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Abstract

Details

Stories and Lessons from the World's Leading Opera, Orchestra Librarians, and Music Archivists, Volume 1: North and South America
Type: Book
ISBN: 978-1-80117-653-8

Abstract

Details

Applied Technical Analysis for Advanced Learners and Practitioners
Type: Book
ISBN: 978-1-78635-633-8

Article
Publication date: 27 July 2012

Siti Maisurah Mohd Hassan, Mohd Azmi Ismail, Nazif Emran Farid, Norman Fadhil Idham Muhammad and Ahmad Ismat Abdul Rahim

The purpose of this paper is to design and implement a fully integrated low‐phase noise and large tuning range dual‐band LC voltage‐controlled oscillator (VCO) in 0.13 μm…

Abstract

Purpose

The purpose of this paper is to design and implement a fully integrated low‐phase noise and large tuning range dual‐band LC voltage‐controlled oscillator (VCO) in 0.13 μm complementary metal oxide semiconductor (CMOS) technology.

Design/methodology/approach

Two parallel‐connected single‐band VCOs are designed to implement the proposed VCO. Adopting a simple and straight‐forward architecture, the dual‐band VCO is configured to operate at two frequency bands, which are from 1.48 GHz to 1.78 GHz and from 2.08 GHz to 2.45 GHz. A band selection circuit is designed to perform band selection process based on the controlling input signal.

Findings

The proposed VCO features phase noise of −104.7 dBc/Hz and −108.8 dBc/Hz at 1 MHz offset frequency for both low corner and high corner end of the low‐band operation. For high‐band operation, phase‐noise performance of −101.1 dBc/Hz and −110.4 dBc/Hz at 1 MHz offset frequency are achieved. The measured output power of the dual‐band VCO ranges from −8.4 dBm to −5.8 dBm and from −9.6 dBm to −8.0 dBm for low‐band and high‐band operation, respectively. It was also observed that the power differences between the fundamental spectrum and the nearby spurious tone range from −67.5 dBc to −47.7 dBc.

Originality/value

The paper is useful to both the academic and industrial fields since it promotes the concept of multi‐band or multi‐standard system which is currently in demand in the telecommunication industry.

Article
Publication date: 2 May 2017

El Amjed Hajlaoui

The purpose of this paper is to present a new dual-band printed monopole antenna with a partial ground with two notched bands based on electromagnetic band gap (EBG) structures. A…

Abstract

Purpose

The purpose of this paper is to present a new dual-band printed monopole antenna with a partial ground with two notched bands based on electromagnetic band gap (EBG) structures. A new type of EBG antenna with radiation patterns and antenna gains over the operating bands has been developed.

Design/methodology/approach

The proposed antenna consists of a pair of EBG structures using a transmission line model. The proposed antenna is designed on an FR4 substrate with a thickness of 1 mm and permittivity (er) = 4.3.

Findings

The measured results show good dual-band operations with −10 dB impedance bandwidths of 9.1 and 36.2 per cent centered at 2.45 and 6.364 GHz, respectively, which covers the wireless local area network (WLAN) operating bands.

Originality/value

A new type of EBG antenna with radiation patterns and antenna gains over the operating bands has been developed.

Details

Circuit World, vol. 43 no. 2
Type: Research Article
ISSN: 0305-6120

Keywords

Article
Publication date: 1 April 1993

Yu‐Jen Wu and Neil Goldsman

A computationally very efficient solution of the multi‐band homogeneous Boltzmann transport equation (MB‐HBTE) for Silicon is presented. We used a Legendre polynomial (LP…

Abstract

A computationally very efficient solution of the multi‐band homogeneous Boltzmann transport equation (MB‐HBTE) for Silicon is presented. We used a Legendre polynomial (LP) expansion approach to solve coupled Boltzmann transport equations. To account for the multi‐band model, a Boltzmann transport equation is formulated for each of four conduction energy bands. The respective Boltzmann equations are coupled through the interband phonon scatterings. Analytical methods using Legendre polynomials are combined with numerical techniques using matrices to solve the coupled system of MB‐HBTE's. The multi‐band calculation requires approximately 8 GPU seconds on a SUN SPARC workstation. The efficiency of this method proves to be appropriate for use in computer‐aided design (CAD) tools for semiconductor devices, and results for the distribution function agree with Monte Carlo (MC) calculations.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 12 no. 4
Type: Research Article
ISSN: 0332-1649

Article
Publication date: 26 January 2021

Elakkiya A., Radha Sankararajan and Sreeja B.S.

