TY - CHAP A1 - Hirsch, Sören A1 - Brämer, Stefan T1 - Alumni of Vocational Education as a New Target Group for University Continuing Education T2 - Universities and Engagement: International perspectives on higher education and lifelong learning Y1 - 2015 U6 - https://doi.org/10.4324/9781315740669 SP - 39 EP - 53 PB - Routledge CY - London ET - 1 ER - TY - JOUR A1 - Hirsch, Sören A1 - Majcherek, S. A1 - Aman, A. A1 - Schmidt, B. T1 - Microwave emission from lead zirconate titanate induced by impulsive mechanical load JF - Journal of Applied Physics Y1 - 2015 U6 - https://doi.org/10.1063/1.4934735 VL - 118 IS - 16 SP - 164105-1 EP - 164105-7 ER - TY - JOUR A1 - Hirsch, Sören A1 - Pisarevskiy, A. A1 - Tatmyshevskiy, K. A1 - Tomas, J. A1 - Aman, S. T1 - Light emission during impact stressing of a particle layer JF - Measurement Science and Technology Y1 - 2015 U6 - https://doi.org/10.1088/0957-0233/26/4/045103 VL - 26 IS - 4 ER - TY - JOUR A1 - Agafonova, D. S. A1 - Kozyrev, A. B. A1 - Mukhin, N. V. A1 - Red'ka, D. N. A1 - Elanskaya, G. K. A1 - Rudenko, M. V. A1 - Oseev, A. A1 - Hirsch, Sören T1 - Impurity Phases in Polycrystalline Films of Ferroelectric Oxides of the Perovskite-Type on the Basis of Bi2SrTa2O9 and Pb(Zr,Ti)O3 JF - Glass Physics and Chemistry KW - complex oxides KW - perovskites KW - heterophase films KW - nonstoichiometry Y1 - 2018 U6 - https://doi.org/10.1134/S1087659618010029 VL - 44 IS - 1 SP - 15 EP - 20 ER - TY - JOUR A1 - Oseev, Aleksandr A1 - Mukhin, Nikolay A1 - Lucklum, Ralf A1 - Zubtsov, Mikhail A1 - Schmidt, Marc-Peter A1 - Steinmann, Ulrike A1 - Fomin, Aleksandr A1 - Kozyrev, Andrey A1 - Hirsch, Sören T1 - Study of liquid resonances in solid-liquid composite periodic structures (phononic crystals) – theoretical investigations and practical application for in-line analysis of conventional petroleum products JF - Sensors and Actuators B: Chemical KW - Phononic crystal sensor KW - Periodic composite structure KW - Ultrasonic sensor KW - Gasoline sensor KW - Petroleum sensor KW - In-line fuel sensor Y1 - 2018 U6 - https://doi.org/10.1016/j.snb.2017.10.144 VL - 257 SP - 469 EP - 477 ER - TY - JOUR A1 - Kurachkina, Margarita A1 - Konshina, Elena A1 - Oseev, Aleksandr A1 - Hirsch, Sören T1 - Hybrid structures based on gold nanoparticles and semiconductor quantum dots for biosensor applications JF - Nanotechnology Science and Applications Y1 - 2018 U6 - https://doi.org/10.2147/nsa.s155045 VL - 11 SP - 15 EP - 21 ER - TY - JOUR A1 - Mukhin, N.V. A1 - Redka, D. N. A1 - Tarasov, S. A. A1 - Oseev, A. Yu. A1 - Hirsch, Sören T1 - Two-Dimensional Periodic Composite Structure for Acoustic Sensor of Volumetric Properties of Liquids T1 - Dvumernaja periodičeskaja kompozitnaja struktura dlja akustičeskogo datčika ob"emnych svojstv židkosti JF - Journal of the Russian Universities. Radioelectronics JF - Izvestija vysšich učebnych zavedenij Rossii : radioėlektronika Y1 - 2018 U6 - https://doi.org/10.32603/1993-8985-2018-21-1-56-63 IS - 1 SP - 56 EP - 63 ER - TY - CHAP A1 - Redka, D. A1 - Mukhin, N. A1 - Grishkanich, A. A1 - Terukov, E. A1 - Hirsch, Sören T1 - Surface modification of ZnO for solar converters by NdYaG Laser T2 - International Conference Laser Optics (ICLO), St. Petersburg, 2018 Y1 - 2018 U6 - https://doi.org/10.1109/LO.2018.8435248 SP - 340 EP - 340 PB - IEEE ER - TY - JOUR A1 - Oseev, Aleksandr A1 - Mukhin, Nikolay V. A1 - Lucklum, Ralf A1 - Zubtsov, Mikhail