@incollection{HirschBraemer2015, author = {Hirsch, S{\"o}ren and Br{\"a}mer, Stefan}, title = {Alumni of Vocational Education as a New Target Group for University Continuing Education}, series = {Universities and Engagement: International perspectives on higher education and lifelong learning}, booktitle = {Universities and Engagement: International perspectives on higher education and lifelong learning}, edition = {1}, publisher = {Routledge}, address = {London}, doi = {10.4324/9781315740669}, publisher = {Technische Hochschule Brandenburg}, pages = {39 -- 53}, year = {2015}, language = {en} } @article{HirschMajcherekAmanetal.2015, author = {Hirsch, S{\"o}ren and Majcherek, S. and Aman, A. and Schmidt, B.}, title = {Microwave emission from lead zirconate titanate induced by impulsive mechanical load}, series = {Journal of Applied Physics}, volume = {118}, journal = {Journal of Applied Physics}, number = {16}, doi = {10.1063/1.4934735}, pages = {164105-1 -- 164105-7}, year = {2015}, language = {en} } @article{HirschPisarevskiyTatmyshevskiyetal.2015, author = {Hirsch, S{\"o}ren and Pisarevskiy, A. and Tatmyshevskiy, K. and Tomas, J. and Aman, S.}, title = {Light emission during impact stressing of a particle layer}, series = {Measurement Science and Technology}, volume = {26}, journal = {Measurement Science and Technology}, number = {4}, doi = {10.1088/0957-0233/26/4/045103}, year = {2015}, language = {en} } @article{AgafonovaKozyrevMukhinetal.2018, author = {Agafonova, D. S. and Kozyrev, A. B. and Mukhin, N. V. and Red'ka, D. N. and Elanskaya, G. K. and Rudenko, M. V. and Oseev, A. and Hirsch, S{\"o}ren}, title = {Impurity Phases in Polycrystalline Films of Ferroelectric Oxides of the Perovskite-Type on the Basis of Bi2SrTa2O9 and Pb(Zr,Ti)O3}, series = {Glass Physics and Chemistry}, volume = {44}, journal = {Glass Physics and Chemistry}, number = {1}, doi = {10.1134/S1087659618010029}, pages = {15 -- 20}, year = {2018}, language = {en} } @article{OseevMukhinLucklumetal.2018, author = {Oseev, Aleksandr and Mukhin, Nikolay and Lucklum, Ralf and Zubtsov, Mikhail and Schmidt, Marc-Peter and Steinmann, Ulrike and Fomin, Aleksandr and Kozyrev, Andrey and Hirsch, S{\"o}ren}, title = {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}, series = {Sensors and Actuators B: Chemical}, volume = {257}, journal = {Sensors and Actuators B: Chemical}, doi = {10.1016/j.snb.2017.10.144}, pages = {469 -- 477}, year = {2018}, language = {en} } @article{KurachkinaKonshinaOseevetal.2018, author = {Kurachkina, Margarita and Konshina, Elena and Oseev, Aleksandr and Hirsch, S{\"o}ren}, title = {Hybrid structures based on gold nanoparticles and semiconductor quantum dots for biosensor applications}, series = {Nanotechnology Science and Applications}, volume = {11}, journal = {Nanotechnology Science and Applications}, doi = {10.2147/nsa.s155045}, pages = {15 -- 21}, year = {2018}, language = {en} } @article{MukhinRedkaTarasovetal.2018, author = {Mukhin, N.V. and Redka, D. N. and Tarasov, S. A. and Oseev, A. Yu. and Hirsch, S{\"o}ren}, title = {Two-Dimensional Periodic Composite Structure for Acoustic Sensor of Volumetric Properties of Liquids}, series = {Journal of the Russian Universities. Radioelectronics}, journal = {Journal of the Russian Universities. Radioelectronics}, number = {1}, doi = {10.32603/1993-8985-2018-21-1-56-63}, pages = {56 -- 63}, year = {2018}, language = {ru} } @inproceedings{RedkaMukhinGrishkanichetal.2018, author = {Redka, D. and Mukhin, N. and Grishkanich, A. and