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Abstract In this paper, two problems involving nonlinear time fractional hyperbolic partial differential equations (PDEs) and time fractional pseudo hyperbolic PDEs with nonlocal conditions are presented. Collocation technique for shifted Chebyshev of the second kind with residual power series algorithm (CTSCSK-RPSA) is the main method for solving these problems. Moreover, error analysis theory is provided in detail. Numerical solutions provided using CTSCSK-RPSA are compared with existing techniques in literature. CTSCSK-RPSA is accurate, simple and convenient method for obtaining solutions of linear and nonlinear physical and engineering problems.

Objetivo: El objetivo de nuestro estudio fue evaluar el efecto de diferentes dosis de ácido tranexámico intraarticular en la pérdida de sangre en cirugías de artroplastia total de rodilla y compararlo con el grupo control. Materiales y métodos: La pérdida de sangre estimada y la cantidad de sangre perdida por drenaje, así como las tasas de transfusión, se compararon entre los grupos en base a los parámetros sanguíneos preoperatorios y postoperatorios quirúrgicos para evaluar la efectividad de la dosis. Resultados: En nuestro estudio, todos los grupos de ácido tranexámico redujeron significativamente la pérdida de sangre estimada y la cantidad de sangre perdida por drenaje en comparación con el grupo control. No se encontró diferencia estadísticamente significativa entre el grupo control y el grupo que recibió 1 g de TXA en términos de tasas de transfusión (p = 0.062), y no se encontró diferencia estadísticamente significativa entre los grupos que recibieron 2 g y 3 g de TXA. Conclusión: El uso de 2 g de ácido tranexámico intraarticular es una dosis efectiva para controlar la pérdida de sangre en cirugías de artroplastia total de rodilla. Las dosis más bajas no tienen un efecto significativo en las tasas de transfusión.

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Abstract Recurrent nerve laryngeal schwannoma is a rare benign tumor that, in expert hands, can be treated by transoral CO2 laser surgery.

Helicobacter pylori (H. pylori) is a global health threat, and the World Health Organization has included H. pylori among 12 bacterial species that require high priority future strategies for the development of new antibiotics due mainly to its high rates of resistance. Metallic nanoparticles are known for their antimicrobial properties. The FDA (Food and Drug Administration) has approved zinc oxide nanoparticles (ZnONPs) as biocompatible antimicrobials. Green synthesis of ZnONPs was performed based on Oak galls extract (OGE) and was characterized by UV, IR, DLS, TEM, and SEM measurements. In addition, LC-MS/MS was used for the identification of OGE constituents. A checkerboard assay was used to evaluate the activity of synthesized Qi-ZnONPs and OGE against H. pylori, and their synergistic effects with amoxicillin were evaluated. LC-MS/MS analyses identified 20 compounds as major gallic acid conjugates. The ZnONPs had average particle sizes of 5.5 nm (DLS) and 7.99 nm (TEM). Both OGE and Qi-ZnONPs exhibited moderate activity against H. pylori. Amoxicillin and Qi-ZnONPs combinations (1:2 and 1:4 amoxicillin:/Qi-ZnONPs) significantly decreased the MIC90 by two-fold and four-fold, respectively, and FIC values for the combinations were more significant than with OGE alone. OGE is rich in phenolics. The synergism between Qi-ZnONPs and amoxicillin can provide an alternative safe agent of low cost to combat H. Pylori infections.

k-Mersenne and k-Mersenne-Lucas sedenions are specialised extensions of sedenions, a sixteen-dimensional algebraic structure. These variations introduce specific algebraic rules and properties derived from their connection to Mersenne and Lucas numbers. k-Mersenne sedenions are defined by their relationship to k-Mersenne numbers, while k-Mersenne-Lucas sedenions are associated with k-Mersenne-Lucas numbers. In this article firstly k-Mersenne and k-Mersenne-Lucas sedenions are defined. Then the algebraic properties of these sedenions such as norm, conjugate and inner product are examined. The Mersenne and Mersenne-Lucas recurrence relations, Binet's formulas, generating functions and finite sum formulas for these sedenions are derived. These sedenions also reveal interesting connections with established number theory identities such as Catalan's, Cassini's, D'Ocagne's and Vajda's identities, providing further depth to their significance within the mathematical theory and their potential applications across various scientific domains. [ABSTRACT FROM AUTHOR]

