Influence of regeneration process parameters on geometry and defects of clearance surface of planer knives used in wood planing process

A properly implemented strategy regarding the planer knife regeneration process, may not only restore the original cutting ability of the tool, but even increase its operational quality, including its durability for industrial woodworking processes. This article presents experimental results and discussion in respect of sharpening planer knives with cubic boron nitride grinding wheels. Both the grinding conditions and machining surface quality were analyzed. Application of improper size or loads of abrasive grains may lead to the appearance of grinding burns on a machined surface, or result in a surface with cracks and grooves. The results of the measurements carried out indicate that surfaces with reduced values of roughness and waviness parameters can be obtained, even up to 22% (as in the case of the reduced peak height parameter, Spk) in relation to new knives, prepared at a factory. The value of St and Sds parameters are almost the same as reference knife (deviation up to 3%). Due to machining marks, the total waviness exceeds 33%. Our research also shows that due to the technological quality of the knife surfaces, it is beneficial to use CBN grains with a low depth of cut (ae no more than 0.02 mm), but a moderate or high feed rate (the best choice is about 470 mm/min for vft). Presented results constitute an important know-how for the grinding process with the use of grinders used by operators (like WEINIG Rondamat 980) during the sharpening of planer cutter heads in the wood industry.

Challenges in Predictive Modeling of Single Pass Tangential Flow Filtration for Continuous Biomanufacturing

Opportunities for process intensification and increased productivity have made the field of Continuous Biomanufacturing an area of high interest and active research. Within the purification train of producing biologics, Tangential Flow Filtration (TFF) is typically employed after chromatographic separations, to increase drug substance concentration, making the process more economical and further meeting dosage specifications. In a batch operation, concentration occurs via recirculation of the feed material where desired output concentration is attained through multiple pump-passes over the TFF membrane, while steadily excluding the buffer. Single-Pass Tangential Flow Filtration (SPTFF) enables continuity of this process by achieving similar concentration factors through a single – pass over these membranes while operating at low feed flow rates. Our work elucidates the development of a mechanistic process model to predict SPTFF performance across a relatively wide design space using a first principles approach. The developed model is found to be accurate for a range of high feed flow rates but is inaccurate at flow rates below 25 L/m2/hr. At very low flow rates, small differences in the mass transfer coefficient have been observed to significantly alter the prediction of the retentate concentration. We thus describe the challenges in predictive process modeling of SPTFF in antibody biomanufacturing.

Modelling and optimization of magnesium alloy milling parameters

In the pursuit to lighter, less consuming products, manufacturers, especially in aviation and automotive industries, are turning more and more to using lightweight alloys such as the ones based on magnesium. Higher requirements for increased productivity have led to concepts like high-speed machining (HSM), high feed machining (HFM) or high-efficiency machining. Tighter regulations concerning requiring for more environmentally friendly industrial processes led to limitations in the use of cooling liquids and a search for cooling methods with less impact (dry cutting, cryogenic cooling, near dry machining and others). Better machining processes can only be achieved by modelling and optimization. This paper briefly presents the results obtained by our research team concerning the modelling and optimization attempts on face milling of magnesium alloys using different methods: design of experiments (e.g. factorial design, response surface method), fuzzy logic or neural networks.

The Effect of Mycotoxins in naturally Contaminated Diet on the Pathogenicity of Escherichia coli in Broiler Chickens

Contamination of feedstuffs with mycotoxins is considered a huge issue plaguing the poultry sector of Egypt. Therefore, the current study was conducted to examine the effect of the neglected natural mycotoxin contamination of ration on the clinicopathological picture of Escherichia coli infection in broiler chickens. A total of 240 one-day-old chicks were divided into 5 groups. The first 3 groups (1, 2, and 3) were further equally subdivided into 2 subgroups (A and B). Those in group A were fed on commercial ration treated with antimycotoxin while group B was fed on ration contaminated with mycotoxins. Groups 1, 2, and 3 were inoculated at one-day-old with E. coli O78, O128, and O157, respectively while group 4 was kept as a negative control and fed on a ration treated with antimycotoxin. Finally, group 5 was kept as positive controls and fed on a mycotoxin contaminated ration and inoculated with physiological saline. All groups contained 30 chicks. Results showed that the challenged groups fed on a ration containing mycotoxin had high mortality (23.3%) and also a high feed conversion ratio. Moreover, severe clinical symptoms, postmortem lesions, histopathological pictures, and a high rate of bacterial re-isolation were recorded. The pathological lesions were congestion of the liver, spleen, and kidneys in addition to severe pericarditis, perihepatitis, air sacullitis, ascites, and unabsorbed yolk sac. The histopathological changes included degeneration, necrosis, and liver inflammation with lymphoid depletion in the spleen and enteritis associated with sloughing of the mucosal epithelium. The obtained results were less severe in the challenged groups fed on a ration treated with antimycotoxin indicating combined action of both Escherichia coli and mycotoxins. In conclusion, the obtained results revealed that the mycotoxins even at low concentrations can augment the pathogenisity of Echerichia coli in broiler chickens.

