism of the device is explained as a host–guest system, in which the dimeric species acts as the high‐energy band gap host and the low‐energy bandgap TIPS‐pentacene is the guest. To the best of the knowledge, this work shows the first warm white SM‐LECs. Since this work is based on the archetypal TIPS‐pentacene and the photoinduced cycloaddition process is well‐knownfor any pentacenes, this proof‐of‐concept could open a new way to use these compounds for developing white lighting sources.     

Modelling of the porous anodizing of aluminium: Generation of experimental input data and optimization of the considered model

The current paper considers the interdependency between the current density, the anodic overpotential and the temperature during the porous anodizing of aluminium in a sulphuric acid electrolyte. In contrast to common anodizing experiments, a sequence of increasing current densities is applied to each electrode. As demonstrated, this anodizing approach allows evaluating stationary anodic potentials up to very high current densities without being confronted with anomalous oxide growth. Additionally, anodizing is performed at controlled electrolyte and electrode temperature. Due to its large influence on the electrochemical behaviour, the control of the electrode temperature is important when studying the temperature dependency of the process. Based on the experimental evolutions a macroscopic model is presented, describing the relation between the considered general process parameters. It is demonstrated that a relatively simple expression is capable of well describing the experimental data in the extensive range of temperatures and current densities.     

Quantizer offset selection for improved requantization transcoding

In this paper, we provide an analysis of the requantization problem in order to improve the requantization process. This analysis is based on theoretical R-D results of requantized Laplacian sources instead of minimizing requantization errors as commonly found in the literature. We derive the effective quantizer characteristic by applying superposition to the quantizer characteristics of encoder and transcoder. Further investigation shows that the effective quantizer has a periodic property. Using the memoryless property of the probability distribution function and the periodic property of the effective quantizer characteristic, we derive expressions for entropy and distortion. Based on the theoretical R-D model, requantization for fine and coarse quantized signals is investigated. The analysis of the R-D behavior shows that a heuristic can be derived which improves the requantization process. Finally, the results from the R-D analysis are verified for requantization transcoding of H.264/AVC video streams. We show that the transcoding process for H.264/AVC video streams, which corresponds to coarse quantization, is improved with gains up to 1 dB.     

Determination of synchronous machine parameters using networksynthesis techniques

This paper deals with the problem of the determination of synchronous machine parameters starting from two-port information. Network synthesis techniques are used to show that no unique solution can be found for models containing more than one damper winding. Only a limited number of parameters can be determined in a unique way from two-port information