Nested Optimization of Oil-Circulating Hydro-Pneumatic Energy Storage System for Hybrid Mining Trucks

In order to recover and utilize the potential energy of mining trucks efficiently, this paper proposes a nested optimization method of a novel energy storage system. By analyzing the multi-objective optimization problem of the oil-circulating hydro-pneumatic energy storage system, a nested optimization method based on the advanced adaptive Metamodel-based global optimization algorithm is carried out. Research shows that this method only requires a short time to solve the complex nonlinear hybrid optimization problem and achieves better results. The optimized energy storage system has higher system efficiency, energy density, and volume utilization rate, thus obtaining a smaller system volume and weight. Verified by the bench experiment of its powertrain, the hydro-pneumatic hybrid mining truck with the optimized energy storage system significantly reduces its fuel consumption and CO₂ emission. Thus, it lays the foundation for the practical application of hydro-pneumatic hybrid mining trucks.

Influence of biological products on the parameters of the root system of wood cuttings of black currant (Ribes nigrum L.)

Black currant (Ribes nigrum L.) is one of the most widespread berry crops in Russia. The need for planting material of black currant is increasing every year, because the area for laying industrial plantations is increasing. The purpose of our research is to assess the effect of combinations of biological products on the rooting rate of cuttings and on the parameters of the root system of black currant. The objects of research are black currant varieties - Dar Smolyaninova, Sevchanka, Yadrenaya. In the research, there are two combinations of biological products: based on Trichoderma viride + water and the combined use Trichoderma viride and Pseudomonas fluorescens. The experiment was carried out in 2021 in the Moscow region. We found that there is no reliable effect of the products on the increase of the root system volume and the roots length. The coefficients of variation for the studied varieties of the root system volume and along the length are very high, that does not make the planting material leveled according to these indicators. Keywords: BLACK CURRANT, RIBES NIGRUM, CUTTINGS, REPRODUCTION, ROOTING, BIOLOGICAL PRODUCTS, TRICHODERMA VIRIDE, PSEUDOMONAS FLUORESCENS

Assessment of the certain fertilizers effect on the quality of Viburnum vulgaris "Taiga rubies" seedlings

In this work research are considered, the results of the effectiveness of fertilizers’ the use of fertilizers on the growth processes of seedlings of the common viburnum 'Taiga Ruby' are considered. The influence of fertilizers on the viburnum root system volume of the root system of the viburnum has been reliably proven (82%). The most effective fertilizer was Osmocote Exact Standard (80.72 ml). Fertilizer Complex fruit and berry Complex (30.88 ml) turned out to be less effective (30.88 ml). The effect of fertilization on the average length of branches (72%) was estimated. The most effective fertilizer was Osmocote Exact Standard (18.8 ml). Fertilizer OMU fruit t and berry (9.4 ml) turned out to be less effective. Keywords: VIBURNUM, GROWING, SEEDING MATERIAL, FERTILIZERS, TAIGA RUBIES

Volumetrics of Hydrogen Storage by Physical Adsorption

Physical adsorption remains a promising method for achieving fast, reversible hydrogen storage at both ambient and cryogenic conditions. Research in this area has recently shifted to focus primarily on the volumetric (H2 stored/delivered per volume) gains achieved within an adsorptive storage system over that of pure H2 compression; however, the methodology for estimating a volumetric stored or delivered amount requires several assumptions related to the ultimate packing of the adsorbent material into an actual storage system volume. In this work, we critically review the different assumptions commonly employed, and thereby categorize and compare the volumetric storage and delivery across numerous different porous materials including benchmark metal-organic frameworks, porous carbons, and zeolites. In several cases, there is a significant gain in both storage and delivery by the addition of an adsorbent to the high-pressure H2 storage system over that of pure compression, even at room temperature. Lightweight, low-density materials remain the optimal adsorbents at low temperature, while higher density, open metal-containing frameworks are necessary for high-density room temperature storage and delivery.

Boundary conditions investigation to improve computer simulation of cerebrospinal fluid dynamics in hydrocephalus patients

Three-D head geometrical models of eight healthy subjects and 11 hydrocephalus patients were built using their CINE phase-contrast MRI data and used for computer simulations under three different inlet/outlet boundary conditions (BCs). The maximum cerebrospinal fluid (CSF) pressure and the ventricular system volume were more effective and accurate than the other parameters in evaluating the patients’ conditions. In constant CSF pressure, the computational patient models were 18.5% more sensitive to CSF volume changes in the ventricular system under BC “C”. Pulsatile CSF flow rate diagrams were used for inlet and outlet BCs of BC “C”. BC “C” was suggested to evaluate the intracranial compliance of the hydrocephalus patients. The results suggested using the computational fluid dynamic (CFD) method and the fully coupled fluid-structure interaction (FSI) method for the CSF dynamic analysis in patients with external and internal hydrocephalus, respectively.

Studying the Stability of the K/Ar Isotopic System of Phlogopites in Conditions of High T, P: 40Ar/39Ar Dating, Laboratory Experiment, Numerical Simulation

Typically, 40Ar/39Ar dating of phlogopites from deep-seated xenoliths of kimberlite pipes produces estimates that suggest much older ages than those when these pipes were intruded. High-pressure (3 GPa) laboratory experiments enabled the authors to explore the behaviour of argon in the phlogopite structure under the conditions that correspond to the mantle, at the temperatures (from 700 to 1000 °С), far exceeding closure temperature of the K/Ar isotopic system. “Volume diffusion” remains foremost for describing the mobility of argon in phlogopite at high pressures. The mantle material age can be estimated through the dating of the phlogopites from deep-seated xenoliths of kimberlites, employing the 40Ar/39Ar method, subject to correction for a partial loss of radiogenic 40Ar when xenolith moves upwards to the Earth’s surface. The obtained data served as the basis for proposing the behaviour model of the K/Ar isotopic system of minerals in conditions of great depths (lower crust, mantle), and when transporting xenoliths in the kimberlite melt.

A novel shift in the glass transition temperature of polymer nanocomposites: A molecular dynamics simulation study

The effect of nanoparticles on the glass transition temperature, Tg, of polymer nanocomposites is studied by using molecular dynamics simulations. Tg is estimated from the variation of system volume with...

Agronomic characteristics and radicular diagnosis of tropical poaceae cultivars by image processing

This study aimed to analyze and compare the agronomiccharacteristics and development of the root system through digital image processing of different cultivars of tropical grasses of Brachiaria and Panicum genera. The experiment was carried out at an experimental station of the Research, Rural extension and land regularization company of Paraiba –EMPAER in Alagoinha -PB, in a rainfed agriculture system. Through June 2019 to 45 days after sowing, the grasses were cut for aerial part evaluation (biomass composition, forage yield, root system (volume and surface area) of the cultivars Mombaça, Tamani, Zuri, Massai, Piatã and Ipyporã. Occurred difference between cultivars for all variables analyzed, except for the leaf-stem ratio. The cv. Mombaça presented the best agronomic and root results, being the one that best adapted the edaphoclimatic conditions of the region. On the other hand, Ipyporã was the least expressive for forage yield and water efficiency. Through root image processing, a diagnosis is possible that reflects the forage yield of the genera Brachiariasp. and Panicumsp.