Non-invasive blood pressure estimation using phonocardiogram

, Article Proceedings - IEEE International Symposium on Circuits and Systems, 28 May 2017 through 31 May 2017 ; 2017 ; 02714310 (ISSN) ; 9781467368520 (ISBN) Esmaili Dastjerdi, A ; Kachuee, M ; Shabany, M ; Sharif University of Technology

2017

Abstract

This paper presents a novel approach based on pulse transit time (PTT) for the estimation of blood pressure (BP). In order to achieve this goal, a data acquisition hardware is designed for high-resolution sampling of phonocardiogram (PCG) and photoplethysmogram (PPG). These two signals can derive PTT values. Meanwhile, a force-sensing resistor (FSR) is placed under the cuff of the BP reference device to mark the moments of measurements accurately via recording instantaneous cuff pressure. For deriving the PTT-BP models, a calibration procedure including a supervised physical exercise is conducted for each individual. The proposed method is evaluated on 24 subjects. The final results prove...

Non-invasive and Continuous Blood Pressure Measurement Using Pulse Transit Time without Cuff Requirement

, M.Sc. Thesis Sharif University of Technology Esmaili Dastjerdi, Amir Hossein (Author) ; Shabany, Mahdi (Supervisor)

Abstract

This thesis addresses cuff-less blood pressure (BP) estimation, for systolic blood pressure (SBP) and diastolic blood pressure (DBP) estimation with the aid of the processing of vital signals. Both with and without calibration per person approaches for BP estimation are considered. A data acquisition hardware is designed for high-resolution sampling of phonocardiogram (PCG), Photoplethysmogram (PPG) and electrocardiogram (ECG). Using these signals, pulse transit time (PTT) and pulse arrival time (PAT) indexes, which would be used for BP estimation with calibration, are extracted. For the BP estimator model using the calibration, A nonlinear model based on PTT or PAT, via modeling the vessels...

The dynamics of wettability driven droplets in smooth and corrugated microchannels

, Article Journal of Statistical Mechanics: Theory and Experiment ; Volume 2012, Issue 10 , 2012 ; 17425468 (ISSN) Esmaili, E ; Moosavi, A ; Mazloomi, A ; Sharif University of Technology

IOP 2012

Abstract

A multi-component lattice Boltzmann scheme is used to investigate the dynamics of a wettability driven droplet within a microchannel. The driving force for the motion is created by a stepwise change in the wettability of the channel walls. Moreover, an analytical solution is developed for evaluation of the dynamics of the droplet inside the channel. The effects of various parameters such as the height of the channel, the wetting pattern of the channel walls, the viscosity and the density ratio on the dynamics are studied. Also, the effect of grooves of different sizes on the channel surfaces on the dynamics of the droplet is investigated for both hydrophilic and hydrophobic surfaces....

Gravity-driven thin liquid films over topographical substrates

, Article European Physical Journal E ; Volume 36, Issue 6 , 2013 ; 12928941 (ISSN) Mazloomi, A ; Moosavi, A ; Esmaili, E ; Sharif University of Technology

2013

Abstract

We investigate the time-dependent evolution of thin liquid films over inclined substrates using a multi-component lattice Boltzmann algorithm. Substrates with and without grooves are considered and the effects of the inclination angle on the dynamics and the coating of the substrates are studied. Our results indicate that the dynamics is enhanced and the ridge height and its displacement are increased by increasing the inclination angle. However, by increasing the inclination angle the maximum depth that can be successfully coated is reduced. Also, although for any given groove depth the width should be larger than a critical value for successful coating, the critical width decreases for...

A low-power high-speed comparator for analog to digital converters

, Article 2016 IEEE International Symposium on Circuits and Systems, ISCAS 2016, 22 May 2016 through 25 May 2016 ; Volume 2016-July , 2016 , Pages 2010-2013 ; 02714310 (ISSN); 9781479953400 (ISBN) Khorami, A ; Baraani Dastjerdi, M ; Fotowat Ahmadi, A ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2016

Abstract

A low-power high-speed two-stage dynamic comparator is presented. In this circuit, PMOS transistors are used at the input of the first and second stages of the comparator. At the evaluation phase, the second stage is activated after the first stage with a predetermined delay to achieve a controllable pre-amplifier gain. Also, the first stage is turned off after the delay to reduce overall power consumption. Simulation results in 0.18 μτη CMOS technology, prove that the proposed circuit reduces the power consumption by a factor of two and reduces comparison time as large as 210ps in the same budget of offset voltage compared to the conventional circuit. Moreover, the offset voltage and power...

