Results 301 to 310 of about 16,144,289 (353)

Design and Analysis of Direct Digital Frequency Synthesizer

2008 First International Conference on Emerging Trends in Engineering and Technology, 2008
This paper consists of design and analysis of direct digital frequency synthesizer (DDFS). Its key elements are: phase accumulator, a phase to amplitude converter (sine ROM) also called look-up table (LUT), a digital to analog converter (DAC) and a filter. The phase values are generated using modulo 2N overflowing property of a N-bit phase accumulator.
Sunita Khilar, Kiran Parmar, S. Saumi, Kankar S. Dasgupta   +3 more
openaire   +1 more source

“Design” in der chemischen Synthese – eine Fiktion?

Angewandte Chemie, 2006
In der allgemein akzeptierten Definition umfasst der Vorgang des „Designens“ den Entwurf einer Form, die eine vorgegebene Funktion möglichst gut erfüllt und darüber hinaus als ästhetisch empfunden wird. Dies unterstellt jedoch einen gestalterischen Freiraum, der in der Synthese neuer chemischer Verbindungen nicht gegeben ist.
Jansen, M., Schön, J.
openaire   +2 more sources

Rational Crystalline Covalent Organic Frameworks Design for Efficient CO2 Photoreduction with H2O.

Angewandte Chemie, 2019
Solar energy-driven conversion of CO2 into fuels with H2O as sacrificial agent is still a challenging research field in photosynthesis. Here, a series of crystalline porphyrin-tetrathiafulvalene covalent organic frameworks (COFs) are synthesized and used
Meng Lu, Jiang Liu, Qiang Li, Mi Zhang, Ming Liu, Jinlan Wang, Da-Qiang Yuan, Y. Lan   +7 more
semanticscholar   +1 more source

Molecular design and syntheses of glycopolymers

Progress in Polymer Science, 2001
Recent progress in precision polymerization has made it possible to design a variety of macromolecules of controlled structure. This review article is concerned with recent topics in the molecular design and syntheses of glycopolymers, particularly focusing on those of well-defined structure.
openaire   +1 more source

Alleviation of design loads by synthesizing evaluation function

Proceedings of the 41st SICE Annual Conference. SICE 2002., 2003
In the early phase of a design process, conceptualization and preliminary refinement are important processes in deciding the quality of a product; however, their implementation in computer systems is difficult. Interactive evolutionary computation (IEC) has provided us a solution to this problem by ignoring the designer's load of interacting with the ...
Shiose, Takayuki, Ishida, Ryohei, Nakayama, Yoshihito, Taura, Toshiharu   +3 more
openaire   +1 more source

Heterogeneous electrocatalysts design for nitrogen reduction reaction under ambient conditions

Materials Today, 2019
Ammonia, as an important carbon-free energy carrier and also an important chemical for producing fertilisers, is mainly synthesized by a traditional Haber–Bosch process with high energy consumption and large amounts of greenhouse gas emissions. Recently,
Y. Wan, Ji-Chuan Xu, R. Lv
semanticscholar   +1 more source

Design of frequency synthesizer in frequency-hopping transceiver

2013 IEEE 10th International Conference on ASIC, 2013
Several key techniques of PLL-type (Phase-Locked Loop) frequency synthesizer for frequency-hopping transceiver are studied. Its structure is analyzed and the main parameters are proposed. A monolithic LC-tuned voltage controlled oscillator (LC-VCO) with low phase noise is fabricated in a TSMC 0.18μm RF (radio frequency) CMOS technology.
Yong Xu, Fei Zhao, Chen Hu, Zheng Sun, Yuanliang Wu, Jianwen Lu   +5 more
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Room temperature synthesized BaTiO 3 for photocatalytic hydrogen evolution

Journal of Alloys and Compounds, 2018
As a photocatalyst, barium titanate (BaTiO 3 ) has shown a great potential in photocatalytic water splitting for hydrogen evolution. In this work, BaTiO 3 nanoparticles were synthesized at room temperature conditions under ambient pressure.
Tao Chen, J. Meng, Shiyan Wu, Jing-Ke Pei, Q. Lin, Xiao Wei, Jixue Li, Ze Zhang   +7 more
semanticscholar   +1 more source

Synthesizing Knowledge in Design Research

2016
This chapter discusses knowledge synthesis in Design Research, bringing together the perspectives of experimental Design Research, or Research in Design Context that is treated extensively elsewhere in this book, with Design Inclusive Research as well as Practice-Based Design Research. Specific attention is paid to the question of how practice-based or
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Hardware Design of a Digital Synthesizer

Computer Music Journal, 1983
The synthesizer discussed here was designed as a means of generating time-variable spectra by evaluation of algebraic time-dependent functions. In addition to additive synthesis algorithms, many algebraic functions are known that efficiently yield such spectra.
openaire   +1 more source