Terukov, E. and Hirsch, S{\"o}ren}, title = {Surface modification of ZnO for solar converters by NdYaG Laser}, series = {International Conference Laser Optics (ICLO), St. Petersburg, 2018}, booktitle = {International Conference Laser Optics (ICLO), St. Petersburg, 2018}, publisher = {IEEE}, doi = {10.1109/LO.2018.8435248}, pages = {340 -- 340}, year = {2018}, language = {en} } @article{OseevMukhinLucklumetal.2018, author = {Oseev, Aleksandr and Mukhin, Nikolay V. and Lucklum, Ralf and Zubtsov, Mikhail and Schmidt, Marc-Peter and Redka, Dmitrii and Kozyrev, Andrey and Hirsch, S{\"o}ren}, title = {Towards macroporous phononic crystal based structures for FBAR applications. Theoretical investigation of technologically competitive solutions}, series = {Microsystem Technologies}, volume = {24}, journal = {Microsystem Technologies}, number = {5}, doi = {10.1007/s00542-017-3616-1}, pages = {2389 -- 2399}, year = {2018}, language = {en} } @inproceedings{PlatonovAltynnikovMikhailovetal.2017, author = {Platonov, R. A. and Altynnikov, A. G. and Mikhailov, A. K. and Yastrebov, A. V. and Mukhin, N. V. and Hirsch, S{\"o}ren and Kozyrev, A. B.}, title = {Tunable impedance microwave matching of laser diodes}, series = {Konferenz: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)/ Titel: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)}, booktitle = {Konferenz: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)/ Titel: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)}, publisher = {IEEE}, address = {St Petersburg, Russia}, isbn = {978-1-5090-6269-0}, doi = {10.1109/PIERS.2017.8261920}, pages = {1152 -- 1157}, year = {2017}, language = {en} } @article{LucklumZubtsovOseevetal.2016, author = {Lucklum, Ralf and Zubtsov, Mikhail and Oseev, Aleksandr and Schmidt, Marc-Peter and Hirsch, S{\"o}ren}, title = {SAW Based Sandwich Phononic Crystal Sensor}, series = {Procedia Engineering}, journal = {Procedia Engineering}, number = {168}, publisher = {Elsevier}, issn = {18777058}, doi = {10.1016/j.proeng.2016.11.251}, pages = {700 -- 703}, year = {2016}, abstract = {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.}, language = {en} } @article{SchmidtOseevLucklumetal.2016, author = {Schmidt, Marc-Peter and Oseev, Aleksandr and Lucklum, Ralf and Zubtsov, Mikhail and Hirsch, S{\"o}ren}, title = {SAW based phononic crystal sensor, technological challenges and solutions}, series = {Microsystem Technologies}, journal = {Microsystem Technologies}, publisher = {Springer Link}, issn = {0946-7076, 1432-1858}, doi = {10.1007/s00542-015-2781-3}, pages = {1593 -- 1599}, year = {2016}, language = {en} } @inproceedings{SchmidtOseevLucklumetal.2016, author = {Schmidt, Marc-Peter and Oseev, Aleksandr and Lucklum, Ralf and Zubtsov, Mikhail and Hirsch, S{\"o}ren}, title = {SAW based phononic crystal liquid sensor - Periodic microfluidic channels approach}, series = {Konferenz: 2016 IEEE International Ultrasonics Symposium (IUS)/ Titel:2016 IEEE International Ultrasonics Symposium (IUS)}, booktitle = {Konferenz: 2016 IEEE International Ultrasonics Symposium (IUS)/ Titel:2016 IEEE International Ultrasonics Symposium (IUS)}, publisher = {IEEE}, address = {Tours, France}, isbn = {978-1-4673-9897-8}, doi = {10.1109/ULTSYM.2016.7728788}, pages = {1 -- 4}, year = {2016}, abstract = {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.