The proposed metamaterial absorber (MMA) has the following advantages: first, the structure of the MMA consists of one planar metallic resonator, which presents a new design…

Abstract

Purpose

The proposed metamaterial absorber (MMA) has the following advantages: first, the structure of the MMA consists of one planar metallic resonator, which presents a new design approach to obtain a multiband absorption response, rather than using multiple unit-cells in the one large unit cell or stacking different layers. Second, the simultaneous realization of triple-band and dual-band absorption (or bi-functional absorption) at five different frequencies can integrate the respective advantages of the triple functions of the triple-band MMA and double-band MMA, and therefore, the bi-functional MMA will find more application prospects than multiple-functional devices of triple-band and dual-band. Third, the authors simulated the three combinations of MMA here, which is indium tin oxide (ITO)-Polyimide-ITO, ITO-Teflon-ITO and ITO-polyethylene terephthalate (PET)-ITO for the same planar structure and achieve a high absorption rate. Finally, the proposed structure is polarization and angle independent in nature.

Design/methodology/approach

This absorption device consists of the top circular resonator, the middle insulating SiO2 medium layer and the bottom metallic copper ground plane placed on a substrate. The conductivity of the copper metal is s = 5.8 × 107 s/m. As the transmission of the MMA structure is zero, the substrate materials can be selected randomly. Totally four combinations of terahertz MMA are designed and simulated here which are ITO- SiO2 –ITO, ITO-Polyimide-ITO, ITO-Teflon-ITO and ITO- PET-ITO for the same planar structure.

Findings

Compared with previous MMAs, the proposed MMA has the following advantages: First, the structure of the MMA consists of one planar metallic resonator, which presents a new design approach to obtain a multiband absorption response, rather than using multiple unit-cells in the one large unit cell or stacking different layers. Second, the simultaneous realization of triple-band and dual-band absorption (or bi-functional absorption) at five different frequencies can integrate the respective advantages of the triple functions of the triple-band MMA and double-band MMA, and therefore, the bi-functional MMA will find more application prospects than multiple-functional devices of triple-band and dual-band. Third, the authors simulated the three combinations of MMA here, which is ITO-polyimide-ITO, ITO-Teflon-ITO and ITO- PET-ITO for the same planar structure and achieve a high absorption rate. Finally, the proposed structure is polarization and angle independent in nature.

Originality/value

First, the structure of the MMA consists of one planar metallic resonator, which presents a new design approach to obtain a multiband absorption response, rather than using multiple unit-cells in the one large unit cell or stacking different layers. Second, the simultaneous realization of triple-band and dual-band absorption (or bi-functional absorption) at five different frequencies can integrate the respective advantages of the triple functions of the triple-band MMA and double-band MMA, and therefore, the bi-functional MMA will find more application prospects than multiple-functional devices of triple-band and dual-band. Third, the authors simulated the three combinations of MMA here, which is ITO-polyimide-ITO, ITO-Teflon-ITO and ITO-PET-ITO for the same planar structure and achieve a high absorption rate. Finally, the proposed structure is polarization and angle independent in nature.

Details

Circuit World, vol. 48 no. 1
Type: Research Article
ISSN: 0305-6120

Keywords

Article
Publication date: 11 January 2021

Masood Molimoli Hajamohideen and Sreeja Balakrishanapillai Suseela

The purpose of the study is – in Microwave filter design, the performances of passive components are deteriorated by parasitics at gigahertz (GHz) frequency range. A compact and…

Abstract

Purpose

The purpose of the study is – in Microwave filter design, the performances of passive components are deteriorated by parasitics at gigahertz (GHz) frequency range. A compact and multi-stack electromagnetic band gap (EBG) structure is proposed with improved stop band characteristics at GHz frequency range in this work. This paper proposes a new design for ultra wide band pass filter (resonator BPF) with periodically loaded one-dimensional EBG to achieve the harmonic suppression. This basic EBG structure is developed with combination of a signal strip and ground plane in the slotted section. The resonator BPF is loaded with one EBG, two EBG and three EBGs to improve the stop-band rejection.

Design/methodology/approach

The proposed filter is with multi-stack EBG cell for achieving good pass band and stop bands performance. Circuit model is analyzed in Section 2. Section 3 discuses band pass filter loaded with one EBG. In Sections 4 and 5, filter with two and three EBG loaded resonators are discussed, respectively. Section 6 is concluded with comparison of simulation and measured results.

Findings

The stop-band rejection is 20 dB, 40 dB and 50 dB, respectively, in the frequency range of 6 GHz to 20 GHz. The simulation analysis is carried out with advanced system design software. To validate the simulation results, proposed structure is fabricated, and results are found to be in good agreement.