Room-temperature ball milling technique has been successfully employed to fabricate copper-zinc graphene nanocomposite by high-energy ball milling of elemental Cu, Zn, and graphene. Copper powder reinforced with 1-wt.% nanographene sheets were mechanically milled with 5, 10, 15, and 20 wt.% Zn powder. The ball-to-powder weight ratio was selected to be 10:1 with a 400-rpm milling speed. Hexane and methanol were used as a process control agent (PCA) during composite fabrication. The effect of PCA on the composite microstructure was studied. The obtained composites were compacted by a uniaxial press under 700 MPa. The compacted samples were sintered under a controlled atmosphere at 1023 K for 90 min. The microstructure, mechanical, and tribological properties of the prepared Cu-Zn GrNSs nanocomposites were studied. All results indicated that composites using hexane as PCA had a uniform microstructure with higher densities. The densities of sintered samples were decreased gradually by increasing the Zn percent. The obtained composite contained 10 wt.% Zn had a more homogeneous microstructure, low porosity, higher Vickers hardness, and compression strength, while the composite contained 15 wt.% Zn recorded the lowest wear rate. Both the electrical and thermal conductivities were decreased gradually by increasing the Zn content.

This work investigates the feasibility of using friction stir welding (FSW) process as a groove filling welding technique to weld duplex stainless steel (DSS) that is extensively used by petroleum service companies and marine industries. For the FSW experiments, three different groove geometries without root gap were designed and machined in a DSS plates 6.5 mm thick. FSW were carried out to produce butt-joints at a constant tool rotation rate of 300 rpm, traverse welding speed of 25 mm/min, and tilt angle of 3o using tungsten carbide (WC) tool. For comparison, the same DSS plates were welded using gas tungsten arc welding (GTAW). The produced joints were evaluated and characterized using radiographic inspection, optical microscopy, and hardness and tensile testing. Electron back scattering diffraction (EBSD) was used to examine the grain structure and phases before and after FSW. The initial results indicate that FSW were used successfully to weld DSS joints with different groove designs with defect-free joints produced using the 60° V-shape groove with a 2 mm root face without root gap. This friction stir welded (FSWed) joint was further investigated and compared with the GTAW joint. The FSWed joint microstructure mainly consists of α and γ with significant grain refining; the GTWA weld contains different austenitic-phase (γ) morphologies such as grain boundary austenite (GBA), intragranular austenite precipitates (IGA), and Widmanstätten austenite (WA) besides the ferrite phase (α) in the weld zone (WZ) due to the used high heat input and 2209 filler rod. The yield strength, ultimate tensile strength, and elongation of the FSWed joint are enhanced over the GTAW weldment by 21%, 41%, and 66% and over the BM by 65%, 33%, and 54%, respectively. EBSD investigation showed a significant grain refining after FSW with grain size average of 1.88 µm for austenite and 2.2 µm for ferrite.

Nagla Salem,1 Lamyaa Salem,2 Sally Saber,2 Ghada Ismail,2 Martin H Bluth1 1Department of Pathology, Wayne State University School of Medicine, Detroit, MI, USA; 2Department of Clinical and Chemical Pathology, Ain Shams University, Cairo, Egypt Abstract: Corynebacterium urealyticum is a Gram positive, slow-growing, lipophilic, multi-drug resistant, urease positive micro-organism with diphtheroid morphology. It has been reported as an opportunistic nosocomial pathogen and as the cause of a variety of diseases including but not limited to cystitis, pyelonephritis, and bacteremia among others. This review serves to describe C. urealyticum with respect to its history, identification, laboratory investigation, relationship to disease and treatment in order to allow increased familiarity with this organism in clinical disease. Keywords: Corynebacterium urealyticum, cystitis, pyelonephritis, bacteremia, micro-organisms

One hundred fifty three kidney transplant recipients whose grafts functioned for longer than one year were evaluated for evidence of post-transplant diabetes mellitus (PTDM). Twenty-six patients (17%) developed PTDM. Patients with PTDM were older than controls (mean age 49.4 vs 37.9 years). There was no demonstrable association between sex of patients and PTDM. The body mass index (BMI) was persistently higher in patients with PTDM compared to controls, although the difference did not amount to statistical significance. The association of PTDM with HLA-A28, A30 and B8 observed in other studies was not seen in our patients. Similarly, neither the positive association of HLA-DR3 and DR4, nor the negative association of HLA-B7 and DR2 seen in population-based studies of insulin dependent diabetes mellitus, were seen in our patients with PTDM. To our knowledge, this is the first report that has looked into the association of HLA antigens and PTDM in Saudi Arabia.