Theory and Applications of Infinitesimal Dipole Models for Computational Electromagnetics

The recently introduced quantum particle swarm optimization (QPSO) algorithm is employed to find infinitesimal dipole models (IDM) for antennas with known near-fields (measured or computed). The IDM can predict accurately both the near-fields and the far- fields of the antenna. A theory is developed to explain the mechanism behind the IDM using the multipole expansion method. The IDM obtained from single frequency solutions is extrapolated over a frequency range around the design frequency. The method is demonstrated by analyzing conductingand dielectric- type antennas. A calibration procedure is proposed to systematically implement infinitesimal dipoles within existing MOM codes. The interaction of the IDM with passive and active objects is studied through several examples. The IDM proved to predict the interaction efficiently. A closed-form expression for the mutual admittance between similar or dissimilar antennas, with arbitrary orientations and/or locations, is derived using the reaction theorem

Efficacy of oral celecoxib and hyoscine butyl-bromide versus placebo during copper intrauterine device placement in women delivered only by elective cesarean section: a randomized controlled study

Objective: To compare the efficacy and tolerability of celecoxib to hyoscine butyl bromide (HBB) and placebo in reducing pain scores during placement of copper intrauterine devices (IUD) in parous women who have undergone elective cesarean section and who have had no previous vaginal deliveries. Methods: We conducted a randomized, double-blind, placebo-controlled trial at a tertiary University hospital from April 2018 to September 2018. The study included women who had never delivered vaginally and who desired copper IUD insertion. We randomized the study participants in a 1:1:1 ratio to celecoxib, HBB or placebo groups. They took the tablets orally two hours before IUD insertion. The study outcomes were the self-reported pain measurements, using a 10-cm Visual Analogue Scale (VAS), taken during tenaculum placement, sound insertion, IUD insertion and five minutes post-insertion, as well as an ease of insertion score. Results: The study included 105 women (n=35 in each group). The baseline characteristics were similar among all groups. The mean pain score in the celecoxib group was lower during IUD insertion than placebo (1.97 vs 4.34, p<0.001). Moreover, the ease of insertion score was significantly better with celecoxib [1.56 vs. 3.03, p< 0.001] than with placebo. Similarly, Women in the HBB group were more likely to report lower pain scores during IUD insertion (2.91 vs 4.34, p<0.001) and lower ease of insertion score [1.43 vs. 3.03, p< 0.001]. Conclusions: The use of celecoxib and HBB may both reduce the pain associated with copper IUD insertion among women with no previous vaginal delivery. However, celecoxib is better tolerated with fewer side effect

An Economic Analysis of Foreign Assets, Money Supply, and Inflation in Saudi Arabia, 1963-83

Until the discovery of oil in Saudi Arabia, the West knew very little about the economic aspects of the country. Since then, foreign assets have grown , and the balance of payment of Saudi Arabia have reflected an accumulation of continuously rising surpluses, particularly after 1973. Real income increased and consequentIy, supply and demand for money increased. During the period 1974-77, the Saudi economy experienced a high rate of inflation, but during the subsequent years (the late 1970s and the early 1980s) the Saudi inflation rate began declining. The main objective of the present study is to conduct an empirical investigation analyzing the interrelationships among foreign assets, money supply, and the domestic inflation in Saudi Arabia utilizing a modeI incorporating traded and non-traded goods. The theoretical model produces the final two equations where inflation generated in the non-traded goods sector and the overall domestic inflation represent the dependent variables, while the rate of change in the excess supply of money, world inflation, and the rate of change in last years inflation represent the explanatory variables for both dependent variabIes. The empirical analysis reveals no significant relationship between the behavior of the excess supply of money and the behavior of inflation in Saudi Arabian economy during the entire period of study (1963-83). It indicates that neither money supply nor foreign assets has played an active role in determining the behavior of domestic inflation in the Saudi Arabian economy. A strong relationship has been found between the inflationary expectations of the pubIic and the inflation generated in the non-traded goods sector. During the period (1963-72) imported inflation explained significantly the overall domestic inflation. But this is not so for the second period (1973-83) of study, even though inflation peaked during 1974-77. Furthermore, no structural shift in the economy occurred between these two sub-periods. The causality test conducted confirms the empirical results where no unidirectional causality existed between the overall domestic inflation rate and the excess supply of money. However, a positive causality has been found between the world inflation rate and the Saudi overalI domestic inflation rate. Another unidirectional causality from inflation generated in the nontradable sector to the overalI domestic inflation rate has been found. Finally, the implications of the results are discussed

About fuzzy fixed point theorem in the generalized fuzzy fractal space.

