Results 31 to 40 of about 1,090,025 (303)
An Alkali Amide Approach to Triphosphabenzenes
Angewandte Chemie, EarlyView.Alkali metal amides offer a simple route to phosphorus aromatics. LiNMe2 catalyzes [2+2+2] cyclotrimerization of a phosphaalkyne, while tetrahydrofuran (THF) stabilizes a λ4‐triphosphabenzene anion intermediate. Using KN(SiMe3)2 switches reactivity to arene C(sp3)─H activation, giving benzylated λ4‐triphosphabenzenes and rare λ5‐triphosphabenzenes ...
Owen J. Jones +2 more
wiley +2 more sources
To Greater Twist: A Kinetically Biased π‐Radical Cascade
Angewandte Chemie, EarlyView.π‐Radical cascades enable step‐economic construction of complex polycyclic aromatic frameworks. In this work, we show that a multifurcating pathway can be kinetically steered toward a single, more distorted product. This counterintuitive “falling‐upward” outcome arises from an intrinsic mechanistic bias, revealing a broader dimension of control in π ...
Yong Yang +8 more
wiley +2 more sources
Matrix transformations and Walsh′s equiconvergence theorem [PDF]
International Journal of Mathematics and Mathematical Sciences, 2005 In 1977, Jacob defines Gα, for any 0 ≤ α < ∞, as the set of all complex sequences x such that . In this paper, we apply Gu − Gv matrix transformation on the sequences of operators given in the famous Walsh′s equiconvergence theorem, where we have that the difference of two sequences of operators converges to zero in a disk.
Chikkanna R. Selvaraj, Suguna Selvaraj
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A generalized Walsh system for arbitrary matrices
Demonstratio Mathematica, 2019 In this paper we study in detail a variation of the orthonormal bases (ONB) of L2[0, 1] introduced in [Dutkay D. E., Picioroaga G., Song M. S., Orthonormal bases generated by Cuntz algebras, J. Math. Anal.
Harding Steven N., Picioroaga Gabriel
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Matrix Summability of Walsh–Fourier Series
Mathematics, 2022 The presented paper discusses the matrix summability of the Walsh–Fourier series. In particular, we discuss the convergence of matrix transforms in L1 space and in CW space in terms of modulus of continuity and matrix transform variation.
Ushangi Goginava, Károly Nagy
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Design and Implementation of Sequency-Ordered Fast Walsh-Hadamard Transform (FWHT) in WCDMA
Tikrit Journal of Engineering Sciences, 2013 This paper presents the implementation of the Fast Walsh Hadamard Transform (FWHT) in sequence ordered method, in order to minimize the interference due to two users trying to transmit at the same time, and an attempt has made to simulate them.
Safaa M. Z. Al-Ubaidi
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Walsh‐Hadamard‐transform‐based SC‐FDMA system using WARP hardware
ETRI Journal, 2021 Single‐carrier frequency division multiple access (SC‐FDMA) is currently being used in long‐term evolution uplink communications owing to its low peak‐to‐average power ratio (PAPR). This study proposes a new transceiver design for an SC‐FDMA system based
Shri Ramtej Kondamuri, Sundru Anuradha
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Sampling with Walsh Transforms
CoRR, 2015 With the advent of massive data outputs at a regular rate, admittedly, signal processing technology plays an increasingly key role. Nowadays, signals are not merely restricted to physical sources, they have been extended to digital sources as well. Under the general assumption of discrete statistical signal sources, we propose a practical problem of ...
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Gabor systems on positive half line via Walsh-Fourier transform
Karpatsʹkì Matematičnì Publìkacìï, 2020 Gabor systems play a vital role not only in modern harmonic analysis but also in several fields of applied mathematics, for instances, detection of chirps, or image processing.
O. Ahmad, N.A. Sheikh
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Evolution of Walsh Transforms with Genetic Programming
Proceedings of the Companion Conference on Genetic and Evolutionary Computation, 2023 The design of Boolean functions which exhibit high-quality cryptography properties is a crucial aspect when implementing secure stream ciphers. To this end, several methods have been proposed to search for secure Boolean functions, and, among those, evolutionary algorithms play a prominent role.
Luigi Rovito +2 more
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