Search results for: S. Javid

Items from 1 to 18 out of 18 results

article

Investigation of the effect of HZSM-5 over HDS and reforming processes for clean gasoline production

K. Sharifi, R. Halladj, S. Javid Royaee, M. Reza Jafari Nasr

International Journal of Environmental Science and Technology > 2019 > 16 > 2 > 865-874

HZSM-5 catalysts with different SiO₂/Al₂O₃ ratios were synthesized, and the effect of acidity over the octane enhancement alongside with desulfurization of heavy naphtha was investigated. In this way, the catalysts with the SiO₂/Al₂O₃ ratios of 20, 40, 60, 80 and 200 were experimentally synthesized and their physical characteristics besides their acidities were measured through X-ray diffraction,...

article

Association Between the 21-Gene Recurrence Score and Isolated Local-Regional Recurrence in Hormone Receptor-Positive Breast Cancer

D. Buscariollo, A. Cronin, R.J. Bleicher, A. Cohen, more

International Journal of Radiation Oncology*Biology*Physics > 2016 > 96 > 2(S) > E13

article

Investigation of Microstructural Uniformity During Isothermal Forging of Ti-6Al-4V

S. Javid Mirahmadi, Mohsen Hamedi, Mohammad Habibi Parsa

Journal of Materials Engineering and Performance > 2014 > 23 > 12 > 4411-4420

The effect of strain on microstructural changes and the primary alpha (α_P) volume fraction as well as the workability of Ti-6Al-4V are studied by isothermal compression of wedge-shaped specimens at the initial temperatures of 850, 900, and 950 °C and platen velocities of 2.5, 25, and 250 mm/min in combination with finite element method. The results show that higher platen velocity leads to a lesser...

article

Investigating the effects of cross wedge rolling tool parameters on formability of Nimonic® 80A and Nimonic® 115 superalloys

S. Javid Mirahmadi, Mohsen Hamedi, Shahabeddin Ajami

The International Journal of Advanced Manufacturing Technology > 2014 > 74 > 5-8 > 995-1004

Ni-base superalloys are a class of materials with high temperature excellent tensile, creep, and corrosion properties that have widespread applications in manufacturing hot parts of gas turbines. Application of cross wedge rolling (CWR) process for manufacturing Ni-base superalloys is of least investigated areas. In this article, the effects of CWR tool parameters on formability of Nimonic® 80A and...

article

Numerical and experimental investigation of process parameters in non-isothermal forward extrusion of Ti–6Al–4V

S. Javid Mirahmadi, Mohsen Hamedi

The International Journal of Advanced Manufacturing Technology > 2014 > 75 > 1-4 > 33-44

Ti–6Al–4V is the most common Ti alloy that may be worked at supra or subtransus temperatures, conventionally or isothermally. In this article, the effect of extrusion process parameters and die geometry on the extrusion force and adiabatic temperature rise is investigated. The process is considered to be non-isothermal. The results show that the non-uniform effective strain field inside the workpiece...

article

Impact of Guideline Changes in the Elderly With Early Breast Cancer (BC): Practice Patterns at NCCN Institutions

B. McCormick, R. Ottesen, M. Hughes, S. Javid, more

International Journal of Radiation Oncology*Biology*Physics > 2012 > 84 > 3(S) > S42-S43

article

Preparation of SAPO-34 catalyst and presentation of a kinetic model for methanol to olefin process (MTO)

Niloufar Fatourehchi, Morteza Sohrabi, S. Javid Royaee, S. Mahdi Mirarefin

Chemical Engineering Research and Design > 2011 > 89 > 6 > 811-816

Conversion of methanol to light olefins (MTO) using acidic SAPO-34 molecular-sieve as the reaction catalyst was studied in a differential fixed bed reactor within the temperature range of 375–425°C and under 4bar pressure. The importance of MTO process is due to the increasing demand for light olefins in recent years. SAPO-34 was synthesized by hydrothermal method, applying morpholine as the template...

article

Application of signal processing techniques to ultrasonic testing of plates by S0 Lamb wave mode

S. Javid Mirahmadi, Farhang Honarvar

NDT and E International > 2011 > 44 > 1 > 131-137

In recent years, much attention has been paid to the use of Lamb waves for structural health monitoring. This choice is prompted by the high speed of Lamb wave inspection, although their dispersive nature can complicate the interpretation of results, especially when dealing with closely-spaced reflectors. In this paper, the objective is to improve the time resolution and signal-to-noise ratio of signals...

chapter

The influence of silicon nitride layer parameters on the implied Voc of CZ silicon wafers after annealing

Z. Hameiri, L. Mai, N. Borojevic, S. Javid, more

2009 34th IEEE Photovoltaic Specialists Conference (PVSC) > 1795 - 1800

2009 34th IEEE Photovoltaic Specialists Conference (PVSC 2009)

The passivation potential of PECVD SiN_x deposited on undiffused p-type Si surfaces is investigated. The influence of post-deposition annealing temperature and the film parameters (refractive index and thickness) on the implied Voc of textured, commercial grade, p-type CZ wafers was studied. Improvement in the implied Voc values of SiN_x passivated CZ wafers was observed for two different SiN_x films...

