In this study, polyvinylpyrrolidone (PVP) fibers were fabricated using electrospinning, and their properties were enhanced through dual doping with zinc (Zn) and tin (Sn) ions at different Zn:Sn mixing ratios. The structural, optical, and electrical characteristics of the fibers were investigated to evaluate their potential for photodetector applications. The X-ray diffraction (XRD) analysis of pure PVP fibers indicates an amorphous nature, whereas two broad diffraction peaks emerge after mixing with ions, which is caused by the rearrangement of PVP chains due to their interactions with the added ions. Field emission scanning electron microscopy (FESEM) images show a significant reduction in fiber diameters and an increase in the density

A comprehensive theoretical framework is developed to evaluate the anisotropic coherence length in high-temperature superconductors based on the fluctuation-induced conductivity approach. The theoretical model is formulated using well-established expressions derived from the anistropic Ginzburg-Landau theory, incorporating both Aslamazov-Larkin and Maki-Thompson contributions. Numerical calculations are carried out for two representative superconducting systems, namely nano-(Co_0.5Zn_0.5Fe₂O₄)_x/(Cu,Tl)-1223 and Cd-doped (Cu,Tl)-1234 phase, which exhibit distinct dimensional characteristics. The reduced paraconductivity is analyzed as a function of reduced temperature, and the extracted

Lead and concrete blocks are well known for shielding against ionizing radiation, but their use is limited due to their high density, toxicity, and environmental concerns. This study investigates the potential of Bambusa vulgaris (bamboo powder)-based mortar composites as an alternative gamma-ray radiation-shielding material. Different blends of bamboo powder, sand, and cement were chemically treated to produce binary and ternary composites. The elemental composition of Bambusa vulgaris was determined using X-ray fluorescence (XRF), while the radiation attenuation coefficients of the samples against rays were determined using a NaI(Tl) scintillation detector and Cs-137 gamma source (662 keV). Key shielding parameters, including Linear an

This work presents the fabrication of highly efficient gas sensors based on silver oxide (AgO)- doped cadmium sulfide (CdS) nanostructures deposited on porous silicon (PS) substrates using pulsed laser deposition (PLD). Three doping concentrations of AgO (5, 10, and 15%) were investigated to evaluate their influence on the structural, optical, and gas sensing properties of CdS. The prepared films were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), UV–Vis spectroscopy, and Fourier transform infrared spectroscopy (FTIR). The XRD results confirmed enhanced crystallinity with increasing AgO concentrations, while FESEM and AFM analyses revealed a nanostructure

The primary objective of this study is to investigate the effects of thermal curing and fly ash incorporation on the mechanical and physical properties of reactive powder concrete (RPC) to develop a more sustainable RPC mixture with partial replacement of ordinary Portland cement (OPC) by fly ash. Four mixes were prepared: a reference mix (R) and mixes with fly ash replacement levels of 10%, 20%, and 30% (RF10, RF20, and RF30). Each mixture was cast and tested in three specimens for each age of testing. The specimens were thermally cured at 70°C for 5 hours per day for a total of 3 days, followed by water curing until the testing age. The experiments showed that adding 20% fly ash improved the overall p

The effect of active-layer thickness on PM6:Y6 organic solar cells' performance was studied using several characterization techniques, such as current density vs. voltage (J-V), capacitance vs. voltage (C-V), charge vs. voltage (Q-V), charge extraction by linearly increasing voltage (CELIV), and sun-dependent. Results show that increasing thickness increased light absorption and therefore short-circuit current density (J_SC), but excessive thickness caused transport limitations and higher recombination, resulting in reduced fill factor (FF). On the other hand, open-circuit voltage (V_OC) remained weakly dependent on thickness variation. As a result, power conversion efficiency (PCE) has initially increased and then de

This work presents a numerical study of a multilayer optical biosensor based on distributed Bragg reflectors (DBRs) with a blood-filled cavity. The Transfer Matrix Method (TMM) was employed and simulated in MATLAB to analyze the resonant behavior over the wavelength range 780-810 nm. The analysis also considered the effects of temperature variation from 15 to 40 °C and changes in the silicon layer thickness from 20 to 200 nm. The results revealed a blue shift in the resonant wavelengths of the defect mode due to temperature variation, leading to a negative thermal sensitivity whose magnitude depends nonlinearly on the silicon layer thickness. In addition, electric field intensity distributions at resonance revealed stronger localization

The influence of SDBS, SLS, SLES, and SS as drag reducing agents on flow of Iraqi crude oil in pipelines was investigated in the present work. The effect of additive type, additive concentration, pipe diameter, solution flow rate, and the presence of elbows on the percentage of drag reduction (%Dr) and the amount of flow increases (%FI) was addressed. The maximum drag reduction was 55% obtained at 250 ppm SDBS surfactant flowing in straight pipes of 0.0508 m I.D. The dimensional analysis was used for grouping the significant quantities into dimensionless groups to reduce the number of variables. The results showed good agreement between the observed drag reduction percent values and the predicted ones with high value of the co

Several parameters affect the properties of Portland cement and one of these parameters is the cooling rate of the clinker. If the effectiveness of the cooling method of the clinker increases, a good enhancement in the properties of Portland cement will be found. Depending on the new cooling method suggestion by Nasr et. al. [20], the counter pattern of air clinker flow was studied using (FLUENT 6.3.26). The dimensions of the cooling room in grate cooler, the constant mass flow rate of both clinker and air, different height ratios, and different clinker porosity were considered in this numerical work. The results show that the heat transfers in the first half of the cooling room (0 < X < 0.9 m) is larger than that in the secon

Corrosion resistance of metals is one of the most important topics for researchers. In this work, epoxy-TiO2 nanocomposite has been developed for protection of 6061AL alloy. The dip-coating technique used to deposit the coating on 6061 Al alloy substrate. Different concentrations of TiO2 NPs (1,3,5 )Wt% have been used to study the corrosion behavior in 3.5% NaCl medium. Also, 200,150 and 100 mm/min dipping speeds have been employed for 1%wt TiO2 to show their effects on coating layer and corrosion rate. Characterization of coated surfaces were investigated by AFM, FESEM andEDS,while theelectrochemical measurementswas using to evaluate protective nature of the coating. The results have shown that the corrosion rate has decreased with

ZnTe possesses the proper optoelectronic properties as a candidate for device development. The structure and optical properties of ZnTe semiconductor thin films of 500 nm were studied using thermal evaporation technique. The influence of annealing temperatures on ZnTe thin films in the range ( R.T - 473 K). XRD and surface morphological analyses are used to examine the films. The ZnTe films are comparatively polycrystalline and cubic in phase, according to the XRD analysis. with a lattice constant of 0.61 nm upon an (111) orientation. The intensities of all the peaks rapidly increase though they show the same tendencies; it shows the crystallinity of the films becomes higher crystal size diameters (from 8.41 to 12.18nm) both increas