A Novel (DDCC-SFG)-Based Systematic Design Technique of Active Filters

This paper proposes a novel idea for the synthesis of active filters that is based on the use of signal-flow graph (SFG) stamps of differential difference current conveyors (DDCCs). On the basis of an RLC passive network or a filter symbolic transfer function, an equivalent SFG is constructed. DDCCs’ SFGs are identified inside the constructed ‘active’ graph, and thus the equivalent circuit can be easily synthesized. We show that the DDCC and its ‘derivatives’, i.e. differential voltage current conveyors and the conventional current conveyors, are the main basic building blocks in such design. The practicability of the proposed technique is showcased via three application examples. Spice simulations are given to show the viability of the proposed technique

Communication Platform Payload Definition (CPPD) study. Volume 3: Addendum

This is Volume 3 (Addendum) of the Ford Aerospace & Communications Corporation Final Report for the Communication Platform Payload Definition (CPPD) Study Program conducted for NASA Lewis Research Center under contract No. NAS3-24235. This report presents the results of the study effort leading to five potential platform payloads to service CONUS and WARC Region 2 traffic demand as projected to the year 2008. The report addresses establishing the data bases, developing service aggregation scenarios, selecting and developing 5 payload concepts, performing detailed definition of the 5 payloads, costing them, identifying critical technology, and finally comparing the payloads with each other and also with non-aggregated equivalent services

History of the Domestic Violence Coordinating Committee: 1987-2000

This chapter describes the emergence of an entity dedicated to improving inter-agency coordination in domestic violence service delivery, the Domestic Violence Coordinating Committee (DVCC), then charts its work and activity level from its formation in 1987 to the time this research was conducted in 2000. In addition to an overview of the history of the DVCC, this chapter includes a discussion of the factors found pertinent for success and failure of DVCC, and a concluding section where these themes are drawn into an analytical framework. Special attention is given to the role of the police department and its relationships over time with the DVCC and with the individual agencies in the domestic violence service community

Point defect structure in CdTe and ZnTe thin films

Були досліджені точкові дефекти структури (ТДС) в тонких плівках CdTe та ZnTe, вирощених методом квазі-замкнутого обєму на різних підкладках. Плівки були проаналізовані методом рентгенівської дифракції і скануючої електронної мікроскопії. Для вивчення точкових дефектів, були досліджені співвідношення провідність-температура і темна-ВАХ-струмові характеристики з використанням теорії просторового заряду обмежених струмів. Глибокі енергетичні рівні в забороненій зоні вивчалися методом інжекційної спектроскопії. У забороненій зоні як CdTe так і ZnTe спектр центрів пасток і акцепторів з різними енергіями не виявлено. Для моделі ТДС плівок був застосований квазі-хімічний формалізм. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/3602Были исследованы точечные дефекты структуры (ТДС) в тонких пленках CdTe и ZnTe, выращенных методом квази-замкнутого объем на различных подложках. Пленки были проанализированы методом рентгеновской дифракции и сканирующей электронной микроскопии. Для изучения точечных дефектов, были исследованы соотношения проводимость-температура и темная-ВАХ- токовые характеристики с использованием теории пространственного заряда ограниченных токов. Глубокие энергетические уровни в запрещенной зоне изучались методом инжекционной спектроскопии. В запрещенной зоне как CdTe так и ZnTe спектр центров ловушек и акцепторов с различными энергиями не выявлено. Для модели ТДС пленок был применен квази-химический формализм. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/3602The point defect structure (PDS) in CdTe and ZnTe thin films grown by the quasi-close volume method on different substrates was investigated. The films were analyzed by X-ray diffraction and scanning electron microscopy. To study the point defects the conductivity– temperature relationships and dark voltage–current characteristics using the theory of space charge limited currents were investigated. The deep energy levels in the band gap (BG) were studied by the method of injection spectroscopy. In the BG of both CdTe and ZnTe a range of trap centers and acceptors with different energy were revealed. To model the PDS in the films the quasi-chemical formalism was applied. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/360

DVCC Based Current-Mode First Order All-Pass Filter and Quadrature Oscillator

DergiPark: 245946trakyafbdA current mode first-order all-pass filter configuration is proposed. The presented circuit uses a single differential voltage current conveyor (DVCC), a capacitor and resistors. High output impedance of the proposed filter enables the circuit to be cascaded without additional buffers. To demonstrate the performance of the proposed filter a new current mode quadrature oscillator is given as an application example. Oscillator is implemented through the proposed first order all-pass filter and integrator as the building blocks. Furthemore the effects of tracking errors of the DVCC on oscillation condition and frequency are investigated. The theoretical results are verified with PSPICE simulations using a new CMOS realization of DVCC

Intimate Partner Violence in Omaha

While the greater Omaha area has an extensive network of service providers addressing the needs of Intimate Partner Violence (IPV) survivors and has made great strides to increase collaboration and outreach, opportunities exist to enhance service delivery according to this report

Virtual Reference for Video Collections: System Infrastructure, User Interface and Pilot User Study

A new video-based Virtual Reference (VR) tool called VideoHelp was designed and developed to support video navigation escorting, a function that enables librarians to co-navigate a digital video with patrons in the web-based environment. A client/server infrastructure was adopted for the VideoHelp system and timestamps were used to achieve the video synchronization between the librarians and patrons. A pilot usability study of using VideoHelp prototype in video seeking was conducted and the preliminary results demonstrated that the system is easy to learn and use, and real-time assistance from virtual librarians in video navigation is desirable on a conditional basis

Low-Voltage Ultra-Low-Power Current Conveyor Based on Quasi-Floating Gate Transistors

The field of low-voltage low-power CMOS technology has grown rapidly in recent years; it is an essential prerequisite particularly for portable electronic equipment and implantable medical devices due to its influence on battery lifetime. Recently, significant improvements in implementing circuits working in the low-voltage low-power area have been achieved, but circuit designers face severe challenges when trying to improve or even maintain the circuit performance with reduced supply voltage. In this paper, a low-voltage ultra-low-power current conveyor second generation CCII based on quasi-floating gate transistors is presented. The proposed circuit operates at a very low supply voltage of only ±0.4 V with rail-to-rail voltage swing capability and a total quiescent power consumption of mere 9.5 µW. Further, the proposed circuit is not only able to process the AC signal as it's usual at quasi-floating gate transistors but also the DC which extends the applicability of the proposed circuit. In conclusion, an application example of the current-mode quadrature oscillator is presented. PSpice simulation results using the 0.18 µm TSMC CMOS technology are included to confirm the attractive properties of the proposed circuit