Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 3
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

In this study defense responses in three potato varieties with different levels of reaction to the late blight disease caused by Phytophthora infestans were analyzed after inoculation with the pathogen. In the resistant cv. Pastusa Suprema, increased intensity of H2O2 and callose deposit accumulation was observed beginning at 24 hours after inoculation, followed by a hypersensitive response at the inoculation points. In the moderately resistant cv. Diacol-Monserrate, the same responses were observed as in the resistant variety, but with less intensity over time. For the susceptible cv. Diacol-Capiro, the responses observed occurred later than in the other two varieties, subsequent to the advance of the pathogen over extensive necrotic areas. These results suggest that early, intense peroxide and callose accumulation and a hypersensitive response are associated with the observed resistance of the cv. Pastusa Suprema and cv. Diacol-Monserrate to P. infestans.

Go to article

Authors and Affiliations

Astrid Elena Gaviria
Luis Fernando Patiño
Juan Gonzalo Morales
Download PDF Download RIS Download Bibtex

Abstract

A dynamic weighing system or a checkweigher is an automated inspection system that measures the weight of objects while transferring them between processes. In our previous study, we developed a new electromagnetic force compensation (EMFC) weighing cell using magnetic springs and air bearings. This weighing cell is free from flexure hinges which are vulnerable to shock and fatigue and also eliminates the resonance characteristics and implements a very low stiffness of only a few N/m due to the nature of the Halbach array magnetic spring. In this study, we implemented a checkweigher with the weighing cell including a loading and unloading conveyor to evaluate its dynamic weighing performances. The magnetic springs are optimized and re-designed to compensate for the weight of a weighing conveyor on the weighing cell. The checkweigher has a weighing repeatability of 23 mg (1σ) in static situation. Since there is no lowfrequency resonance in our checkweigher that influences the dynamic weighing signal, we could measure the weight by using only a notch filter at high conveyor speeds. To determine the effective measurement time, a dynamic weighing process model is used. Finally, the proposed checkweigher meets Class XIII of OIML R51-1 of verification scale e 0.5 g at a conveyor speed of up to 2.7 m/s.
Go to article

