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Now showing items 3071-3080 of 11217
Nonlinear stochastic drillstrings vibrations: Parametric study for stick-slip suppression
(
Institute of Physics Publishing
, 2018 , Conference Paper)
Unstable vibrations caused by the transition between static and kinetic frictions produces stick-slip motions which is one of the primary causes of poor drilling efficiency and mechanism failure in the drilling process. ...
بدائل العقوبات السالبة للحرية في القانون القطري
(2019 , Master Thesis)
ان العقوبات السالبة للحرية من أقدم الطرق العقابية التي عرفتها البشرية، وقد تناولت مفهوم العقوبة السالبة للحرية، واثارها السلبية التي ترتبت عليها من اكتظاظ للسجون وتعلم المحكوم عليهم لأساليب إجرامية جديدة. كما بينت المعيار ...
Modeling of student academic achievement in engineering education using cognitive and non-cognitive factors
(
Emerald Group Publishing Ltd.
, 2019 , Article)
The retention and success of engineering undergraduates are increasing concern for higher-education institutions. The study of success determinants are initial steps in any remedial initiative targeted to enhance student ...
Association of Urinary Vitamin D-binding Protein and Megalin as Biomarkers for Diabetic Nephropathy in Type 2 Diabetes Mellitus in Qatari Patients
(
OMICS
, 2019 , Article)
Abstract
Background: Nephropathy is a common complication of type 2 diabetes mellitus (T2DM). Previous studies
revealed that T2DM patients with nephropathy have higher concentrations of urinary Vitamin D Binding ...
No longer locally extinct? Tracing the origins of a lion (Panthera leo) living in Gabon
(
Springer Netherlands
, 2018 , Article)
Lions (Panthera leo) are of particular conservation concern due to evidence of recent, widespread population declines in what has hitherto been seen as a common species, robust to anthropogenic disturbance. Here we use ...
Understanding In-App Ads and Detecting Hidden Attacks through the Mobile App-Web Interface
(
Institute of Electrical and Electronics Engineers Inc.
, 2018 , Article)
Mobile users are increasingly becoming targets of malware infections and scams. In order to curb such attacks it is important to know how these attacks originate. We take a previously unexplored step in this direction. ...
Modified transformerless dual buck inverter with improved lifetime for PV applications
(
Institute of Electrical and Electronics Engineers Inc.
, 2018 , Conference Paper)
The Dual Buck Inverter (DBI) possesses no shoot-through concerns and it can improve the efficiency by utilizing power MOSFETs. This is because at accidentally triggered shoot-through states; two inductors are in-parallel ...
On the nanogate-opening pressures of copper-doped zeolitic imidazolate framework ZIF-8 for the adsorption of propane, propylene, isobutane, and n-butane
(
Springer New York LLC
, 2019 , Article)
In this study, a zeolitic imidazolate framework-8 (ZIF-8) and its copper-doped variants (Cu-doped ZIF-8) were synthesized using a rapid microwave technique. The products were characterized by XRD, NanoSEM, FTIR, Raman ...
A review of fouling mechanisms, control strategies and real-time fouling monitoring techniques in forward osmosis
(
MDPI AG
, 2019 , Article Review)
Forward osmosis has gained tremendous attention in the field of desalination and wastewater treatment. However, membrane fouling is an inevitable issue. Membrane fouling leads to flux decline, can cause operational problems ...
Synthesis, Bioapplications, and Toxicity Evaluation of Chitosan-Based Nanoparticles.
(
MDPI
, 2019 , Article)
The development of advanced nanomaterials and technologies is essential in biomedical engineering to improve the quality of life. Chitosan-based nanomaterials are on the forefront and attract wide interest due to their ...