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Now showing items 31-40 of 84
An investigation into hybrid carbon/glass fiber reinforced epoxy composite automotive drive shaft
(
Elsevier
, 2011 , Article)
This paper examines the effect of fiber orientation angles and stacking sequence on the torsional stiffness, natural frequency, buckling strength, fatigue life and failure modes of composite tubes. Finite element analysis ...
النفط الخام في دول اقليم الخليج العربي بين التصدير والتصنيع
(
جامعة البحرين
, 2011 , Article)
يهدف البحث الى دراسة واقع وتطور صناعة النفط في إقليم الخليج العربي بدوله الثماني الذي يعتبر الأكثر أهمية اليوم في مجال النفط عالميا ، وحتى المستقبل رغم ظهور منافسين.
وتحاول الورقة الاجابة عن بعض التساؤلات التي ...
Teacher perceptions of professional development in the context of national educational reform: the case of Qatar*
(
Blackwell Publishing Ltd
, 2011 , Article)
In light of nationally mandated educational changes in Qatar, this study investigates in-service teachers' perceptions of professional development (PD). The aims are to identify challenges facing teachers' PD. The respondents ...
Novel charge transfer complexes of the donor 1,4,7,10,13,16-hexamethyl-1,4,7,10,13,16-hexaazacyclooctadecane and the acceptors iodine, TCNE, and TCNQ
(
Elsevier
, 2011 , Article)
Abstract Novel charge transfer complexes have been formed in the reaction of the interesting powerful electron donor 1,4,7,10,13,16-hexamethyl-1,4,7,10,13,16-hexaazacyclooctadecane (HMHACOD) with σ-electron acceptor iodine ...
الطبيعة القانونية لعقد احتراف لاعب كرة القدم (دراسة فى ضوء العقد النموذجي المعد من قبل الاتحاد القطري لكرة القدم)
(
وزارة العدل - دولة قطر
, 2011 , Article)
تشهد دولة قطر تقدما ملحوظا على كافة الأصعدة، ولعل من أهم المجالات التى شهدت طفرة كبيرة فى الآونة الأخيرة، مجال النشاط الرياضي، ولعل النجاح الباهر الذى حظيت به دولة قطر من استحقاقها الفوز بتنظيم مسابقة كأس العالم لكرة القدم ...
Pharmacy student perceptions of public health service roles and responsibilities
(
Blackwell Publishing Ltd
, 2011 , Article)
Background There is increasing emphasis on pharmacists' assuming responsibility for public health promotion and delivery with formal expansion of public health activities in their practice. A number of pharmacy school ...
High-performance adaptive Perturb and observe MPPT technique for photovoltaic-based microgrids
(
IEEE
, 2011 , Article)
Solar photovoltaic (PV) energy has witnessed double-digit growth in the past decade. The penetration of PV systems as distributed generators in low-voltage grids has also seen significant attention. In addition, the need ...
Multiple-module high-gain high-voltage DCDC transformers for offshore wind energy systems
(
IEEE
, 2011 , Article)
Renewable energy sources, such as offshore wind farms, require high voltage gains in order to interface with power transmission networks. These conversions are normally made using bulky, complex, and costly transformers ...
A modified stationary reference frame-based predictive current control with zero steady-state error for LCL coupled inverter-based distributed generation systems
(
IEEE
, 2011 , Article)
This paper proposes a modified stationary reference frame-based predictive current controller with zero steady-state error for LCL coupled inverter-based distribution generation systems. Analytical expressions for the ...
Improvement of Bacillus thuringiensis bioinsecticide production by sporeless and sporulating strains using response surface methodology
(
Elsevier B.V.
, 2011 , Article)
Statistical experimental designs, involving a Plackett-Burman design followed by a rotatable central composite design were used to optimize the culture medium constituents for Bacillus thuringiensis bioinsecticide production. ...