A1 - Schmidt, Marc-Peter A1 - Redka, Dmitrii A1 - Kozyrev, Andrey A1 - Hirsch, Sören T1 - Towards macroporous phononic crystal based structures for FBAR applications. Theoretical investigation of technologically competitive solutions JF - Microsystem Technologies Y1 - 2018 U6 - https://doi.org/10.1007/s00542-017-3616-1 VL - 24 IS - 5 SP - 2389 EP - 2399 ER - TY - CHAP A1 - Platonov, R. A. A1 - Altynnikov, A. G. A1 - Mikhailov, A. K. A1 - Yastrebov, A. V. A1 - Mukhin, N. V. A1 - Hirsch, Sören A1 - Kozyrev, A. B. T1 - Tunable impedance microwave matching of laser diodes T2 - Konferenz: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)/ Titel: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS) Y1 - 2017 UR - http://ieeexplore.ieee.org/document/8261920/ SN - 978-1-5090-6269-0 U6 - https://doi.org/10.1109/PIERS.2017.8261920 SP - 1152 EP - 1157 PB - IEEE CY - St Petersburg, Russia ER - TY - JOUR A1 - Lucklum, Ralf A1 - Zubtsov, Mikhail A1 - Oseev, Aleksandr A1 - Schmidt, Marc-Peter A1 - Hirsch, Sören T1 - SAW Based Sandwich Phononic Crystal Sensor JF - Procedia Engineering N2 - Sensing is nowadays an accepted application of phononic crystals with chemical and biosensors for liquid analytes being the perhaps most promising ones. A liquid-filled defect is introduced that turns into a resonant cavity. Similar to the well-known resonant sensors sensitivity can be increased with higher operating frequencies. We introduce a Sandwiched Phononic Crystal (SPC), which applies a resonant cavity located between two stacked layers on top of a SAW device. Key challenges are coupling of surface acoustic wave into the liquid cavities and avoiding scattering of the guided waves into the bulk of the sensor chip. Y1 - 2016 UR - https://linkinghub.elsevier.com/retrieve/pii/S1877705816335640 U6 - https://doi.org/10.1016/j.proeng.2016.11.251 SN - 18777058 IS - 168 SP - 700 EP - 703 PB - Elsevier ER - TY - JOUR A1 - Schmidt, Marc-Peter A1 - Oseev, Aleksandr A1 - Lucklum, Ralf A1 - Zubtsov, Mikhail A1 - Hirsch, Sören T1 - SAW based phononic crystal sensor, technological challenges and solutions JF - Microsystem Technologies Y1 - 2016 UR - http://link.springer.com/10.1007/s00542-015-2781-3 U6 - https://doi.org/10.1007/s00542-015-2781-3 SN - 0946-7076, 1432-1858 SP - 1593 EP - 1599 PB - Springer Link ER - TY - CHAP A1 - Schmidt, Marc-Peter A1 - Oseev, Aleksandr A1 - Lucklum, Ralf A1 - Zubtsov, Mikhail A1 - Hirsch, Sören T1 - SAW based phononic crystal liquid sensor - Periodic microfluidic channels approach T2 - Konferenz: 2016 IEEE International Ultrasonics Symposium (IUS)/ Titel:2016 IEEE International Ultrasonics Symposium (IUS) N2 - Phononic crystals (PnC) with a specifically designed liquid-filled defect have been recently introduced as a novel sensor platform (Lucklum et al. in Sens Actuators B Chem 171–172:271–277, 2012). Sensors based on this principle feature a band gap covering the typical input span of the measurand as well as a narrow transmission peak within the band gap where the frequency of maximum transmission is governed by the measurand. This approach has been applied for determination of volumetric properties of liquids (Lucklum et al. in Sens Actuators B Chem 171–172:271–277, 2012; Oseev et al. in Sens Actuators B Chem 189:208–212, 2013; Lucklum and Li in Meas Sci Technol 20(12):124014, 2009) and has demonstrated attractive sensitivity. One way to improve sensitivity requires