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The resonant characteristics of single split ring resonator-based metamaterial devices with single gap are presented using the analytical formulation developed for the lumped element equivalent circuit model. The characteristics of the metamaterial resonators have been investigated for different ring sizes, gap widths and substrate permittivity. Equivalent circuit model is developed for two ring s...Show More
Micro embedded ring resonator using Quantum Confined Stark Effect (QCSE) is studied for its parameter variations with respect to spectral shape and modulation speed. The effects of number of quantum wells, coupling coefficient, ring detuning, symmetry of the structure and temperature on the spectrum are studied here.Show More
In order to construct nonregular power rings, the concept of regular semi-ideal with respect to a subring is introduced. Then several constructive theorems of HX ring and power ring are established and some examples of non-regular power rings are constructed which contain some nonregular HX rings.Show More
A utilization of split ring resonator (SRR) for developing compact narrowband microstrip bandpass filter (BPF) is presented. The proposed BPF is intended to work at center frequency of 880MHz implementable for intermediate frequency (IF) radar application. The BPF is designed on a 1.9mm thick Roger RT/Duroid® 6010 dielectric substrate with the substrate dimension of 30mm × 25mm. Some parametric st...Show More
Thermal output is a source of large error in the thermal deformation measurement of specimens under temperature change when a strain gauge is used. In this study, the digital image correlation (DIC) method is employed to measure the full-field thermal deformation and strain of a double ring structure consisting of an inner aluminum ring and an outer titanium ring. The thermal deformation of the ri...Show More
A two-dimensional axisymmetric finite element model of metal multi-convolution ring was established by using FEM analysis software ANSYS. Influence on mechanical properties and sealing performance in working condition resulted from changes of structure parameters such as the thickness, wave height, crest radius, trough radius were analyzed by orthogonal design, put forward some suggestions for the...Show More
This paper presents a wireless power transfer application with electrical coupling. The proposed structure uses a Complementary Split Ring Resonator (CSRR) as defected ground structure (D GS). The top layer is very simple with a single open-ended transmission line. A simulation with loss has been done in this letter, and the operating frequency of the designed transmission line is 0.94 GHz, with a...Show More
In this paper, a band-pass plasmonic filter based on Metal-Insulator-Metal (MIM) waveguides and its modified structures are designed and investigated theoretically and numerically. The filter consists of two circular ring resonator and its modified structures which has narrow gaps in the middle of resonant rings. To study their performance in different structures, propagation modes of surface plas...Show More
This paper introduces a new technique for enhancing the selectivity (or the quality factor, Q-factor) of frequency selective surfaces (FSS) for sensing applications. The proposed FSS functions as a free-space bandpass resonator, designed to sense the changing dielectric properties of minute amount of materials loaded on the FSS. The Q-enhancement technique is mainly based on two concepts; enhancin...Show More
The rectangular sealing ring mainly used in static sealing structure is usually subject to sealing failure, permanent deformation and other problems in practical use. The two-dimensional axis-symmetrical finite element analytical model of rectangular sealing ring during working is established to deal with the above prominent problems based on Von Mises yield principle, virtual work principle, axia...Show More
The study discusses the modelling and the performance analysis of the single, double and triple rings as an absorber. The absorber has been modelled by Fr-4 substrate sandwiched between copper-based rings and ground. The single ring provides absorption of 90.2% at 10.5GHz with Q-factor of 728. The double ring structure provides the maximum absorption of 95.5% and 92.5% at 7.6 GHz and 10.5GHz respe...Show More
In this paper, we aim to analyze the algebraic structure of repeated-root quasi-cyclic codes of length p^{k}{n}\ell and index \ell over the finite field \mathbb{F}_{q}, where k is a positive integer, q=p^{\alpha} and (n,p)=1. For this purpose, a quasi-cyclic code over \mathbb{F}_{q} is regarded as a linear code over an auxiliary ring. By introducing a ring isomorphism, we provide a o...Show More
Irreversible cumulative damage and fatigue cracks may happen during service of metallic structure. To tackle the contradiction between the coverage and sensitivity of the conventional electromagnetic resonant sensor, a metal crack sensor with ring resonator coupled slow wave structure is studied in this paper. The resonant unit is compact due to the slow wave effect and therefore has a good detect...Show More
