Janusz Smulko - Publications - MOST Wiedzy

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Year 2021
  • An Instantaneous Engine Speed Estimation Method Using Multiple Matching Synchrosqueezing Transform
    Publication
    • Y. Liu
    • H. Wen
    • Z. Ding
    • L. Xu
    • H. Chen
    • J. Smulko

    - Journal of Sensors - Year 2021

    Instantaneous rotational speed measurement of the engine is crucial in routine inspection and maintenance of an automobile engine. Since the contact measurement of rotational speed is not always available, the vibration measurement has been used for noncontact rotational speed estimation methods. Unfortunately, the accuracy of the noncontact estimation methods by analyzing engine vibration frequency is not satisfactory due to the...

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  • Design of Intelligent Low-Voltage Load Switch for Remote Control System in Smart Grid
    Publication
    • D. Xiong
    • X. Chen
    • R. Martinek
    • H. Wen
    • D. Luo
    • J. Smulko

    - Iranian Journal of Science and Technology-Transactions of Electrical Engineering - Year 2021

    Current low-voltage load switches do not support remote disconnect/connect and real-time monitoring of a disconnect/connect state. Addressing to these issues, this paper presents a low-voltage load switch for a smart remote control system, which uses a one-chip microcontroller board and a DC step motor drive mechanism and provides the feedback on the switch status also. Arrears disconnect and full-pay connect control is implemented...

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  • Embedded gas sensing setup for air samples analysis

    This paper describes a measurement setup (eNose) designed to analyze air samples containing various volatile organic compounds (VOCs). The setup utilizes a set of resistive gas sensors of divergent gas selectivity and sensitivity. Some of the applied sensors are commercially available and were proposed recently to reduce their consumed energy. The sensors detect various VOCs at sensitivities determined by metal oxide sensors’ technology...

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  • Generation-recombination and 1/f noise in carbon nanotube networks
    Publication
    • A. Rehman
    • A. Krajewska
    • B. Stonio
    • K. Pavlov
    • G. Cywinski
    • D. Lioubtchenko
    • W. Knap
    • S. Rumyantsev
    • J. Smulko

    - APPLIED PHYSICS LETTERS - Year 2021

    The low-frequency noise is of special interest for carbon nanotubes devices, which are building blocks for a variety of sensors, including radio frequency and terahertz detectors. We studied noise in as-fabricated and aged carbon nanotube networks (CNNs) field-effect transistors. Contrary to the majority of previous publications, as-fabricated devices demonstrated the superposition of generation-recombination (GR) and 1/f noise...

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  • Risk Analysis by a Probabilistic Model of the Measurement Process
    Publication

    - SENSORS - Year 2021

    The aim of the article is presentation of the testing methodology and results of examination the probabilistic model of the measurement process. The case study concerns the determination of the risk of an incorrect decision in the assessment of the compliance of products by measurement. Measurand is characterized by the generalized Rayleigh distribution. The model of the meas-urement process was tested in parallel mode by six risk...

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  • Room temperature depinning of the charge-density waves in quasi-two-dimensional 1T-TaS2 devices
    Publication
    • A. Mohammadzadeh
    • A. Rehman
    • F. Kargar
    • S. Rumyantsev
    • J. Smulko
    • W. Knap
    • R. K. Lake
    • A. A. Balandin

    - APPLIED PHYSICS LETTERS - Year 2021

    We report on the depinning of nearly commensurate charge-density waves in 1T-TaS2 thin films at room temperature. A combination of the differential current–voltage measurements with the low-frequency noise spectroscopy provides unambiguous means for detecting the depinning threshold field in quasi-2D materials. The depinning process in 1T-TaS2 is not accompanied by an observable abrupt increase in electric current—in striking contrast...

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  • Utilizing pulse dynamics for non-invasive Raman spectroscopy of blood analytes
    Publication

    - BIOSENSORS & BIOELECTRONICS - Year 2021

    Non-invasive measurement methods offer great benefits in the field of medical diagnostics with molecular-specific techniques such as Raman spectroscopy which is increasingly being used for quantitative measurements of tissue biochemistry in vivo. However, some important challenges still remain for label-free optical spectroscopy to be incorporated into the clinical laboratory for routine testing. In particular, non-analyte-specific...

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Year 2020
  • Advanced operating methods
    Publication

    - Year 2020

    Selected operating methods of resistive gas sensors were presented. The methods utilize flicker noise (1/f noise), which gives additional information about ambient gas when compared with the recorded changes of DC resistance only. Methods of flicker noise measurements were outlined. Recently developed prototype gas sensors comprising golden nanoparticle functionalized with organic ligands can generate intense flicker noise induced...

