Effects Of Temperature Regimes Research Articles

Duration of the vegetation period of pea collection specimens in the Eastern Siberia

The authors presented the results of the study of the effect of temperature regime and precipitation on the duration of the growing season and its components for the crop Pisum sativum L. These studies were analyzed on the basis of three-year experiments in the conditions of Eastern Siberia and the most early maturing samples were selected. The objects of the study were 20 collection varieties of pea sowing of Russian and foreign selection. The authors conducted studies in accordance with the methodological guidelines for the study of grain legume crops collection in 2018-2020 in the forest-steppe zone of Krasnoyarsk region, on the fields of the Krasnoyarsk Research Institute of Agriculture. The soil of the experimental plot was common black earth heavyloamy. The humus content of the arable layer was 7.8 %, the pH of the salt extract was 6.8. Over the three years of the experiment, the content of nitrate nitrogen N-NO3 in the soil at the time of sowing averaged 10.12 mg/kg, mobile phosphorus P2O5 was high 23.26 mg/100 g; potassium K2O was elevated 10.06 mg/100 g (by Chirikov method). Agronomic techniques were common for grain legume crops in the region. Clean fallow was the precursor. The work aims to determine the duration of vegetation period of pea collection samples and the influence of hydrothermal conditions on it. The tasks of the study are to determine the duration of pea growing season and its components in different heat and moisture supply years. In addition, another task of the study is to determine the variability of pea plants depending on hydrothermal conditions, as well as to identify the most early-ripening varieties. The authors identifined that the maximum duration of the growing season was characteristic of excessively moist 2020. The longest period is «flowering - ripening» (38 - 49 days), the shortest period was «sowing - sprouting» (18 - 27 days). Duration of vegetation period is characterized by medium variability (Vcf = 16.5 %). Directly proportional dependence of vegetation period duration on precipitation amount (r = 0.979) and inversely proportional on average temperature (r = - 0.982) were revealed. For all periods, the correlation in terms of temperature is negative, in terms of precipitation amount - positive, except for the period «sowing - sprouting» (r = - 0,867). The authors recommend using the Canadian selection variety Profi with a growing season of 66 days for early maturity breeding

Effects of temperature regimes on seed germination and early growth of different soybean cultivars

High temperature is an important global issue that impedes agricultural production, especially of soybean (Glycine max [L.] Merr.) crop. Numerous studies were undertaken to estimate the effect of temperature on soybean seed germination under low temperatures. However, the effects of high-temperatures on seed germination and early seedling establishment of various soybean cultivars need to be explored further. Therefore, the current study was performed in growth chambers to evaluate genetic variations among different soybean cultivars for germination and early growth under varying temperatures. Five temperatures, i.e., 15, 20, 25, 30, and 35 ◦C, and four soybean cultivars (PI408105A, PI567731, PI567690, and PI416937) were used. The results showed that soybean cultivars revealed substantial variations in germination percentage (GP), germination rate index (GRI), germination energy (GE), seed vigor index (SVI), and seedling length under different temperatures mentioned above. The results indicated that higher temperature [35 °C] inhibited seed germination. Conversely, the intermediate temperatures [20, 25, and 30 ◦C] depicted good germination. Lower temperature declined the seed germination to some extent, and the germination percentage of PI408105A, PI567731, PI567690, and PI416937 were observed as 63.33%, 56.67%, 50%, and 40.11%, respectively. For all the soybean cultivars, the mean seed germination rate was maximum at 25 ◦C. However, the germination rate index continued to increase until 30 ◦C . The soybean cultivar PI408105A was the most promising under high temperature, exhibiting higher GP by 86.67%, highest SVI by 50.95%, and GRI by 50% at 30 ◦C. In contrast, PI416937 was among the cultivars sensitive to high temperature and showed a higher germination rate only at 20 ◦C. The seeds of PI408105A, PI567731, and PI567690 can germinate well under intermediate temperature conditions, making them a promising species for use in hot climatic zones. According to the current findings, it was concluded that soybean should be planted under mild temperatures for good crop stand and production. Moreover, it is recommended that cultivars such as PI408105A could be grown in warm conditions.