higher probing frequencies in the range of 100 MHz and above. In this range surface acoustic wave (SAW) devices are an established basis for sensors. We have performed first tests towards a PnC microsensors (Lucklum et al. in Towards a SAW based phononic crystal sensor platform. In: 2013 Joint European frequency and time forum and international frequency control symposium (EFTF/IFC), pp 69–72, 2013). The respective feature size of the PnC SAW sensor has dimensions in the range of 10 µm and below. Whereas those dimensions are state of the art for common MEMS materials, etching of holes and cavities in piezoelectric materials that have an aspect ratio diameter/depth is still challenging. In this contribution we describe an improved technological process able to realize considerably deep and uniform holes in a SAW substrate. Y1 - 2016 UR - http://ieeexplore.ieee.org/document/7728788/ SN - 978-1-4673-9897-8 U6 - https://doi.org/10.1109/ULTSYM.2016.7728788 SP - 1 EP - 4 PB - IEEE CY - Tours, France ER - TY - CHAP A1 - Fomina, Marina A. A1 - Koshuro, Vladimir A. A1 - Fomin, Aleksandr A. A1 - Rodionov, Igor V. A1 - Skaptsov, Aleksandr A. A1 - Zakharevich, Andrey M. A1 - Aman, Alexander A1 - Oseev, Aleksandr A1 - Hirsch, Sören A1 - Majcherek, Soeren ED - Tuchin, Valery V. ED - Derbov, Vladimir L. ED - Postnov, Dmitry E. ED - Meglinski, Igor V. ED - Larin, Kirill V. ED - Pravdin, Alexander B. ED - Genina, Elina A. T1 - Peculiarities of structure formation of layered metal-oxide system Ti-Ta-(Ti,Ta) x O y during electro-spark alloying and thermally stimulated modification T2 - Konferenz: Saratov, Russian Federation/ Titel: PROCEEDINGS VOLUME 9917 SARATOV FALL MEETING 2015 | 22-25 SEPTEMBER 2015 Saratov Fall Meeting 2015: Third International Symposium on Optics and Biophotonics and Seventh Finnish-Russian Photonics and Laser Symposium (PALS) N2 - The study focuses on high-performance combined electro-spark alloying of titanium and titanium alloy (VT1-0, VT16) surface and porous matrix structure oxidation. The metal-oxide coatings morphology is the result of melt drop transfer, heat treatment, and oxidation. The study establishes the influence of technological regimes of alloying and oxidation on morphological heterogeneity of biocompatible layered metal-oxide system Ti-Ta-(Ti,Ta)xOy. It was found that during electro-spark alloying the concentration of tantalum on the titanium surface ranges from 0.1 to 3.2 at.%. Morphology of the deposited splats is represented by uniformly grown crystals of titanium and tantalum oxides, which increase from nano- to submicron size. Y1 - 2016 UR - http://proceedings.spiedigitallibrary.org/proceeding.aspx?doi=10.1117/12.2229491 U6 - https://doi.org/10.1117/12.2229491 PB - SPIE. Digital Library CY - Saratov, Russian Federation ER - TY - CHAP A1 - Schmidt, Marc-Peter A1 - Oseev, Aleksandr A1 - Engel, C. A1 - Brose, Andreas A1 - Aman, Alexander A1 - Hirsch, Sören T1 - A Novel Design and Fabrication of Multichannel Microfluidic Impedance Spectroscopy Sensor for Intensive Electromagnetic Environment Application T2 - Konferenz: The 28th European Conference on Solid-State Transducers (EUROSENSORS)/ Titel: Procedia Engineering 2014 Y1 - 2014 UR - https://linkinghub.elsevier.com/retrieve/pii/S187770581402387X U6 - https://doi.org/10.1016/j.proeng.2014.11.272 IS - 87 SP - 88 EP - 91 PB - Elsevier CY - Brescia, Italy ER - TY - CHAP A1 - Schmidt, Marc-Peter A1 - Oseev, Alexander A1 - Engel, C. A1 - Brose, Andreas A1 - Hirsch, Sören T1 - IMPEDANCE SPECTROSCOPY MICROFLUIDIC MULTICHANNEL SENSOR PLATFORM FOR LIQUID ANALYSIS T2 - Konferenz: International Conference on Miniaturized Systems for Chemistry and Life Sciences/ Titel: 18th International Conference on Miniaturized Systems for Chemistry and Life Sciences : (MicroTAS 2014); San Antonio, Texas, USA, 26 - 30 October 2014 / [CBMS] ; Vol. 4 Y1 - 2014 UR - http://rgdoi.net/10.13140/2.1.4254.8004 SN - 978-1-63439-697-4 U6 - https://doi.org/10.13140/2.1.4254.8004 IS - 4 SP - 1957 EP - 2577 PB - Curran CY - Red Hook, NY ER - TY - JOUR A1 - Aman, A. A1 - Majcherek, Soeren A1 - Schmidt, M. P. A1 - Orseev, A. A1 - Engel, C. A1 - Hirsch, Sören T1 - Behavior of Current Flow on Lead Zirconate Titanate Surfaces during Mechanical Impact JF - Research & Reviews: Journal of Material Sciences Y1 - 2016 UR - http://www.rroij.com/open-access/behavior-of-current-flow-on-lead-zirconate-titanate-surfacesduring-mechanical-impact-.php?aid=69107 U6 - https://doi.org/10.4172/2321-6212.1000137 SN - 23216212 IS - Ausgabe: 1/ Band: 4 PB - Research and Reviews ER - TY - CHAP A1 - Schmidt, Marc-Peter A1 - Oseev, Aleksandr A1 - Lucklum, Ralf A1 - Hirsch, Sören ED - Sánchez-Rojas, José Luis ED - Brama, Riccardo T1 - Technology towards a SAW based phononic crystal sensor T2 - Konferenz: SPIE Microtechnologies, Barcelona, Spain, 2015/ Titel: PROCEEDINGS VOLUME 9517 SPIE MICROTECHNOLOGIES | 4-6 MAY 2015 Smart Sensors, Actuators, and MEMS VII; and Cyber Physical Systems Y1 - 2015 UR - http://proceedings.spiedigitallibrary.org/proceeding.aspx?doi=10.1117/12.2178810 U6 - https://doi.org/10.1117/12.2178810 ER - TY - CHAP A1 - Oseev, Aleksandr A1 - Schmidt, Marc-Peter A1 - Lucklum, Ralf A1 - Zubtsov, Mikhail A1 - Hirsch, Sören T1 - Phononic crystal based liquid sensor governed by localized defect resonances T2 - Konferenz: IEEE Symposium (IUS) Ultrasonics, 2015/ Titel: 2015 IEEE International Ultrasonics Symposium (IUS) Y1 - 2015 UR - http://ieeexplore.ieee.org/document/7329492/ SN - 978-1-4799-8182-3 U6 - https://doi.org/10.1109/ULTSYM.2015.0053 SP - 1 EP - 4 PB - IEEE CY - Taipei, Taiwan ER - TY - CHAP A1 - Schmidt, Marc-Peter A1 - Oseev, Aleksandr A1 - Engel, Christian A1 - Brose, Andreas A1 - Hirsch, Sören T1 - A7.1 - Flexible free-standing SU-8 microfluidic impendance spectroscopy sensor for 3D molded interconnect devices application T2 - Konferenz: AMA Conferences 2015/ Titel: Proceedings SENSOR 2015 Y1 - 2015 UR - http://www.ama-science.org/doi/10.5162/sensor2015/A7.1 SN - 978-3-9813484-8-4 U6 - https://doi.org/10.5162/sensor2015/A7.1 SP - 151 EP - 155 PB - AMA Service GmbH CY - Nürnberg, Germany ER - TY - JOUR A1 - Aman, Alexander A1 - Majcherek, Soeren A1 - Hirsch, Sören T1 - Microwave Emission of Carbon Fibres During Electrical Breakdown JF - Sensor Letters Y1 - 2015 UR - http://openurl.ingenta.com/content/xref?genre=article&issn=1546-198X&volume=13&issue=1&spage=98 U6 - https://doi.org/10.1166/sl.2015.3408 SN - 1546198X, 15461971 IS - Ausgabe: 1/ Heft: 13 SP - 98 EP - 101 PB - American Scientific Publishers ER - TY - CHAP A1 - Brämer, Stefan A1 - Vieback, Linda A1 - Schiller, Gregor A1 - Hirsch, Sören T1 - Situiertes Lernen in der dualen Berufsausbildung. Entwicklung eines Lehr-Lern-Arrangements für den Ausbildungsinhalt „Sicherheit und Gesundheitsschutz bei der Arbeit“ T2 - Konferenz: 61. GfA-Frühjahrskongress, 2015/ Titel: Verantwortung für die Arbeit der Zukunft 61. GfA-Frühjahrskongress, 25. - 27.02.2015, Karlsruhe Y1 - 2015 SN - 978-3-936804-18-8 PB - GfA-Press CY - Dortmund ER - TY - JOUR A1 - Majcherek, Soeren A1 - Aman, A. A1 - Hirsch, Sören A1 - Schmidt, B. T1 - Silicon based in-situ measurement system for flex loads on MLCCs in PCB manufacturing chain JF - Sensors and Actuators A: Physical Y1 - 2015 UR - https://linkinghub.elsevier.com/retrieve/pii/S092442471530025X U6 - https://doi.org/10.1016/j.sna.2015.06.005 SN - 09244247 IS - 233 SP - 267 EP - 274 PB - Elsevier ER - TY - JOUR A1 - Kuznetsov, Arthur A1 - Frorip, Aleksandr A1 - Sünter, Alar A1 - Kasvand, Nensi A1 - Korsakov, Vadim A1 - Konoplev, Georgii A1 - Stepanova, Oksana A1 - Rusalepp, Linda A1 - Anton, Dea A1 - Püssa, Tõnu A1 - Roasto, Mati A1 - Abramova, Liubov A1 - Kozin, Andrey A1 - Toom, Lauri A1 - Hirsch, Sören A1 - Mukhin, Nikolay ED - mdpi, T1 - Fast Protein and Metabolites (Nucleotides and Nucleosides) Liquid Chromatography Technique and Chemical Sensor for the Assessment of Fish and Meat Freshness JF - Chemosensors N2 - Fast protein and metabolite liquid chromatography (FPLMC) was introduced years ago to enable the easy separation of high-molecular compounds such as proteins from small molecules and the identification of the low-molecular substances. In this paper, the method is applied for the rapid evaluation of freshness and monitoring the aging of animal meat and fish. A novel chromatographic sensor was developed with a deep UV LED-based photometric detection unit (255–265 nm), an original flow cuvette and registration scheme; the processing of a chromatogram with the sensor takes approximately 15 min. Strict isochronism between the elution of ATP metabolites, mainly hypoxanthine (Hx) and inosine monophosphate (IMP), and the time of maturation of meat or fish, was discovered. A new freshness index H* = [Hx]/[IMP] was introduced, which is proportional to the instrumental delay time in the FPMLC chromatograms: the H* index < 0.5 indicates the presence of inosine monophosphate (IMP) and the high quality of the meat or fish. Reasonably strong correlations were revealed between data obtained by FPMLC and total volatile basic nitrogen TVB-N (for fish) or volatile fatty acids VFA (for meat) content. Moreover, putative nucleotide salvage and an increase in the concentration of IMP were observed in fish after heat treatment using the FPMLC sensor and NMR technique. Y1 - 2023 UR - https://www.mdpi.com/2227-9040/11/1/69 U6 - https://doi.org/10.3390/chemosensors11010069 SN - 2227-9040 IS - 1/2023 / Band 11 PB - MDPI ER - TY - JOUR A1 - Kuznetsov, Artur A1 - Frorip, Aleksandr A1 - Sünter, Alar A1 - Korsakov, Vadim A1 - Konoplev, Georgii A1 - Stepanova, Oksana A1 - Roschina, Natalia A1 - Ovsyannikov, Nikolay A1 - Lialin, Daniil A1 - Gerasimchuk, Roman A1 - Dmitriev, Alexander A1 - Mukhin, Nikolay A1 - Hirsch, Sören T1 - Optical Chemical Sensor Based on Fast-Protein Liquid Chromatography for Regular Peritoneal Protein Loss Assessment in End-Stage Renal Disease Patients on Continuous Ambulatory Peritoneal Dialysis JF - Chemosensors KW - optical chemical sensor KW - fast-protein liquid chromatography KW - UV LED KW - end-stage renal disease KW - peritoneal dialysis KW - peritoneal protein loss KW - albumin KW - point-of-care diagnostic devices Y1 - 2022 U6 - https://doi.org/10.3390/chemosensors10060232 VL - 10 IS - 6 PB - MDPI ER - TY - JOUR A1 - Konoplev, Georgii A1 - Agafonova, Darina A1 - Bakhchova, Liubov A1 - Mukhin, Nikolay A1 - Kurachkina, Marharyta A1 - Schmidt, Marc-Peter A1 - Verlov, Nikolay A1 - Sidorov, Alexander A1 - Oseev, Aleksandr A1 - Stepanova, Oksana A1 - Kozyrev, Andrey A1 - Dmitriev, Alexander A1 - Hirsch, Sören T1 - Label-Free Physical Techniques and Methodologies for Proteins Detection in Microfluidic Biosensor Structures JF - Biomedicines KW - label-free biosensor KW - microfluidics KW - proteins detection KW - optical biosensors KW - impedance spectroscopy KW - plasmon resonance KW - point-of-care KW - diagnostic devices Y1 - 2022 U6 - https://doi.org/10.3390/biomedicines10020207 SN - 2227-9059 VL - 10 IS - 2 SP - 207 PB - MDPI ER - TY - CHAP A1 - Kersten, Philipp A1 - Buzin, Johannes A1 - Hirsch, Sören T1 - Wireless Sensor Nodes for Condition Based Maintenance in Railway Systems T2 - IEEE Sensors Conference, Kobe, Japan, 2024 N2 - Ensuring the reliability, safety, and efficiency of railway systems is increasingly critical in global transportation networks. This paper addresses the necessity for advanced monitoring systems by introducing a multivariate energy-efficient wireless sensor node designed for proactive maintenance in rail applications. Y1 - 2024 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10784508 U6 - https://doi.org/10.1109/SENSORS60989.2024.10784508 SP - 1 EP - 4 PB - IEEE ER - TY - JOUR A1 - Daupayev, Nursultan A1 - Engel, Christian A1 - Hirsch, Sören T1 - Two-to-One Trigger Mechanism for Event-Based Environmental Sensing JF - Sensors N2 - Environmental monitoring systems often operate continuously, measuring various parameters, including carbon dioxide levels (CO2), relative humidity (RH), temperature (T), and other factors that affect environmental conditions. Such systems are often referred to as smart systems because they can autonomously monitor and respond to environmental conditions and can be integrated both indoors and outdoors to detect, for example, structural anomalies. However, these systems typically have high energy consumption, data overload, and large equipment sizes, which makes them difficult to install in constrained spaces. Therefore, three challenges remain unresolved: efficient energy use, accurate data measurement, and compact installation. To address these limitations, this study proposes a two-to-one threshold sampling approach, where the CO2 measurement is activated when the specified T and RH change thresholds are exceeded. This event-driven method avoids redundant data collection, minimizes power consumption, and is suitable for resource-constrained embedded systems. The proposed approach was implemented on a low-power, small-form and self-made multivariate sensor based on the PIC16LF19156 microcontroller. In contrast, a commercial monitoring system and sensor modules based on the Arduino Uno were used for comparison. As a result, by activating only key points in the T and RH signals, the number of CO2 measurements was significantly reduced without loss of essential signal characteristics. Signal reconstruction from the reduced points demonstrated high accuracy, with a mean absolute error (MAE) of 0.0089 and root mean squared error (RMSE) of 0.0117. Despite reducing the number of CO2 measurements by approximately 41.9%, the essential characteristics of the signal were saved, highlighting the efficiency of the proposed