1. Improving uncertainty of strain gauge bridge standardsMiha Hiti, 2018, published scientific conference contribution Abstract: The article proposes a procedure for calibration of strain gauge bridge standards with improved relative calibration uncertainty. In contrast to a typical calibration with voltage ratio standards or comparison calibration with other bridge standards, the proposed procedure uses a calibrated reference bridge amplifier, additionally evaluated using combinatorial calibration technique to improve its calibration uncertainty. The resulting uncertainty of ratio steps referenced to zero ratio step is lower than the traditional uncertainty achieved through direct independent traceability to mVV−1 ratio values. The proposed procedure enables direct application of the calibrated bridge standard values with low relative uncertainty for calibration of bridge amplifiers, without the need for additional combinatorial evaluation of each individual bridge amplifier.
Keywords: voltage ratio, linearity check, bridge standard, calibration
Published in DiRROS: 05.04.2024; Views: 77; Downloads: 55
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2. Entering voltage hysteresis in phase-separating materials : revealing the electrochemical signature of the intraparticle phase-separated stateTomaž Katrašnik, Jože Moškon, Klemen Zelič, Igor Mele, Francisco Ruiz-Zepeda, Miran Gaberšček, 2023, original scientific article Abstract: Hysteresis is a general phenomenon regularly observed in various materials. Usually, hysteretic behavior is an intrinsic property that cannot be circumvented in the non-equilibrium operation of the system. Herein, we show that, at least with regard to the hysteretic behavior of phase-separating battery materials, it is possible to enter (deeply) the hysteretic loop at finite battery currents. This newly observed electric response of the electrode, which is inherent to phase-separating materials, is, for the first time, related to its microscopic origin arising from a (significant) share of the active material residing in an intraparticle phase-separated state. This intriguing observation was further generalized by revealing that a phase-separating material can feature (significantly) different chemical potentials at the same bulk lithiation level and temperature when exposed to the same finite current and external voltage hysteresis. Therefore, the intraparticle phase-separated state significantly affected the DC and AC characteristics of the battery. The experimental evidence for entering the intraparticle phase-separated state is supported by thermodynamic reasoning and advanced modeling. The current findings will help advance the understanding, control, diagnostics, and monitoring of batteries composed of phase-separating materials while also providing pertinent motivation for the enhancement of battery design and performance.
Keywords: battery, phase-separating materials, Lithium iron phosphate, voltage hysteresis, intraparticle phase-separated
Published in DiRROS: 06.09.2023; Views: 354; Downloads: 172
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3. Influence of voltage and current on the arc shape in cable-type wire TIG-MIG hybrid weldingChao Zhang, Qingxian Hu, Xiaoli Wang, Zhuang Dong, Daozhong Du, 2022, original scientific article Keywords: tungsten inert gas welding, metal inert gas welding, cable-type wire, arc shape, voltage, current
Published in DiRROS: 22.06.2022; Views: 457; Downloads: 121
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4. Modified design structure of a metamaterial microstrip patch array antenna for RF energy optimizationBeulah Jackson, R Saravanakumar, Bhuvaneswari Balachander, Anandakumar Haldorai, S. Varalakshmi, Luc Anselin, 2022, original scientific article Keywords: patch antenna, WLAN, RF energizer, voltage rectifier, VSWR
Published in DiRROS: 22.06.2022; Views: 424; Downloads: 78
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