Possible pitfalls in pressure transient analysis: Effect of adjacent wells

, Article Journal of Petroleum Exploration and Production Technology ; Volume 9, Issue 4 , 2019 , Pages 3023-3038 ; 21900558 (ISSN) Mirzaalian Dastjerdi, A ; Eyvazi Farab, A ; Sharifi, M ; Sharif University of Technology

Springer Verlag 2019

Abstract

Abstract: Well testing is one of the important methods to provide information about the reservoir heterogeneity and boundary limits by analyzing reservoir dynamic responses. Despite the significance of well testing data, misinterpreted data can lead us to a wrong reservoir performance prediction. In this study, we focus on cases ignoring the adjacent well’s production history, which may lead to misinterpretation. The analysis was conducted on both homogeneous and naturally fractured reservoirs in infinite-acting and finite-acting conditions. The model includes two wells: one is “tested well” and the other is “adjacent one.” By studying different scenarios and focusing on derivative plots, it...

Pseudo-dirac neutrino scenario: Cosmic neutrinos at neutrino telescopes

, Article Physical Review D - Particles, Fields, Gravitation and Cosmology ; Volume 81, Issue 1 , 2010 ; 15507998 (ISSN) Esmaili, A ; Sharif University of Technology

2010

Abstract

Within the "pseudo-Dirac" scenario for massive neutrinos the existence of sterile neutrinos which are almost degenerate in mass with the active ones is hypothesized. The presence of these sterile neutrinos can affect the flavor composition of cosmic neutrinos arriving at Earth after traveling large distances from astrophysical objects. We examine the prospects of neutrino telescopes such as IceCube to probe the very tiny mass squared differences 10-12eV2>Δm2>10-19eV2, by analyzing the ratio of μ-track events to showerlike events. Considering various sources of uncertainties which enter this analysis, we examine the capability of neutrino telescopes to verify the validity of the pseudo-Dirac...

Cosmic neutrinos at IceCube: θ13, δ and initial flavor composition

, Article Journal of Physics: Conference Series ; Volume 203 , 2010 ; 17426588 (ISSN) Esmaili, A ; Sharif University of Technology

2010

Abstract

We discuss the prospect of extracting the values of the mixing parameters δ and θ13 through the detection of cosmic neutrinos in the planned and forthcoming neutrino telescopes. We take the ratio of the μ-track to shower-like events, R, as the realistic quantity that can be measured in the neutrino telescopes. We take into account several sources of uncertainties that enter the analysis. We then examine to what extent the deviation of the initial flavor composition from we : w μ : wτ 1 : 2 : 0 can be tested

Asphaltene aggregation under the influence of structural features and interaction energies: Combination of quantum mechanical and molecular dynamics approaches

, Article Colloids and Surfaces A: Physicochemical and Engineering Aspects ; Volume 671 , 2023 ; 09277757 (ISSN) Vahid Dastjerdi, M ; Sayahi, H ; Koochaki, A ; Jamshidi, Z ; Sharif University of Technology

Elsevier B.V 2023

Abstract

The importance of the model to predict the aggregation behavior of asphaltene molecules at the molecular level was well established in different studies. Elucidation of the relationship between the interaction energy and the structural characteristics of asphaltene molecules to their aggregation behavior still needs further investigation. For this purpose, we combined the quantum mechanics and molecular dynamics approaches and analyzed the interaction energy of asphaltene to find out the effect of structural features on the aggregation behavior. The interaction energy of asphaltene is used in this study to evaluate the potential of aggregation. We found that asphaltene molecules with smaller...

Synthesis of highly functionalized quinazoline-2,4(1H,3H)-diones from isocyanides, aniline and isocyanate via Cu-catalyzed intermolecular C-H activation reactions

, Article Letters in Organic Chemistry ; Volume 17, Issue 11 , 2020 , Pages 832-836 Nematpour, M ; Fasihi Dastjerdi, H ; Jahani, M ; Tabatabai, S. A ; Sharif University of Technology

