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Pantoea stewartii subsp. stewartii, the causative agent of Thai jackfruit’s bronzing disease and its possible host range in Vietnam

Vo T.N. Ha Le K. Hoang Pham K. Huyen
Journal of Plant Protection Research | 2024 | vol. 64 | No 2 | 149-157 | DOI: 10.24425/jppr.2024.150249
Keywords bronzing of Thai jackfruit causal agent cross-infect host range Pantoeastewartii subsp. stewartii
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Abstract

The bronzing disease of Thai jackfruit (Artocarpus heterophyllus Lam.) has recently appeared in Vietnam, causing a significant loss for farmers, but its control method is still restricted. In this study, we identified pathogens based on morphological and molecular characterizations. A total of 25 bacterial isolates were isolated from diseased samples. The bacterium produces white or yellow pigment in culture, is gram-negative, slightly pleomorphic, non-motile, facultatively anaerobic, short-rod, and catalase-positive. It hydrolyzes gelatin and starch but not tween 80, and produces acid from glucose, sucrose, and lactose. The bacterium does not produce indole and does not produce hypersensitivity to tobacco. The results of sequencing of the encoded region of synthesis of capsular polysaccharide (cpsD) and pathogenicity-related genes HrpS confirmed that the causative agent is Pantoea stewartii subsp. stewartii. The pathogen’s possible host range could be traditional jackfruit varieties, fruits, and crops such as durian, longan, mango, tomatoes, broccoli, pumpkin, cucumber, corn, rice, sweet potatoes, water spinach, peanuts, and green beans. The P. stewartii subsp. stewartii could enter the host plant cell through open wounds or natural openings such as stomata. The results confirmed the presence of P. stewartii subsp. stewartii in Vietnam and suggest that the jackfruit tree should not be planted in plantations with these crops to prevent cross-contamination and the spread of pathogens.
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Authors and Affiliations

Vo T.N. Ha
1
Le K. Hoang
1
Pham K. Huyen
1
  1. Plant Protection Department, Nong Lam University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City 700000, Viet Nam

Numerical analysis of SiGeSn/GeSn interband quantum well infrared photodetector

P. Pareek M.K. Das S. Kumar
Opto-Electronics Review | 2018 | vol. 26 | No 2 | 149-157
Keywords GeSn QWIP Strain balanced Sn composition Bandwidth Responsivity
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Abstract

In this paper, detailed theoretical investigation on the frequency response and responsivity of a strain balanced SiGeSn/GeSn quantum well infrared photodetector (QWIP) is made. Rate equation and continuity equation in the well are solved simultaneously to obtain photo generated current. Quantum mechanical carrier transport like carrier capture in QW, escape of carrier from the well due to thermionic emission and tunneling are considered in this calculation. Impact of Sn composition in the GeSn well on the frequency response, bandwidth and responsivity are studied. Results show that Sn concentration in the GeSn active layer and applied bias have important role on the performance of the device. Significant bandwidth is obtained at low reverse bias voltage, e.g., 200 GHz is obtained at 0.28 V bias for a single Ge0.83Sn0.17 layer. Whereas, the maximum responsivity is of 8.6 mA/W at 0.5 V bias for the same structure. However, this can be enhanced by using MQW structure.

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Authors and Affiliations

P. Pareek
M.K. Das
S. Kumar

The Effect of Carbide Concentration at Grain Boundaries on Thermal Stresses in Castings for Heat Treatment Furnace Tooling

A. Bajwoluk P. Gutowski
Archives of Foundry Engineering | 2024 | vol. 24 | No 1 | 149-157 | DOI: 10.24425/afe.2024.149263
Keywords Cast grates thermal stresses Heat treatment equipment Thermal shock
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Abstract

Austenitic Fe-Ni-Cr alloys are commonly used for the production of castings intended for high-temperature applications. One area where Fe-Ni-Cr castings are widely used is the equipment for heat treatment furnaces. Despite the good heat resistance properties of the materials used for the castings, they tend to develop cracks and deformations over time due to cyclic temperature changes experienced under high temperature operating conditions. In the case of carburizing furnace equipment, thermal stresses induced by the temperature gradient in each operating cycle on rapidly cooled elements have a significant influence on the progressive fatigue changes. In the carburized subsurface zone, also the different thermal expansion of the matrix and non-metallic precipitates plays a significant role in stress distribution. This article presents the results of analyses of thermal stresses in the surface and subsurface layer of carburized alloy during cooling, taking into account the simultaneous effect of both mentioned stress sources. The basis for the stress analyzes were the temperature distribution in the cross-section of the cooled element as a function cooling time, determined numerically using FEM. These distributions were taken as the thermal load of the element. The study presents the results of analyses on the influence of carbide concentration increase on stress distribution changes caused by the temperature gradient. The simultaneous consideration of both thermal stress sources, i.e. temperature gradient and different thermal expansions of phases, allowed for obtaining qualitatively closer results than analyzing the stress sources independently
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Authors and Affiliations

