In this paper, we demonstrated that 1-3 PZT/polymer composites, fabricated using PZT-4 ceramic and a polymer possessing a high glass transition temperature and low loss, can be used as high power ultrasonic transducer materials for high intensity focused ultrasound (HIFU) applications. The mechanical quality factor of the 1-3 composite with 64% ceramic volume fraction is over 200. The dielectri...

A Coplanar Waveguide Fed ultra wide band (UWB) slotted Hexagonal patch antenna which finds application in wireless communication is presented here. It was designed to operate in the UWB range ( 3.1GHz to 10.60GHz). The antenna presented here is designed on FR4 substrate with loss tangent δ=0.0025 and dielectric constant 4.4. The dimension of the proposed antenna is 34 X 29 X 1.6 mm. The fundame...

In the paper, tangent similarity measure of neutrosophic refined set is proposed and its properties are studied. The concept of this tangent similarity measure of single valued neutrosophic refined sets is an extension of tangent similarity measure of single valued neutrosophic sets. Finally, using the propsed refined tangent similarity measure of single valued neutrosophic sets, a numerical ex...

We interpret the finite Zariski tangent spaces Ta(X,Fqm) to an affine variety X ⊂ Fq n as linear codes. If the degree ofX is relatively prime to the characteristic p = charFq, we show that the minimum distance of Ta(X,Fqm) stabilizes while varying a ∈ X(Fqm) := X ∩ Fnqm and m ∈ N. The article provides a pseudocode for obtaining the generic minimum distance of a tangent code and points, at which...

This paper describes the viscoelastic behaviour of sintered steels with porosities of 12, 20 and 33%, using a dynamic mechanical analyser. Test specimens were prepared from premix powders of 100–150 mm size by a process of die compaction, delubrication and sintering. The influences of test temperature and vibrational frequency on storage and loss modulus and tangent delta have been investigated...

The results of the studies frequency and temperature dependences dielectric loss tangent, real imaginary parts permittivity in MnGaInSe4 single crystals an alternating electric field are presented. It was found that main type losses range 8×103 – 3×105 Hz electrical conductivity is characterized by band-hopping mechanism. activation energies current carriers determined. underwent significant di...

In pattern recognition, statistical modeling, or regression, the amount of data is the most critical factor a ecting the performance. If the amount of data and computational resources are near in nite, many algorithms will provably converge to the optimal solution. When this is not the case, one has to introduce regularizers and a-priori knowledge to supplement the available data in order to bo...

From this result one can easily deduce I (H) = n 1. For a detailed discussion of Cheeger’s constant and related results, one can consult [Cha, Chapter 6]. In general, it is very di¢ cult to know if the isoperimetric constant is positive or not and it is almost impossible to compute it explicitly if it is known to be positive. In this short note, we prove that the isoperimetric constant is posit...

For uniformly chosen random α ∈ [0, 1], it is known the probability the nth digit of the continued-fraction expansion, [α]n converges to the Gauss-Kuzmin distribution P([α]n = k) ≈ log2(1 + 1/k(k + 2)) as n → ∞. In this paper, we show the continued fraction digits of √ d, which are eventually periodic, also converge to the Gauss-Kuzmin distribution as d → ∞ with bounded class number, h(d). The ...