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Dynamic States Equations of Transport Pipeline in Deep-Sea Mining

Jerzy Sobota Xia Jianxin Evgeniy Kirichenko
Archives of Mining Sciences | 2021 | vol. 66 | No 3 | 385-392 | DOI: 10.24425/ams.2021.138595
Keywords deep-sea mining vertical pipelines stability of deep-sea pipelines
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Abstract

The transport pipeline of lifting the underwater minerals to the surface of the water onto the ship during the movement of the vessel takes in the water a curved deformed shape. Analysis of the state of stability of the pipeline showed that if the flow velocity of fluid in the pipeline exceeds a certain critical value Vkr, then its small random deviations from the equilibrium position may develop into deviations of large amplitude. The cause of instability is the presence of the centrifugal force of the moving fluid mass, which occurs in places of curvature of the axis of the pipeline and seeks to increase this curvature when the ends of the pipeline are fixed. When the critical flow velocity is reached, the internal force factors become unable to compensate for the action of centrifugal force, as a result of that a loss of stability occurs. Equations describing this dynamic state of the pipeline are presented in the article.
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Bibliography

[1] Benjamin T .B. Dynamic of a system of articulated pipes conveying fluid. I Theory. Proc. Royal Soc. 261, 457-486 (1961), II Experiment, 487-99.
[2] Chung J .S., Bao-Rang Cheng, Huttelmaier H .P. Three-Dimensional Coupled Responses of a Vertical Deep-Ocean Pipe: Part II. Excitation at Pipe Top and External Torsion, International Journal of Offshore and Polar Engineering 4, 4, December 1994 (ISSN 1053-5381).
[3] Goman O.G., Kirichenko E.A., Vishnyak E.A. Calculation of hydrodynamic loads on the elements of submersible structures of deep-water slurry pipelines. System Technologies: A collection of scientific papers – Dnipropetrovsk: RVKIA Ukraine 8, 17-23 (1999) [in Russian].
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[6] Kirichenko E.A. Possible cases of simplification of the system of equations of oscillations of deep-water slurry pipelines in a flat formulation. Mining, electromechanics and automatics: A collection of scientific papers – Dnipropetrovsk: RVKNGA of Ukraine 4, 137-142 (1999) [in Russian].
[7] Long R.H. Jr. Experimental and theoretical study of transverse vibration of a tube containing flowing fluid. J. App. Mech. 22, 1, 65-68 (1955).
[8] Niordson F .I.N. Vibrations of cylindrical tube containing flowing fluid. Trans. of the Royal Inst. of Tech., Stockholm, Sweden, 1953, No.73. 392
[9] Szelangiewicz T., Żelazny K., Buczkowski R., Computer simulations of deformations and tensions in the pipelines of hydraulic lifting systems, Scientific Journals of the Maritime University of Szczecin – Zeszyty Naukowe Akademii Morskiej w Szczecinie 52 (124), 37-44 (2017). DOI : https://doi.org/10.17402/243
[10] Yao Nijun, Cao Bin, Xia Jianxin, Pressure loss of flexible hose in deep-sea mining system. 18th International Conference on TRANSPORT AND SEDIMENTATION OF SOLID PARTICLES 11-15 September 2017, Prague, Czech Republic. ISBN 978-83-7717-269-8.
[11] Yu Hong-yun, Liu Shao-jun, Dynamics of vertical pipe in deep-ocean mining system, J. Cent. South Univ. Technol. (2007) 04-0552-05. DOI : https://doi.org/10.1007/s11771-007-0106-0
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Authors and Affiliations

Jerzy Sobota
1
ORCID: ORCID
Xia Jianxin
2
ORCID: ORCID
Evgeniy Kirichenko
3
ORCID: ORCID
  1. Wrocław University of E nvironmental and Life Sciences, Poland
  2. Minzu University of China, Beijing, China
  3. Mining University, Dnipropetrovsk, Ukraine

On Suitability of Day-Night Average Sound Level Descriptor in Indian Scenario

Naveen Garg
Archives of Acoustics | 2019 | vol. 44 | No 2 | 385-392 | DOI: 10.24425/aoa.2019.128502
Keywords National Ambient Noise Monitoring Network (NANMN) day equivalent sound level, Lday night equivalent sound level, Lnight day-night average sound level, Ldn day-evening-night average soundlevel, Lden equivalent continuous sound level, LAeq 24h
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Abstract

The paper analyzes the monthly day equivalent levels, Lday (06–22 h) and night equivalent levels, Lnight (22–06 h) values observed in year 2015 and 2016 for the 70 locations whereby continuous noise monitoring is conducted under the National Ambient Noise Monitoring Network (NANMN). The study exclusively analyzes the ambient noise data acquired for 25 locations in commercial zone, 12 in industrial, 16 in residential and 17 in silence zones. The analysis of (Lday–Lnight) for 70 locations under observations reveals that 10 dB night time adjustment in day-night average sound level descriptor is not appropriate in such a scenario and as such it is recommended to use day-night average sound level and day-eveningnight average sound level descriptors without any 10 dB night time adjustment or 5 dB evening time adjustments. The analysis and conclusions of the present study shall be very useful for developing single value noise descriptor correlating the noise annoyance and health effects in Indian perspectives.