Establishing patterns in the effect of temperature regime when manufacturing nanocomposites on their heat-conducting properties

This paper reports the experimental study carried out to establish the dependence of the thermal conductivity of polypropylene-based nanocomposites filled with carbon nanotubes on the main parameter of the temperature regime of their manufacturing ‒ the level of overheating a polymer melt relative to its melting point. The study has been conducted for nanocomposites that were manufactured by applying a method based on the mixing of components in the polymer melt applying a special disk extruder. During the composite manufacturing process, the level of melt overheating varied from 10 to 75 K, with the mass share of filler ranging from 0.3 to 10.0 %. It is shown that increasing the overheating of a polymer melt causes an increase in the thermal conductivity of the composites. However, when the overheating has reached a certain value, its further growth does not increase the thermal conductivity of nanocomposites. Based on the established pattern, the rational level of this overheating has been determined. That resolves the tasks of manufacturing highly heat-conducting nanocomposites and implementing appropriate energy-saving technology. Data have been acquired on the effects of the impact of the amount of polymer melt overheating on the values of the first and second percolation thresholds for the examined nanocomposites. It is established that the value of the first percolation threshold is more sensitive to the specified amount of overheating. The dependences of the density of the examined composites on the level of polymer melt overheating have been derived. The correlation between a given dependence and the nature of a corresponding change in the thermal conductivity of the composites has been established. Applying the proposed highly heat-conducting nanocomposites is promising for micro and nanoelectronics, energy, etc.

The effect of temperature regimes on laboratory germination rates and germination energy of <i>Astragalus</i> L.

Background. The temperature regime has a significant effect on the enzymatic activity of seeds. Optimum temperatures trigger physical and chemical reactions in the seed and initiate its germination. The optimum temperature depends on the environmental and geographical conditions in the area of a taxon’s origin and is determined experimentally.Materials and methods. The target material of the study were seeds of three Astragalus L. species (A. cicer L., A. onobrychis L., and A. sulcatus L.) collected from young generative plants introduced in the dry-steppe zone of Kulunda. The effect of temperature conditions (+4…+8°C, +10…+20°C, +20…+32°C) and species-specific attribution of Astragalus plants on laboratory seed germination percentage and energy was studied using the two-factor analysis of variance. The assessment of laboratory seed germination was carried out according to the guidelines by M. M. Ishmuratova and K. G. Tkachenko.Results. The analysis of variance showed a significant effect of the temperature regime (51–54%) and species specificity (23–24%) on the germination percentage rate and germination energy of Astragalus seeds. The seeds of A. onobrychis germinated under a wide range of positive temperatures (from +4…+8°C to +20…+32°C). The temperature range of +10…+20°C was optimal for A. onobrychis and A. sulcatus, with 100% germination. The optimum temperature that determined the maximum laboratory germination of A. cicer seeds was in the range of +20…+32°C. Low positive temperatures (+4…+8°C) were not effective for germination of A. cicer seeds.Conclusion. The optimum temperature conditions for germination of Astragalus seeds were identified: +10…+20°C for A. onobrychis and A. sulcatus, and +20…+32°C for A. cicer.

Temperature sensitivity of CO2 efflux in soils from two alpine elevation levels with distinct bedrock types

Predicted increase in climate warming will affect soil organic carbon (SOC) dynamics in vulnerable cold alpine environments. In contrast to freeze and thaw cycles, less is known about the effects of temperature regimes in the range between 2 and 10 °C on SOC availability to soil microorganisms. For this reason, CO2 efflux, extracellular enzyme activities and microbial communities were measured in an incubation experiment with three temperature treatments: (T1) continuous 10 °C, (T2) cooled down to 2 °C, and (T3) rewarmed from 2 to 10 °C. Two forest soils at low elevation and two grassland soils at high elevation were taken from two sites with distinct bedrock types (limestone at Hochschwab, gneiss and schist at Rauris). The CO2 efflux did not differ significantly between the elevation levels at the two sites. In the continuous warm treatment T1, the relative decline in CO2 efflux was stronger in the two Rauris than in the two Hochschwab soils during the 0–123 days period. In the cooling treatment T2, the cumulative ΣCO2C efflux of the Hochschwab soils was lowered by 32% and that of the Rauris soils by only 19% compared with T1 during the 30–123 days period. In the rewarming treatment T3, the ΣCO2 efflux was on average 33% higher than that of treatment T1 during the 91–123 days period, ranging from +8% to +62%. Phospholipid fatty acid (PLFA) composition and extracellular enzyme activities were not markedly affected by incubation time or temperature treatments. The differences in bedrock properties had stronger effects on the ΣCO2 efflux, enzyme activities as well as total PLFA content and composition than elevation level or vegetation. Other, largely unknown factors control the rewarming effects on the mobilisation of a labile SOC pool.

