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Understanding How Learners Use Massive Open Online Courses and Why They Drop Out: Thematic Analysis of an Interview Study in a Developing Country
No full textThis article presents a qualitative study on Massive Open Online Course (MOOC)
dropout in a developing world. Thematic analyses of semistructured interviews were
conducted with 52 learners, eight weeks after their actual registration for a course of
their choice as part of a self-learning activity. The results uncover novel design factors
affecting MOOC retention. Among these factors are Learner Control, in which users
can design their own long-term learning track from various course modules;
Integrative Design, comprising learners’ own accounts on social media; and
Independent Design, in which a course’s modules can be taught separately and learners
need not complete an overall course but rather can select modules from various
courses. Mobility and Language are identified as important decisive factors for users
to drop out from or complete a MOOC Course. This research also highlights the
importance of Diversity and Novelty for this type of application. The research reveals
the Multitasking Behavior of users, leading to the need for Easy-to-Scan content. The
findings provide a basis for improving the understanding toward reasons for MOOC
drops and suggest a number of practical design recommendations for designers and
providers. Furthermore, the completion rate observed in this study was slightly
higher than was typically found in previous studies. This result might suggest that using a MOOC as a learning opportunity within the context of a universityaccredited
program would increase the likelihood of completion
Evaluation of the efficiency of continuous wavelet transform as processing and preprocessing algorithm for resolution of overlapped signals in univariate and multivariate regression analyses; an application to ternary and quaternary mixtures
No full textWavelets have been adapted for a vast number of signal-processing applications due to the amount of information that can be extracted from a signal. In this work, a comparative study on the efficiency of continuous wavelet transform (CWT) as a signal processing tool in univariate regression and a pre-processing tool in multivariate analysis using partial least square (CWT-PLS) was conducted. These were applied to complex spectral signals of ternary and quaternary mixtures. CWT-PLS method succeeded in the simultaneous determination of a quaternary mixture of drotaverine (DRO), caffeine (CAF), paracetamol (PAR) and p-aminophenol (PAP, the major impurity of paracetamol). While, the univariate CWT failed to simultaneously determine the quaternary mixture components and was able to determine only PAR and PAP, the ternary mixtures of DRO, CAF, and PAR and CAF, PAR, and PAP. During the calculations of CWT, different wavelet families were tested. The univariate CWT method was validated according to the ICH guidelines. While for the development of the CWT-PLS model a calibration set was prepared by means of an orthogonal experimental design and their absorption spectra were recorded and processed by CWT. The CWT-PLS model was constructed by regression between the wavelet coefficients and concentration matrices and validation was performed by both cross validation and external validation sets. Both methods were successfully applied for determination of the studied drugs in pharmaceutical formulations
Future Dental Journal Volume 3, Issue 1
No full textArticles : Gingival pigmentation (cause, treatment and histological preview) -- Effect of core/veneer thickness ratio and veneer translucency on absolute and relative translucency of CAD-On restorations -- Identification of stiffness variations in supporting substances of a human canine tooth with a bracket-beam-piezoelectric sensor and its electromechanical impedance -- Comparative study of the possible effect of bovine and some plant-based milk on cola-induced enamel erosion on extracted human mandibular first premolar (scanning electron microscope and X-ray microanalysis evaluation) -- Evaluation of implant stability simultaneously placed with sinus lift augmented with putty versus powder form of demineralized bone matrix in atrophied posterior maxilla -- A rare presentation of extra nodal rosai-dorfman disease (case report)Future Dental Journal (FDJ) publishes scientific articles, case reports and comparison studies evaluating materials and methods of dental treatment and also articles concerned with dental education.
Dentists can learn about new concepts, clinical developments, clinical opinions, treatments and the latest advances in techniques and instrumentation that helps them keep pace with rapid changes in this field and provide them with a knowledge transfer platform for rapid publication of reports and articles through an international journal.
This journal encourages researches concerning improvement of dental health through the latest technologies as tissue engineering, nanotechnology, laser application and implantology.