Bentham Science Publishers 2020

Abstract

A simple and appropriate procedure for the synthesis of quinazoline-2,4(1H,3H)-dione derivatives from isocyanides, aniline and isocyanate via the Cu-catalyzed intramolecular C-H activation reaction is reported. The advantages of this method are one-pot conditions, accessible starting materials-catalyst, high yield of products, and short reaction times. The structures are confirmed spectroscopically (1H-and13C-NMR, IR and EI-MS) and by elemental analyses. © 2020 Bentham Science Publishers

Determination of the linear behavior of FC detectors in Isfahan MNSR using ex-core offline and online experiments

, Article Nuclear Engineering and Design ; Volume 415 , 2023 ; 00295493 (ISSN) Asgari, A ; Hosseini, A ; Choopan Dastjerdi, M. H ; Mokhtari, J ; Sharif University of Technology

Elsevier Ltd 2023

Abstract

The linear behavior of fission chamber (FC) neutron detectors in Isfahan miniature neutron source reactor (MNSR) was investigated experimentally. FC neutron detectors are installed near the reactor core to measure the produced neutron flux in the core. The linearity of the response of these detectors is important because the measured neutron flux by them is one of the important methods in determining and controlling the reactor power and therefore affects the safety of the reactor. For this purpose, the measured neutron fluxes by these detectors at different reactor powers were compared with the measured neutron flux at the output of the external beam tubes by different methods. In this...

Evaluation of test collection construction methods: A case study

, Article 2008 International Conference on Information and Knowledge Engineering, IKE 2008, Las Vegas, NV, 14 July 2008 through 17 July 2008 ; January , 2008 , Pages 16-22 ; 1601320752 (ISBN); 9781601320759 (ISBN) Sheykh Esmaili, K ; Hosseini, M ; Rostami, A ; Abolhassani, H ; Sharif University of Technology

2008

Abstract

Currently there is no standard test collection for evaluation of Farsi information retrieval systems. In this paper we introduce Mahak, the first complete test collection generally available for evaluating Farsi information retrieval systems. In addition, we have used different methods for constructing Mahak qrels and we have compared performance of these methods

Oscillation of neutrinos produced by the annihilation of dark matter inside the Sun

, Article Physical Review D - Particles, Fields, Gravitation and Cosmology ; Volume 81, Issue 11 , June , 2010 ; 15507998 (ISSN) Esmaili, A ; Farzan, Y ; Sharif University of Technology

2010

Abstract

The annihilation of dark matter particles captured by the Sun can lead to a neutrino flux observable in neutrino detectors. Considering the fact that these dark matter particles are nonrelativistic, if a pair of dark matter annihilates to a neutrino pair, the spectrum of neutrinos will be monochromatic. We show that in this case, even after averaging over the production point inside the Sun, the oscillatory terms of the oscillation probability do not average to zero. This leads to interesting observable features in the annual variation of the number of muon track events. We show that smearing of the spectrum due to thermal distribution of dark matter inside the Sun is too small to wash out...

A new class of invariants in the lepton sector

, Article Nuclear Physics B ; Volume 811, Issue 1-2 , 2009 , Pages 98-108 ; 05503213 (ISSN) Esmaili, A ; Farzan, Y ; Sharif University of Technology

2009

Abstract

We construct a new set of combinations from the mass matrices of the charged leptons and neutrinos that are invariant under basis transformation, hereafter the invariants. We use these invariants to study various symmetries and neutrino mass textures in a basis independent way. In particular, we show that by using these invariants the ansatz such as μ - τ exchange and reflection symmetries, various texture zeros and flavor symmetries can be expressed in a general basis. © 2008 Elsevier B.V. All rights reserved

An analysis of cosmic neutrinos: flavor composition at source and neutrino mixing parameters

, Article Nuclear Physics B ; Volume 821, Issue 1-2 , 2009 , Pages 197-214 ; 05503213 (ISSN) Esmaili, A ; Farzan, Y ; Sharif University of Technology

2009

Abstract

We examine the feasibility of deriving neutrino mixing parameters δ and θ13 from the cosmic neutrino flavor composition under the assumption that the flavor ratios of the cosmic neutrinos at the source were Fνe + Fover(ν, ̄)e : Fνμ + Fover(ν, ̄)μ : Fντ + Fover(ν, ̄)τ = 1 : 2 : 0. We analyze various uncertainties that enter the derivation of δ and θ13 from the ratio of the shower-like to μ-tracks events which is the only realistic source of information on the flavor composition at neutrino telescopes such as ICECUBE. We then examine to what extent the deviation of the initial flavor ratio from 1 : 2 : 0 can be tested by measurement of this ratio at neutrino telescopes taking into account...