Effects of temperature regime on growth and daily rhythms of digestive factors in Nile tilapia (Oreochromis niloticus) larvae

Environmental factors such as light and temperature present cyclic variations during the day. High temperatures occur during the light phase, whereas low temperatures take place at night (i.e. a daily thermocycle). Although applying thermocycles to fish larvae improves growth in some species, nothing is known about the impact during the early development of the digestive system. The aim of the present research was to investigate the effect of different temperature regimes, cycling versus constant, on the daily rhythms of digestive factors and growth of Nile tilapia (Oreochromis niloticus) larvae. For this purpose, fertilized eggs (stage 1) were divided into two groups: one under a thermocycle (TC) of 31 °C:25 °C day:night and another group at constant temperature of 28 °C (CTE). Photoperiod was set at 12:12 h light/dark cycle. Larvae length was measured on 4, 8 and 13 days post-fertilization (dpf) and samples were collected every 4 h during a 24-h cycle on these days. The expression levels of pepsinogen, chymotrypsinogen, trypsinogen, lipase, maltase, isomaltase, npy and cck were analyzed by qPCR. The results showed that growth was greater when larvae were reared at TC than at CTE. Moreover, on 13 dpf, most analyzed genes (chymotrypsinogen, lipase, maltase, isomaltase, npy and cck) displayed daily rhythms in the TC group but not in CTE, with most acrophases located around mealtime. These rhythms might explain the higher growth rate observed in the TC larvae due to improved synchronization of feed digestion and utilization. These findings could be useful for improving rearing protocols used in tilapia larviculture and enhancing production performance.

Effects of the winter temperature regime on survival, body mass loss and post-winter starvation resistance in laboratory-reared and field-collected ladybirds

Ongoing climate change results in increasing temperatures throughout the seasons. The effects of climate change on insect performance are less studied during the winter season than during the growing season. Here, we investigated the effects of various winter temperature regimes (warm, normal and cold) on the winter performance of the invasive ladybird Harmonia axyridis (Coleoptera: Coccinellidae). Winter survival, body mass loss and post-winter starvation resistance were measured for a laboratory-reared population as well as three populations collected from the field prior to overwintering. The warm winter regime increased the survival rate and body mass loss and reduced post-winter starvation resistance compared to those of the ladybirds in the cold winter regime. The effects of the temperature regime were qualitatively similar for the laboratory-reared and field-collected beetles; however, there were significant quantitative differences in all measured overwintering parameters between the laboratory-reared and field-collected populations. The winter survival of the laboratory-reared beetles was much lower than that of the field-collected beetles. The laboratory-reared beetles also lost a larger proportion of their body mass and had reduced post-winter starvation resistance. Winter survival was similar between the females and males, but compared to the males, the females lost a smaller proportion of their body mass and had better post-winter starvation resistance. The pre-overwintering body mass positively affected winter survival and post-winter starvation resistance in both the laboratory-reared and field-collected ladybirds. The significant differences between the laboratory-reared and field-collected individuals indicate that quantitative conclusions derived from studies investigating solely laboratory-reared individuals cannot be directly extrapolated to field situations.

Carbon Content In Macroalgae Species Against Temperature Regime

Temperature rise due to climate change have an impact on various ecosystems, including coastal ecosystems. Temperature rise also affects plant metabolism, such as carbon uptake. Macroalgae is the dominant community in the intertidal zone, and potential to absorb carbon. A series of experiments on several dominant macroalgae species from the south coast of West Java have been done to see the effect of temperature regime on carbon content. The treatment of temperatures of 24, 27, 30, and 33 °C was carried out for 72 hours against 6 macroalgae species representing Chlorophycae, Phaeophycea and Rhodophyceae to investigate carbon content. The results showed that the macroalgae of Phaeophyceae division showed higher carbon content in comparison to the macroalgae of the other divisions. The temperature that significantly affects chloropyll was 33 oC against all the species being tested.

