Stable Extended Imaging Area Sensing Without Mechanical Movement Based on Spatial Frequency Multiplexing

Tayebi, Behnam,Sharif, Farnaz,Karimi, Ali,Han, Jae-Ho Institute of Electrical and Electronics Engineers 2018 IEEE transactions on industrial electronics Vol.65 No.10

<P>Testing process in industrial profiling depends on the characterization of three-dimensional (3-D) objects with high sensitivity in spatial and temporal domains. Ordinary 3-D measurement instruments scan the image area in the temporal domain; therefore, these techniques experience low temporal stability especially for industrial and biomedical sensing. We propose a novel scan-free extended image instrument for sensing the area of 3-D microscopic objects using an interferometric technique with fixed optical parameters, such as resolution, and without mechanical movement. The technique could accelerate the control process in industrial fault detection and images of biological samples could be obtained in a shorter time. First, a stable system for doubling the image area is introduced. Second, the principles underlying the two-dimensional sampling scheme are introduced to record the maximum image area using a dual multiplexing technique at subsampling frequency. Moreover, a standard factor is presented as a figure of merit to determine the exact image area enhancement. Finally, the feasibility of this technique was demonstrated by sensing reflective and transparent objects with image area of up to 4.3-times that of a single-hologram recording using the square scheme. Furthermore, scan-free monitoring of the photolithography process was demonstrated in real-time. The standard deviation of thickness is 0.48 nm, which demonstrates the subnanometer temporal sensitivity of this technique.</P>

ON THE SECOND APPROXIMATE MATSUMOTO METRIC

Tayebi, Akbar,Tabatabaeifar, Tayebeh,Peyghan, Esmaeil Korean Mathematical Society 2014 대한수학회보 Vol.51 No.1

In this paper, we study the second approximate Matsumoto metric F = ${\alpha}+{\beta}+{\beta}^2/{\alpha}+{\beta}^3/{\alpha}^2$ on a manifold M. We prove that F is of scalar flag curvature and isotropic S-curvature if and only if it is isotropic Berwald metric with almost isotropic flag curvature.

Real-Time Triple Field of View Interferometry for Scan-Free Monitoring of Multiple Objects

Tayebi, Behnam,Kim, Wonju,Yoon, Bong-June,Han, Jae-Ho IEEE 2018 IEEE/ASME transactions on mechatronics Vol.23 No.1

<P>Synchronous scanning of multiple objects is essential to health monitoring of cells with high reliability. In general, monitoring multiple objects with fixed optical resolution in a total area larger than the sensor size of the camera requires asynchronous scanning; therefore, the recorded images of different scanned areas are asynchronous. We have developed a novel single-shot triple field of view (FOV) interferometric technique that rectifies this asynchronous problem and the effect of high-frequency noise due to the motorized scanning components utilized to extend imaging area. The proposed technique is a novel setup, calibration, and correction algorithm that facilitates a wider 3-D imaging area and higher mechanical stability with fixed imaging parameters. In addition, objects are exposed to a low-power light source and images can be formed with lower intensity light, which is important for sensitive objects in practical applications. The technique separates the light exiting a microscope using four mirrors, which results in all beams having the same intensity and the recorded image possessing a higher fringe contrast than with techniques that use beam splitters. Furthermore, the arrangement it adopts, in which a pinhole is employed to produce a clear reference beam, makes it appropriate for complex industrial fabrication monitoring. A sub-Nyquist sampling scheme is also employed to facilitate recording of the maximum possible FOV for single-shot three holograms recording, and the phase retrieval process is modified to refocus the beam on different image planes. The feasibility of the proposed technique for monitoring multiple biological cells with different morphologies is demonstrated by using it to image human embryonic kidney 293 cells.</P>

Reduced-phase dual-illumination interferometer for measuring large stepped objects.

Tayebi, Behnam,Jafarfard, Mohammad Reza,Sharif, Farnaz,Bae, Yoon Sung,Shokuh, Seyyed Hossein Hosseini,Kim, Dug Young Optical Society of America 2014 Optics letters Vol.39 No.19

<P>We present a reduced-phase dual-illumination interferometer (RPDII) that measures the topography of a sample with large step height variation. We experimentally demonstrate the basic principle and the feasibility of this novel single-shot quantitative phase imaging. Two beams of this interferometer illuminate a sample at different incident angles, and two phases of the different incident angles and their phase difference are simultaneously recorded using three spatial frequencies. The relative phase difference between two beams of an RPDII can be controlled by adjusting the angle such that the maximum phase difference is smaller than 2π, and thus there is no phase wrapping ambiguity in the reconstructed phase. One 4f optical system with a transmission grating is used to illuminate the sample with two collimated beams incident at different angles. The feasibility of this technique is demonstrated by measuring the thicknesses of two stepped metal layers with heights of 150 and 660 μm. Although the change in stepped height is more than 1000 times the wavelength of the laser used in our interferometer, the thicknesses of these two metal layers are successfully obtained without the use of an unwrapping algorithm.</P>

Compact single-shot four-wavelength quantitative phase microscopy with polarization- and frequency-division demultiplexing

Tayebi, Behnam,Han, Jae-Ho,Sharif, Farnaz,Jafarfard, Mohammad Reza,Kim, Dug Young The Optical Society 2017 Optics express Vol.25 No.17

Large step-phase measurement by a reduced-phase triple-illumination interferometer.

