4,567 research outputs found
Grammatical errors in Saudi students' writing : a minimalist approach / Mohammad Abdul Aziz Omar Al-Khatib
No full textThis empirical study is an analysis of EFL writing by third year university students. There
are three aims of the current work; (1) to find out the kinds of grammatical errors Saudi
students make in their writings; (2) to explicate ungrammaticality of the students' errors
employing the Minimalist Program; (3) to evaluate the contributing factors that cause
grammatical errors. Data was derived from compositions written by a stratified random
sample of twenty junior students majoring in English at The Faculty of Arts and
Humanities in King Abdul Aziz University, Jeddah, Saudi Arabia. Actually, these
compositions are an assignment given by their lecturer as a kind of critical writing about
the play Trifles by Glaspell. The study is qualitative in nature as it primarily focuses on
analyzing the types of grammatical errors no matter how frequent they occur. Findings
revealed that most of the grammatical errors are in sentence structure, prepositions, subjectverb agreement and wrong use of words. The results demonstrated that Saudi juniors do not
completely fulfill the requirement for lexical information of an English sentence in the
sense they still do not fully understand how many arguments a verb must have, what
features a verb may have in terms of transitivity, intransitivity or even what kind of phrase
that a verb subcategorizes for. With regard to factors causing ungrammaticality, intralanguage errors were the majority of the grammatical errors in the writings whereas
mother-tongue interference has no great influence on the students' writing. Saudi EFL
students seem to over-generalize English rules to other positions in sentence structure.
Also, they are not aware, sometimes, of the exceptions or restrictions of a rule which results
in ill-formed structure. Findings of the study and its pedagogical implications are discussed
in detail in chapter five
sj-xlsx-1-ltj-10.1177_02655322211057040 – Supplemental material for Critical language assessment literacy of EFL teachers: Scale construction and validation
No full textSupplemental material, sj-xlsx-1-ltj-10.1177_02655322211057040 for Critical language assessment literacy of EFL teachers: Scale construction and validation by Zia Tajeddin, Mohammad Khatib and Mohsen Mahdavi in Language Testing</p
sj-doc-2-ltj-10.1177_02655322211057040 – Supplemental material for Critical language assessment literacy of EFL teachers: Scale construction and validation
No full textSupplemental material, sj-doc-2-ltj-10.1177_02655322211057040 for Critical language assessment literacy of EFL teachers: Scale construction and validation by Zia Tajeddin, Mohammad Khatib and Mohsen Mahdavi in Language Testing</p
Innovative SPE-LC-MS/MS technique for the assessment of 63 pharmaceuticals and the detection of antibiotic-resistant-bacteria: A case study natural water sources in Lebanon
No full textA powerful analytical method for simultaneous determination of 63 pharmaceuticals and some metabolites in aqueous samples has been developed. The list of compounds amenable to the methods includes different therapeutic classes belonging to antibiotics, stimulants, antidepressants, mucolytics, and antiparasites. The method involves concentration and clean up by an offline solid phase extraction SPE followed by liquid chromatography coupled to tandem mass spectrometry (LC-ESI-MS/MS). The recovery of the target compounds from water samples was most efficient on Waters Oasis HLB SPE cartridge, while acetonitrile/water (60/40) was shown to be the most suitable solvent for desorbing the compounds from SPE. In addition, acidification of samples prior to SPE was optimized to enhance the recovery of the compounds. In terms of method validation, the recoveries of analytes ranged from 68% to 134%. Repeatability and intermediate precision were 10,000 ng L− 1 and 2000 ng L− 1, respectively. Moreover, bacterial analysis showed that the samples were contaminated by Escherichia coli (23%), intestinal Enterococcus (48%) and Pseudomonas aeruginosa (27%). Therefore, in order to evaluate if a correlation exists between finding antibiotics in water samples and the development of resistant-bacteria, an antimicrobial susceptibility test was conducted to the identified isolates using disk diffusion method. Multiple-antibiotic-resistant strains in both intestinal Enterococcus and E. coli were evident in many water samples, while P. aeruginosa was resistant to only one studied antibiotic
A Navigation and Control System for a Robot in Indoor/Outdoor Environments