}, language = {en} } @inproceedings{FominaKoshuroFominetal.2016, author = {Fomina, Marina A. and Koshuro, Vladimir A. and Fomin, Aleksandr A. and Rodionov, Igor V. and Skaptsov, Aleksandr A. and Zakharevich, Andrey M. and Aman, Alexander and Oseev, Aleksandr and Hirsch, S{\"o}ren and Majcherek, Soeren}, title = {Peculiarities of structure formation of layered metal-oxide system Ti-Ta-(Ti,Ta) x O y during electro-spark alloying and thermally stimulated modification}, series = {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)}, booktitle = {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)}, editor = {Tuchin, Valery V. and Derbov, Vladimir L. and Postnov, Dmitry E. and Meglinski, Igor V. and Larin, Kirill V. and Pravdin, Alexander B. and Genina, Elina A.}, publisher = {SPIE. Digital Library}, address = {Saratov, Russian Federation}, doi = {10.1117/12.2229491}, year = {2016}, abstract = {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.}, language = {en} } @inproceedings{SchmidtOseevEngeletal.2014, author = {Schmidt, Marc-Peter and Oseev, Aleksandr and Engel, C. and Brose, Andreas and Aman, Alexander and Hirsch, S{\"o}ren}, title = {A Novel Design and Fabrication of Multichannel Microfluidic Impedance Spectroscopy Sensor for Intensive Electromagnetic Environment Application}, series = {Konferenz: The 28th European Conference on Solid-State Transducers (EUROSENSORS)/ Titel: Procedia Engineering 2014}, booktitle = {Konferenz: The 28th European Conference on Solid-State Transducers (EUROSENSORS)/ Titel: Procedia Engineering 2014}, number = {87}, publisher = {Elsevier}, address = {Brescia, Italy}, doi = {10.1016/j.proeng.2014.11.272}, pages = {88 -- 91}, year = {2014}, language = {en} } @inproceedings{SchmidtOseevEngeletal.2014, author = {Schmidt, Marc-Peter and Oseev, Alexander and Engel, C. and Brose, Andreas and Hirsch, S{\"o}ren}, title = {IMPEDANCE SPECTROSCOPY MICROFLUIDIC MULTICHANNEL SENSOR PLATFORM FOR LIQUID ANALYSIS}, series = {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}, booktitle = {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}, number = {4}, publisher = {Curran}, address = {Red Hook, NY}, isbn = {978-1-63439-697-4}, doi = {10.13140/2.1.4254.8004}, pages = {1957 -- 2577}, year = {2014}, language = {en} } @article{AmanMajcherekSchmidtetal.2016, author = {Aman, A. and Majcherek, Soeren and Schmidt, M. P. and Orseev, A. and Engel, C. and Hirsch, S{\"o}ren}, title = {Behavior of Current Flow on Lead Zirconate Titanate Surfaces during Mechanical Impact}, series = {Research \& Reviews: Journal of Material Sciences}, journal = {Research \& Reviews: Journal of Material Sciences}, number = {Ausgabe: 1/ Band: 4}, publisher = {Research and Reviews}, issn = {23216212}, doi = {10.4172/2321-6212.1000137}, year = {2016}, language = {en} } @inproceedings{SchmidtOseevLucklumetal.2015, author = {Schmidt, Marc-Peter and Oseev, Aleksandr and Lucklum, Ralf and Hirsch, S{\"o}ren}, title = {Technology towards a SAW based phononic crystal sensor}, series = {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}, booktitle = {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}, editor = {S{\´a}nchez-Rojas, Jos{\´e} Luis and Brama, Riccardo}, doi = {10.1117/12.2178810}, year = {2015}, language = {en} } @inproceedings{OseevSchmidtLucklumetal.2015, author = {Oseev, Aleksandr and Schmidt, Marc-Peter and Lucklum, Ralf and Zubtsov, Mikhail and Hirsch, S{\"o}ren}, title = {Phononic crystal based liquid sensor governed by localized defect resonances}, series = {Konferenz: IEEE Symposium (IUS) Ultrasonics, 2015/ Titel: 2015 IEEE International Ultrasonics Symposium (IUS)}, booktitle = {Konferenz: IEEE Symposium (IUS) Ultrasonics, 2015/ Titel: 