Ґрунтова схожість насіння павловнії повстистої Paulownia Tomentosa (Thunb.) Steud. різного географічного походження

Досліджено ґрунтову схожість насіння павловнії повстистої, заготовленого у трьох регіонах України: Одеській, Закарпатській та Львівській областях. Встановлено, що насіння павловнії повстистої характеризується високою ґрунтовою схожістю незалежно від географічного походження материнських дерев в умовах України. Найвища ґрунтова схожість притаманна насінню походженням зі Львова. Оцінено вплив температурних умов на ґрунтову схожість насіння за двох змінних температурних режимів пророщування: +15 °С вночі і +20 °С вдень та +21 °С вночі і +25 °С вдень. Встановлено, що температура пророщування істотно впливає на ґрунтову схожість насіння. За температурного режиму пророщування +21…25 °С показники ґрунтової схожості значно вищі. Досліджено вплив стимуляторів схожості: попереднє намочування насіння у воді та розчинах стимовіту, корневіну, бурштинової кислоти, епіну, радіфарму на ґрунтову схожість насіння павловнії повстистої. Встановлено, що попереднє намочування насіння має найвищу стимуляційну дію на подальше проростання насіння в ґрунті серед досліджених стимуляторів схожості. Попереднє оброблення насіння препаратами стимовіт, корневін, бурштинова кислота, епін, радіфарм загалом дало позитивний ефект, підвищивши ґрунтову схожість насіння. Наведено дані з поширення плантацій представників роду Paulownia у країнах Європи.

Effect of Temperature Regimes on Morphological Development of Selected Canola (Brassica napus) Genotypes

Seven canola genotypes selected from early and mid-maturing groups of canola genotypes presently planted in the Western Cape canola production area were grown in 3 litre plastic bags filled with a mixture of sand and compost at ratio of 1:1 and irrigated with fully balanced nutrient solution at EC=2.0 in two glasshouses at night/day temperature regimes of 10/15˚C and 15/20˚C. Plant heights were measured at 14 days interval from 28 to 84 days after planting (DAP). Plants were sampled for leaf area (LA) and above ground dry mass (DM) at budding, flowering and seed physiological maturity stages. Plant growth rates (PGR) from planting to budding, from budding to flowering and from flowering to physiological maturity growth stages were calculated. Relative growth rates (RGR) and net assimilation rates (NAR) from budding to flowering and from flowering to physiological maturity stages were also calculated. Days after planting, GDD and PTU at budding, flowering and physiological maturity were correlated with leaf area, dry mass, number of pods plant-1 and pod dry mass plant-1 at budding, flowering and physiological maturity stages to determine whether there were relationships between the variables. The study showed that by increasing night/day temperature from 10/15˚C to 15/20˚C plant height, number of leaves plant-1 at budding stage, leaf area at budding , plant growth rate (PGR) from planting to budding stage and relative growth rate (RGR) from budding to flowering stage were increased. However, PGR from budding to physiological maturity, RGR from flowering to physiological maturity, net assimilation rate (NAR) from budding to flowering stage, leaf area at flowering and physiological maturity stages, as well as number of flower stems, number of pods plant-1, above ground total dry mass at flowering and physiological maturity stages were decreased. Pod dry mass at physiological maturity decreased by 22.24% to 40.35% for different genotypes which clearly demonstrated the variations in sensitivity of canola genotypes to increasing night/day temperatures and also indicates that canola crop can be genetically improved for heat tolerance.

The Effect of Temperature Regimes and Tissue Types on The Development of Chrysomya megacephala Larvae (Diptera: callophoridae).

This study investigated the effects of three temperature regimes representing several specific development conditions of this blowfly: (25.7, 28.4and 30.6oC) and tissue types. Furthermore, Chrysomya megacephala colonies were reared on three different food sources (all rabbit carcasses, Liver and muscles) on the development of C.megacephala as important forensic fly, and their possible implications to calculate the postmortem interval (PMI). The results showed that the mean durations period from egg to adult eclosion of C. megacephala when reared on control rabbit at 25.7, 28.4 and 30.6 oC were 303.5, 217 and194.5 hrs, respectively. In addition, the mean duration period from egg to adult eclosion when the larvae reared on liver tissue at 25.7, 28.4and 30.6oC were 275.5, 205.5 and 188.5 hrs, respectively. Moreover, The Larvae of C.megacephala reared on muscle tissues from rabbit carcasses, the mean duration from egg to adult eclosion at 25.7oC 28.4oC, and 30.6oC were 293, 214.5 and 192.5 hrs, respectively. From the previous results, it is obvious that the mean duration in larvae reared on control rabbit carcasses was longer than those fed on muscle which longer than those reared on the liver at all temperature regimes.