No full textA Master of Science thesis in Mechatronics Engineering by Ehab Al Khatib entitled, "A Navigation and Control System for a Robot in Indoor/Outdoor Environments," submitted in May 2016. Thesis advisor is Dr. Mohammad A. Jaradat and thesis co-advisor is Dr. Mamoun Abdel-Hafez. Soft and hard copy available.This thesis presents an approach to solving the global navigation problem of wheeled mobile robots in indoor and outdoor environments. The presented solutions are based on probabilistic approaches. In outdoor environment, the Extended Kalman Filter (EKF) is used to estimate the robot position and orientation based on wheel encoders, inertial measurement unit (IMU) and Global Positioning System (GPS) utilizing three different approaches. The three approaches are tested in a simulation environment, and one of them is verified in an experimental test. For indoor environment, where GPS signals are blocked, three different algorithms, which are based on Microsoft Kinect depth stream are proposed and tested in occupancy grid and feature-based maps both in simulation and experimental environments. First, the Particle Filter (PF) uses the raw depth data to localize the robot inside a pre-defined map. Second, EKF indoor localization based on landmarks extracted from the depth measurements, is utilized. In case the robot enters an unknown map, the third algorithm is used to estimate the robot pose as well as the landmark position based on EKF. This is known as simultaneous localization and mapping (EKF SLAM). Subsequently, an input-output state feedback linearization (I-O SFL) method is used to control the robot along the desired robot trajectory. Finally, a hybrid navigation system for indoor and outdoor environments is proposed and tested in both simulation and experimental environments. Simulation and experimental testing is performed to validate the proposed methods. It is observed that the EKF based techniques show better results than PF technique both in indoor and outdoor environments.College of EngineeringMultidisciplinary ProgramsMaster of Science in Mechatronics Engineering (MSMTR
Biomimetic PLGA 3D Scaffold Potentiate Amniotic Epithelial Stem Cells Biological Capability for Tendon Tissue Engineering Applications
No full textINTRODUCTION: Tendon tissue engineering represents a promising solution to deal with tendinopathies and aims to develop effective implantable 3D biomimetic scaffolds with ideally native tissue’s physical, mechanical, biological, and functional qualities. These constructs can be engineered with stem cells to potentiate their teno-inductive and immunomodulatory properties (El Khatib, Mauro, Di Mattia, et al., 2020; El Khatib, Mauro, Wyrwa, et al., 2020; Russo et al., 2020). In this context, amniotic epithelial stem cells (AECs) have recently received much attention in the field of regenerative medicine due to their capacity to differentiate into the tenogenic lineage and to their immunomodulatory profile (Barboni et al., 2012, 2018; Mauro et al., 2016).
The focus of this research was to create bundle tendon-like PLGA 3D scaffolds, which mimic tendon macro and micro-architecture and biomechanics, and to assess their impacts on AECs’ biological potential.
METHODS: PLGA fleeces, with highly aligned fibers, were fabricated via electrospinning technique through a rotatory collector. The obtained fleeces were then wrapped manually to form 3D tendon-like scaffolds, which were evaluated in terms of structure, mechanical characteristics, and biological influence on AECs by conducting in vitro experiments. Indeed, ovine AECs, seeded on the PLGA 3D scaffolds and fleeces, were compared for their morphological changes and for the cytoplasmic expression of TNMD, a mature tendon protein, respect to cells cultured on Petri dishes (CTR), after 48h and 7d of culture through a confocal microscope. Moreover, the teno-differentiative potential and immunomodulatory properties of the produced constructs were assessed by analyzing the gene expression of tendon related markers (early: SCX, late: COL1 and TNMD) and of anti- (IL10) and pro- (IL12) inflammatory cytokines respectively. Moreover, the present research evaluated YAP protein activation in the engineered AECs through immunofluorescence assay by assessing its cellular localization.
RESULTS: The produced PLGA 3D scaffolds, analyzed though a scanning electron microscope, showed high fiber alignment, which closely resemble the architecture, both macroscopically and microscopically, and the biomechanical properties of native tendon tissue. AECs seeded on the produced constructs exhibited an elongated tenocyte-like morphology already after 24 hours, while AECs cultivated on petri dishes (CTR) retained their characteristic polygonal morphology. The engineered AECs' phenotypic change was also confirmed by visualizing the cytoplasmic expression of TNMD protein and supported by tendon-related genes (SCX, COL1, and TNMD) upregulation at 7-day culture respect to CTR cells (p<0.05), which showed no TNMD protein expression or significant increase in tendon-related genes. Moreover, AECs seeded on 3D PLGA scaffolds showed an anti-inflammatory profile, with a significant higher IL10/IL12 ratio respect to the CTR (p<0.05). Finally, 3D scaffolds with highly aligned fibers stimulated AECs in terms of cell cytoskeleton stress, activating their mechanosensitive YAP pathway by significantly increasing YAP nuclear localization compared to the CTR (p<0.05), in which YAP was instead localized in the cytoplasm.
DISCUSSION & CONCLUSIONS: Overall, these results support the biomimicry of the fabricated scaffolds in terms of structure and biomechanics and reveal their great teno/immuno-inductive potential and mechanosensing stimulus on AECs, thus standing biomimetic PLGA 3D scaffolds as a potential candidate for tendon regeneration
Recueil.