The journal is interested in inter- disciplinary articles within the dental field, and group work with other disciplines as medicine, physics and chemistry. The journal also aims to provide clinicians, scientists and students of dentistry with a knowledge transfer platform for rapid publication of reports and articles through an international journal.Subject areas include, but are not limited to the following fields: •
Periodontics
Orthodontics
Endodontics
Oral medicine
Dental Radiology
Oral surgery
Dental materials
Oral sciences
Pedodontics
Oral biology
Prosthodontics
Dental implants
Crown and Bridge
Oral Pathology and Microbiology
Community dental health
Oral hygiene
Cosmetic dentistry
Dental educationFuture University In Egyp
Effect of Carbon Nano-Tubes, Micro and Nano Dispersions of SiC and Al2O3 on the Mechanical and Physical Properties of Pure Copper
No full text Reviews on Advanced Materials Science 52(1):126-133 · December 2017This paper studies the physical and mechanical properties of pure copper powder with
various reinforcement materials at different volume fractions. The used reinforcement materials
are carbon nanotubes CNT (0.5-2 wt.%) as nano particles, Al2O3 (1-4 wt.%), and SiC (1-4 wt.%) as
micro particles. Various characteristics were evaluated on the composite specimens such as
microstructures, density, electrical conductivity, thermal conductivity, hardness, and compression
properties to investigate the suitable reinforcement percentage that achieves the best physical
and mechanical properties. The micron-sized Al2O3 and SiC and nano sized CNT has shown an
enhancement on the mechanical and physical properties of the composite. The electrical and
thermal conductivities were evaluated and the results have shown positive enhancements
AN IN VITRO STUDY OF THE INFLUENCE OF INTERIMPLANT DISTANCE AND IMPLANT LENGTH ON THE STRESSES INDUCED AROUND MANDIBULAR OVERDENTURES IMPLANT
No full textPurpose: A straingauge analysis was performed to investigate the influence of interimplant distance and implant length on stress induced around mandibular overdenture implant .
Materials and methods: The stresses were evaluated for three groups, group (A) two implants of length 11 mm were placed at 19, 23 and 29 mm from each other, group (B) two implants of length 13 mm were placed at 19, 23 and 29 mm from each other and group(C) two implants of length 15 mm were placed at 19, 23 and 29 mm from each other. Acrylic casts were constructed representing completely edentulous mandible. On each cast two Implants of same diameter 3.4mm were inserted, upon which complete overdentures supported by ball attachments were constructed. Strain gauges were installed in the labial, lingual and distal sides of each implant to record the strain induced by the applied loads. A special loading device used to produce standardized static vertical load of 60N . The loading positions were located at six points on the occlusal surface (second premolar, P2; first molar, M1; second molar, M2 on the right and left sides).
Results: Maximum stress areas were numerically located at the the buccal sides of implants. Increasing implant length gradually from 11 mm to13 mm and to 15 mm decreased the maximum stresses around the implants. Increasing interimplant distances gradually from 19 mm to 23 mm and to 29mm increased the maximum stresses around the implants
Accuracy and Reliability of Intraoral Scanners: Are They the Better Option?
No full textPurpose of Review The aim was to compare the accuracy of digital intraoral impressions with conventional impressions on the fabrication of different types of restorations. This study also compared the accuracy, reliability, and ease of use of different types of intraoral scanners available and correlated the results with the different scanning technologies.Recent Findings Digital impressions offer the same level of accuracy as conventional impressions regarding fabrication of crowns, fixed dental prostheses (FDPs), implant-supported crowns, and short-span FDPs with marginal gap values within the clinically acceptable range (<120 μm). However, for full- arch restorations, conventional impressions result in better accuracy.Summary Further enhancements needs to be undertaken re- garding intraoral scanners to improve its accuracy regarding fabrication of full-arch restorations. Further in vivo studies evaluating the accuracy of intraoral digital impressions on the fabrication of a wider range of restorations such as inlays, veneers, and full-arch restoration need to be conducted
Evaluation of Retention for Implant Retained Mandibular over Denture using Two Different Denture Base Materials
No full textObjectives: This study was made for measuring and comparing the Retention of implant retained mandibular overdenture using resilient attachment with two different denture base materials (flexible and conventional acrylic resins). Methods/ Statistical Analysis: Twenty male patients selected for this study with completely edentulous mandible and divided according to the type of denture base material used into two equal groups, both groups received implant retained overdenture with resilient attachment. Group I; denture base made from conventional acrylic, Group II; denture base from thermo-elastic flexible acrylic, retention evaluation was made zero time, two months and four months after insertion. Findings: In this study, there was no statistical significance of difference between the groups, at time of insertion, 2 and 4 