European Chemical Bulletin

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Improvement of the Forest Tracked Vehicles’ Control by Using Impulse Control Technology for the Steering Mechanism

Improvement of the Forest Tracked Vehicles’ Control by Using Impulse Control Technology for the Steering Mechanism

Author: Roman Dobretsov*, Igor Grigorev, Viktor Ivanov, Artem Zhuk, Nadezhda Verner, Gleb Grigorev, Tamara Storodubtseva, Natalia Dmitrieva
Abstract

This paper proposes an impulse control technology for the steering mechanism to improve forest tracked vehicles' control. The steering control system for the tracked vehicle employs a "diagonal" steering control scheme in combination with the principle of low-frequency (5- 15 Hz) pulse-width modulation of pressure in the hydraulic system. The study offers several modulator and control system designs. The main parameters of the steering control system were selected. Based on the results, an experimental control system was manufactured. The results of the experiment showed that the use of the proposed methodology allows creating conditions suitable for applying the impulse steering technology with minimal changes in the transmission design. Furthermore, the use of low-frequency modulation allowed direct control of disc slipping. This advantage may be useful in designing steering control systems for tracked vehicles. The future study can focus on developing and testing the control system for a modernized skidder chassis

Keywords: tracked vehicles, steering mechanism, closed-loop control systems, pulse-width modulation.

L-PYRROLIDINE-2-CARBOXYLIC ACID SULFATE (LPCAS): A NEW IONIC LIQUID FOR THE SYNTHESIS OF 1,8-DIOXOOCTAHYDROXANTHENES

L-PYRROLIDINE-2-CARBOXYLIC ACID SULFATE (LPCAS): A NEW IONIC LIQUID FOR THE SYNTHESIS OF 1,8-DIOXOOCTAHYDROXANTHENES

Author: Vaibhav W. Godse, Sahebrao S. Rindhe, László Kótai, Yogesh W. Morec , Rajeeta D. Ingle and Rajendra P. Pawar
Abstract

A clean, simple, highly efficient and eco-friendly benign method for the synthesis of 1, 8-dioxooctahydroxanthene derivatives utilizing novel bronsted acidic ionic liquid; L-Pyrrolidine-2-carboxylic acid sulfate (LPCAS) as reagent been reported. Distinguishing features of the methodology are excellent yield of products in shorter reaction time, cleaner reaction profile, environmentally friendly nature and the use of inexpensive reagent.

Keywords: 1,8-dioxooctahydroxanthenes, L-pyrrolidine-2-carboxylic acid sulfate (LPCAS), eco-friendly, solvent free, ionic liqud

GENOTYPIC DISTINCTIONS OF VARIABILITY OF BIOCHEMICAL COMPOSITION OF FRUITS OF VACCINIACEAE SPECIES UNDER CONDITIONS OF BELARUS

GENOTYPIC DISTINCTIONS OF VARIABILITY OF BIOCHEMICAL COMPOSITION OF FRUITS OF VACCINIACEAE SPECIES UNDER CONDITIONS OF BELARUS

Author: Zhanna Rupasova,[a]* Aleksandr Yakovlev,[a] Nikolay Pavlovsky, Vladimir Titok,[ Vladimir Reshetnikov, Tamara Vasilevskaya, Natalia Krinitskaya, Elizaweta Tishkovskaya, and Anton Volotovich
Abstract

Result of research of quantitative characteristics of biochemical composition of fruits of 30 taxons of 3 Vacciniaceae species (such as V. corymbosum L. (highbush blueberry), V. vitis-idaea L. (lingonberry) and Oxycoccus macrocarpus (Ait.) Pers. (cranberry)) inter-specific distinctions of a degree of stability of its separate components to complex influence of meteorological factors are revealed by 32 parameters (traits) describing the contents in fruits of some organic acids, carbohydrates, phenolic compounds, terpenoids and major mineral elements are presented. The cultivars possessing by the greatest and accordingly by the least levels of dependence on abiotic factors are identified.

Keywords: Biochemical composition, genotypic variability, highbush blueberry (V. corymbosum L.), lingonberry (V. vitis-idaea L.), cranberry (Oxycoccus macrocarpus (Ait.) Pers.)