No full textAl-Kathibat al kamina fiman lakina hou bil-Andalous min shoʿara al-miat al-thaminaNumérisation effectuée à partir d'un document de substitution.Poésies sur l'amour, par le shaïkh Abou Djaʿfar Ahmad ibn Ali ibn Mohammad ibn Khatima (folio 1 verso) ; recueil de poésies par Abou Djaʿfar ibn Zarkala (folio 7 verso) ; la al-Kathibat al-kamina fi-man lakinahou bil-Andalous min shoʿara al-miʾat al-thamina, anthologie des poètes espagnols du VIIIe siècle de l'hégire, par le vizir Abou Abd Allah Mohammad ibn al-Khatib al-Salmani (folio 15 verso). Ce volume a appartenu à l'émir Abd al-Kadir qui l'a donné le 14 août 1844 à un officier nommé Léon Roche
Mathematics, Logic, and their Philosophies:Essays in Honour of Mohammad Ardeshir
No full textThis volume is a collection of essays in honour of Professor Mohammad Ardeshir. It examines topics which, in one way or another, are connected to the various aspects of his multidisciplinary research interests. Based on this criterion, the book is divided into three general categories. The first category includes papers on non-classical logics, including intuitionistic logic, constructive logic, basic logic, and substructural logic. The second category is made up of papers discussing issues in the contemporary philosophy of mathematics and logic. The third category contains papers on Avicenna’s logic and philosophy.Mohammad Ardeshir is a full professor of mathematical logic at the Department of Mathematical Sciences, Sharif University of Technology, Tehran, Iran, where he has taught generations of students for around a quarter century. Mohammad Ardeshir is known in the first place for his prominent works in basic logic and constructive mathematics. His areas of interest are however much broader and include topics in intuitionistic philosophy of mathematics and Arabic philosophy of logic and mathematics. In addition to numerous research articles in leading international journals, Ardeshir is the author of a highly praised Persian textbook in mathematical logic. Partly through his writings and translations, the school of mathematical intuitionism was introduced to the Iranian academic community
Mathematics, Logic, and their Philosophies:Essays in Honour of Mohammad Ardeshir
No full textThis volume is a collection of essays in honour of Professor Mohammad Ardeshir. It examines topics which, in one way or another, are connected to the various aspects of his multidisciplinary research interests. Based on this criterion, the book is divided into three general categories. The first category includes papers on non-classical logics, including intuitionistic logic, constructive logic, basic logic, and substructural logic. The second category is made up of papers discussing issues in the contemporary philosophy of mathematics and logic. The third category contains papers on Avicenna’s logic and philosophy.Mohammad Ardeshir is a full professor of mathematical logic at the Department of Mathematical Sciences, Sharif University of Technology, Tehran, Iran, where he has taught generations of students for around a quarter century. Mohammad Ardeshir is known in the first place for his prominent works in basic logic and constructive mathematics. His areas of interest are however much broader and include topics in intuitionistic philosophy of mathematics and Arabic philosophy of logic and mathematics. In addition to numerous research articles in leading international journals, Ardeshir is the author of a highly praised Persian textbook in mathematical logic. Partly through his writings and translations, the school of mathematical intuitionism was introduced to the Iranian academic community
EFEKTIVITAS PROGRAM KOMUNITAS PECINTA MASJID (KPM) SEKOLAH TINGGI ILMU DA’WAH MOHAMMAD NATSIR DALAM MENUMBUHKAN SEMANGAT DA’WAH MAHASISWA
No full textTujuan penelitian: Untuk mengungkap efektivitas program Komunitas Pecinta Masjid Sekolah Tinggi Ilmu Da’wah Mohammad Natsir dalam menumbuhkan semangat da’wah mahasiswa. Metode penelitian: Kualitatif. Hasil penelitian: Pertama, Mahasiswa mampu mengaplikasikan program kegiatan KPM yang telah ditentukan oleh kampus, Kedua, Dari 30 orang mahasiswa yang penulis wawancarai, mereka merasakan adanya peningkatan pada diri mereka terkait semangat dalam berda’wah dibandingkan ketika mereka belum mengikuti program-program KPM. Disamping itu mereka merasakan adanya penambahan wawasan keilmuan.Ketiga, Adanya perubahan dari sisi perilaku mahasiswa ke arah yang lebih baik, seperti, sudah terbiasa adzan shubuh, mulai rajin sholat malam, dan interaksi kepada masyarakat semakin baik, dan lain-lain.Keempat, Adanya peningkatan dari sisi kemampuan berda’wah, yang mana sebelumnya mahasiswa hanya belajar teori saja tanpa mengaplikasikan apa yang sudah didapatkan dari kampus. Kelima, Mahasiswa mampu menghidupkan Kegiatan Masjid, seperti mengajar, mengkoordinir sholat lima waktu, ta’lim, kebersihan, baksos, muadzin, khatib jum’at, mading dan lain sebagainya
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