Synthesis and characterization of a new octafunctional epoxy resin (Octaglicydil tetra p-aminophenol of bisphenol A (Bis para phosphoric ester)). Viscosimetric study.

In this work, we synthesized a new octafunctional epoxy resin: Octaglicydil tetra p-aminophenol of bisphenol A (Bis para phosphoric ester) (OGTPAPBABPPE). This resin was synthesized in three steps. The first step is intended to condense the phosphorus trichloride and the bisphenol A; the second step was to introduce an aromatic spacer arm between the major epoxide functions and the nucleus of bisphenol A, by reacting p-aminophenol in the precursor dichloride phosphorus bisphenol A; in the third step, we functionalized the latter by the epichlorohydrin.The obtained resin was very viscous and brownish. The latter was characterized by infrared Fourier transform spectroscopy (FTIR), and its chemical structure was also confirmed by proton nuclear magnetic resonance of 1H, 13C atoms and phosphorus 31P (1H NMR, 13C NMR, 31P NMR). The study of viscosi-metric properties was carried out by the viscometer of Ubbelohd type

Philippines

This report discusses the extent of compliance of a higher education institution in Isabela, Philippines with the ISO 9001:2015 Quality Management System. An internal audit for clauses 4 to 9.1 of the QMS was conducted to determine the extent of QMS implementation and to identify areas of conformities, opportunities for improvement, and nonconformities. Out of the 215 findings, 177 are conformities (Cs); 25 are nonconformities (NCs); while 13 are opportunities for improvement (OFIs). The strengths of the organization include its understanding of its context, leadership of the top management, existence of planned actions to address risks and availability of almost all significant documents that support compliance and/or sustain the quality operations. Areas that need to be improved and complied include inadequate manpower for quality activities, unmet targets, and lack of control for externally provided products and services. Actions to address these findings are provided. Thus, the organization is highly recommended to carry out the corrective actions as soon as possible for continual improvement

College students’ problems and their link to academic performance: Basis for needs-driven student programs

Students are facing various challenges in life that may have adverse effects to their academic performance yet someschool programs are not student needs-driven. This descriptive research study discusses the problems experienced by the 350 students of a higher education institution in the Philippines with the hope to craft activities that are responsive to their needs and academic achievement. The data were collected through questionnaire and registration methods. Descriptive analysis shows that around 9 percent to 23 percent of the students experience problems in academic, social, family, emotional, personal, financialand spiritual aspects whose degree ranges from moderate extent to very great extent. The problems reflect teachers’ lapses in classroom management and pedagogy, and lack of activities that support students’ holistic development and effective learning habits. Linear regression analysis confirms that their problems explain significantly a variance that ranges from 19 percent to 36 percent in their academic performance. Hence, this research offers implications that can help address the adversaries of high academic achievement

Comparative study of inhibitory efficacy of methionine and its derivatives in acidic medium by mild steel

Corrosion inhibition effect of L-Methionine (MT1), L-Methionine sulfoxide (MT2) and L-Methionine sulfone (MT3) on mild steel corrosion in 1M HCl solution was studied by using weight loss, electrochemical polarization and electrochemical impedance spectroscopy (EIS) techniques. The experimental results showed that the inhibitory efficiency of the three aminoacids improves with the increase of concentration to reach the maximum value of 95.20% for MT1, 94.14% for MT2 and 88.92% for MT3 for a concentration of 10-3M, which translates that the surface covered by the inhibitor increases with the concentration. The effect of temperature on the corrosion rate was investigated and some thermodynamic parameters were calculated. Polarization studies show that three studied inhibitors suggested that three inhibitors control the anodic as well as cathodic reactions and act as mixed type in nature. The results show that MT1, MT2 and MT3 are good inhibitors, and the adsorption of each inhibitor on mild steel surface obeys Flory-Huggins and Langmuir, with a better fit of the Langmuir isotherm through mixed adsorption (physisorption as well as chemisorption) process. In addition, the quantum approach based on density functional theory (DFT), monte Carlo (MC) and molecular dynamics (MD) simulations was confirmed the reactivity of the studied compound towards the corrosion process

Plasma soluble P-selectin correlates with triglycerides and nitrite in overweight/obese patients with schizophrenia

Background: Soluble P-selectin (sP-selectin) is associated with risk factors for cardiovascular disease (CVD) but this association has not been evaluated in patients with schizophrenia. This study primarily evaluated the association of sP-selectin with plasma lipids and nitrite (NO2-) respectively in overweight/obese adults with schizophrenia

Coco Monoethanolamide Surfactant as a Sustainable Corrosion Inhibitor for Mild Steel: Theoretical and Experimental Investigations

Recent studies indicate that surfactants are a relatively new and effective class of corrosion inhibitors that almost entirely meet the criteria for a chemical to be used as an aqueous phase corrosion inhibitor. They possess the ideal hydrophilicity to hydrophobicity ratio, which is crucial for effective interfacial interactions. In this study, a coconut-based non-ionic surfactant, namely, coco monoethanolamide (CMEA), was investigated for corrosion inhibition behaviour against mild steel (MS) in 1 M HCl employing the experimental and computational techniques. The surface morphology was studied employing the scanning electron microscope (SEM), atomic force microscope (AFM), and contact measurements. The critical micelle concentration (CMC) was evaluated to be 0.556 mM and the surface tension corresponding to the CMC was 65.28 mN/m. CMEA manifests the best inhibition efficiency (η%) of 99.01% at 0.6163 mM (at 60 °C). CMEA performs as a mixed-type inhibitor and its adsorption at the MS/1 M HCl interface followed the Langmuir isotherm. The theoretical findings from density functional theory (DFT), Monte Carlo (MC), and molecular dynamics (MD) simulations accorded with the experimental findings. The MC simulation’s assessment of CMEA’s high adsorption energy (−185 Kcal/mol) proved that the CMEA efficiently and spontaneously adsorbs at the interface

Coco Monoethanolamide Surfactant as a Sustainable Corrosion Inhibitor for Mild Steel: Theoretical and Experimental Investigations

Recent studies indicate that surfactants are a relatively new and effective class of corrosion inhibitors that almost entirely meet the criteria for a chemical to be used as an aqueous phase corrosion inhibitor. They possess the ideal hydrophilicity to hydrophobicity ratio, which is crucial for effective interfacial interactions. In this study, a coconut-based non-ionic surfactant, namely, coco monoethanolamide (CMEA), was investigated for corrosion inhibition behaviour against mild steel (MS) in 1 M HCl employing the experimental and computational techniques. The surface morphology was studied employing the scanning electron microscope (SEM), atomic force microscope (AFM), and contact measurements. The critical micelle concentration (CMC) was evaluated to be 0.556 mM and the surface tension corresponding to the CMC was 65.28 mN/m. CMEA manifests the best inhibition efficiency (η%) of 99.01% at 0.6163 mM (at 60 °C). CMEA performs as a mixed-type inhibitor and its adsorption at the MS/1 M HCl interface followed the Langmuir isotherm. The theoretical findings from density functional theory (DFT), Monte Carlo (MC), and molecular dynamics (MD) simulations accorded with the experimental findings. The MC simulation’s assessment of CMEA’s high adsorption energy (−185 Kcal/mol) proved that the CMEA efficiently and spontaneously adsorbs at the interface