approach. Despite its effectiveness in controlled conditions (in buildings, indoors), environmental factors such as the presence of people, ventilation systems, and room layout can significantly alter the dynamics of CO2 concentrations, which may limit the implementation of this approach. Future studies will focus on the study of adaptive threshold mechanisms and context-dependent models that can adjust to changing conditions. This approach will expand the scope of application of the proposed two-to-one sampling technique in various practical situations. Y1 - 2025 UR - https://www.mdpi.com/1424-8220/25/13/4107 U6 - https://doi.org/10.3390/s25134107 VL - 25 IS - 13 SP - 1 EP - 18 PB - MDPI ER - TY - CHAP A1 - Daupayev, Nursultan A1 - Reber, Paul A1 - Bendyk, Ricky A1 - Engel, Christian A1 - Hirsch, Sören T1 - Data Reduction for Energy-Constrained Sensors via Event-Aware Sampling T2 - Konferenz: 2025 IEEE SENSORS, Vancouver, BC, Canada, 2025 N2 - Environmental monitoring plays a crucial role in analyzing environmental parameters and detecting anomalies. However, sensor systems work continuously, which results in constant energy consumption and data redundancy, especially for sensors with limited computing power and memory. In addition, installing and maintaining sensors in remote places creates additional challenges. An adaptive environmental sensing approach is developed to reduce data redundancy and energy consumption. A custom-designed sensor based on PIC16LF19156 microcontroller measures CO2, humidity and temperature simultaneously. The sensor is connected to a Raspberry Pi, where a signal processing algorithm is executed, aimed at reducing data redundancy, thereby increasing the energy efficiency of the system. The algorithm includes the discrete wavelet transform (DWT) to extract spectral features from the signals. A machine learning model trained on previous data estimates the daily variability of the signal and saves data labeled as SAVE (deviations) or SKIP (consistency). As a result, only the relevant intervals showing significant fluctuations are retained. The effectiveness of the proposed approach was evaluated by reconstructing the compressed signals and comparing them with the original data based on RMSE and MAE metrics, which confirms the insignificant loss of information. Y1 - 2025 SN - 979-8-3315-4467-6 U6 - https://doi.org/10.1109/SENSORS59705.2025.11330656 SN - 2168-9229 SP - 1 EP - 4 PB - IEEE ER - TY - JOUR A1 - Mukhin, Nikolay A1 - Sokolova, Irina A1 - Chigirev, Dmitry A1 - Rudaja, Lyudmila A1 - Lebedeva, Galina A1 - Kastro, Rene A1 - Bol’shakov, Maxim A1 - Schmidt, Marc-Peter A1 - Hirsch, Sören T1 - Composite Ferroelectric Coatings Based on a Heat-Resistant Polybenzoxazole Polymer Matrix JF - Coatings KW - lead zirconate titanate KW - poly(o-hydroxy amide) KW - 4,4-(hexafluoroisopropylidene) dianiline KW - 5,5-methylene bis(2-aminophenol) KW - poly(o-hydroxyamide) KW - composite ferroelectric coatings KW - thermal stability of dielectric properties Y1 - 2020 U6 - https://doi.org/10.3390/coatings10030286 VL - 10 IS - 3 SP - 286 PB - MDPI ER - TY - JOUR A1 - Redka, D. A1 - Mukhin, N. A1 - Grishkanich, A. A1 - Terukov, E. A1 - Hirsch, Sören A1 - Ignateva, L. T1 - NdYAG surface modification of ZnO for solar cells JF - Journal of Physics: Conference Series Y1 - 2019 U6 - https://doi.org/10.1088/1742-6596/1410/1/012106 VL - 1410 SP - 012106 PB - IOP Science ER -