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2022 ◽  
Vol 1049 ◽  
pp. 102-107
Author(s):  
Aleksandr A. Ragazin ◽  
Vasiliy V. Yashin ◽  
Ilya A. Latushkin ◽  
Evgenii V. Aryshesnkii ◽  
Fedor V. Grechnikov

Objective of the study: study of various homogenization modes effects on mechanical and corrosive properties of rolled sheets from Al-Mg system alloy 1570 with additions of zirconium and scandium transition metals. The sheets were produced in laboratory conditions from the ingot, cast in production DC mold based on the commercial production practices and treatment modes. 4 homogenization modes, 2 tempers H12 and H321, and several modes of stabilization annealing in the temperature range from 240 °C to 325 °C have been reviewed. The samples have been comprehensively examined using optic and electron scanning microscope, mechanical properties were achieved by break test in compliance with ISO 6892-1, corrosion was examined using ASTM G66 and G67 standards. The curve of 1570 alloy sheets softening as the function of annealing temperature was constructed. It was demonstrated that the increasing temperature effect during homogenization leads to strength properties decrease and corrosion resistance improvement due to interdendritic segregation elimination. Among analyzed homogenization modes, 360 - 380 °C - 6 h mode is established as the most practical, and the sheets. produced without stabilization annealing, occurred to be the most resistant to exfoliation corrosion. The sheets, subjected to annealing at 260 °C - 2 h, show no traces of layer corrosion, but have pit corrosion locations rated as «PC» based on ASTM G-66 classification, such rating is unacceptable for the manufacture of products for use in the marine environment.


2022 ◽  
pp. 417-434
Author(s):  
Toyoki Kozai ◽  
Yumiko Amagai ◽  
Na Lu ◽  
Eri Hayashi ◽  
Yasuomi Ibaraki ◽  
...  

Author(s):  
Omar Beckers ◽  
Sander Smeets ◽  
Laurence Lutsen ◽  
Wouter Maes

Continuous flow chemistry offers a fast entry to commercial production for innovative polymers of diverse nature. A field that could hugely benefit from this gateway is organic electronics. For some...


2021 ◽  
Vol 6 (4) ◽  
Author(s):  
Aminu Saleh

Post-harvest processes of millet rely on labour-intensive manual operations in Nigeria while its produce is associated with contaminants. A manually-operated destoner was developed to increase grain value for commercial production and reduce drudgery. To construct the destoner sieves, physical properties of one thousand randomly selected grains were determined digital Vernier callipers. Millet grains to be destoned was fed through the upper portion of the destoner being operated through the crank handle while the pure grains were collected at the discharge outlet. Results obtained shows the geometric diameter of the grains increase progressively from 3.51-4.22mm as moisture content increases. A screen aperture of 3.5mm was constructed. Grains’ surface area, volume and sphericity increased from 22.67-34.82mm², 8.19-13.98mm³ and 0.691-0.776g respectively. Mass, true density and terminal velocity of 1000 seed increased from 13.56-43.84g, 1548.91-1689.87kg/m³ and 2.69-4.58m/s respectively. The bulk density of millet also increased as moisture content increases but decreased beyond 12.5% moisture level indicating that millet floats on  water and was transpoted with the aid of an auger. About 50kg of millet was poured into the destoner to occupy its  ⅓ capacity while the remaining ⅔ was filled with water. Destoner output was  at 95% efficiency.Key words: Destoner, Millet, Processing, Properties, Contaminants


Author(s):  
Mohammad Yousuf Ali ◽  
Shaikh Abdus Sabur ◽  
Md Saidur Rahman ◽  
Md Abu Saiyem

Commercial gardening of Agar Plant (AP) is an emerging part of agribusiness enterprises in Bangladesh which is existence in some cases at a small scale of limit, demanding the proper strategies for prompting AP commercial production. Therefore, the objectives of the study were to identify the commercial production practices, producers’ returns and the risk-bearing ability in small-scale gardening of agar plants. Bharlekha upazila in Moulvibazar district of Bangladesh was selected as the study area. Data were collected from randomly selected eighty AP producers of that area during the year 2017.The average life of the plants is around 16 years, and the production activities are the seed and sapling collection and growing; land selection and preparation and sapling planting; intercultural operation; nail setting on agar plants; and harvesting and selling which are mainly done by the AP producers. There is a strong backward and forward linkages have been identified. Results showed that the AP plant production enterprise is highly profitable only in the long-term period of 16 years time, which is not possible in short-run. Also, the break-even analysis of AP production resists a large drop of yield and price before incurring a loss, which gives the farmers a comfortable margin of safety and a risk bearing ability. The study recommended that the government and non-government organizations should come forward to provide directions and supports for promoting and sustaining agar plant production on commercial basis throughout the country.