months after insertion. The highest values of retention were enlisted with the overdenture made from them oplastic acrylic resin and that may due to high inter facial surface tension recorded values of thermoplastic acrylic resin. Strong tension increase retention of the prosthesis in place. Flexible acrylic denture base showed better retention values and function than denture base made from heat cured acrylic resin material and it is agreed with another study which proved that retention values of Thermo-elastic resin was higher than conventional resin as the Thermo-elastic resins have greater flexibility, adaptation and fitting values than conventional resin. So, it has an improved retention because of inter-facial surface tension effect. Application/Improvements: Using overdenture base made of thermo-elastic acrylic resin clinically better than using overdenture base made of conventional acrylic denture base in retention and function
Almaza City Center
No full textAlmanza city center project, worth an estimated EGP 4 billion, is expected to create 22,000 direct and 14,000 indirect job opportunities. Located in Cairo's high- end suburb of Heliopolis on the north eastern quadrant of the junction between the Cairo-Suez Road and Nasr Road in Heliopolis, City Centre Almanza is projected to open by Q1 2019, and will feature 103,455 square meters of retail space offering over 300 of the best international and local brands, and as well as 23 restaurants, 1 food court outlets and nine cafes. In addition to housing a unique retail mix of the leading international and local brands, City Centre Almanza will include a 13,040 square meter Carrefour, 16 state-of-the-art VOX cinema screens, a 1,800 square meter Magic Planet family entertainment center and 4,000 parking spacesSupervised by Dr. Ibrahim El Mahd
Future Dental Journal Volume 3, Issue 2
No full textArticles : Efficacy of transforming growth factor- β on development of ameloblasts and odontoblasts in tooth germ of young albino rat -- Evaluation of piezotomed alveolar ridge splitting with stereolithographic surgical guide for implant placement (clinical study) -- Microtensile bond strength and scanning electron microscopic evaluation of zirconia bonded to dentin using two self-adhesive resin cements; effect of airborne abrasion and aging -- Effect of different beverages on the color stability and microhardness of CAD/CAM hybrid versus feldspathic ceramic blocks: An in-vitro study -- Internal fit of lithium disilicate and resin nano-ceramic endocrowns with different preparation designs -- Effect of the parotid salivary gland on calcium and amylase enzyme levels in blood and its influence on bone healing in albino rats (Histological and radiographic study) -- Necrotizing fasciitis with toxic shock syndrome in 5 month old baby: A case reportFuture Dental Journal (FDJ) publishes scientific articles, case reports and comparison studies evaluating materials and methods of dental treatment and also articles concerned with dental education.
Dentists can learn about new concepts, clinical developments, clinical opinions, treatments and the latest advances in techniques and instrumentation that helps them keep pace with rapid changes in this field and provide them with a knowledge transfer platform for rapid publication of reports and articles through an international journal.
This journal encourages researches concerning improvement of dental health through the latest technologies as tissue engineering, nanotechnology, laser application and implantology.
The journal is interested in inter- disciplinary articles within the dental field, and group work with other disciplines as medicine, physics and chemistry. The journal also aims to provide clinicians, scientists and students of dentistry with a knowledge transfer platform for rapid publication of reports and articles through an international journal.Subject areas include, but are not limited to the following fields: •
Periodontics
Orthodontics
Endodontics
Oral medicine
Dental Radiology
Oral surgery
Dental materials
Oral sciences
Pedodontics
Oral biology
Prosthodontics
Dental implants
Crown and Bridge
Oral Pathology and Microbiology
Community dental health
Oral hygiene
Cosmetic dentistry
Dental educationFuture University In Egyp
Out flow and clogging of rigid and soft particles in silos with small apertures
No full textThe area of research presented in this dissertation on silo discharge experiments, has attracted a great deal of interest from researchers into granular matter. But it is also important because of its occurrence in everyday life and its potential signi cance for several elds of industry. I investigated the statistics of discharge phenomena for di erent types of materials, focusing on shape-anisotropic grains and clogging events when the granulate
ow sou tfro msilo swit hsmal laperture scompare dt oth esiz eo fth egrains .I nm yexperimenta lwor k Iuse dthre edi eren tclasse so fgranula rmaterial s(e:g :isotropi char dgrains ,anisotropi char dgrain san dsof tspheres )t ounderstan dho wth easpec trati oan dth esoftnes sin
uen cet hedischar gedynami csa ndt hecloggi ngprobabilit y. Inord er toexecu te mywor k ,Ibui lta ndmodi edthr eedi ere ntsi loexperiment s,ea ch ofth embas ed o naspeci cid eaa ndillustrat ed indeta il i nasepara techapte r.Wh atfollo ws i sasumma ry oft hema inresul tswhi chwe reobtain edduri ng myP hDstu dy aspresent ed int heprevio uschaptersupervision by : Ralf Stannarius
supervision by :Ingo Rehber