Recently, the extraction of Au(III) using series aliphatic ketones in hydrochloric acid media has been investigated detail. The present study describes behaviors a aromatic ketones, which never reported. Aromatic with shorter alkyl side chains showed higher extractability. rapid and capacity were comparable to industrial extractant dibutyl carbitol (DBC). except acetophenone, are less soluble w...

According to Witten [1], the conformal boundary condition of gravity, which specifies geometry and trace extrinsic curvature, is elliptic leads well-defined perturbation theory gravity about any classical solution. The was previously considered in [2, 3] context AdS/BCFT, wherein equation motion end-of-the-world derived emphasized. In this paper, we investigate further other consequences AdS/BC...

Abstract Background This study aims to evaluate the efficacy and safety of induction labour in mid-trimester pregnancy using a double-balloon catheter (DBC) within 12 h versus 12–24 h. Methods In this retrospective study, total 58 pregnant women at 14 + 0 weeks 27 6 gestation were enrolled as research subjects, they underwent intended termination our birth centre from January 1, 2017, June 31, ...

Modern communication signals have time-varying envelopes with significant peak-to-average ratios, resulting in low average efficiency when amplified by commonly used linear power amplifiers (PAs). For linear amplification with increased average efficiency, the Kahn envelope-elimination-and-restoration method uses a highly efficient saturated PA. In this paper, an 8.4-GHz class-F PA with 55% max...

This paper presents a complementary metal-oxidesemiconductor (CMOS) differential voltage-controlled oscillator (VCO) implemented with the push-push principle. The push-push VCO uses two frequency doublers stacked in series with an LC quadrature voltage-controlled oscillator (QVCO) to share the dc current with the QVCO for low power consumption. The proposed CMOS VCO has been implemented with th...

In this paper, design and realization of a 4.5-5.8 GHz, –Gm LC voltage controlled oscillator (VCO) for IEEE 802.11a standard is presented. The circuit is implemented with 0.35μm SiGe BiCMOS process that includes high-speed SiGe Heterojunction Bipolar Transistors (HBTs). A linear, 1300 MHz tuning range is measured with accumulation-mode varactors. Fundamental frequency output power changes betwe...

This work describes a two-stage CMOS Voltage Ring Oscillator (VCRO) using differential delay cells are analyzed. The main aim of the paper is to increase the tuning range of the circuit and obtain a good phase noise at the cost of design complexity and power consumption. Two-stage VCRO implemented in 90 nm Technology realizes a tuning range of 53.40% and a phase noise of -156.328 dBc/Hz for a p...

This paper proposes an RF signal generator using a time domain harmonic suppression technique based on Fourier series analysis. The circuit consists of four differential ring voltage control oscillators (VCO’s) with phase differences and the pulse signal summing circuit. By summing pulse signals from VCO’s with appropriate phase differences determined by Fourier series in time domain, the third...

This paper presents a new quadrature voltage-controlled oscillator (QVCO), which consists of two p-core Colpitts cross-coupled voltage-controlled oscillators (VCOs) with an LC ring resonator to provide the quadrature outputs. The proposed CMOS QVCO has been implemented with the TSMC 0.18μm CMOS technology and the die area is 0.478×0.82mm2. At the supply voltage of 1.5V, the total power consumpt...

Feature-oriented programming (FOP) is an extension of object-oriented programming to support software variability by refining existing classes and methods. In order to increase the reliability of all implemented program variants, we integrate design by contract (DbC) with FOP. DbC is an approach to build reliable object-oriented software by specifying methods with contracts. Contracts are annot...