67,234 research outputs found
Regression between headmaster leadership, task load and job satisfaction of special education integration program teacher
Managing school is a daunting task for a headmaster. This responsibility is exacerbated when it involves the Special Education Integration Program (SEIP). This situation requires appropriate and effective leadership in addressing some of the issues that are currently taking place at SEIP such as task load and job satisfaction. This study aimed to identify the influence of headmaster leadership on task load and teacher job satisfaction at SEIP. This quantitative study was conducted by distributing 400 sets of randomized questionnaires to SEIP teachers across Malaysia through google form. The data obtained were then analyzed using Structural Equation Modeling (SEM) and AMOS software. The results show that there is a significant positive effect on the leadership of the headmaster and the task load of the teacher. Likewise, the construct of task load and teacher job satisfaction has a significant positive effect. However, for the construct of headmaster leadership and teacher job satisfaction, there was no significant positive relationship. This finding is very important as a reference to the school administration re-evaluating their leadership so as not to burden SEIP teachers and to give them job satisfaction. In addition, the findings of this study can also serve as a guide for SEIP teachers to increase awareness of the importance of managing their tasks. This study also focused on education leadership in general and more specifically on special education leadership
Modelling of advanced submicron gate InGaAs/InAIAs pHEMTS and RTD devices for very high frequency applications
InP based InAlAs/InGaAs pseudomorphic High Electron Mobility Transistors
(pHEMTs) have shown outstanding performances, which makes them prominent in high
frequency mm-wave and submillimeter-wave applications. However, conventional
InGaAs/InAlAs pHEMTs have major drawbacks, i.e., very low breakdown voltage and high
gate leakage current. These disadvantages degrade device performance, especially in
Monolithic Microwave Integrated Circuit (MMIC) low noise amplifiers (LNAs). The
optimisation of InAlAs/InGaAs epilayer structures through advanced bandgap engineering
together with gate length reduction from 1 m into deep sub-μm regime is the key solution
to enabled high breakdown and ultra-high speed, low noise pHEMT devices to be fabricated.
Concurrently, device modelling plays a vital role in the design and analysis of pHEMT
device and circuit performance. Physical modeling becomes essential to fully characterise
and understand the underlying physical phenomenon of the device, while empirical
modelling is significant in circuit design and predicts device’s characteristic performance.
In this research, the main objectives to accurately model the DC and RF
characteristics of the two-dimensional (2D) physical modelling for sub-μm gate length for
strained channel InAlAs/InGaAs/InP pHEMT has been accomplished and developed in
ATLAS Silvaco. All modelled devices were optimised and validated by experimental
devices which were fabricated at the University of Manchester; the sub-micrometer devices
were developed with T-gate using I-line optical lithography. The underlying device physics
insight are gained, i.e, the effects of changes to the device’s physical structure, theoretical
concepts and its general operation, hence a reliable pHEMT model is obtained. The kink
anomalies in I-V characteristics was reproduced and the 2D simulation results demonstrate
an outstanding agreement with measured DC and RF characteristics.
The aims to develop linear and nonlinear models for sub-μm transistors and their
implementation in MMIC LNA design is achieved with the 0.25 m
In0.7Ga0.3As/In0.52Al0.48As/InP pHEMT. An accurate technique for the extraction of empirical
models for the fabricated active devices has been developed and optimised using Advance
Design System (ADS) software which demonstrate excellent agreement between
experimental and modelled DC and RF data. A precise models for MMIC passive devices
have also been obtained and incorporated in the proposed design for a single and double
stage MMIC LNAs in C- and X-band frequency. The single stage LNA is designed to
achieve maximum gain ranging from 9 to 13 dB over the band of operation while the gain is
increased between 20 dB and 26 dB for the double stage LNA designs. A noise figure of
less than 1.2 dB and 2 dB is expected respectively, for the C- and X-band LNA designed
while retaining stability across the entire frequency bands.
Although the RF performance of pHEMT is being vigorously pushed towards
terahertz region, novel devices such as Resonant Tunnelling Diode (RTD) are needed to
support future ultra-high speed, high frequency applications especially when it comes to
THz frequencies. Hence, the study of physical modelling is extended to quantum modelling
of an advanced In0.8Ga0.2As/AlAs RTD device to effectively model both large size and
submicron RTD using Silvaco’s ATLAS software to reproduce the peak current density,
peak-to-valley-current ratio (PVCR), and negative differential resistance (NDR) voltage
range. The simple one-dimensional physical modelling for the RTD devices is optimised to
achieve an excellent match with the fabricated RTD devices with variations in the spacer
thickness, barrier thickness, quantum well thickness and doping concentration
XMDS2: Fast, scalable simulation of coupled stochastic partial differential equations
XMDS2 is a cross-platform, GPL-licensed, open source package for numerically
integrating initial value problems that range from a single ordinary
differential equation up to systems of coupled stochastic partial differential
equations. The equations are described in a high-level XML-based script, and
the package generates low-level optionally parallelised C++ code for the
efficient solution of those equations. It combines the advantages of high-level
simulations, namely fast and low-error development, with the speed, portability
and scalability of hand-written code. XMDS2 is a complete redesign of the XMDS
package, and features support for a much wider problem space while also
producing faster code.Comment: 9 pages, 5 figure
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This interdisciplinary eXtensible Building Operating System–Vehicles project focuses on controlling plug-in electric vehicle charging at residential and small commercial settings using a novel and flexible open-source, open-architecture charge communication and control platform. The platform provides smart charging functionalities and benefits to the utility, homes, and businesses.This project investigates four important areas of vehicle-grid integration research, integrating technical as well as social and behavioral dimensions: smart charging user needs assessment, advanced load control platform development and testing, smart charging impacts, benefits to the power grid, and smart charging ratepayer benefits
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