SEED PRODUCTIVITY OF ALFALFA IN NON-CHERNOZEM REGION

The results of selection studies conducted at the Central Experimental Base of the Federal State Budgetary Scientific Institution Federal Williams Research Center of Forage Production and Agroecology in the Non-Chernozem Zone of the Russian Federation are presented. Brief data on promising samples and hybrids of alfalfa created in the department of alfalfa breeding for seed productivity are presented. For a long time, alfalfa breeding was mainly in the direction of obtaining new varieties with high yields of fodder mass and little attention was paid to seed yields, which led to the creation of good varieties for collecting green mass and medium or even poor seed productivity. Therefore, the creation of varieties with high feed and seed productivity is the primary task of alfalfa breeding. For this purpose, the main methods of selection are used — polycross, interspecific and intervariety hybridization and selection. In the obtained populations, a careful selection for early ripeness, pollen fertility, plant flowering friendliness is carried out, the power of hybrids, their foliage and other useful indicators are taken into account. By the nature of flowering and pollination, alfalfa refers to cross-pollinating plants. For agricultural production, it is necessary to have alfalfa varieties not only with high, but also stable seed productivity, which does not depend on the conditions of the growing environment and the presence of pollinators.

Monitoring of productive and biochemical parameters of young Clarias gariepinus during feeding of Skretting and Roycher AQUA feeds in experimental conditions

The article presents the results of monitoring the productive and biochemical indicators of the growth rate of young clary catfish using dry extruded complete feed for fish, which have proven to be best adapted for use at all stages of growing clary catfish, namely: Skretting and Roycher AQUA in experimental conditions. The research was conducted in the educational and experimental laboratories of Bila Tserkva National Agrarian University from 2019 to 2021. For the experiment, we used the young of the African marble clary catfish (Clarias gariepinus), purchased from one of the fish farms in the Odesa region. Clary catfish fry was kept in four rectangular plastic containers for 90 liters of freshwater. The tanks were two-thirds full (60 liters). The water temperature was maintained at 26 °C. For the experiment, 120 fries were used, which were kept in four plastic tanks by the method of analogs of 30 specimens each. Given that the fry differed in weight (for experiment 1 we selected fry with higher weight, and for experiment 2 – with lower weight), they were divided on the principle of analogs into two experimental and two control groups. Based on the results of monitoring in Experiment 1, fish observations, and mathematical calculation, we found that the feed ratio when fed Skretting and Roycher AQUA starter feed is 0.74 and 0.99 %, respectively. Based on the results of monitoring, fish observations, and mathematical calculation, it was found that the feed ratio in experiment 2 when feeding starter feed Skretting and Roycher AQUA is 0.75 and 1.54 %, respectively. The high feed rate for the use of Roycher AQUA can be explained by overuse due to the grinding of the granules. Growing aquaculture facilities in an artificially formed system – production, allows you to get environmentally friendly fish products all year round. This is a very important criterion in modern environmental conditions.

