Non-Radiative Energy Transfer Mechanism and Optoelectronic Properties of (PFO/TiO2)/Fluorol 7GA Hybrid Thin Films

Energy transfer between poly (9,9'-di-n-octylfluorenyl-2,7-diyl) (PFO)/TiO2 nanoparticles (NPs), as a donor, and Fluorol 7GA as an acceptor has been studied. The energy transfer parameters were calculated by using mathematical models. The dominant mechanism responsible for the energy transfer between the donor and acceptor molecules was Förster-type, as evidenced by large values of quenching rate constant and critical distance of energy transfer as well as fluorescence quantum yield and excited state lifetime of donor in the presence of acceptor. Moreover, these composites, which were used as an emissive layer in organic light emitting diodes, were investigated in terms of current–voltage and electroluminescence spectra

A Case of Gastroesophageal Cancer after Laparoscopic Sleeve Gastrectomy

Gastric cancer has been reported in relatively few cases after sleeve gastrectomy, which has become a common bariatric procedure. In this paper, we present a 58-year-old woman diagnosed with gastric cancer by esophagogastroduodenoscopy (EGD) 4 years after sleeve gastrectomy. For that, she underwent distal esophagectomy and total gastrectomy with Roux-en-Y esophagojejunostomy. Preoperative endoscopy is recommended before planning surgery in patients with gastroesophageal reflux symptoms. In addition, annual EGD should be considered after sleeve gastrectomy in patients with risk factors for gastric cancer

Non-Radiative Energy Transfer Mechanism and Optoelectronic Properties of (PFO/TiO2)/Fluorol 7GA Hybrid Thin Films

Energy transfer between poly (9,9'-di-n-octylfluorenyl-2,7-diyl) (PFO)/TiO2 nanoparticles (NPs), as a donor, and Fluorol 7GA as an acceptor has been studied. The energy transfer parameters were calculated by using mathematical models. The dominant mechanism responsible for the energy transfer between the donor and acceptor molecules was Förster-type, as evidenced by large values of quenching rate constant and critical distance of energy transfer as well as fluorescence quantum yield and excited state lifetime of donor in the presence of acceptor. Moreover, these composites, which were used as an emissive layer in organic light emitting diodes, were investigated in terms of current–voltage and electroluminescence spectra

Factors influencing the adoption of social media marketing in small and medium-sized enterprises during the COVID-19 pandemic in Saudi Arabia : a thesis presented in partial fulfilment of the requirements for the degree of Master in Business Studies at Massey University, Auckland, New Zealand

The COVID-19 outbreak led to a global economic slowdown that affected many countries including Saudi Arabia where trade, investment, employment, and travel have all been impacted by the lockdown, especially on small and medium-sized enterprises (SMEs). The main purpose of the current study is to examine the factors that influence the adoption and use of social media marketing (SMM) in SMEs during the lockdown in Saudi Arabia. This study has used a combined developed model from the Technology Acceptance Model (TAM) and Unified Theory of Acceptance and Use of Technology (UTAUT2) to examine whether SMEs in Saudi Arabia accept and use SMM effectively in the case such as COVID-19 pandemic, and to test its impact on improving the business performance through attracting new customers, sales, improved communication with customers, identifying customers' needs, and utilizing employees' creativity. This model succeeded to explain the Impact On Business (IOB) to a degree of 81%, since the coefficient of determination (R²) is 0.81. This study used a quantitative method by applying the Structural Equation Modelling (SEM) technique to validate the conceptual model. The data was collected by using an online questionnaire of 146 participants from small and medium-sized enterprises. The results highlight that perceived usefulness (PEU), low cost (LCOS), and compatibility (COM) had a significant positive impact on SMEs to adopt and use SMM. The facilitating conditions and perceived ease of use had a non-significant impact on the adoption and use of SMM by SMEs. This study also found that small enterprises have been affected by the factors more than medium-sized ones. Another finding is that enterprises that were forced to close were more significantly affected by the factors (Low Cost and Compatibility) than the non-closed ones during the first lockdown starting from March 2020. In the same context, Facilitating Conditions (FCO) was not significant as 63 % of the participated enterprises were closed during the lockdown and could not use their infrastructure

COMPLEX INTUITIONISTIC FUZZY DOMBI PRIORITIZED AGGREGATION OPERATORS AND THEIR APPLICATION FOR RESILIENT GREEN SUPPLIER SELECTION

One of the main problems faced by resilient supply chain management is how to solve the problem of supplier selection, which is a typical multi-attribute decision-making (MADM) problem. Given the complexity of the current decision-making environment, the primary influence of this paper is to propose the theory of Dombi operational laws based on complex intuitionistic fuzzy (CIF) information. Moreover, we examined the theory of CIF Dombi prioritized averaging (CIFDPA) and CIF weighted Dombi prioritized averaging (CIFWDPA), where these operators are the modified version of the prioritized aggregation operators and Dombi aggregation operators for fuzzy, intuitionistic fuzzy, complex fuzzy and complex intuitionistic fuzzy information. Some reliable properties for the above operators are also established. Furthermore, to state the art of the proposed operators, an application example in the presence of the invented operators is evaluated for managing resilient green supplier selection problems. Finally, through comparative analysis with mainstream technologies, we provide some mechanism explanations for the proposed method to show the supremacy and worth of the invented theory