English

English

Effect of temperature regimes, seed priming and priming duration on germination and seedling growth on American cotton

Effect of temperature regimes, seed priming and priming duration on germination and seedling growth on American cotton

Thermal acclimation in American alligators: Effects of temperature regime on growth rate, mitochondrial function, and membrane composition

We investigated the ability of juvenile American alligators (Alligator mississippiensis) to acclimate to temperature with respect to growth rate. We hypothesized that alligators would acclimate to cold temperature by increasing the metabolic capacity of skeletal muscles and the heart. Additionally, we hypothesized that lipid membranes in the thigh muscle and liver would respond to low temperature, either to maintain fluidity (via increased unsaturation) or to maintain enzyme reaction rates (via increased docosahexaenoic acid). Alligators were assigned to one of 3 temperature regimes beginning at 9 mo of age: constant warm (30°C), constant cold (20°C), and daily cycling for 12h at each temperature. Growth rate over the following 7 mo was highest in the cycling group, which we suggest occurred via high digestive function or feeding activity during warm periods and energy-saving during cold periods. The warm group also grew faster than the cold group. Heart and liver masses were proportional to body mass, while kidney was proportionately larger in the cold group compared to the warm animals. Whole-animal metabolic rate was higher in the warm and cycling groups compared to the cold group – even when controlling for body mass – when assayed at 30°C, but not at 20°C. Mitochondrial oxidative phosphorylation capacity in permeabilized fibers of thigh muscle and heart did not differ among treatments. Membrane fatty acid composition of the brain was largely unaffected by temperature treatment, but adjustments were made in the phospholipid headgroup composition that are consistent with homeoviscous adaptation. Thigh muscle cell membranes had elevated polyunsaturated fatty acids in the cold group relative to the cycling group, but this was not the case for thigh muscle mitochondrial membranes. Liver mitochondria from cold alligators had elevated docosahexaenoic acid, which might be important for maintenance of reaction rates of membrane-bound enzymes.

Effect of temperature regime and compression in OCT imaging of skin in vivo

Abstract: Optical coherence tomography (OCT) is a modern technique for imaging of internal structures of biotissue of up to several millimeters in depth with a resolution of several micrometers. However, various external conditions can distort the diagnostic capabilities of an OCT image. Mechanical compression and temperature regime are the two conditions which mostly affect the diagnostic OCT images obtained with a contact probe. It is shown here that the application of compression to human skin induces a decrease in contrast of the stratum corneum-epidermis junction and an increase in contrast of the epidermis-dermis junction. With regard to these junctions, a preliminary change of biotissue temperature induces additional changes in the contrast, with opposing effects in case of heating and cooling.

Effects of temperature regime and food supply on asexual reproduction in Cyanea nozakii and Nemopilema nomurai

Cyanea nozakii and Nemopilema nomurai are two major giant jellyfish species frequently blooming in East Asian waters in recent decades. In order to inspect their asexual reproduction performance in climate regimes associated with global warming, variations of podocyst reproduction and strobilation were investigated at five different temperature regimes (approximate simulation of summer in warm years and cold years: temperature increased from 18 to 25A degrees C and then decreased to 18 and 10A degrees C in three months, respectively; approximate simulation of autumn in warm years and cold years: temperature decreased from 18 to 10A degrees C in two and three months, respectively; control: constant 18A degrees C), and three food frequencies (once per 3d, once per 6d, and unfed). Strobilation in C. nozakii occurred at warmer temperature (a parts per thousand yen18A degrees C) but lower temperature (a parts per thousand currency sign18A degrees C) in N. nomurai. More than 90% of ephyrae of C. nozakii and N. nomurai were released in the thermal ranges of 22-25A degrees C and 10-13A degrees C, respectively. Higher percentages of polyps produced podocysts, and increased podocyst production was observed at warmer temperature (> 18A degrees C) and more food supplies in both species. The numbers of ephyrae in C. nozakii and podocysts in N. nomurai were significantly increased by prolonged duration of 18-25A degrees C in summer during warm years. Simultaneously, prolonged duration of 10-18A degrees C significantly increased strobilation percentage, ephyra, and podocyst production in N. nomurai in the autumn. More polyps of N. nomurai strobilating in the autumn proved adverse to outbreaks of medusae in the following summer. The results of this study indicate that the response of asexual reproduction to ocean warming appears species specific. Increased ephyra production in C. nozakii but higher podocyst reproduction in N. nomurai is expected in summer and autumn during warm years.