Bibliography

[1] Schwartz, R. (2000). Automatic weighing-principles, applications and developments. Proceedings of XVI IMEKO, Austria, 259–267.
[2] Yamazaki, T., & Ono, T. (2007). Dynamic problems in measurement of mass-related quantities. Proceedings of the SICE Annual Conference, Japan, 1183–1188. https://doi.org/10.1109/SICE.2007.4421164.
[3] Mettler-Toledo GmbH. (2021, June 13). https://www.mt.com/.
[4] Yamakawa, Y., Yamazaki, T., Tamura, J., & Tanaka, O. (2009). Dynamic behaviors of a checkweigher with electromagnetic force compensation. Proceedings of the XIX IMEKO, Portugal, 208– 211. https://www.imeko.org/publications/wc-2009/IMEKO-WC-2009-TC3-184.pdf.
[5] Yamakawa, Y., & Yamazaki, T. (2010). Dynamic behaviors of a checkweigher with electromagnetic force compensation (2nd report). Proceedings of the XIX IMEKO, Portugal. https://www.imeko.org/publications/tc3-2010/IMEKO-TC3-2010-001.pdf.
[6] Yamakawa, Y., & Yamazaki, T. (2013). Simplified dynamic model for high-speed checkweigher. International Journal of Modern Physics. 24, 1–8. https://doi.org/10.1142/S2010194513600367.
[7] Yamakawa, Y., & Yamazaki, T. (2015). Modeling and control for checkweigher on floor vibration. Proceedings of the XXI IMEKO, Czech Republic. https://www.imeko.org/IMEKO-WC-2015- TC3-093.pdf.
[8] Yamazaki, T., Sakurai, Y., Ohnishi, H., Kobayashi, M., & Kurosu, S. (2002). Continuous mass measurement in checkweighers and conveyor belt scales. Proceedings of the SICE Annual Conference, 470–474. https://doi.org/10.1109/SICE.2002.1195446.
[9] Sun, B., Teng, Z., Hu, Q., Lin, H., & Tang, S. (2020). Periodic noise rejection of checkweigher based on digital multiple notch filter. IEEE Sensors Journal, 20(13), 7226–7234. https://doi.org/10.1109/JSEN.2020.2978232.
[10] Piskorowski, J., & Barcinski, T. (2008). Dynamic compensation of load cell response: A timevarying approach. Mechanical Systems and Signal Processing, 22(7), 1694–1704. https://doi.org/10.1016/j.ymssp.2008.01.001.
[11] Pietrzak, P., Meller, M., & Niedzwiecki, M. (2014). Dynamic mass measurement in checkweighers using a discrete time-variant low-pass filter. Mechanical Systems and Signal Processing, 48(1–2), 67–76. https://doi.org/10.1016/j.ymssp.2014.02.013.
[12] Umemoto, T., Sasamoto, Y., Adachi, M., Kagawa, Y. (2008). Improvement of accuracy for continuous mass measurement in checkweighers with an adaptive notch filter. Proceedings of the SICE Annual Conference, 1031–1035. https://doi.org/10.1109/SICE.2008.4654807.
[13] Boschetti, G., Caracciolo, R., Richiedei, D., & Trevisani, A. (2013). Model-based dynamic compensation of load cell response in weighing machines affected by environmental vibrations. Mechanical Systems and Signal Processing, 34(1–2), 116–130. https://doi.org/10.1016/j.ymssp.2012.07.010.
[14] Sun, B., Teng, Z., Hu, Q., Tang, S., Qiu, W., & Lin, H. (2020). A novel LMS-based SANC for conveyor belt-type checkweigher. IEEE Transactions on Instrumentation and Measurement, 70, 1– 10. https://doi.org/10.1109/TIM.2020.3019618.
[15] Niedzwiecki, M., Meller, M., & Pietrzak, P. (2016). System identification -based approach to dynamic weighing revisited. Mechanical Systems and Signal Processing, 80, 582–599. https://doi.org/10.1016/j.ymssp.2016.04.007.
[16] Choi, I. M., Choi, D. J., & Kim, S. H. (2001). The modelling and design of a mechanism for micro-force measurement. Measurement Science and Technology, 12(8), 1270–1278. https://doi.org/10.1088/0957-0233/12/8/339.
[17] Hilbrunner, F., Weis, H., Fröhlich, T., & Jäger, G. (2010). Comparison of different load changers for EMFC-balances. Proceedings of the IMEKO TC3, TC5, and TC22 Conferences Metrology in Modern Context, Thailand. https://www.imeko.org/publications/tc3-2010/IMEKO-TC3-2010-016.pdf.
[18] Yoon, K. T., Park, S. R., & Choi, Y. M. (2020). Electromagnetic force compensation weighing cell with magnetic springs and air bearings. Measurement Science and Technology, 32(1). https://doi.org/10.1088/1361-6501/abae8e.
[19] Zhang, H., Kou, B., Jin, Y., & Zhang, H. (2014). Modeling and analysis of a new cylindrical magnetic levitation gravity compensator with low stiffness for the 6-DOF fine stage. IEEE Transactions on Industrial Electronics, 62(6), 3629–3639. https://doi.org/10.1109/TIE.2014.2365754.
[20] Choi, Y. M., & Gweon, D. G. (2010). A high-precision dual-servo stage using Halbach linear active magnetic bearings. IEEE/ASME Transactions on Mechatronics, 16(5), 925–931. https://doi.org/10.1109/TMECH.2010.2056694.
[21] Lijesh, K. P., & Hirani, H. (2015). Design and development of Halbach electromagnet for active magnet bearing. Progress in Electromagnetics Research C, 56, 173–181. https://doi.org/10.2528/PIERC15011411.
Go to article

Authors and Affiliations

Hyun-Ho Lee
1
Kyung-Taek Yoon
1
Young-Man Choi
1

  1. Ajou University, Department of Mechanical Engineering, 206, World cup-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, Republic of Korea, Suwon, Republic of Korea
Download PDF Download RIS Download Bibtex

Abstract

This paper presents a low-cost and smart measurement system to acquire and analyze mechanical motion parameters. The measurement system integrates several measuring nodes that include one or more triaxial accelerometers, a temperature sensor, a data acquisition unit and a wireless communication unit. Particular attention was dedicated to measurement system accuracy and compensation of measurement errors caused by power supply voltage variations, by temperature variations and by accelerometers’ misalignments. Mathematical relationships for error compensation were derived and software routines for measurement system configuration, data acquisition, data processing, and self-testing purposes were developed. The paper includes several simulation and experimental results obtained from an assembled prototype based on a crank-piston mechanism

Go to article

Authors and Affiliations

J.M. Dias Pereira
Vítor Viegas
Octavian Postolache
Pedro Silva Girão

This page uses 'cookies'. Learn more