Tayebi, Behnam,Jafarfard, Mohammad Reza,Sharif, Farnaz,Song, Young Sik,Har, Dongsoo,Kim, Dug Young Optical Society of America 2015 Optics express Vol.23 No.9

<P>We present a reduced-phase triple-illumination interferometer (RPTII) as a novel single-shot technique to increase the precision of dual-illumination optical phase unwrapping techniques. The technique employs two measurement ranges to record both low-precision unwrapped and high-precision wrapped phases. To unwrap the high-precision phase, a hierarchical optical phase unwrapping algorithm is used with the low-precision unwrapped phase. The feasibility of this technique is demonstrated by measuring a stepped object with a height 2100 times greater than the wavelength of the source. The phase is reconstructed without applying any numerical unwrapping algorithms, and its noise level is decreased by a factor of ten.</P>

Improved photoelectrochemical performance of molybdenum (Mo)-doped monoclinic bismuth vanadate with increasing donor concentration

Tayebi, Meysam,Tayyebi, Ahmad,Lee, Byeong-Kyu Elsevier Science Publishers 2019 Catalysis today Vol.328 No.-

<P><B>Abstract</B></P> <P>Molybdenum (Mo)-doped Monoclinic Bismuth Vanadate (Mo-BiVO<SUB>4</SUB>; BVO) catalysts were fabricated via a simple dip coating method. We systematically studied the effect of Mo-doping with various concentration (1–5%) in BVO electrode through photoelectrochemical (PEC), Mott-Schottky and impedance measurement. Intermediate heat treatment and number of successive dip coating deposition were utilized to control the monoclinic crystallization and thickness of Mo-BVO photoanodes. Furthermore, the effect of Mo-doping in morphology, structure, chemical states and optical properties of the obtained electrodes were characterized by different physico-chemical and morphological methods BVO with 2% Mo doping (2% Mo-BVO) showed the best PEC performance, of about 15 times higher than that of the pure BVO. Improved charge carrier transport and optimized light absorption obtained upon Mo doping into the BVO crystal lattice while the monoclinic scheelite structure with small band-gap was retained. To understand the effect of Mo-doping, Mott Schottky and Impedance measurement carried out, in order to evaluate the donor concentration and conductivity of pure BVO and Mo-BVO. Interestingly, 2% Mo-BVO showed the maximum donor concentration (5.7E + 27) and minimum flat band potential (V<SUB>fb</SUB> = −0.45) compared to other prepared electrodes. Furthermore, we attempt to discuss the improved PEC performance of Mo-BVO using high donor concentration, up-shifting of Fermi level and consequently facilitating electrons transport in Mo-BVO compared to pure BVO.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mo-BVO electrodes were fabricated via a four dip-coating cycles method. </LI> <LI> Photocurrent density increased 15-fold for 2% Mo-BVO compared with pure BVO. </LI> <LI> Mott-Schottky results indicated 2% Mo-BVO has the maximum donor concentration. </LI> <LI> The PEC measurement showed shifting of onset potential to lower voltage for Mo-BVO. </LI> <LI> The Impedance data exhibited 2% Mo-BVO has the best PEC performance compared to other photoanodes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Study effect of 2D matterial (MoS₂) on WO₃ semiconductor for improving photoelectrochemical waster splitting

Meysam Tayebi,Byeong-Kyu Lee 대한환경공학회 2019 대한환경공학회 학술발표논문집 Vol.2019 No.-

Extensive Acute Lower Extremity Arterial Thrombosis: A Major Thrombus Formation Caused by COVID-19

Pouya Tayebi,Mahmoud Sadeghi Haddad Zavareh,Gooya Tayyebi,Fatemeh Zahra Abdollahi,Fatemeh Mahmoudlou 대한혈관외과학회 2021 Vascular Specialist International Vol.37 No.4

Acute thromboembolic events have been frequently reported in patients with coronavirus disease 2019 (COVID-19) due to an increase in the coagulation system activity and endothelial dysfunction. This report describes a patient with COVID-19 who initially reported respiratory symptoms and developed acute lower limb ischemia secondary to extensive macrovascular arterial thrombosis, which was treated with thrombectomy. The development of such extensive arterial thrombosis with anticoagulants at therapeutic doses is a new sign of increased viral pathogenicity, and it is necessary to develop and apply updated prophylaxis protocols for thrombosis in these patients.

The effect of additives on the properties of HAp-Al2O3 nano-composite powders

S. Tayebi,F. Mirjalili,H. Samadi,A. Nemati 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.10

Hydroxyapatite is the most important bio ceramic, due to its structure and chemical composition which is similar to bone. Since feeble fracture toughness, brittleness and low tensile strength have restricted their use, for overcoming this problem, theywere often used as a secondary component. HAp-Al2O3 nano-composite powder combined the benefits of biocompatibility ofHAp and high strength of Al2O3. When HAp-Al2O3nano-composite powders were sintered at a higher temperature than 1100-1200 oC, HAp was decomposed and converted to the second phase of TCP, due to the formation of calcium aluminateincreasing decomposition speed of HAp to TCP at higher degree than 1100-1200 oC temperatures; therefore, with the additionof additives to the powders, the decomposition reaction of HAp could be inhibited and the properties could be improved. Inthis study the effects of alumina as reinforcement, pH, surfactant and different additives were investigated. At first,hydroxyapatite powder was synthesized. Then, the effect of different percentage of alumina (15, 20, 25), different pHs (9, 10,11), different surfactants and different additives on HAp-Al2O3 nano-composite powder were studied. The results showed thatthe addition of different additives resulted in increase of the thermal stability and properties of HAp-Al2O3nano compositepowder. By replacement of Cl− and F−ions with OHinHAp structure, decomposition of HAp decreased and stability of HApat higher temperatures was increased. Owing to the decomposition of HAp, the reaction between CaO and Al2O3 reduced;therefore, the amount of calcium alumina phases decreased something which resulted in Al2O3 phase. Moreover, replacementof Cl−and F−ions in the apatite structure limited the growth of the grains and decreased the crystallinity that led to a bettersolubility and bioactivity behavior of nano composite powder.