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Mahjoob, Raheleh,Nafchi, Abdorreza Mohammadi,Amiri, Elahe Omidbakhsh,Farmani, Jamshid 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.2
In this study, the effect of interesterification (using sodium methoxide) on physicochemical characteristics of fully hydrogenated palm olein (FHPO)/soybean oil blends (10 ratios) was investigated. Interesterification changed free fatty acid content, decreased oil stability index, solid fat content (SFC) and slip melting point (SMP), and does not affected the peroxide value. With the increase of FHPO ratio, oil stability index, SFC and SMP increased in both the interesterified and non-interesterified blends. Fats with higher FHPO ratio had narrower plastic range, as well. Compared to the initial blends, interesterified fats had wider plastic ranges at lower temperatures. Both the non-interesterified and interesterified blends showed monotectic behavior. The Gompertz function could describe SFC curve (as a function of temperature, saturated fatty acid (SFA) content or both) and SMP (as a function of SFA) of the interesterified fats with high $R^2$ and low mean absolute error.
Raheleh Mahjoob,Abdorreza Mohammadi Nafchi,Elahe Omidbakhsh Amiri,Jamshid Farmani 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.2
In this study, the effect of interesterification (using sodium methoxide) on physicochemical characteristics of fully hydrogenated palm olein (FHPO)/soybean oil blends (10 ratios) was investigated. Interesterification changed free fatty acid content, decreased oil stability index, solid fat content (SFC) and slip melting point (SMP), and does not affected the peroxide value. With the increase of FHPO ratio, oil stability index, SFC and SMP increased in both the interesterified and non-interesterified blends. Fats with higher FHPO ratio had narrower plastic range, as well. Compared to the initial blends, interesterified fats had wider plastic ranges at lower temperatures. Both the non-interesterified and interesterified blends showed monotectic behavior. The Gompertz function could describe SFC curve (as a function of temperature, saturated fatty acid (SFA) content or both) and SMP (as a function of SFA) of the interesterified fats with high R2 and low mean absolute error.
Isa Khaheshi,Mohammad Parsa Mahjoob,Shooka Esmaeeli,Vahid Eslami,Habib Haybar 대한심장학회 2015 Korean Circulation Journal Vol.45 No.2
This case report underscores that crystal methamphetamine abuse is an important cause of multivessel coronary thrombosis and raisesdoubts about the therapeutic options. The patient was a 34-year-old smoker and crystal methamphetamine abuser with no significantmedical history, who presented with retrosternal chest pain associated with cold sweats. Twelve-lead electrocardiogram revealed diffuseST-segment elevation in I, II, AVL, AVF, and V 2–6 leads. He underwent urgent coronary angiography and it showed Thrombolysis in MyocardialInfarction (TIMI) grade 3 flow in coronary arteries and presence of a thrombus in the left anterior descending artery (LAD) and the rightcoronary artery (RCA). The patient underwent medical therapy with antiplatelet agents and anticoagulants. Repeat coronary angiographyafter three months of dual therapy with warfarin and aspirin did not show any thrombus or any significant lesion in the RCA and the LADhaving TIMI grade 3 flow.
N. Mohammadi,M. J. Mahjoob,B. Kaffashi,S. Malakooti 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.9
The rheological behavior of field-dependent smart fluids in both the pre-yield and post-yield regimes is investigated. Typical viscoelastic and viscoplastic models are employed to model the fluids behavior. Viscoelastic models are used widely in the pre-yield regime. Viscoplastic models are also used extensively in both the pre-yield and post-yield regimes. Two smart fluids including a ferromagnetic nanoparticle fluid and an MR fluid are examined here. Using an MCR300 rheometer, the rheological properties of the fluids in both oscillation and rotational mode are measured. In the oscillation mode, the storage and loss moduli versus frequency are measured. In the rotational mode, shear stress, shear rate, viscosity and torque are measured. In the frequency domain, the pre-yield behavior of the ferromagnetic nano-particle fluid is modeled by Kelvin-Voigt solid model. Also, the three-parameter fluid model is used to model the pre-yield behavior of the MR fluid. Two viscoplastic models including Bingham-plastic and Herschel-Bulkley models are selected to model the rheological behavior of fluids in the time domain. Which model is more appropriate depends on the external magnetic field and the shear rate. Both models are used here to model the fluids’ behavior. The models properly predict the results observed in the experiments.
M. Roozegar,M. J. Mahjoob,M. Ayati 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.2
An adaptive approach is developed for the tracking control of a pendulum-driven spherical robot. First, the dynamics model of the robot is derived using Newton-Euler methodology for a system of rigid bodies. The simplified model is marginally stable and nonminimum phase. Next, based on the theory of the model-reference adaptive system, a Model-reference adaptive controller (MRAC) is designed to track the desired command signals. The controller parameters are adjusted based on the error between the reference model and the process outputs and the command signals. Simulations illustrate that the convergence rate depends substantially on the adaptation gains of the MRAC. Hence, gains should be tuned properly by using fuzzy logic systems or a genetic algorithm. Results indicate that the proposed control strategy is highly promising for tracking different command signals even if the system is non-minimum phase and marginally stable. Moreover, this controller is more easily implemented in the real world compared with nonlinear controllers.
Esmaeel A. Bagherpour,Mohammad-Reza Ha’iri-Yazdi,Mohammad J. Mahjoob 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12
In this paper, we deal with residual vector generation for fault detection problems in linear systems via unknown input observer (UIO)when the so-called observer matching condition is not satisfied. Based on the relative degree between unknown input and output, a vectorof the auxiliary output is introduced so that the observer matching condition is satisfied with respect to the vector. Auxiliary outputs arerelated to the derivatives of measured signals. However, differentiation leads to excessive amplification of measurement noise. A dynamicallyequivalent configuration of linear systems is developed using successive integrations to avoid differentiation. As such, auxiliaryoutputs are constructed without differentiation. Then, the equivalent dynamic system and its corresponding auxiliary outputs are used togenerate the residual vector via an exponentially converging UIO. Fault detection in the generated residual vector is also investigated. Finally, the effectiveness of the proposed method is shown via numerical simulation.