Blood metabolites and fecal starch as indicators of feed efficiency of beef cattle in the feedlot

ABSTRACT The use of blood metabolites (BM), fecal starch (FS), and apparent digestion of starch, (ATTSD) as indicators of feed efficiency (FE) in beef cattle in the feedlot was studied. Fourteen bulls were used, originating in an industrial cross, without a defined racial group, with mean body weight of 284.86kg, individually fed, being evaluated in a 42-day confinement system. After the evaluation, the animals were divided into two groups according to the individual FE: high feed efficiency (HE) and low feed efficiency (LE). There was a difference between the groups in the variables FE, feed conversion (FC), final weight (FW), and daily weight gain (DWG). The FE had a positive correlation with DWG, FC, and FW. There was no difference between the groups for the variables BM, FS, and ATTSD, nor was there any correlation between these variables and FE. Considering the feed cost, the HE animals proved more profitable. BM, FS, and ATTSD did not statistically show potential to be used as indicators of FE, despite the evidence of numerical differences of these variables between the different groups, tendency of correlations with FE, and discriminating function with potential assertiveness.

Quail husbandry and welfare systems at Songhai-Delta farm: Profitability of enterprise

Quails are small sized pheasants having a long history of domestication and utilization. The management and welfare systems of Quail production at Songhai Delta farm were surveyed and reviewed. The young quails were sexed by the feather and vent methods when at 6 weeks old and they begin to lay eggs at about that age. Fertile eggs are managed in hatchery until chicks are hatched. Other set of eggs laid are also collected and sold in the farm shop. The quails were fed three types of ration - starter mash at 1-4 weeks of age, grower mash 4-6 weeks and layer mash as from 6 weeks of age. Quails are susceptible to some common poultry diseases; but good management and welfare practices ensure safety and healthy birds. A ratio of 1male to 3 females is the stocking rate in breeder cages in the farm, to obtain fertile eggs. High feed cost and poor market for farm products were the most significant problems of the enterprise. The cost and return estimate for quail bird production indicate that quail venture is highly profitable. The bird has early sexual maturity resulting in a short generation intervals and high rate of lay. Thus, raising quail offers many advantages when compared to producing other domestic or food animals. Quail venture is excellent and recommended for beginners in poultry business, because the birds begin to lay eggs at young age of about 6weeks; and can be slaughtered for food at 5weeks of age. Many developing countries presently faced with problem of inadequate supply of animal protein should find quail production a viable industry. The study recommends a step up of extension services to enlighten farmers and the populace on the importance of quail meat and eggs and the profitability of quail farming. Les cailles sont de petite taille ayant une longue histoire de domestication et d'utilisation. Les systèmes de gestion et de bien-être de la production de cailles à la ferme du delta de Songhai ont été considéré et examinés. Les jeunes cailles sont sexées par les méthodes de 'feather and vent' lorsqu'elles ont 6 semaines et qu'elles commencent à pondre des œufs vers cet âge. Les œufs fertiles sont gérés dans l'écloserie jusqu'à ce que les poussins soient éclos. D'autres œufs pondus sont également recueillis et vendus dans la boutique de la ferme. Les cailles ont été nourries de trois types de ration - purée de démarrage à l'âge de 1-4 semaines, purée de grower 4-6 semaines et purée de couche à partir de 6 semaines d'âge. Les cailles sont sensibles à certaines maladies courantes de la volaille ; mais de bonnes pratiques de gestion et de bien-être assurent la sécurité et la santé des oiseaux. Un rapport de 1male à 3 femelles est le taux de stockage dans les cages d'élevage dans la ferme, pour obtenir des oeufs fertiles. Le coût élevé des aliments pour animaux et le mauvais marché des produits agricoles ont étéles problèmes les plus importants de l'entreprise. L'estimation du coût et du rendement de la production d'oiseaux caille indique que l'entreprise de cailles est très rentable. L'oiseau a une maturité sexuelle précoce résultant en un intervalle de génération court et un taux élevé de produire des oeufs. Ainsi, l'élevage de cailles offre de nombreux avantages par rapport à la production d'autres animaux domestiques ou alimentaires. L'entreprise de caille est excellente et recommandée pour les débutants dans le secteur de la volaille, parce que les oiseaux commencent à pondre des œufs à un jeune âge d'environ 6 semaines ; et peut être abattu pour la nourriture à l'âge de 5 semaines. De nombreux pays en voie du développement confrontés à un problème d'approvisionnement insuffisant en protéines animales devraient trouver la production de cailles une industrie viable. L'étude recommande une augmentation des services d'extension pour éclairer les agriculteurs et la population sur l'importance de la viande et des œufs de caille et la rentabilité de l'élevage de cailles.