Originality/value

This paper accounts for designing resonator BPF, which has slow wave pass band and stop band characteristics. Second and third harmonics are suppressed using multi-stack EBG. Various stacks with basic designs are proposed and improved results have been demonstrated which is open for future research.

Details

Circuit World, vol. 48 no. 1
Type: Research Article
ISSN: 0305-6120

Keywords

Article
Publication date: 22 January 2024

Yang Yang, Yinghui Tian, Runyu Yang, Chunhui Zhang and Le Wang

The objective of this paper is to quantitatively assess shear band evolution by using two-dimensional discrete element method (DEM).

Abstract

Purpose

The objective of this paper is to quantitatively assess shear band evolution by using two-dimensional discrete element method (DEM).

Design/methodology/approach

The DEM model was first calibrated by retrospectively modelling existing triaxial tests. A series of DEM analyses was then conducted with the focus on the particle rotation during loading. An approach based on particle rotation was developed to precisely identify the shear band region from the surrounding. In this approach, a threshold rotation angle ω0 was defined to distinguish the potential particles inside and outside the shear band and an index g(ω0) was introduced to assess the discrepancy between the rotation response inside and outside shear band. The most distinct shear band region can be determined by the ω0 corresponding to the peak g(ω0). By using the proposed approach, the shear band development of two computational cases with different typical localised failure patterns were successfully examined by quantitatively measuring the inclination angle and thickness of shear band, as well as the microscopic quantities.

Findings

The results show that the shear band formation is stress-dependent, transiting from conjugated double shear bands to single shear band with confining stress increasing. The shear band evolution of two typical localised failure modes exhibits opposite trends with increasing strain level, both in inclination angle and thickness. Shear band featured a larger volumetric dilatancy and a lower coordination number than the surrounding. The shear band also significantly disturbs the induced anisotropy of soil.

Originality/value

This paper proposed an approach to quantitatively assess shear band evolution based on the result of two-dimensional DEM modelling.

Details

Engineering Computations, vol. 41 no. 1
Type: Research Article
ISSN: 0264-4401

Keywords

Book part
Publication date: 4 June 2019

Sam Vallen

Extreme metal originated in North America and Europe in the late-1980s, but Australia’s adoption of the form followed closely. One of the first Australian extreme metal (AEM) acts…

Abstract

Extreme metal originated in North America and Europe in the late-1980s, but Australia’s adoption of the form followed closely. One of the first Australian extreme metal (AEM) acts was Sadistik Exekution from Sydney, formed in 1985. Sadistik Exekution are notable for combining musical intensity with irreverent humour and parody. They introduced global extreme metal to the trope of the Australian larrikin: a once pejorative characterisation that has become a term of endearment in contemporary Australian culture, describing a defiant and jocular personality. This trope is evident in Sadistik Exekution’s work, but it has since proliferated more broadly throughout AEM, exemplified by more recent bands like Blood Duster and King Parrot. Their music, too, is inarguably intense and provocative, but is simultaneously mocking of the solemnity of its scene and lineage. This chapter will examine how bands like Sadistik Exekution, Blood Duster and King Parrot, through their public personas and musical and paramusical texts, have subverted extreme metal coding, thereby uncovering a uniquely Australian trajectory in extreme metal style and history.

Details

Australian Metal Music: Identities, Scenes, and Cultures
Type: Book
ISBN: 978-1-78769-167-4

Keywords

Book part
Publication date: 14 December 2023

José Ignacio Giménez-Nadal, José Alberto Molina and Almudena Sevilla

This chapter analyzes detailed 24-hour diary data from the United States to provide evidence on the relationship between workers' effort and well-being while at work. In doing so…

Abstract

This chapter analyzes detailed 24-hour diary data from the United States to provide evidence on the relationship between workers' effort and well-being while at work. In doing so, we first measure workers' effort in terms of the amount of on-the-job leisure, number of on-the-job leisure episodes, and the time working until consuming on-the-job leisure. Second, we link these three measures of worker effort to data on instantaneous well-being while at work. We find that the less time devoted to on-the-job leisure and the number of on-the-job leisure episodes, and the more time workers spend working until on-the-job-leisure, the higher the levels of stress during their work tasks. In analyzing workers' effort and stress during market work activities, we contribute to the scant literature on the determinants of worker happiness while at work, positing the consumption and the frequency of on-the-job leisure as affective factors.

Details

Time Use in Economics
Type: Book
ISBN: 978-1-83753-604-7

Keywords

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