Angle ring which be placed in the big gap between the winding end and the yoke, could improve the electric field distribution and the insulation reliability of the transformer. Therefore, the optimal arrangement of the angle ring is an important part of the main insulation structure design. In this paper, multi-objective optimization algorithm, particle swarm optimization algorithm and finite elem...Show More
This paper focuses on structure optimization of wedge-ring joint of underwater robot based on response surface method (RSM). Experiments for the combination of the 4 parameters of Unmanned Underwater Vehicle's (UUV) wedge-ring joint are designed in combination with central composite experimental method (CCD). FEA software ANSYS is used to get the respond data of structure stress and mass of wedge-...Show More
We propose a PANDA ring resonator structure based on silicon on insulator material. Modelling is carried out using FDTD based simulation tool. The miniaturized structure of the proposed device makes it suitable for on chip nanophotonic applications. The effect of variation of ring radius and gap separation between the rings of the PANDA resonator structure on transmission characteristics is analyz...Show More
A quadruple, compact multi-layered metamaterial absorber operating in the frequency band of C, X, Ku is presented in this paper. The multi-layered structure is formed by integrating the nested circular rings as the top layer and combination of split ring resonators and rings as the lower layer. The absorptivity plot of individual layer as well as absorptivity plot of complete multi-layered structu...Show More
The paper focuses on non-invasive crack detection in metallic surfaces using Complementary Split Square Ring Resonators (CSSRR). The sensor is designed to operate in the range of 2 to 3 GHz and is highly sensitive to changes in the electromagnetic environment. When cracks or damage occur in the metallic sheet, electromagnetic properties change. These changes can be detected by the sensor through v...Show More
This paper is based on the ultra-thin wideband absorber for Ku & K-band applications with a 40% fractional bandwidth. The bandwidth of the designed absorber is 8.1 GHz (15.7GHz to 23.8GHz) at absorptivity of more than 90% and 7.3 GHz (16.1 GHz to 23.4 GHz) at absorptivity more than 98%with a center frequency of 19.8GHz. The structure is a single dielectric layer of FR4 having a thickness of 1.6mm....Show More
This letter presents a miniaturized geodetic choke ring antenna for high-precision Global Navigation Satellite System applications. The antenna consists of crossed dipoles that are fed by two coaxial feedlines, a resonant ring over the dipoles, a cavity-backed reflector with a saw-tooth structure, and a miniaturized choke ring. The choke ring alongside the saw-tooth structure can improve the front...Show More
A development of novel compact microstrip bandpass filter (BPF) made of split ring resonator (SRR) is presented. The proposed microstrip BPF is intended to be used for 2.4GHz wireless communication application. It is designed on a grounded 1.9mm thick high relative permittivity Roger RT/Duroid r 6010 dielectric substrate with the dimension of 25mm 25mm. Some parametrical studies to obtain the opti...Show More
A design and simulation analysis of multi-band metamaterial absorber (MA) is discussed in this paper. The MA has a compact size of 9 mm × 9 mm × 1 mm and is designed using FR-4 substrate as a dielectric layer with a relative permittivity of 4.4. The FR-4 dielectric layer is sandwiched by the copper patch having three annular rings at the top, and a copper ground at the bottom. The proposed MA reso...Show More
With the recent emergence of pen-based and touch based input devices such as Apple's iPad and Samsung's Galaxy Tablet, it has become more feasible now to input chemical formulas directly by handwriting, which is more natural and efficient than the traditional template-based input methods. In this paper, we propose an effective graph-based chemical structural analysis approach for online progressiv...Show More
Codes over Galois rings have been studied extensively during the last three decades. Negacyclic codes over GR(2a, m) of length 2s have been characterized: the ring R2(a, m, -1) = GR(2a, m)[x]/(x2s t 1) is a chain ring. Furthermore, these results have been generalized to λ-constacyclic codes for any unit λ of the form 4z - 1, z ∈ GR(2a, m). In this paper, we study more general cases and investigate...Show More

Stably free cancellation for group rings of metacyclic type

Quarterly Journal of Mathematics
Year: 2019 | Volume: 70, Issue: 2 | Journal Article |
Let p,q be primes such that q\,|\,p- 1. Write F_{n} for the free group of rank n\geq 1 and let G(p,q)=C_{p}\rtimes C_{q}. We show that any stably free module over \mathbb{Z}[G(p,q)\times F_{n}] is necessarily free.Show More

Stably free cancellation for group rings of metacyclic type

Year: 2019 | Volume: 70, Issue: 2 | Journal Article |