article

Experimental Study of Dynamic Based Feedback Linearization for Trajectory Tracking of a Four-Wheel Autonomous Ground Vehicle

S. Javid, M. Eghtesad, A. Khayatian, H. Asadi

Autonomous Robots > 2005 > 19 > 1 > 27-40

In this paper, experimental study of dynamic based trajectory tracking of an autonomous ground vehicle is presented. The vehicle with two front (steering) and two rear (driving) wheels and also an on-board computer, two DC motors, two batteries and two measurement systems is a good example of an autonomous ground vehicle. The dynamic model of this vehicle is presented in the state-space form with...

article

Effects of gibberellic acid spray on nitrogen yield efficiency of mustard grown with different nitrogen levels

N.A. Khan, R. Mir, M. Khan, S. Javid, more

Plant Growth Regulation > 2002 > 38 > 3 > 243-247

Mustard is cultivated throughout the world for oil in its seeds. Itrequires high nitrogen input for improved productivity but the nitrogen appliedto the soil is not fully utilised by the crops due to various constraints. Theobjective of the reported research was to determine if foliar- appliedgibberellic acid (GA₃) could enhance crop growth and increasenitrogen-use efficiency. A field experiment was...

article

Prefabricated acrylic resin bars for splinting implant transfer copings

Herman B. Dumbrigue, Dincer C. Gurun, Nikzad S. Javid

The Journal of Prosthetic Dentistry > 2000 > 84 > 1 > 108-110

Splinting of implant transfer copings with acrylic resin during impression procedures is performed to accurately transfer the spatial relationships of implants to the master cast. However, distortion may occur during the splinting procedure because of resin polymerization shrinkage. This article describes a simple technique for minimizing this effect by fabrication of resin bars. (J Prosthet Dent...

article

Multi-Stage Rescheduling of Generation, Load Shedding and Short-Term Transmission Capacity for Emergency State Control

Bruce Krogh, S. Javid, Joe Chow

IEEE Transactions on Power Apparatus and Systems > 1983 > PAS-102 > 5 > 1466 - 1472

A multi-stage formulation of the problem of scheduling generation, load shedding and short term transmission capacity for the alleviation of a viability emergency is presented. The formulation includes generation rate of change constraints, a linear network solution, and a model of the short term thermal overload capacity of transmission lines. The concept of rotating transmission line overloads for...

article

Control Design and Performance Analysis of a 6 MW Wind Turbine-Generator

A. Murdoch, J. Winkelman, S. Javid, R. Barton

IEEE Transactions on Power Apparatus and Systems > 1983 > PAS-102 > 5 > 1340 - 1347

This paper discusses an approach to the modeling and performance for the preliminary design phase of a large (6.2 MW) horizontal axis wind turbine generator (WTG). Two control philosophies are presented, both of which are based on linearized models of the WT mechanical and electrical systems. The control designs are compared by showing the performance through detailed non-linear time simulation. The...

article

Control design for a wind turbine-generator using output feedback

S. Javid, A. Murdoch, J. Winkelman

01981 00020th IEEE Conference on Decision and Control including the... > 1981 > 20 > 451 - 457

1981 20th IEEE Conference on Decision and Control including the Symposium on Adaptive Processes

The modeling and approach to control design for a large horizontal axis wind turbine (WT) generator are presented. The control design is based on a suboptimal output regulator which allows coordinated control of WT blade pitch angle and field voltage for the purposes of regulating electrical power and terminal voltage. Results of detailed non-linear simulation tests of this controller are shown.

article

Control of weakly-coupled Markov chains

D. Teneketzis, S. Javid, B. Sridhar

01980 00019th IEEE Conference on Decision and Control including the... > 1980 > 19 > 137 - 142

1980 19th IEEE Conference on Decision and Control including the Symposium on Adaptive Processes

A decomposition of weakly-coupled Markov chains into reduced-order aggregate chains and "fast" chains is derived. This decomposition is used to break an average cost per unit time problem into reduced-order subproblems, the solutions to which provide a near-optimal control. We consider the control of weakly-coupled Markov chains. We decompose this type of Markov chain into a reduced order...

article

Observing the slow states of a singularly perturbed system

S. Javid

01979 00018th IEEE Conference on Decision and Control including the... > 1979 > 18 > 853 - 854

1979 18th IEEE Conference on Decision and Control including the Symposium on Adaptive Processes

This paper considers observers of slow states in singularly perturbed systems. Upper bounds are derived on observer error due to use of a reduced-order model in the observer. This error is shown to be 0(?), where the singular perturbation parameter ? is a measure of the separation between the slow and fast elgenvalues of the full-order system.

article

The time-optimal control of a class of nonlinear systems

S. Javid, P. Kokotovic

01978 IEEE Conference on Decision and Control including the 00017th... > 1978 > 17 > 855 - 861

1978 IEEE Conference on Decision and Control including the 17th Symposium on Adaptive Processes

The time-optimal control of a class of nonlinear singularly perturbed systems possesses the two time-scale property that the optimal control is made of a control in a slow-time scale followed by a control in a fast time-scale. Based on this property a near time-optimal control is defined. Two examples illustrating the computation of the near-optimal control and a simple iterative technique are presented.

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