Fermentation ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 314
Author(s):  
Tuan-Dung Hoang ◽  
Nhuan Nghiem

Ethanol produced from various biobased sources (bioethanol) has been gaining high attention lately due to its potential to cut down net emissions of carbon dioxide while reducing burgeoning world dependence on fossil fuels. Global ethanol production has increased more than six-fold from 18 billion liters at the turn of the century to 110 billion liters in 2019, only to fall to 98.6 billion liters in 2020 due to the pandemic. Sugar cane and corn have been used as the major feedstocks for ethanol production. Lignocellulosic biomass has recently been considered as another potential feedstock due to its non-food competing status and its availability in very large quantities. This paper reviews recent developments and current status of commercial production of ethanol across the world with a focus on the technological aspects. The review includes the ethanol production processes used for each type of feedstock, both currently practiced at commercial scale and still under developments, and current production trends in various regions and countries in the world.


Marine Drugs ◽  
2021 ◽  
Vol 19 (12) ◽  
pp. 706
Author(s):  
Lianghuan Zeng ◽  
Junge Li ◽  
Yuanyuan Cheng ◽  
Dandan Wang ◽  
Jingyan Gu ◽  
...  

Recent explorations of tool-like alginate lyases have been focused on their oligosaccharide-yielding properties and corresponding mechanisms, whereas most were reported as endo-type with α-L-guluronate (G) preference. Less is known about the β-D-mannuronate (M) preference, whose commercial production and enzyme application is limited. In this study, we elucidated Aly6 of Flammeovirga sp. strain MY04 as a novel M-preferred exolytic bifunctional lyase and compared it with AlgLs of Pseudomonas aeruginosa (Pae-AlgL) and Azotobacter vinelandii (Avi-AlgL), two typical M-specific endolytic lyases. This study demonstrated that the AlgL and heparinase_II_III modules play indispensable roles in determining the characteristics of the recombinant exo-type enzyme rAly6, which is preferred to degrade M-enriched substrates by continuously cleaving various monosaccharide units from the nonreducing end, thus yielding various size-defined ΔG-terminated oligosaccharides as intermediate products. By contrast, the endolytic enzymes Pae-rAlgL and Avi-rAlgL varied their action modes specifically against M-enriched substrates and finally degraded associated substrate chains into various size-defined oligosaccharides with a succession rule, changing from ΔM to ΔG-terminus when the product size increased. Furthermore, site-directed mutations and further protein structure tests indicated that H195NHSTW is an active, half-conserved, and essential enzyme motif. This study provided new insights into M-preferring lyases for novel resource discoveries, oligosaccharide preparations, and sequence determinations.


Marine Drugs ◽  
2021 ◽  
Vol 19 (12) ◽  
pp. 703
Author(s):  
Donghua Xia ◽  
Wen Qiu ◽  
Xianxian Wang ◽  
Junying Liu

Microalgal cells serve as solar-powered factories that produce pharmaceuticals, recombinant proteins (vaccines and drugs), and valuable natural byproducts that possess medicinal properties. The main advantages of microalgae as cell factories can be summarized as follows: they are fueled by photosynthesis, are carbon dioxide-neutral, have rapid growth rates, are robust, have low-cost cultivation, are easily scalable, pose no risk of human pathogenic contamination, and their valuable natural byproducts can be further processed. Despite their potential, there are many technical hurdles that need to be overcome before the commercial production of microalgal pharmaceuticals, and extensive studies regarding their impact on human health must still be conducted and the results evaluated. Clearly, much work remains to be done before microalgae can be used in the large-scale commercial production of pharmaceuticals. This review focuses on recent advancements in microalgal biotechnology and its future perspectives.


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