Applied Sciences Research Periodicals

Asymptotics and Fourier Expansions of the Sequence of Linear Factor of Polynomials Orthogonal with Gegenbauer-Sobolev Inner Product

Abdalgadir Albushra, Musa Siddig, Amani Elseid, Abdelrehaman Mohamsd — Thu, 06 Nov 2025 00:00:00 +0000

For monic polynomials orthogonal to the non-discrete Sobolev inner product, let show the sequence of quadratic factors. . Where with . Both Sobolev norms of and a Mehler-Heine type formula with a strong asymptotic on are obtained. Additionally, we look for the necessary conditions for norm convergence and the reasons for the norm convergence of a Fourier expansion, specifically with regard to the Sobolev orthogonal polynomials.

Intrinsic Fermi Energy Level in Materials Having a Bandgap

Ravi Kumar Chanana — Thu, 06 Nov 2025 00:00:00 +0000

This brief review mainly highlights the applications of the determined intrinsic Fermi energy level in semiconductors and insulator materials. The electrical properties of a Metal-Oxide-Semiconductor (MOS) device designed on any parabolic semiconductor and having SiO₂ as the oxide dielectric, can be calculated theoretically once the intrinsic Fermi energy levels in the semiconductor and the oxide are known. Also, Hetero junction devices can be better designed with this known intrinsic Fermi energy level in materials.

Clinical Evaluation of a Customized POCT cup for Detecting 16 Psychoactive Substances in Urine at Abu Dhabi’s National Rehabilitation Center Laboratories

Sun, 09 Nov 2025 00:00:00 +0000

Point-of-care testing (POCT) provides rapid, cost-effective, and patient-centric solutions for the detection of drugs of abuse (DOA), particularly in rehabilitation environments. While traditional laboratory-based toxicology screening is precise, it is often associated with delays that hinder timely clinical decision-making. This study aimed to assess the performance and reliability of a custom-developed POCT cup for the detection of 16 psychoactive substances in urine samples, using immunoassay and liquid chromatography-tandem mass spectrometry (LC-MS/MS) as reference methods. A total of 504 urine samples were analyzed with the newly developed POCT device, followed by immunoassay screening and confirmatory LC-MS/MS analysis. The substances tested included amphetamines, benzodiazepines, cocaine, cannabis, opioids, MDMA, among others. The POCT device demonstrated an average concordance rate of 98.4% with confirmatory LC-MS/MS results (range 91-100%). High agreement was observed for cocaine, barbiturates, and opiates, while MDMA exhibited the highest rate of misidentification. Immunoassay screening was effective for preliminary detection but showed limitations in specificity. The customized POCT device demonstrated high reliability in clinical settings, presenting a valuable tool for frontline screening. However, confirmatory LC-MS/MS testing remains critical for ensuring diagnostic accuracy, particularly for substances with a propensity for cross-reactivity or false positives.