Production Techniques of Metallic Foams in Lightweight Materials

Lightweight materials were needed in many different areas, especially in order to reduce the required energy in areas such as automotive and aerospace industries. Metallic foams attract attention in lightweight material applications due to their unique properties. The pores in its structure provide advantages in many applications, both structural and functional by promising both ultra-lightweight construction, energy absorption, and damping insulation. Production techniques of metallic foams can generally be classified as liquid, solid, gas, and ionic state production according to the physical state of the metal at the beginning of the process. The production technique should be chosen according to the usage area and desired properties of the metallic foam and the suitability in terms of cost and sustainability of production. For this reason, the details of the production techniques should be known and the products that can be obtained and their properties should be understood. In this respect, this chapter emphasizes the production methods from past to present.

Evaluation of solid-state production of myco-coagulant using various lignocellulosic media to reduce water turbidity

High turbidity and suspended solids (SS) are among the significant issues that affect rivers due to the wastewater discharge, terrain condition, land cover, rainfall, agriculture, and other development activities. Chemical flocculants such as polyacrylamide and aluminum sulfate are widely employed for agro-industrial wastewater treatment. However, excessive use of chemical coagulants is harmful to human beings and the environment. Therefore, efficient and economically viable bio-coagulants from renewable biological sources is highly sought after. Myco-coagulant (My-coag) is an organic coagulant produced by fungi that are biodegradable and environmentally friendly. This research aimed to evaluate My-coag solid-state production from locally isolated fungal strains using various lignocellulosic media. The fungus was grown on different lignocellulosic substrates such as cocopeat, sawdust, rice bran, and palm kernel cake for 7 days with a pH of 7.0 at 30 °C. My-coag was extracted from the fungal culture using an aqueous buffer solution of pH 7. The fungal growth rate and dry mass were the highest on cocopeat supplement which was about 1.4 g of dry weight. My-coag extracted from the cocopeat showed good flocculating properties in kaolin suspension with the removal of 96.7% turbidity compared to other substrates such as sawdust, palm kernel cake, and rice bran with the removal of 53.7, 19.6, and 11%, respectively. It is expected that further optimization of this process parameters will lead to the efficient removal of turbidity and solids from water and wastewater to move forward in green technology for sustainable growth in the “Clean Water and Sanitation Sector” and protection of the environment too.

A Novel Scientific Approach to Compare the Effectiveness of Well Stimulation and Artificial Lifting

Production rate decline is one of the most common challenges in production engineering. Obviously, the first step to overcome this challenge is to understand its main reason. In this article a new approach is developed which can be used to compare the effectiveness of artificial lifting and well stimulation. The method is based on a couple of charts which summarize the results of integrated simulation of formation and well-column. In the first graph, called FPI curve, production rate is drawn as a function of productivity index. Some important points are also specified on this diagram which are current state, production rate at maximum possible productivity index and production rate when the well is equipped with a pump or gas lifting. In the second graph derivative of production rate of different wells are drawn as a function of productivity index. The analysis of three actual wells with conventional IPR-TPR curves and also our suggested curves is discussed in this paper. It is seen that the introduced approach can be used as a powerful tool to predict the effectiveness of well stimulation and artificial lifting and make a clear comparison between them.

Large-scale mRNA translation and the intricate effects of competition for the finite pool of ribosomes

We present a new theoretical framework for large-scale mRNA translation using a network of models called the ribosome flow model with Langmuir kinetics (RFMLK), interconnected via a pool of free ribosomes. The input to each RFMLK depends on the pool density, and it affects the initiation rate and the internal ribosome entry rates at each site along each RFMLK. Ribosomes that detach from an RFMLK due to termination or premature drop-off are fed back into the pool. We prove that the network always converges to a steady-state, and study its sensitivity to variations in the parameters. For example, we show that if the drop-off rate at some site in some RFMLK is increased then the pool density increases and consequently the steady-state production rate in all the other RFMLKs increases. Surprisingly, we also show that modifying a parameter of a certain RFMLK can lead to arbitrary effects on the densities along the modified RFMLK, depending on the parameters in the entire network. We conclude that the competition for shared resources generates an indirect and intricate web of mutual effects between the mRNA molecules, that must be accounted for in any analysis of translation.

About the influence of solutions of fulvic acids from sapropel on lettuce plants in various types of its processing

The purpose of our research was to assess the influence of treatment with fulvic acid (FA) solutions (obtained from sapropel) on the physiological state, production process, and quality of salad crops under intensive controlled conditions. Research method. Treatment of plants with solutions of FA in various concentrations was carried out under controlled conditions using three different methods: soaking cress seeds (0.03-300mg/l); non-root treatment of vegetative plants (90–150 mg/l), when growing lettuce by a low – volume method with drip fertigation with Knop nutrient solution; adding a nutrient solution to the root medium (0.03-150 mg/l), when growing lettuce under nutrient film technique. Results. The most pronounced stimulating effect on plant growth was obtained after seeds treatment with FA solutions in concentrations of 0.3-150.0 mg/l, during non-root treatment of lettuce in concentrations of 0.3 and 150.0 mg/l, and when FA was introduced into the root medium at a concentration of 90.0 mg/l. It was suggested the lettuce growth under the action of FA was conditioned by enhancing plants metabolism and increased entry of nutrients to the aboveground organs of plants (during non – root processing)- and by nutrient uptake increasingas well as activation of the synthesis of photosynthetic pigments-chlorophylls and carotenoids (when a nutrient solution was add to the root medium. Scientific innovation. Under controlled conditions, a comprehensive assessment of the effect of FA solutions obtained from sapropel on the physiological state, production process, and quality of salad crops was carried out. The concentrations of fulvic acid solutions that had the most pronounced stimulating effect on the growth and development of lettuce plants in various types of treatment were determined. The specificity of the responses of lettuce plants to various types of treatment with FA solutions was revealed.