2015 IEEE International Ultrasonics Symposium (IUS)}, publisher = {IEEE}, address = {Taipei, Taiwan}, isbn = {978-1-4799-8182-3}, doi = {10.1109/ULTSYM.2015.0053}, pages = {1 -- 4}, year = {2015}, language = {en} } @inproceedings{SchmidtOseevEngeletal.2015, author = {Schmidt, Marc-Peter and Oseev, Aleksandr and Engel, Christian and Brose, Andreas and Hirsch, S{\"o}ren}, title = {A7.1 - Flexible free-standing SU-8 microfluidic impendance spectroscopy sensor for 3D molded interconnect devices application}, series = {Konferenz: AMA Conferences 2015/ Titel: Proceedings SENSOR 2015}, booktitle = {Konferenz: AMA Conferences 2015/ Titel: Proceedings SENSOR 2015}, publisher = {AMA Service GmbH}, address = {N{\"u}rnberg, Germany}, isbn = {978-3-9813484-8-4}, doi = {10.5162/sensor2015/A7.1}, pages = {151 -- 155}, year = {2015}, language = {en} } @article{AmanMajcherekHirsch2015, author = {Aman, Alexander and Majcherek, Soeren and Hirsch, S{\"o}ren}, title = {Microwave Emission of Carbon Fibres During Electrical Breakdown}, series = {Sensor Letters}, journal = {Sensor Letters}, number = {Ausgabe: 1/ Heft: 13}, publisher = {American Scientific Publishers}, issn = {1546198X, 15461971}, doi = {10.1166/sl.2015.3408}, pages = {98 -- 101}, year = {2015}, language = {en} } @inproceedings{BraemerViebackSchilleretal.2015, author = {Br{\"a}mer, Stefan and Vieback, Linda and Schiller, Gregor and Hirsch, S{\"o}ren}, title = {Situiertes Lernen in der dualen Berufsausbildung. Entwicklung eines Lehr-Lern-Arrangements f{\"u}r den Ausbildungsinhalt „Sicherheit und Gesundheitsschutz bei der Arbeit"}, series = {Konferenz: 61. GfA-Fr{\"u}hjahrskongress, 2015/ Titel: Verantwortung f{\"u}r die Arbeit der Zukunft 61. GfA-Fr{\"u}hjahrskongress, 25. - 27.02.2015, Karlsruhe}, booktitle = {Konferenz: 61. GfA-Fr{\"u}hjahrskongress, 2015/ Titel: Verantwortung f{\"u}r die Arbeit der Zukunft 61. GfA-Fr{\"u}hjahrskongress, 25. - 27.02.2015, Karlsruhe}, publisher = {GfA-Press}, address = {Dortmund}, isbn = {978-3-936804-18-8}, year = {2015}, language = {de} } @article{MajcherekAmanHirschetal.2015, author = {Majcherek, Soeren and Aman, A. and Hirsch, S{\"o}ren and Schmidt, B.}, title = {Silicon based in-situ measurement system for flex loads on MLCCs in PCB manufacturing chain}, series = {Sensors and Actuators A: Physical}, journal = {Sensors and Actuators A: Physical}, number = {233}, publisher = {Elsevier}, issn = {09244247}, doi = {10.1016/j.sna.2015.06.005}, pages = {267 -- 274}, year = {2015}, language = {en} } @article{KuznetsovFroripSuenteretal.2023, author = {Kuznetsov, Arthur and Frorip, Aleksandr and S{\"u}nter, Alar and Kasvand, Nensi and Korsakov, Vadim and Konoplev, Georgii and Stepanova, Oksana and Rusalepp, Linda and Anton, Dea and P{\"u}ssa, T{\~o}nu and Roasto, Mati and Abramova, Liubov and Kozin, Andrey and Toom, Lauri and Hirsch, S{\"o}ren and Mukhin, Nikolay}, title = {Fast Protein and Metabolites (Nucleotides and Nucleosides) Liquid Chromatography Technique and Chemical Sensor for the Assessment of Fish and Meat Freshness}, series = {Chemosensors}, journal = {Chemosensors}, number = {1/2023 / Band 11}, editor = {mdpi,}, publisher = {MDPI}, issn = {2227-9040}, doi = {10.3390/chemosensors11010069}, pages = {69}, year = {2023}, abstract = {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.