The Level of Participation of Parents of Students with Learning Disabilities in the Preparation of the Individual Educational Plan in Al-Qassim Region

The study aimed to identify the level of participation of parents of students with learning disabilities in the preparation of the individual educational plan and identify obstacles of their participation from the perspective of teachers of learning disabilities. The sample consisted of 59 elementary school teachers in the region of Qassim. The study data were collected by a questionnaire prepared by the researchers. The study used the descriptive approach. The results showed that the level of participation of parents was at medium, as well as the high degree of obstacles that prevent their participation in the preparation of the individual educational plan. The results showed that there were no statistically significant differences in the level of participation and its obstacles due to the variable years of experience. It also revealed that there were no statistically significant differences in the level of participation due to the education level variable. There were statistically significant differences in participation obstacles due to the variable of scientific qualification between the sample mean and the virtual mean of the study population

A framework for pronunciation error detection and correction for non-native Arab speakers of English language

This paper examines speakers’ systematic errors while speaking English as a foreign language (EFL) among students in Arab countries with the purpose of automatically recognizing and correcting mispronunciations using speech recognition, phonological features, and machine learning. Accordingly, three main steps are implemented towards this purpose: identifying the most frequently wrongly pronounced phonemes by Arab students, analyzing the systematic errors these students make in doing so, and developing a framework that can aid the detection and correction of these pronunciation errors. The proposed automatic detection and correction framework used the collected and labeled data to construct a customized acoustic model to identify and correct incorrect phonemes. Based on the trained data, the language model is then used to recognize the words. The final step includes construction samples of both correct and incorrect pronunciation in the phonemes model and then using machine learning to identify and correct the errors. The results showed that one of the main causes of such errors was the confusion that leads to wrongly utilizing a given sound in place of another. The automatic framework identified and corrected 98.2% of the errors committed by the students using a decision tree classifier. The decision tree classifier achieved the best recognition results compared to the five classifiers used for this purpose

Sufficiency and Efficiency of Field Training for Radiology Students During Internship Experience in Najran University, Saudi Arabia

Purpose: The study was design to evaluate the effectiveness and adequacy of the internship period employing quantitative study descriptive survey approach.   Theoretical framework: Internship is requirement of every student of radiology program of Radiological Sciences patch for the award of bachelor's degree at Najran University, Saudi Arabia. The competency level would demonstrate influence the sufficiency and efficiency of clinical training during internship period which represent six months after completing nine levels of radiology program.   Design\Methodology\Approach: The survey was distributed to the tow levels of the last year of radiological sciences which composed of 81 male and female students which gathered seventy-seven (77) participants. Data collected through a questionnaire and summarized as percentages, frequencies, means and standard deviations using SPSS version 20.0.   Findings: The study revealed un adequacy of the internship period and showed low efficiency due to its short duration.   Research, Practical, Social Implication:The research construct and variables are identified the effectiveness and adequacy of the internship period.this  study will be the modele of internship with a new qualitative change related to a period of time acceptable to students, similar to other universities.   Originality/Value: The originality and value in this study are the framework conceptance and questionnaire that prepared and proved for evaluating the effectiveness and adequacy of the internship period for student of radiology program.   Conclusion: In general internship period must be efficient and adequate to enhance sufficiency and efficiency experience by intern trainees

Synthesis, characterization, antimicrobial activity and molecular docking studies of combined pyrazol-barbituric acid pharmacophores

Purpose: To synthesize, and determine the antibacterial activity and binding mode of new pyrazolbarbituric acid derivatives in a search for new antimicrobial agents.Methods: One-pot multi-component reaction of aldehyde derivatives, barbituric acid and 3-methyl-1- phenyl-1H-pyrazol-5(4H)-one in the presence of NHEt2 to afford Michael adduct was carried out. The reaction was carried out in water and afforded new heterocycles in a one-step fashion, with expedient work-up and high yield without extraction and purification steps. The synthesized compounds were evaluated for antimicrobial activity using agar disc diffusion. Molecular docking approach via MOE-Dock program was applied to predict the binding interactions of some of the new pyrazol-barbituric acid derivatives against six different target proteins downloaded from Protein Data Bank.Results: A series of pyrazole-barbituric acid derivatives were successfully synthesized and characterized. The synthesized compounds showed moderate to very good antibacterial activity against S. aureus ATCC 29213 and E. faecalis ATCC29212, as well as also antifungal activity against Candida albicans ATCC 10400Conclusion: A series of pyrazole-barbituric acid derivatives has been synthesized and some of them display antimicrobial activities.Keywords: Pyrazole, Barbituric acid, Pyrazole-barbituric acid derivatives, Antimicrobial activity, Molecular dockin