Instantaneous Frequency Estimation in Unbalanced Systems Using Affine Differential Geometry

The paper discusses the relationships between electrical quantities, namely voltages and frequency, and affine differential geometry ones, namely affine arc length and curvature. Moreover, it establishes a link between frequency and time derivatives of voltage, through the utilization of affine differential geometry invariants. Based on this link, a new instantaneous frequency estimation formula is proposed, which is particularly suited for unbalanced systems. An application of the proposed formula to single-phase systems is also provided. Several numerical examples based on balanced, unbalanced, as well as single-phase systems illustrate the findings of the paper

The Impact of Intellectual Capital on Operational Performance in Jordanian Service Companies: Evidence from the Amman Stock Exchange

Purpose: This study seeks to determine how intellectual capital (IC) affects the operational effectiveness of service companies listed on the Jordanian Amman Stock Exchange (ASE).   Theoretical framework: The study is based on the concept of intellectual capital, which encompasses human capital, structural capital, and relational capital. These dimensions are examined to understand their influence on operational performance.   Design/Methodology/Approach: The study population consists of 40 service companies listed on the ASE, with a sample of 22 companies selected for analysis. Data collection relied on secondary sources, including reports and bulletins issued by the ASE between 2017 and 2021. Regression analysis is used in the study to look at the connections between several operational performance metrics and intellectual capital.   Findings: The findings reveal that human capital and structural capital have a significant positive impact on operational flexibility. Human capital and relational capital significantly influence cost efficiency. Structural capital, company size, and company age show significant effects on the inventory turnover rate. Human capital positively affects the asset turnover rate, while structural and relational capital do not exhibit significant effects.   Research, Practical & Social implications:  This study offers insightful information about the connection between intellectual property and operational effectiveness in service businesses listed on the ASE. The findings have practical implications for enhancing operational capabilities and efficiency within these organizations. Additionally, the study contributes to the existing knowledge on intellectual capital's impact on operational performance and fills a gap in the understanding of this relationship in the Jordanian context.   Originality/Value:  This study is one of the first to investigate how intellectual capital affects the performance of operational aspects in service businesses listed on the ASE in Jordan. By focusing on the unique characteristics of the Jordanian market, the study adds to the body of knowledge and advances knowledge of the function that intellectual capital plays in influencing operational success

Electrochemically Induced Dual Reactive Barriers for Transformation of TCE and Mixture of Contaminants in Groundwater

A novel reactive electrochemical flow system consisting of an iron anode and a porous cathode is proposed for the remediation of mixture of contaminants in groundwater. The system consists of a series of sequentially arranged electrodes, a perforated iron anode, a porous copper cathode followed by a mesh-type mixed metal oxide anode. The iron anode generates ferrous species and a chemically reducing environment, the porous cathode provides a reactive electrochemically reducing barrier, and the inert anode provides protons and oxygen to neutralize the system. The redox conditions of the electrolyte flowing through this system can be regulated by controlling the distribution of the electric current. Column experiments are conducted to evaluate the process and study the variables. The electrochemical reduction on a copper foam cathode produced an electrode-based reductive potential capable of reducing TCE and nitrate. Rational electrodes arrangement, longer residence time of electrolytes and higher surface area of the foam electrode improve the reductive transformation of TCE. More than 82.2% TCE removal efficiency is achieved for the case of low influent concentration (<7.5 mg/L) and high current (>45 mA). The ferrous species produced from the iron anode not only enhance the transformation of TCE on the cathode, but also facilitates transformation of other contaminants including dichromate, selenate and arsenite. Removal efficiencies greater than 80% are achieved for these contaminants in flowing contaminated water. The overall system, comprising the electrode-based and electrolyte-based barriers, can be engineered as a versatile and integrated remedial method for a relatively wide spectrum of contaminants and their mixtures