CALCULATION OF ACTIVATION ENERGY OF DIFFUSION AND SELF-DIFFUSION

CALCULATION OF ACTIVATION ENERGY OF DIFFUSION AND SELF-DIFFUSION

Author: G. А. Korablev
Abstract

The methodology is given for the evaluation of activation energy of diffusion and self-diffusion based on the application of spatial-energy
parameter (Р-parameter). The corresponding calculations are made for 57 structures. The calculation results are in accordance with the
experimental data

Keywords: Spatial-energy parameter, structural interactions, diffusion, activation energy

NEODYMIUM(III) SORPTION ONTO SODIUM BENTONITE AND MAGNETIC ACTIVATED CARBON: A COMPARATIVE STUDY

NEODYMIUM(III) SORPTION ONTO SODIUM BENTONITE AND MAGNETIC ACTIVATED CARBON: A COMPARATIVE STUDY

Author: Abdelkader Miraoui ,Mohamed Amine Didi
Abstract

In this paper, the liquid-solid extraction of neodymium(III) by sodium bentonite and magnetic activated carbon was reported. Neodymium (Nd) is a key element that widely applied in high-tech industries; various parameters, such as: the time, metal  concentration, ionic strength, effect of initial pH etc., have been studied to assess the efficiency of sodium bentonite and magnetic activated carbon for the removal of Nd(III). Optimal extraction yield was achieved at pH equal to 9.1 for sodium bentonite and in the range of pHi from 3.1 to 9.2 for the magnetic activated carbon. The time needed for magnetic activated carbon to absorb the maximum of Nd(III) is 100 min and 60 min for sodium bentonite. The experimental capacity obtained was 528 mg g-1 for magnetic activated carbon and 503 mg g-1 for sodium bentonite. In order to validate the performance of this extractants, kinetics and diffusional studies were also developed throughout this study. Adsorption equilibrium data were calculated for Langmuir and Freundlich isotherms. It was found that the sorption of Nd(III) on sodium and magnetic-activated carbon was better suited to the Freundlich adsorption model.

Keywords: : Neodymium, sodium bentonite, magnetic activated carbon removal, kinetics

Nodari Gasviani,[a] Gulnara Kipiani,[a] Shalva Andguladze[b] Marine Khutsishvili[a] and Nino Skhiladze[a]

Nodari Gasviani,[a] Gulnara Kipiani,[a] Shalva Andguladze[b] Marine Khutsishvili[a] and Nino Skhiladze[a]

Author: Nodari Gasviani,Gulnara Kipiani,Shalva Andguladze,Marine Khutsishvili and Nino Skhiladze
Abstract

The electroreduction of manganese(II) chloride from chloride (NaCl-KCl) and fluoride-chloride (KCl-KF) melts has been studied in air
atmosphere by polarography. In both melts, metallic manganese was obtained and the mechanism of the reduction of manganese(II)–ions was elucidated. Optimal parameters of the process could also be established.

Keywords: electroreduction; manganese chloride; molten salts; voltammetry

CAROB (CERATONIA SILIQUA): SUPER FOOD AND MEDICINE. LITERATURE UPDATE

CAROB (CERATONIA SILIQUA): SUPER FOOD AND MEDICINE. LITERATURE UPDATE

Author: Abdullatif Azab
Abstract

Carob (Ceratonia siliqua) is one of the important nutritional and medicinal trees of the Middle East and Mediterranean basin, and in recent decades, it has been grown and cultivated in many other regions in the world. Realization and awareness to its unique nutritional and medicinal properties and biological activities are rising rapidly. A great effort of research has been invested and published since our comprehensive review article was published here, in this journal, in 2017. Most recent publications focus on nutrition and efforts to utilize Carob products for numerous food purposes, but medicinal activities of this tree are still drawing major attention, due to their high potential. In this review article, we are presenting a literature update of published research since late 2017. The main objective of this review is to highlight the nutritional applications of Carob products, which many industrial companies in the world, are trying now to convert to commercial food products.

Keywords: Carob; antioxidant; cultivation; cocoa substitute; male fertility; gluten-free; molasses, nutrition.

A STUDY ON MICROVESSELS OF HUMAN BREAST CANCER TISSUES EMBEDDED IN EPOXY RESINS

A STUDY ON MICROVESSELS OF HUMAN BREAST CANCER TISSUES EMBEDDED IN EPOXY RESINS

Author: Kukurtchyan, N. S.and Karapetyan, G. R
Abstract

Tumor vasculature is irregularly sized and arranged in a disorganized manner, where they share characteristics of arterioles, capillaries, and venules simultaneously. Studies on microvessels of tissues (from mastopathy to human breast cancer) embedded in Epoxy resins using a light optical microscopy method was performed and human breast cancer microvessel images getting on semithin epoxy slices gave a new opportunity in the studying of this disease

Keywords: Microvessels; human breast cancer; light optical microscopy; epoxy resins.