}, language = {en} } @article{KuznetsovFroripSuenteretal.2022, author = {Kuznetsov, Artur and Frorip, Aleksandr and S{\"u}nter, Alar and Korsakov, Vadim and Konoplev, Georgii and Stepanova, Oksana and Roschina, Natalia and Ovsyannikov, Nikolay and Lialin, Daniil and Gerasimchuk, Roman and Dmitriev, Alexander and Mukhin, Nikolay and Hirsch, S{\"o}ren}, title = {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}, series = {Chemosensors}, volume = {10}, journal = {Chemosensors}, number = {6}, publisher = {MDPI}, doi = {10.3390/chemosensors10060232}, year = {2022}, language = {en} } @article{KonoplevAgafonovaBakhchovaetal.2022, author = {Konoplev, Georgii and Agafonova, Darina and Bakhchova, Liubov and Mukhin, Nikolay and Kurachkina, Marharyta and Schmidt, Marc-Peter and Verlov, Nikolay and Sidorov, Alexander and Oseev, Aleksandr and Stepanova, Oksana and Kozyrev, Andrey and Dmitriev, Alexander and Hirsch, S{\"o}ren}, title = {Label-Free Physical Techniques and Methodologies for Proteins Detection in Microfluidic Biosensor Structures}, series = {Biomedicines}, volume = {10}, journal = {Biomedicines}, number = {2}, publisher = {MDPI}, issn = {2227-9059}, doi = {10.3390/biomedicines10020207}, pages = {207}, year = {2022}, language = {en} } @inproceedings{KerstenBuzinHirsch2024, author = {Kersten, Philipp and Buzin, Johannes and Hirsch, S{\"o}ren}, title = {Wireless Sensor Nodes for Condition Based Maintenance in Railway Systems}, series = {IEEE Sensors Conference, Kobe, Japan, 2024}, booktitle = {IEEE Sensors Conference, Kobe, Japan, 2024}, publisher = {IEEE}, doi = {10.1109/SENSORS60989.2024.10784508}, pages = {1 -- 4}, year = {2024}, abstract = {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.}, language = {en} } @article{DaupayevEngelHirsch2025, author = {Daupayev, Nursultan and Engel, Christian and Hirsch, S{\"o}ren}, title = {Two-to-One Trigger Mechanism for Event-Based Environmental Sensing}, series = {Sensors}, volume = {25}, journal = {Sensors}, number = {13}, publisher = {MDPI}, doi = {10.3390/s25134107}, pages = {1 -- 18}, year = {2025}, abstract = {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.}, language = {en} } @inproceedings{DaupayevReberBendyketal.2025, author = {Daupayev, Nursultan and Reber, Paul and Bendyk, Ricky and Engel, Christian and Hirsch, S{\"o}ren}, title = {Data Reduction for Energy-Constrained Sensors via Event-Aware Sampling}, series = {Konferenz: 2025 IEEE SENSORS, Vancouver, BC, Canada, 2025}, booktitle = {Konferenz: 2025 IEEE SENSORS, Vancouver, BC, Canada, 2025}, publisher = {IEEE}, isbn = {979-8-3315-4467-6}, issn = {2168-9229}, doi = {10.1109/SENSORS59705.2025.11330656}, pages = {1 -- 4}, year = {2025}, abstract = {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.}, language = {en} } @article{MukhinSokolovaChigirevetal.2020, author = {Mukhin, Nikolay and Sokolova, Irina and Chigirev, Dmitry and Rudaja, Lyudmila and Lebedeva, Galina and Kastro, Rene and Bol'shakov, Maxim and Schmidt, Marc-Peter and Hirsch, S{\"o}ren}, title = {Composite Ferroelectric Coatings Based on a Heat-Resistant Polybenzoxazole Polymer Matrix}, series = {Coatings}, volume = {10}, journal = {Coatings}, number = {3}, publisher = {MDPI}, doi = {10.3390/coatings10030286}, pages = {286}, year = {2020}, language = {en} } @article{RedkaMukhinGrishkanichetal.2019, author = {Redka, D. and Mukhin, N. and Grishkanich, A. and Terukov, E. and Hirsch, S{\"o}ren and Ignateva, L.}, title = {NdYAG surface modification of ZnO for solar cells}, series = {Journal of Physics: Conference Series}, volume = {1410}, journal = {Journal of Physics: Conference Series}, publisher = {IOP Science}, doi = {10.1088/1742-6596/1410/1/012106}, pages = {012106}, year = {2019}, language = {en} }