Analytical and Numerical Study of Dynamics of Wettability Driven Droplets in Smooth And Corrugated Channels

, M.Sc. Thesis Sharif University of Technology Esmaili, Ehsan (Author) ; Moosavi, Ali (Supervisor)

Abstract

We studied dynamics of droplets inside channels under surface forces created by chemicalsteps on the channel walls. A multi-component Shan-Chen lattice Boltzmann method isused for this purpose.The effects of parameters such as the channel height, viscosity anddensity ratios on the results were investigated for homogeneous and grooved substrates. Alsoan analytical solution was developed for droplets under chemical heterogeneities in channels with smooth surfaces. The solution considers a general condition, namely, asymmetry of the contact angles on the top and bottom walls, the viscosity of the gas as the second fluid and the effect of the channel height. Then using Shan-Chen lattice...

Existence and Uniqueness of Solution for Two Free Boundary Problems Modelling Tumor Growth

, M.Sc. Thesis Sharif University of Technology Esmaili, Sakine (Author) ; Hesaaraki, Mahmoud (Supervisor)

Abstract

This thesis is based on articles [18,15]. Zhao [18] has studied a free boundary problem modeling the growth of tumors with drug application. In this model live cells are two kindes: proliferative cells and quiescent cells. This model consists of two nonlinear second-order parabolic equations describing the diﬀusion of nutrient and drug concentration, and three nonlinear ﬁrst-order hyperbolic equations describing the evolution of proliferative cells, quiescent cells and dead cells. He has proved that this free boundary problem has a unique global solution. Tao and Chen [15] have studied another free boundary problem modelling the growth of an avascular tumour with drug application. The...

One-pot synthesis of highly functionalized benzo [1,3] thiazine from isocyanides, aniline, and heterocumulene via Cu-catalyzed intramolecular C-H activation reactions

, Article Journal of the Chinese Chemical Society ; Volume 66, Issue 11 , 2019 , Pages 1537-1541 ; 00094536 (ISSN) Dastjerdi, H. F ; Nematpour, M ; Rezaee, E ; Jahani, M ; Tabatabai, S. A ; Sharif University of Technology

Chinese Chemical Society Taiwan 2019

Abstract

A one-pot synthesis of functionalized benzo thiazine derivatives via a Cu-catalyzed, multicomponent reaction of isocyanides, aniline, and heterocumulenes in acetonitrile at room temperature was developed. Transition metal-catalyzed activation of C-H bonds under mild copper-catalytic reaction conditions, using simple and available starting materials, also obtaining a pure product with high yield without applying column chromatography are the major advantages of the applied method among the other ones used for this purpose. The structures are confirmed spectroscopically (1H- and 13C-NMR, IR, and EI-MS) and through elemental analyses. © 2019 The Chemical Society Located in Taipei & Wiley-VCH...

A novel copper-catalyzed synthesis of n-monosubstituted 2-alkynimi-damides from 1-alkynes and trichloroacetamidines

, Article Letters in Organic Chemistry ; Volume 17, Issue 9 , 2020 , Pages 704-708 Fasihi Dastjerdi, H ; Nematpour, M ; Rezaee, E ; Jahani, M ; Tabatabai, S. A ; Sharif University of Technology

Bentham Science Publishers 2020

Abstract

A one-pot Cu-catalyzed synthesis of functionalized alkynyl imidamide by terminal alkynes, trichloroacetonitrile and aniline or benzyl amine is reported. The compounds were produced via coupling reaction of terminal alkynes with trichloroacetamidine. This method was performed under mild, ligand-free conditions and easy work-up method. © 2020, Bentham Science Publishers. All rights reserved

Predicting Expert Rank Range In Expert Retrieval

, M.Sc. Thesis Sharif University of Technology Baraani Dastjerdi, Alireza (Author) ; Beigy, Hamid (Supervisor)

Abstract

Expert retrieval when the number of experts are limited is an open problem. Undoubtedly, becoming an expert in a field is a time consuming and expensive task; thus finding the best candidates is a crucial task. In addition, passage of time and growth of knowledge could change the view of a person towards life and his work, which may lead to the change of his or her field of work. When considering the changes each person makes in his or her life, it becomes obvious that they are not far from the original status. Therefore, recommending all possible options around a person could really help the task of decision making. This research is addressing two similar issues of finding experts, in a...