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Authors and Affiliations

Naveen Garg

Human health risk assessment of pesticide residues in fruit, vegetable and cereal samples from Poland – a 5-year survey

Magdalena Jankowska Izabela Hrynko Bożena Łozowicka
Journal of Plant Protection Research | 2022 | vol. 62 | No 4 | 385–392 | DOI: 10.24425/jppr.2022.143231
Keywords agricultural plants dietary exposure hazard quotient pesticide residues risk assessment
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Abstract

Human health risk assessment of pesticide residues in agricultural commodities is a key element of food safety strategy. The present study focused on potential risks resulting from selected fruit, vegetable and cereal samples with pesticide residues exceeding maximum residue levels (MRLs) from a 5-year survey of official control in Poland (2017–2021). A novel, common tool, the EFSA Pesticide Residue Intake Model PRIMo was used for short-term exposure calculation with embedded consumption data from EU Member States. The challenge of the research was to determine whether the International Estimated Short Time Intakes (IESTI) of toxic pesticides in the diet are acceptable or not. For the first time with long-term investigation which involved many legislative changes, we prepared a picture of the most dangerous pesticides present in fruits, vegetables and cereals for the most critical sub-populations of adults and children. We examined whether these substances have the potential to cause harm to humans. From the full spectrum of 545 analyzed pesticides, we considered 13 pesticides above safety limits in the concentration range of 0.03 to 2.5 mg · kg –1. The most frequently detected compound was the non-authorized, organophospate insecticide chlorpyrifos, which poses toxicological risks to humans. The results of acute exposure were up to 93% ARfD for adults and up to 130% for children. The Hazard Quotient (HQ) showed that consumption of agricultural plants with potential risk can be safe for adults and children, with some exceptions. Samples containing flonicamid/Brussel sprouts (HQ = 1.3) and chlorpyrifos/rucola (HQ = 1.1) could have negative health effects on humans. However, an approach which overestimates the exposure due to a worst-case scenario ensures the widest possible safety margin for the consumers.
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Authors and Affiliations

Magdalena Jankowska
1
ORCID: ORCID
Izabela Hrynko
1
ORCID: ORCID
Bożena Łozowicka
1
ORCID: ORCID
  1. Laboratory of Food and Feed Safety, Institute of Plant Protection – NRI, Bialystok, Poland

Plasma levels of chemokines CCL2 and CXCL12 in female dogs with malignant mammary gland tumours without and with metastases

M. Szczubiał W. Łopuszyński R. Dąbrowski M. Jamioł M. Bochniarz P. Brodzki
Polish Journal of Veterinary Sciences | 2023 | vol. 26 | No 3 | 385–392 | DOI: 10.24425/pjvs.2023.145044
Keywords canine mammary tumours CCL2 chemokines CXCL12 metastases plasma
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Abstract

The aim of this study was to evaluate the plasma levels of chemokines CCL2 and CXCL12 in female dogs with malignant mammary gland tumours without and with metastases. The concentrations of CCL2 and CXCL12 were determined in 25 female dogs with malignant mammary gland tumours (15 without metastases and 10 with metastases) and 10 healthy control animals using a specific canine ELISA assay. The mean plasma concentrations of CCL2 and CXCL12 were significantly higher (p<0.05) in the metastatic group compared to the control group. Moreover, the concentrations of these chemokines were markedly higher in the dogs with metastases than in those without metastases; however, a statistically significant difference was not found. The concentrations of both tested chemokines were numerically increased in the dogs with grade 2 and grade 3 carcinomas compared to the dogs with grade 1 carcinomas but the differences did not reach statistical significance. In conclusion, the results of our study demonstrate that plasma concentrations of chemokines CCL2 and CXCL12 are significantly increased in the dogs with metastatic malignant mammary gland tumours compared to the healthy dogs and show an upward trend compared to those without metastases. However, clarifying whether the increase of these chemokines is a cause or an effect of metastasis in female dogs with malignant mammary gland tumours as well as their potential role in metastatic process requires further research.
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Authors and Affiliations

M. Szczubiał
1
W. Łopuszyński
2
R. Dąbrowski
1
M. Jamioł
3
M. Bochniarz
1
P. Brodzki
1
  1. Department and Clinic of Animal Reproduction, Faculty of Veterinary Medicine, University of Life Sciences, Gleboka 30, 20-612 Lublin, Poland
  2. Department of Pathomorphology and Forensic Veterinary Medicine, Faculty of Veterinary Medicine, University of Life Sciences, Gleboka 30, 20-612 Lublin, Poland
  3. Department of Animal Biochemistry, Faculty of Veterinary Medicine, University of Life Sciences, Akademicka 12, 20-033 Lublin, Poland

Novel ultrasonic distance measuring system based on correlation method

K. Gądek M. Jaraczewski
Archives of Electrical Engineering | 2014 | vol. 63 | No 3 September | 385-392 | DOI: 10.2478/aee-2014-0028
Keywords ultrasonic measurements non-destructive testing delay measurement algorithm phase correlation
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Abstract

This paper presents an innovative method for measuring the time delay of ultrasonic waves. Pulse methods used in the previous studies was characterized by latency. The method of phase correlation, presented in this article is free from this disadvantages. Due to the phase encoding with the use of Walsh functions the presented method allows to obtain better precision than previous methods. The algorithm to measure delay of the reflected wave with the use of microprocessor ARM Cortex M4 linked to a PC has been worked out and tested. This method uses the signal from the ultrasonic probe to precisely determine the time delay, caused by the propagation in medium, possible. In order to verify the effectiveness of the method a part of the measuring system was implemented in LabVIEW. The presented method proved to be effective, as it is shown in presented simulation results.
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Authors and Affiliations

K. Gądek
M. Jaraczewski

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