University of Thi-Qar (Arabic: جامعة ذي قار) is an Iraqi university located in Nasiriyah, Iraq. It was established in 2000. Originally, the university was a branch of the University of Basrah, and the branch was established in 1992. Its first graduating class was in 1996. In 2000, the branch became independent of Basrah University and University of Thi-Qar was founded.
Four β-keto ester derivatives containing 1,2,4-triazole (A7 and A8) or 1,3,4-oxadiazole (A13 and A14) thioether units were synthesized by S-alkylation of the corresponding thiol/thione precursors with ethyl 4-chloro-3-oxobutanoate in ethanol using sodium acetate as a stoichiometric basic additive. The proposed structures are supported by FT-IR, 1H NMR, and 13C NMR data, including disappearance of the precursor S–H resonances and appearance of signals attributable to the β-keto ester fragment. Solvent-dependent keto–enol behavior was examined qualitatively by 1H NMR spectroscopy in DMSO-d6 and CDCl3 at 298 K. Only keto-form diagnostic resonances were resolved in DMSO-d6. In CDCl₃, A7 displayed signals of both keto and enol species; A8 and A14 displayed resolved enol-form signals without a resolved keto methylene signal; and A13 retained a resolved keto methylene signal without detectable enol resonances. UV/Vis spectra showed intense absorptions mainly in the ultraviolet region and weaker solvent- and concentration-sensitive features at longer wavelengths. Cyclic voltammetry in DMF containing 0.10 M tetrabutylammonium perchlorate revealed multiple cathodic processes that were predominantly irreversible on the experimental time scale. Because the Ag quasi-reference electrode was not calibrated against an internal ferrocene standard, the electrochemical results are interpreted comparatively within this data set rather than as absolute formal potentials. The combined results demonstrate qualitative relationships among heterocycle identity, methoxy substitution, solvent-dependent tautomeric signatures, and electrochemical response.
Wire arc additive manufacturing (WAAM) offers significant advantages for the fabrication of stainless-steel components; yet, the optimization of process parameters remains critical for achieving desirable geometric and microstructural properties. This study investigates the effects of travel speed, welding current, and wire feed ratio on the layer geometry and microstructure of SS309L stainless steel produced via robotic double-wire MIG welding. Using a Taguchi L9 orthogonal array, the main and interaction effects of these parameters were systematically evaluated. Analysis of variance revealed that wire feed ratio is the most influential factor, contributing (43.6
Traditional Iraqi medicinal herbs, utilized for therapeutic purposes, are regarded as valuable suppliers of numerous vital elements that play a significant part in various metabolic functions. The Instrumental Scanning Electron Microscope/Energy Dispersive X-ray Spectroscopy (SEM/EDX) has been utilized to identify the elements C, O, Mg, Cl, Ca, K, P, S, Na, Cu, Cr, Ni, Fe, Co, Si, V, Ti, U, Al, Pt, and Pd in 25 medicinal herbs frequently employed in Iraqi households and in the synthesis of pharmaceuticals for the treatment of various conditions. The SEM-MED reveals that the two elements carbon C and oxygen O are detected in all the herbs and the carbon C is the dominant element detected at high concentration followed by oxygen O, chromium Cr, and magnesium Mg elements.
Piezo-assisted photocatalysis has developed as an integrated process for organic pollutants degradation by supporting the photocarriers separation through the piezoelectric polarization effect. Herein, we constructed SrTiO3-decorated Sr-doped g-C3N4 (SrTO/SrCN) heterojunction catalysts with different SrTO weight ratios (from 5 to 50 wt%) to obtain effective piezo/photo-catalysts for decomposition of tetracycline hydrochloride antibiotic (TCH) under visible light and ultrasonic circumstances. The band gap reduction of SrCN resulting from Sr doping, the fabrication of the Z-system heterojunction between SrTO and SrCN, which successfully reduces the charge recombination of photocarriers, and the piezoelectric polarization effects of SrTO contributed to the enhancement of the piezo/photo-catalytic TCH degradation. Noticeably, the degradation reached 98.3 in 50 min over 30 wt%-SrTO/SrCN heterojunction catalyst, which was higher than that of the pur SrTO, CN, and SrCN samples. Furthermore, The TOC removal of TCH reached 83.5 %, indicating outstanding mineralization performance of SrTO/SrCN sample. Through the trapping study, O-2(-) and (OH)-O-center dot species played a pivotal role in the TCH decomposition process, which supports the proposed mechanism in this work. Besides, excellent durability of SrTO/ SrCN heterojunction piezo/photo-catalysts has been detected, in which 92.7 % TCH decomposition was still obtained after five recycled processes.
This study thoroughly investigates the adsorption behavior of various gases (including NO2, H2S, SO2, CO2, and CO) on Janus ZrSSe monolayer enhanced with transition metal oxides (NiO, TiO2, and ZnO) by using density functional theory (DFT). Particular attention is given to determining the nature of the interaction, whether chemical or physical, analyzing charge transfer processes, and the resulting modifications in the electronic properties of the systems after gas adsorption. The findings demonstrate that specific configurations, such as NO2/TiO2-ZrSSe, NO2/NiO-ZrSSe, and NO2/ZnO-ZrSSe, exhibit strong interactions with the NO2 gas molecule. The adsorption energies were revealed to be -3.707 eV, -4.209 eV, and -5.116 eV, respectively, with NO2 exhibiting the most favorable adsorption energy, indicating superior selectivity for NO2. Moreover, the charge transfer analysis reveals significant alterations in electronic distribution, which are enhanced both when gas molecules adsorb onto these materials. Their unique sensitivity and selectivity result from changes in electrical conductivity. This allows these materials to detect particular gases. Additionally, the substrate's temperature can be changed to regulate the release of the adsorbed gases efficiently. These results underscore the promise of oxide-modified ZrSSe structures as advanced candidates for developing high-performance gas sensors.
