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  1. Article: Effect of chemical passivation on corrosion behavior and ion release of a commercial chromium-cobalt alloy.

    Moslehifard, Elnaz / Ghaffari, Tahereh / Mohammadian-Navid, Samineh / Ghafari-Nia, Mina / Farmani, Amirali / Nasirpouri, Farzad

    Journal of dental research, dental clinics, dental prospects

    2020  Volume 14, Issue 3, Page(s) 171–176

    Abstract: Background. ...

    Abstract Background.
    Language English
    Publishing date 2020-09-21
    Publishing country Iran
    Document type Journal Article
    ZDB-ID 2514725-0
    ISSN 2008-2118 ; 2008-210X
    ISSN (online) 2008-2118
    ISSN 2008-210X
    DOI 10.34172/joddd.2020.037
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Associations between light exposure and sleep timing and sleepiness while awake in a sample of UK adults in everyday life.

    Didikoglu, Altug / Mohammadian, Navid / Johnson, Sheena / van Tongeren, Martie / Wright, Paul / Casson, Alexander J / Brown, Timothy M / Lucas, Robert J

    Proceedings of the National Academy of Sciences of the United States of America

    2023  Volume 120, Issue 42, Page(s) e2301608120

    Abstract: Experimental and interventional studies show that light can regulate sleep timing and sleepiness while awake by setting the phase of circadian rhythms and supporting alertness. The extent to which differences in light exposure explain variations in sleep ...

    Abstract Experimental and interventional studies show that light can regulate sleep timing and sleepiness while awake by setting the phase of circadian rhythms and supporting alertness. The extent to which differences in light exposure explain variations in sleep and sleepiness within and between individuals in everyday life remains less clear. Here, we establish a method to address this deficit, incorporating an open-source wearable wrist-worn light logger (SpectraWear) and smartphone-based online data collection. We use it to simultaneously record longitudinal light exposure (in melanopic equivalent daylight illuminance), sleep timing, and subjective alertness over seven days in a convenience sample of 59 UK adults without externally imposed circadian challenge (e.g., shift work or jetlag). Participants reliably had strong daily rhythms in light exposure but frequently were exposed to less light during the daytime and more light in pre-bedtime and sleep episodes than recommended [T. M. Brown
    MeSH term(s) Adult ; Humans ; Wakefulness ; Sleepiness ; Sleep/physiology ; Circadian Rhythm/physiology ; United Kingdom ; Melatonin
    Chemical Substances Melatonin (JL5DK93RCL)
    Language English
    Publishing date 2023-10-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2301608120
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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    Jg. 1995 - 2021: Lesesall (1.OG)
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  3. Article: A Wrist-Worn Internet of Things Sensor Node for Wearable Equivalent Daylight Illuminance Monitoring.

    Mohammadian, Navid / Didikoglu, Altug / Beach, Christopher / Wright, Paul / Mouland, Joshua W / Martial, Franck P / Johnson, Sheena / van Tongeren, Martie / Brown, Timothy M / Lucas, Robert J / Casson, Alexander J

    IEEE internet of things journal

    2024  Volume 11, Issue 9, Page(s) 16148–16157

    Abstract: Light exposure is a vital regulator of physiology and behavior in humans. However, monitoring of light exposure is not included in current wearable Internet of Things (IoT) devices, and only recently have international standards defined [Formula: see ... ...

    Abstract Light exposure is a vital regulator of physiology and behavior in humans. However, monitoring of light exposure is not included in current wearable Internet of Things (IoT) devices, and only recently have international standards defined [Formula: see text] -optic equivalent daylight illuminance (EDI) measures for how the eye responds to light. This article reports a wearable light sensor node that can be incorporated into the IoT to provide monitoring of EDI exposure in real-world settings. We present the system design, electronic performance testing, and accuracy of EDI measurements when compared to a calibrated spectral source. This includes consideration of the directional response of the sensor, and a comparison of performance when placed on different parts of the body, and a demonstration of practical use over 7 days. Our device operates for 3.5 days between charges, with a sampling period of 30 s. It has 10 channels of measurement, over the range 415-910 nm, balancing accuracy and cost considerations. Measured [Formula: see text]-opic EDI results for 13 devices show a mean absolute error of less than 0.07 log lx, and a minimum between device correlation of 0.99. These findings demonstrate that accurate light sensing is feasible, including at wrist worn locations. We provide an experimental platform for use in future investigations in real-world light exposure monitoring and IoT-based lighting control.
    Language English
    Publishing date 2024-01-17
    Publishing country United States
    Document type Journal Article
    ISSN 2327-4662
    ISSN 2327-4662
    DOI 10.1109/JIOT.2024.3355330
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Ultra-thin anodized aluminium dielectric films: the effect of citric acid concentration and low-voltage electronic applications.

    Sagar, Srikrishna / Mohammadian, Navid / Park, Seonghyun / Majewski, Leszek A / Das, Bikas C

    Nanotechnology

    2020  Volume 31, Issue 25, Page(s) 255705

    Abstract: Anodically oxidized, ultra-thin (d < 10 nm) aluminium films emerge as the dielectric of choice for low-cost thin film capacitors (TFCs), thin film transistors (TFTs), and bio- and chemical sensors. In this work, the dielectric properties of ultra-thin ... ...

    Abstract Anodically oxidized, ultra-thin (d < 10 nm) aluminium films emerge as the dielectric of choice for low-cost thin film capacitors (TFCs), thin film transistors (TFTs), and bio- and chemical sensors. In this work, the dielectric properties of ultra-thin aluminium oxide films grown by anodization in aqueous solutions of citric acid (CA) have been studied. It is observed that the electrolyte strength variation from 0.1 mM to 1000 mM has virtually no influence on the chemical composition, surface morphology and the dielectric properties of the fabricated alumina films. The anodized films are very smooth having RMS area roughness around ∼5 Å. This was further improved after deposition of n-octadecyltrichlorosilane (OTS) self-assembled monolayer (SAM) to ∼4 Å. Also, the XRD and elemental analysis using EDS and XPS unambiguously confirms that the obtained oxide films are amorphous, stoichiometric Al
    Language English
    Publishing date 2020-03-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/ab7fd1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: One-Volt, Solution-Processed Organic Transistors with Self-Assembled Monolayer-Ta

    Mohammadian, Navid / Faraji, Sheida / Sagar, Srikrishna / Das, Bikas C / Turner, Michael L / Majewski, Leszek A

    Materials (Basel, Switzerland)

    2019  Volume 12, Issue 16

    Abstract: Low-voltage, solution-processed organic thin-film transistors (OTFTs) have tremendous potential to be key components in low-cost, flexible and large-area electronics. However, for these devices to operate at low voltage, robust and high capacitance gate ... ...

    Abstract Low-voltage, solution-processed organic thin-film transistors (OTFTs) have tremendous potential to be key components in low-cost, flexible and large-area electronics. However, for these devices to operate at low voltage, robust and high capacitance gate dielectrics are urgently needed. Herein, the fabrication of OTFTs that operate at 1 V is reported. These devices comprise a solution-processed, self-assembled monolayer (SAM) modified tantalum pentoxide (Ta
    Language English
    Publishing date 2019-08-12
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma12162563
    Database MEDical Literature Analysis and Retrieval System OnLINE

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