排序方式: 共有68条查询结果,搜索用时 15 毫秒
61.
All-pass filters are widely used to shift the phase of an analog signal without altering its magnitude. In this study, a new realization of all-pass filter using one current controlled conveyor (CCCII), one operational amplifier (OP-AMP) and two capacitors is presented. The proposed circuit does not use any resistors thus it is suitable for easy integration. Also the pole frequency of the proposed circuit can be tuned electronically. Simulation results are included to verify theory. 相似文献
62.
Ugur Cam Cakir Cem Oguzhan Cicekoglu 《AEUE-International Journal of Electronics and Communications》2004,58(4):296-298
A novel transimpedance-mode first-order all-pass filter configuration is proposed. It uses a single operational transresistance amplifier (OTRA) and few passive components. The proposed circuit is structurally all-pass that does not impose any component matching condition. The proposed circuit is insensitive to parasitic input capacitances and input resistances due to the internally grounded input terminals of the OTRA. It provides an alternative realization of phase equalizers for analog signal processing applications by providing also current-to-voltage conversion. The theoretical results are verified with PSPICE simulations using a CMOS realization of OTRA. 相似文献
63.
Emre Sefer Fatma Baycan Koyuncu Eda Oguzhan Sermet Koyuncu 《Journal of polymer science. Part A, Polymer chemistry》2010,48(20):4419-4427
A new near‐infrared switchable electrochromic polymer containing carbazole pendant (poly‐SNSC), synthesized by electrochemical polymerization of 2,5‐bis‐dithienyl‐1H‐pyrrole (SNS) main chain, has been prepared. The electrochemical and optical properties of SNSC monomer and its polymer have been investigated. Because of having two different electro‐donor moieties; that is, carbazole and SNS, SNSC gave two separate electrochemical oxidation and also light brown color of the film in the neutral state turn into gray on oxidation. An electrochromic device, contructed in the sandwich configuration [indium tin oxide (ITO)‐coated glass/anodically coloring polymer (poly‐SNSC)//gel electrolyte//cathodically coloring polymer (PEDOT)/ITO‐coated glass] and exhibited a high coloration efficiency (1216 cm2 C–1), a very short response time (about 0.3 s), low driving voltage, and a high redox stability. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010 相似文献
64.
Muhammed A. Ibrahim Hakan Kuntman Oguzhan Cicekoglu 《Circuits, Systems, and Signal Processing》2003,22(5):525-536
In this work, a voltage-mode canonical first-order all-pass filter is presented. The
filter contains only a single resistor, a single capacitor, and a single differential difference
current conveyor (DDCC). No passive component-matching constraints are required. A
complementary metal oxide semiconductor CMOS implementation of a DDCC is given to
simulate the proposed circuit with a Spice simulation program whose results illustrate the
high performance of the circuit. 相似文献
65.
A novel shot-cut detection method for black and white (B&W) archive films, employing the best-fitting kernel between two consecutive image frames is proposed in this paper. The best-fitting kernel, obtained using least squares, is used to estimate the second frame of each successive frame pair. The absolute frame difference between estimated and original image frames is utilized as criterion to decide a candidate scene-cut. A double thresholding approach, consisting of global and local adaptive thresholds, is used in this stage. Obtained candidates are forwarded to a confirmation stage to exclude single-frame defects, frequently encountered in archive film sequences. Experimental results show that the proposed method gives favorable result for B&W degraded archive films, compared to methods proposed in the literature. 相似文献
66.
Bilgin Metin Shahram Minaei Oguzhan Cicekoglu 《Analog Integrated Circuits and Signal Processing》2007,51(3):181-189
The signal handling capability of the filters is called dynamic range. In this paper, a topological form for the synthesis
of filters with high dynamic range is proposed. A biquad notch/all-pass filter is shown in conformity with the given topological
form. It is shown that there is a trade-off between dynamic range and high input impedance property. The presented circuit
is compared with other notch filters in the literature. It has less number of components, better high-frequency response and
dynamic range compared to others. Since the circuit includes a minimum number of resistors, it can easily provide electronically
tunable circuits through resistor/controlled current conveyor replacement. Simulations are performed to verify the theoretical
results. Routh-Hurwitz stability analyses are also given. 相似文献
67.
Richard P. Metzger JR Oguzhan Cifdaloz Thanate Dhirasakdanon Bruno Welfert 《International Journal of Mathematical Education in Science & Technology》2013,44(6):877-896
This paper describes an interactive modelling, simulation, animation, and real-time control (MoSART) environment for a class of ‘cart-pendulum’ electromechanical systems that may be used to enhance learning within differential equations and linear algebra classes. The environment is useful for conveying fundamental mathematical/systems concepts through computer-aided analysis, design, graphical visualization, and 3D animation. Referred to as Cart-Pendulum Control3D-Lab1, the environment is based on Microsoft Windows/Visual C++/Direct-3D and MATLAB/Simulink2. Pull-down menus provide access to systems/models/control laws, exogenous signals, parameters, animation models and visual indicators, a suite of (easy-to-modify) Simulant diagrams containing models and control laws, MATLAB m-files for detailed analysis and design, and detailed documentation for each of the above. Three blocks enable animation, joystick inputs, and real-time animation within Simulant. Examples are presented to illustrate the utility of the environment as a valuable tool for analysing/visualizing the above class of electromechanical systems and for enhancing mathematics instruction. 相似文献
68.
Holographic pixel super-resolution in portable lensless on-chip microscopy using a fiber-optic array
Bishara W Sikora U Mudanyali O Su TW Yaglidere O Luckhart S Ozcan A 《Lab on a chip》2011,11(7):1276-1279
We report a portable lensless on-chip microscope that can achieve <1 μm resolution over a wide field-of-view of ~ 24 mm(2) without the use of any mechanical scanning. This compact on-chip microscope weighs ~ 95 g and is based on partially coherent digital in-line holography. Multiple fiber-optic waveguides are butt-coupled to light emitting diodes, which are controlled by a low-cost micro-controller to sequentially illuminate the sample. The resulting lensfree holograms are then captured by a digital sensor-array and are rapidly processed using a pixel super-resolution algorithm to generate much higher resolution holographic images (both phase and amplitude) of the objects. This wide-field and high-resolution on-chip microscope, being compact and light-weight, would be important for global health problems such as diagnosis of infectious diseases in remote locations. Toward this end, we validate the performance of this field-portable microscope by imaging human malaria parasites (Plasmodium falciparum) in thin blood smears. Our results constitute the first-time that a lensfree on-chip microscope has successfully imaged malaria parasites. 相似文献