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السجلات المعروضة 141 -- 150 من 5521
Ionic Liquids in Bulk and at an Interface
(
John Wiley & Sons, Inc
, 2015 , Book chapter)
In the present chapter, we describe different types of investigation carried out by research groups based at CQE/IST/UTL and ITQB/UNL and their ramifications in terms of surface science. Most of the work is focused on the ...
Conditions for Student-Centered Teaching and Learning: Relationship Between Classroom Processes and School Achievement of Curriculum Standards
(2011 , Conference Paper)
Qatari educational curriculum standards emphasize student-centered classrooms where students actively engage in inquiry and problem solving. Classrooms characterized by these elements should emerge as more successful on ...
Effect Of Learner-centered Professional Development On Teaching Behaviors In Qatari Elementary Math And Science Classrooms
(
QScience
, 2014 , Conference Paper)
In late 2002, Qatar established key elements of educational reform, known as "Education for a New
Era", including curriculum standards, emphasis on problem-solving through student-centered teaching;
standards-based ...
Modelling the degradation of vibration characteristics of reinforced concrete beams due to flexural damage
(
John Wiley & Sons, Ltd.
, 2015 , Article)
This paper presents an improved crack model incorporating non-linearity of flexural damage in concrete to reproduce changes in vibration properties of cracked reinforced concrete beams. A reinforced concrete beam model ...
To Relay or Not To Relay in Cognitive Radio Sensor Networks
(
IEEE
, 2014 , Article)
A recent investigation on MAC layer in cognitive radio networks proposed the primary packet relaying by the secondary node maintaining an extra queue used for this particular addable functionality. Nevertheless, relaying ...
Exact SINR analysis of OFDM systems under joint Tx/RX I/Q imbalance
(
IEEE
, 2013 , Conference Paper)
The direct-conversion architecture used for Orthogonal Frequency Division Multiplexing (OFDM) systems suffers from intercarrier interference (ICI) between image subcarriers in each OFDM symbol due to I/Q imbalance between ...
Maximizing Energy Efficiency in Multiple Access Channels by Exploiting Packet Dropping and Transmitter Buffering
(
IEEE
, 2015 , Article)
Quality of service (QoS) for a network is characterized in terms of various parameters specifying packet delay and loss tolerance requirements for the application. The unpredictable nature of the wireless channel demands ...
Implementation and Analysis of Reward Functions under Different Traffic Models for Distributed DSA Systems
(
IEEE
, 2015 , Article)
In this paper, we implement and analyze a resource allocation protocol for distributed dynamic spectrum allocation (DSA) systems. The DSA protocol is a learning-based protocol that allows secondary users (SU) to exploit ...
Beamforming OFDM Performance under Joint Phase Noise and I/Q Imbalance
(
IEEE
, 2015 , Article)
Phase noise (PHN) and in-phase/quadrature (I/Q) imbalance are two major RF impairments in direct-conversion wireless transceivers. Beamforming and orthogonal frequency division multiplexing (OFDM) schemes have been adopted ...
Anthropometric and lifestyle characteristics of active and inactive saudi and british adolescents
(
Wiley Periodicals, Inc.
, 2014 , Article)
To compare the anthropometric and lifestyle characteristics of active and inactive adolescents in Saudi Arabia and Britain. A school-based cross-sectional study was conducted at four cities in Saudi Arabia (Riyadh and ...