A. Bajwoluk
1
ORCID: ORCID
P. Gutowski
1
ORCID: ORCID
  1. Mechanical Engineering Faculty, West Pomeranian University of Technology, Szczecin Al. Piastów 19, 70-310 Szczecin, Poland

The cartographic development of the decision charts technique

Ireneusz Wyczałek
Geodesy and Cartography | 2001 | vol. 50 | No 3 | 149-157
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Abstract

Among methods of solving decision matters the technique of decision charts has been presented in this paper and the idea of their cartographic development has been proposed. The problem has been described on the base of real application that concern of choosing a place on water intake for new arisen housing estate. The technique of colour scale for visualization of choice criteria and logical operations on colour images has been proposed in order to find the place which meet earlier formulated conditions in the best way. The results has been colected in modified decision chart. Next possibilities of development of the method have been indicated
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Authors and Affiliations

Ireneusz Wyczałek

Convection and heat transfer analysis of Cu-water rotatory flow with non-uniform heat source

Alfunsa Prathibaa P. Johnson Babub Manthri Sathyanarayanac B. Tulasi Lakshmi Devid Shanker Bandarie
Archives of Thermodynamics | 2024 | vol. 45 | No 3 | 149-157 | DOI: 10.24425/ather.2024.151225
Keywords Coriolis force Lobatto IIIA technique Richardson number Volume fraction of Cu nanoparticle Non-uni-form heat source
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Abstract

This article explores the phenomenon of natural convection in the rotatory flow of Cu-water nanofluid under the influence of non-uniform heat source. In order to design more effective and efficient cooling systems, this work attempts to increase our understanding of how nanofluids behave in the presence of non-uniform heat sources, convection, and rotatory force. The higher order partial differential equations governing the flow are remodelled into ordinary differential equations using similarity transformations. The remodelled equations were solved using shooting methodology and the Lobatto-III A algorithm. The impacts of various parameters such as the Richardson number (1 < Ri < 4), the Schmidt number (0.5 < Sc < 2), nanoparticle’s volume fraction (0.02 < ϕ < 0.08), etc. on velocity, concentration and temperature was ana-lysed. One of the main findings of this analysis was study of the impact of the space dependent heat source (0.2 ≤ A ≤ 1) and the temperature dependent internal heat source (0 ≤ B ≤ 0.5) on the heat regulation. Furthermore, increasing the quantity of the nano-additives and improving the fluid’s thermophysical properties intensified the acceleration of the fluid elements in the flow region. The presence of spatial and temperature-sensitive parameters facilitated quantification of the effects of a standard and variable heat source in combination of Coriolis force in the case of a Cu-water flow. The findings of the investigation will be helpful in the process of medical, architectural planning systems, oil recovery systems and so on.
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Authors and Affiliations

Alfunsa Prathibaa
1
P. Johnson Babub
2
Manthri Sathyanarayanac
3
B. Tulasi Lakshmi Devid
4
Shanker Bandarie
5
  1. Department of Mathematics, CVR College of Engineering, Hyderabad, India
  2. Department of Physics and Electronics, St. Joseph’s Degree & PG College, 5-9-1106 King Koti, Main Road, Hyderabad - 500029, Telangana, India
  3. Department of Mathematics & Statistics, St.Joseph's Degree & PG College, 5-9-1106 King Koti, Main Road, Hyderabad - 500029, Telangana, India
  4. Department of Mathematics, Koneru Lakshmaiah Education Foundation, Telangana, India
  5. Department of Humanities and Sciences, CVR College of Engineering, Telangana, India

Biographical sketch of Jerzy Ignacy Skowroński

Krystian Leonard Chrzan
Nauka | 2021 | No 1 | 149-157 | DOI: 10.24425/nauka.2021.136310
Keywords Jerzy Ignacy Skowroński electrical engineering high voltage insulation
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Abstract

The life of Jerzy Ignacy Skowronski, Professor of High Voltages, Dean of the Faculty of Mechanical and Electrical Engineering and the first Dean of the Electrical Faculty of the Wrocław University of Science and Technology, member of the real Polish Academy of Sciences and President of the Wrocław Scientific Society, founder of the Wrocław Scientific School of Electrical Materials, was described. Documents contained in the Archives of the Wrocław University of Science and Technology, works published by Jerzy I. Skowronski, previously published publications on his scientific merits written by his former Ph.D. students and information from his grandson Jan Paweł Skowronski were used. The author's intention was to show unknown facts from the life of the Professor and his works unknown until now.
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Authors and Affiliations

Krystian Leonard Chrzan
1
  1. Politechnika Wrocławska

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