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  • Ammonia Gas Sensors: Comparison of Solid-State and Optical Methods
    Publication
    • Z. Bielecki
    • T. Stacewicz
    • J. Smulko
    • J. Wojtas

    - Applied Sciences-Basel - Year 2020

    High precision and fast measurement of gas concentrations is important for both understanding and monitoring various phenomena, from industrial and environmental to medical and scientific applications. This article deals with the recent progress in ammonia detection using in-situ solid-state and optical methods. Due to the continuous progress in material engineering and optoelectronic technologies, these methods are among the most...

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  • Analysis of Vibration and Acoustic Signals for Noncontact Measurement of Engine Rotation Speed
    Publication
    • S. Xuansheng
    • T. Lu
    • H. Wen
    • R. Martinek
    • J. Smulko

    - SENSORS - Year 2020

    The non-contact measurement of engine speed can be realized by analyzing engine vibration frequency. However, the vibration signal is distorted by harmonics and noise in the measurement. This paper presents a novel method for the measurement of engine rotation speed by using the cross-correlation of vibration and acoustic signals. This method can enhance the same frequency components in engine vibration and acoustic signal. After...

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  • Assessment of Electronic Sensing Techniques for the Rapid Identification of Alveolar Echinococcosis through Exhaled Breath Analysis
    Publication

    - SENSORS - Year 2020

    Here we present a proof-of-concept study showing the potential of a chemical gas sensors system to identify the patients with alveolar echinococcosis disease through exhaled breath analysis. The sensors system employed comprised an array of three commercial gas sensors and a custom gas sensor based on WO3 nanowires doped with gold nanoparticles, optimized for the measurement of common breath volatile organic compounds. The measurement...

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  • Comparability of Raman Spectroscopic Configurations: A Large Scale Cross-Laboratory Study
    Publication
    • S. Guo
    • C. Beleites
    • U. Neugebauer
    • S. Abalde-Cela
    • N. K. Afseth
    • F. Alsamad
    • S. Anand
    • C. Araujo-Andrade
    • S. Aškrabić
    • E. Avci... and 76 others

    - ANALYTICAL CHEMISTRY - Year 2020

    The variable configuration of Raman spectroscopic platforms is one of the major obstacles in establishing Raman spectroscopy as a valuable physicochemical method within real-world scenarios such as clinical diagnostics. For such real world applications like diagnostic classification, the models should ideally be usable to predict data from different setups. Whether it is done by training a rugged model with data from many setups...

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  • Fluctuation-Enhanced Sensing
    Publication

    - Journal of Sensors - Year 2020

    Fluctuation-enhanced sensing (FES) is an exciting and relatively new research field that promises to extend the range of information that can be extracted from a single sensor. In FES, the stochastic fluctuations of the sensor signal, rather than its average value, are recorded and analyzed. Typical components of such fluctuations are due to interactions at the microscopic level. Proper statistical analysis provides optimum sensory...

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  • Fluctuation-Enhanced Sensing (FES): A Promising Sensing Technique
    Publication

    - Applied Sciences-Basel - Year 2020

    Fluctuation-enhanced sensing (FES) is a very powerful odor and gas sensing technique and as such it can play a fundamental role in the control of environments and, therefore, in the protection of health. For this reason, we conduct a comprehensive survey on the state-of-the-art of the FES technique, highlighting potentials and limits. Particular attention is paid to the dedicated instrumentation necessary for the application of...

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  • Formaldehyde detection with chemical gas sensors based on WO3 nanowires decorated with metal nanoparticles under dark conditions and UV light irradiation
    Publication

    - SENSORS AND ACTUATORS B-CHEMICAL - Year 2020

    We report results of formaldehyde gas (CH2O) detection under dark conditions and UV light irradiation with pristine tungsten trioxide nanowires (WO3 NWs) and metal nanoparticles decorated WO3 NWs gas sensing layers. The resistive layers were deposited by one step aerosol assisted chemical vapor deposition (AACVD) on commercial alumina substrates with 10-pair interdigitated platinum electrodes. The elaborated gas sensors, based...

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  • Ocena jakości superkondensatorów wybranymi metodami, wykorzystując zjawiska losowe i badania rozkładu temperatury

    W artykule przedstawiono metody analizy jakości wykonania próbek superkondensatorów na podstawie pomiarów szumów generowanych w ich strukturach oraz rozkładów temperatury na ich powierzchni. Prezentowane metody zostały porównane z obecnie stosowanymi parametrami oceny jakości tych elementów. Wyniki uzasadniają wprowadzenie dodatkowych parametrów, pozwalających oceniać jakość superkondensatorów.

