Influence of fertilizers on the productivity of tea plants in the conditions of the north-west Caucasus

The research is aimed at finding effective ways to regulate the functional state of tea plants under stress, increase in yield and its stability, preserving and improving the quality. Foliar spraying of the tea stimulated the active formation of Proline (135.1-179.2 mg/g, in the control - 122.6 mg/g) and ascorbic acid (177.8-226.5 mg/g, in the control - 131.4 mg/g) in the leaves, which indicates the inclusion of processes associated with the mechanism of nonspecific protection against stress. The optimal state of tea plants treated with fertilizers explains the more developed specific surface density of the leaf (1.44 mg/cm2, in the control -1.24 mg/cm). The developed specific surface density of the leaf was ensuring the active operation of the leaf apparatus on the experimental variants, which is expressed in a higher productivity of the leaves (1.27-1.31 g/dm2), compared to the control plants. The highest yield (about 23.05 centner per ha) was observed in the variant with foliar treatments with rokogumin, in the variant with sodium humate (31.47 centner per ha), the yield exceeded the control (26.88 centner per ha) only in 2020, which may be due to the accumulative effect.

Dependence of deformation indices on initial yield strength and hardening intensity of wire material in the passage of drawing route

The model of hardening is considered, which provides for dependence of the current yield strength σт on the product of the initial yield strength σт0 and drawing coeffi cient μ to the degree of hardening coeffi cient k (σт = σт0μk). Difference of axial stress increase from action of anti-tension in absence and action of hardening depending on hardening coeffi cient is determined. Dependencies of drawing stress, safety factor I.L. Perlin and stress state index V.L. Kolmogorov on hardening coeffi cient at different values of initial yield strength are built. Limit hardening factor k is defi ned, at which safety factor is equal to 1. Dependencies of deformation indices on initial yield strength of σт0 at different deformation parameters are constructed.

VITAMIN D DEFICIENCY PREDICTION

Vitamin D Deficiency (VDD) is one of the most significant global health problem and there is a strong demand for the prediction of its severity. The independent parameters like age, sex, weight, height, body mass index (BMI), waist circumference,body fat,bone mass,exercise,sunlight exposure,and milk consumption were used for prediction of VDD. Factors such as lack of sunlight exposure,low physical activity,poor dietary habits,lack of sleep and stress increase the risk of the impacts due to Vitamin D Deficiency.There are certain bad habits that increase the risk of VDD .This project aims at predicting the occurrence of VDD using Gaussian Naive Bayes classifier and Random Forest Prediction classifier.

Determination of the Stress Increase of the Unbonded Tendon in a Continuous Concrete Beam at Ultimate Capacity Using Nonlinear Analysis

Predicting the stress increase of an unbonded tendon in a post-tensioned continuous concrete beam at ultimate capacity is more difficult than when bonded tendons are used. The failure mechanisms of the continuous beam are also different to that of the simple-span beam. The loading type, ductility of the support area and moment redistribution influence the behaviour of the continuous structures. In this research, the simplified nonlinear analysis was used for predicting the unbonded tendon stress increase at ultimate capacity in continuous two-span beams. The model is based on the moment-curvature relationships of the reinforced concrete cross-sections under different compressive forces and deformations of the continuous beam under loading. The results have been compared with the experimental results of recent studies found in the literature. In addition, 92 unbonded post-tensioned two-span beams with different reinforcements have been examined by using the model and compared to the results obtained from empirical equations from the literature. The results from the nonlinear analysis correspond well to the results from the other models up to the reinforcement ratio of 0.35. The calculated values of the maximum moment capacity at the centre support were close to the results from the test beams.

Brain Injury Caused by Rifle Bullet Impacting Bulletproof Plate: Experiment and Simulation

Background: In wars, when bullets impact the bullet-proof helmet, kinetic energy will be transferred from the skull to brain tissue, resulting in the rapid deformation, stretching, shearing and final destruction of the soft tissue. In recent years, with the continuous upgrading of protective equipment, the penetration ability of bullets into protective equipment has gradually decreased, but the problem of head injuries caused by deformation of the back of the helmet has become increasingly prominent. It is of great significance and value to study the brain trauma caused by the bullet impact of the bullet-proof helmet.Methods: First proceeded the rifle bullet impact physical brain model experiment and the results were used to verify the simulation process of high-speed bullet impact, simulated the bullet hitting brain model from different directions (front, side, rear) and different incident angles (0°, 15°, 30°), then evaluated the craniocerebral injury by analyzing skull stress, intracranial pressure, principal strain, and shear strain.Results: When impact from the rear, the peak intracranial pressure and skull stress increase by 20%-25% compared to the front impact, and the principal strain and shear strain are 1.5-2.2 times than that of the front impact. In the same impact direction, the severity of brain injury will increase with the increase of incident angle. When the incident angle increases from 0° to 15°, the intracranial pressure and skull stress both increase, the principal strain and shear stress increase sharply with 6-7 times.Conclusions: Under different shock conditions, the dynamic response of the brain is sensitive, and the impact position and angle of the bullet have important influences on the brain. It is more likely to be caused injury during rear impact, and as the incident angle increases, the severity of the injury will become more serious.

The moderate size 2019 September Mw 5.8 Silivri earthquake unveils the complexity of the Main Marmara Fault shear zone

SUMMARY The unbroken section of the North Anatolian Fault beneath the Sea of Marmara is a major source of seismic hazard for the city of İstanbul. The northern and currently the most active branch, the Main Marmara Fault (MMF), is segmented within a shear zone and exhibits both partially creeping and locked behaviour along its 150 km length. In 2019 September, a seismic activity initiated near MMF, off-coast the town of Silivri, generating 14 earthquakes ≥ Mw 3.5 in a week. The Mw 5.8 Silivri earthquake, is the largest in the Marmara Sea since the 1963 Mw 6.3 Çınarcık earthquake. Our analyses reveal that the activity started in a narrow zone (∼100 m) and spread to ∼7 km following an Mw 4.7 foreshock within ∼2 d. The distribution of relocated aftershocks and the focal mechanisms computed from regional waveforms reveal that the Mw 5.8 earthquake did not occur on the MMF, but it ruptured ∼60° north-dipping oblique strike-slip fault with significant thrust component located on the north of the MMF. Finite-fault slip model of the main shock shows 8 km long rupture with directivity toward east, where the ruptured fault merges to the MMF. The narrow depth range of the slip distribution (10–13 km) and the aftershock zone imply that the causative fault is below the deep sedimentary cover of the Marmara Basin. The distribution of aftershocks of the Mw 5.8 event is consistent with Coulomb stress increase. The stress changes along MMF include zones of both stress decrease due to clamping and right-lateral slip, and stress increase due to loading.