The Banach fixed point theorem has applications in several branches of science. Many authors prove this theorem in different types of fuzzy metric spaces and fuzzy fractal spaces. The aim of this paper is to prove the Banach fixed point theorem in a new generalized space called multi fuzzy fractal space

Efficiency analysis for public key systems based on fractal functions.

In the last decade, dynamical systems were utilized to develop cryptosystems, which ushered the era of continuous value cryptography that transformed the practical region from finite field to real numbers. Approach: Taking the security threats and privacy issues into consideration, fractals functions were incorporated into public-key cryptosystem due to their complicated mathematical structure and deterministic nature that meet the cryptographic requirements. In this study we propose a new public key cryptosystem based on Iterated Function Systems (IFS). Results: In the proposed protocol, the attractor of the IFS is used to obtain public key from private one, which is then used with the attractor again to encrypt and decrypt the messages. By exchanging the generated public keys using one of the well known key exchange protocols, both parties can calculate a unique shared key. This is used as a number of iteration to generate the fractal attractor and mask the Hutchinson operator, so that, the known attacks will not work anymore. The algorithm is implemented and compared to the classical one, to verify its efficiency and security. We conclude that public key systems based on IFS transformation perform more efficiently than RSA cryptosystems in terms of key size and key space

AMELIORATIVE EFFECT OF PHOENIX DACTYLIFERA ON ADVERSE EFFECTS OF LINEZOLID IN MALE ALBINO RATS

Objective: This study aimed to investigate the adverse effects of linezolid (LZD) on biochemical and hematological parameters and some organsincluding bone marrow, brain, and kidneys and to investigate the possibility of methanolic extract of Phoenix dactylifera (MEPD) to counteract theadverse effects of LZD.Methods: Forty-eight adult male albino rats were allocated into four equal groups (each of 12 animals). The first group received Tween 80 orally. Thesecond group received was given 0.5 ml of LZD suspension 4% in Tween 80 (100 mg/kg body weight) orally. The third group received the same doseof LZD suspension followed by 1 ml of MEPD orally. The rats in the last group were given 1 ml of MEPD (1000 mg/kg body weight) orally. Rats weresacrificed and blood samples were collected for hematological and biochemical study. Femur bones, brain, and kidneys were dissected and kept in ajar containing 10% formalin to perform the histopathological investigation.Results: The dose of LZD administered for 14 successive days induced a mild-to-moderate hematological abnormalities including decrease inhemoglobin content (7.88±0.18 g/L) on day-1 post-treatment. Significant increase in serum urea (59.75±0.85) and serum creatinine was observed(1.89±0.04). On day-14 post-treatment, LZD induced mild-to-moderate cellular abnormalities in bone marrow, brain, and kidneys. The concurrentoral administration of MEPD and LZD for the same period corrected the hematological, biochemical, and histopathological alterations induced by LZD. Conclusion: It was concluded that MEPD clearly ameliorated these damaging effects induced by LZD

IFS on the multi-fuzzy fractal space.

The IFS is a scheme for describing and manipulating complex fractal attractors using simple mathematical models. More precisely, the most popular “fractal –based” algorithms for both representation and compression of computer images have involved some implementation of the method of Iterated Function Systems (IFS) on complete metric spaces. In this paper a new generalized space called Multi-Fuzzy Fractal Space was constructed. On these spases a distance function is defined, and its completeness is proved. The completeness property of this space ensures the existence of a fixed-point theorem for the family of continuous mappings. This theorem is the fundamental result on which the IFS methods are based and the fractals are built. The defined mappings are proved to satisfy some generalizations of the contraction condition