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  • Temperature distribution of supercapacitors prepared by various technologies

    Supercapacitors, also known by different names such as electrostatic double-layer capacitors (EDLCs) or ultra-capacitors, are electrical storage devices still in development. These devices require fast and reliable methods of assessing their state-of-health. Thermographic imaging is a method which can be applied with this aim due to its popularity, and the high negative impact of overheating on a supercapacitor’s parameters. Moreover,...

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  • UV Light-Modulated Fluctuation-Enhanced Gas Sensing by Layers of Graphene Flakes/TiO2 Nanoparticles
    Publication

    - Journal of Sensors - Year 2020

    We present experimental results of fluctuation-enhanced gas sensing by low-cost resistive sensors made of a mixture of graphene flakes and TiO2 nanoparticles. Both components are photocatalytic and activated by UV light. Two UV LEDs of different wavelengths (362 and 394 nm) were applied to modulate the gas sensing of the layers. Resistance noise was recorded at low frequencies, between 8 Hz and 10 kHz. The sensors’ response was...

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Year 2019
Year 2018
Year 2017
  • Assessment of Supercapacitor’s Quality by Means of Low Frequency Noise
    Publication

    Low frequency noise is a well-known tool for quality and reliability assessment of electronic devices. This phenomenon is observed in different electrochemical devices as well (e.g., smart windows, electrochemical corrosion processes). Thus, we can assume that the same tool can be used to asses quality of supercapacitors. Their quality is usually determined only by capacitance and/or equivalent series resistance (ESR), or impedance....

  • Corrosion process monitoring by AFM higher harmonic imaging

    The atomic force microscope (AFM) was invented in 1986 as an alternative to the scanning tunnelling microscope, which cannot be used in studies of non-conductive materials. Today the AFM is a powerful, versatile and fundamental tool for visualizing and studying the morphology of material surfaces. Moreover, additional information for some materials can be recovered by analysing the AFM's higher cantilever modes when the cantilever...

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  • Feasibility study of a Raman spectroscopic route to drug detection
    Publication

    - Year 2017

    We present an surface-enhanced Raman spectroscopy (SERS) approach for detection of drugs of abuse in whole human blood. We utilize a near infrared laser with 830 nm excitation wavelength in order to reduce the influence of fluorescence on the spectra of blood. However, regular plasmon resonance peak of plasmonic nanoparticles, such as silver or gold fall in a much lower wavelength regime about 400 nm. Therefore, we have shifted...

  • Fluctuation-enhanced and conductometric gas sensing with nanocrystalline NiO thin films: A comparison
    Publication

    - SENSORS AND ACTUATORS B-CHEMICAL - Year 2017

    Nanocrystalline thin films of NiO were prepared by advanced reactive gas deposition, and their responses to formaldehyde, ethanol and methane gases were studied via fluctuation-enhanced and conductometric methods Thin films with thicknesses in the 200–1700-nm range were investigated in as-deposited form and after annealing at 400 and 500 °C. Morphological and structural analyses showed porous deposits with NiO nanocrystals having...

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  • Measurements of flicker noise in supercapacitor cells
    Publication

    - Year 2017

    Flicker noise (1/f-like noise) is often used to assess the quality of various materials and devices. This phenomenon has been observed in different electrochemical devices or reactions (e.g., smart windows, pitting corrosion events). In our exploratory studies we consider how to measure and utilize 1/f noise for the quality assessment of supercapacitors. This task requires special attention because of enormous capacitance of the...

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  • Noise sources in Raman spectroscopy of biological objects
    Publication

    - Year 2017

    We present an overview of noise sources deteriorating the quality of the recorded biological Raman spectra and the ability to determine the specimen composition. The acquired Raman spectra exhibit intense additive noise components or drifts because of low intensity of the scattered light. Therefore we have to apply expensive or bulky measurement setups to limit their inherent noise or to apply additional signal processing to reduce...

  • Non-Gaussian Resistance Fluctuations in Gold-Nanoparticle-Based Gas Sensors: An Appraisal of Different Evaluation Techniques
    Publication

    - SENSORS - Year 2017

    Volatile organic compounds, such as formaldehyde, can be used as biomarkers in human exhaled breath in order to non-invasively detect various diseases, and the same compounds are of much interest also in the context of environmental monitoring and protection. Here, we report on a recently-developed gas sensor, based on surface-functionalized gold nanoparticles, which is able to generate voltage noise with a distinctly non-Gaussian...

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Year 2016
Year 2015

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