Variation of Seed Dormancy and Germination Ecology of Cowcockle (Vaccaria hispanica)

Cowcockle, an introduced summer annual weed of the Northern Great Plains, is being considered for domestication because of its high quality starch, cyclopeptides, and saponins. Loss of seed dormancy is one of the key desirable traits for domestication. To determine the potential for domestication of this species, an understanding of the seed dormancy and germination patterns is required. The objectives of this study were to evaluate seed dormancy in cowcockle ecotypes and determine how temperature and light affect seed dormancy. We evaluated 15 populations of cowcockle for primary dormancy by exposing them to five temperatures (5, 7.5, 10, 15, and 20 C) under two temperature regimes (constant and alternating) in both dark and light conditions. Freshly matured seeds of all the populations showed high levels of primary dormancy except ‘Mongolia’. Lower levels of dormancy at medium temperatures (10 and 15 C) and greater dormancy at low and high temperatures suggest conditional dormancy, a state at which seeds germinate over a narrower range of conditions compared to nondormant seeds. The effects of temperature regime, light, and their interaction was significant only at suboptimal (5 and 7.5 C) and supraoptimal (20 C) temperatures. Under these conditions, alternating temperatures were more effective in breaking the conditional dormancy, followed by light. The variation in optimum temperature, light, and their interactions among the cowcockle populations may be due to the plants evolving to adapt to their local environments. From a domestication perspective, the conditional dormancy in cowcockle can be observed as an evolutionary mechanism that prevents untimely germination following maturity and may not be a major obstacle for its domestication.

Effect of temperature and pre-incubation time of fibrolytic enzymes on in vitro degradability of Brachiaria (Brachiaria decumbens)

The ruminant production system in Brazil is based mostly on grazing and relies on native pastures and cultivated grass pastures. Improving forage digestibility is essential to overcome the energy loss and excessive nutrient excretion by livestock. Use of exogenous fibrolytic enzymes on tropical grasses has shown promise in increasing forage utilisation and productive efficiency of ruminants. The present study was taken up to evaluate the effect of temperature and pre-incubation time of cellulose-treated substrate (CTS) and xylanase-treated substrate (XTS) on in vitro degradability of Brachiaria decumbens substrate. Two commercial fibrolytic enzymes, cellulase and xylanase, were applied at the manufacturer’s recommended dose of 7.5 and 0.46 enzymatic units per 500 mg DM, respectively. Effect of temperature regimes of substrate exposure (18°C, 25°C and 32°C) and pre-incubation times with the enzymes (0, 12 and 24 h) were investigated in a complete factorial design. Three adult rumen-cannulated Santa Inês sheep served as inoculum donors. Substrates were incubated in vitro in semi-automatic gas production (GP) system and blanks were included for each inoculum. The GP was calculated, rumen degradability and volatile fatty acids (VFA) were determined. Interaction effect between temperature of substrate exposure and pre-incubation time with the enzyme was significant on degradable neutral detergent fibre (DNDF, g/kg) for both CTS (P = 0.01) and XTS (P = 0.04). Net gas production (GP, mL/g DNDF) of XTS (P = 0.06) differ on temperature versus pre-incubation time, whereas CTS were similar (P = 0.34). Partition factor, total VFA and acetate : propionate ratio were non-significant for both the enzymes. These findings highlight that Brachiaria may respond well to exogenous application of cellulase at all the environmental conditions studied and does not need any pre-incubation period.

Outcome of the First Round of Public Consultation on the draft Guidance Document on the Risk Assessment of Plant Protection Products on Bees (Apis mellifera, Bombus spp. and Solitary Bees)

Outcome of the First Round of Public Consultation on the draft Guidance Document on the Risk Assessment of Plant Protection Products on Bees (Apis mellifera, Bombus spp. and Solitary Bees)

Nonuniformity of steel plate mechanical properties after controlled rolling with accelerated cooling

The effect of temperature regimes for accelerated cooling in the range 820–590°C on low-carbon microalloyed steel plate microstructure and properties is studied. Microstructure formation features are determined with unequal cooling conditions over a workpiece length during manufacture by controlled rolling technology with accelerated cooling. Recommendations are made for improving property uniformity over the length during industrial production.