30 citations · 82 across the 10 of their papers we have counts for
11 papers
Higher Order Approximation of Continuous Functions by a Modified Meyer-König and Zeller-Type Operator
Ivan Gadjev, Parvan Parvanov, Rumen Uluchev
A new Goodman-Sharma type modification of the Meyer-König and Zeller operator for approximation of bounded continuous functions on [0,1) is presented. We estimate the approximation…
On a New Modification of Baskakov Operators with Higher Order of Approximation
Ivan Gadjev, Parvan Parvanov, Rumen Uluchev
A new Goodman-Sharma modification of the Baskakov operator is presented for approximation of bounded and continuous on functions. In our study on the approximation e…
Higher Order Approximation of Functions by Modified Goodman-Sharma Operators
Ivan Gadjev, Parvan Parvanov, Rumen Uluchev
Here we study the approximation properties of a modified Goodman-Sharma operator recently considered by Acu and Agrawal in 2019. This operator is linear but not positive. It has th…
On the Constants and Extremal Function and Sequence for Hardy Inequalities in and
Ivan Gadjev
We study the behavior of the smallest possible constants and in Hardy inequalities $$ \int_a^b\left(\frac{1}{x}\int_a^xf(t)dt\right)^p\,dx\leq d(a,b)\,\int_a^b [f(x)…
Sharp Hardy's Inequalities in Hilbert Spaces
Dimitar K. Dimitrov, Ivan Gadjev, Mourad E. H. Ismail
We study the behavior of the smallest possible constants and in Hardy's inequalities $$ \int_a^b\left(\frac{1}{x}\int_a^xf(t)dt\right)^2\,dx\leq d(a,b)\,\int_a^b [f(…
Tapered helical undulator system for high efficiency energy extraction from a high brightness electron beam
Y. Park, R. Agustsson, W. J. Berg +18
In this paper we discuss the design choices and construction strategy of the tapered undulator system designed for a high energy extraction efficiency experiment in the ultraviolet…
Hardy's inequalities in finite dimensional Hilbert spaces
Dimitar K. Dimitrov, Ivan Gadjev, Geno Nikolov +1
We study the behaviour of the smallest possible constants and in Hardy's inequalities $$ \sum_{k=1}^{n}\Big(\frac{1}{k}\sum_{j=1}^{k}a_j\Big)^2\leq d_n\,\sum_{k=1}^{n}a…
An inverse free electron laser acceleration-driven Compton scattering X-ray source
I. Gadjev, N. Sudar, M. Babzien +13
The generation of X-rays and γ-rays based on synchrotron radiation from free electrons, emitted in magnet arrays such as undulators, forms the basis of much of modern X-ray science…
Demonstration of cascaded modulator-chicane micro-bunching of a relativistic electron beam
N. Sudar, P. Musumeci, I. Gadjev +9
We present results of an experiment showing the first successful demonstration of a cascaded micro-bunching scheme. Two modulator-chicane pre-bunchers arranged in series and a high…
Experimental characterization of electron beam driven wakefield modes in a dielectric woodpile Cartesian symmetric structure
P. D. Hoang, G. Andonian, I. Gadjev +8
The use of photonic structures in the terahertz (THz) spectral region may enable the essential characteristics of confinement, modal control, and electric field shielding for very…
Single shot, double differential spectral measurements of inverse Compton scattering in linear and nonlinear regimes
Y. Sakai, I. Gadjev, P. Hoang +18
Inverse Compton scattering (ICS) is a unique mechanism for producing fast pulses - picosecond and below - of bright X- to gamma-rays. These nominally narrow spectral bandwidth elec…