Jolanta Janutėnienė

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• Prof. Dr.
• Professor (Full) at Klaipėda University

Existing studies and methodologies do not offer designers clear guidelines for selecting optimal catamaran geometric parameters. Most focus on separate geometric characteristics or hull elements to minimize total resistance, providing only general trends that are not applicable when designing hull forms that differ from those in the mentioned studi...

Conductive hydrogel has garnered significant fascination for its potential as wearable sensor. However, designing a wearable sensor with excellent electrical conductivity, self-healing capability, mechanical strength and recy-clability is still difficult to accomplish. Herein, a multifunctional composite hydrogel was fabricated via a one-pot method...

The conversion of bio-waste into green nanocomposites offers an innovative and sustainable solution to global waste management challenges while advancing material science. Bio-waste, often seen as a disposal burden, can be transformed into high-performance, eco-friendly nanocomposites that significantly enhance environmental sustainability and reso...

This study presents a sustainable approach to develop antimicrobial films (AMFs) using agricultural wastes. Microcrystalline cellulose (MCC) was extracted from a novel source of Dalbergia reniformis seeds (DRS) through chemical hydrolysis, and bioactive powder from Mikania micrantha (MM) leaves was reinforced into a polyvinyl alcohol (PVA) matrix t...

The use of polymer materials in various fields has increased significantly due to their ease of thermoforming and relatively low production costs. The production volume of these materials is extremely high, and according to forecasts from global statistical centers, it is expected to continue rising in the future. However, the extensive use and eas...

In 2018, the European Commission adopted the European Strategy for Plastics in a Circular Economy, which outlines key actions to reduce the negative impact of plastic pollution. The strategy aims to expand plastic recycling capacity and increase the proportion of recycled materials in plastic products and packaging. Using recycled plastic can save...

The energy efficiency of port container terminal equipment and the reduction of CO2 emissions are among one of the biggest challenges facing every seaport in the world. The article presents the modeling of the container transportation process in a terminal from the quay crane to the stack using battery-powered Automated Guided Vehicle (AGV) to esti...

The operational problem of container unloading from the ship is analyzed in this paper. Dynamic “crane-cargo-ship” system was investigated, and a mathematical model was created. In the model, the gap between the container and the ship’s cargo hold, the mass of the cargo, the container’s center of the mass, and the frictional forces that may occur d...

The use of pyrolysis oil can be seen as an alternative fuel for maritime transport. However, pyrolysis oil from tires must be desulfurized for this. Recently, this can be done by hydrodynamic cavitation. This process does not require oxidation chemicals but only water, a cavitation generator, and a pump to drive it. In the literature, this concept...

Introduction In the paper, we examine the energy consumption efficiency of specialized container diesel trucks engaged in container transportation at a seaport terminal. Objectives Using the container terminal at Klaipėda in Lithuania as the background for the research, we produced an improved energy consumption model for measuring the theoretical...

This study is focused on the efficiency of automated transferring system of packages equipped by variable-frequency drive (VFD) and servo drive motor. It was found that rotation frequency of induction motors and linear speed of servo drive decisively affected the unit efficiency that operates in the periodic mode. The system duty cycle was divided...

This article studies an operational problem arising at a container terminal. Klaipeda city port operations were surveilled up close and relevant remarks were made. The time efficiency of the existing container-lowering procedures using the simulation studies with a test-bed and with a real life crane operation was examined. Statistical analysis of...

Hydrodynamic and thermodynamic processes of geothermal well extraction are investigated and presented in this article. Mathematical models were developed for a deep suction multi-stage centrifugal pump and a piping system. The mathematical models were used to evaluate the gas (nitrogen) release from fluid and its effect on hydrodynamic processes. T...

Full digitization and electrification of the Global transport chain, including transport means and processes, is already happening and will eventually overtake the entire transport chain. A detailed analysis of scientific work is provided in this article. All the main stevedoring process are analysed: container handling from the ship, transportatio...

As the world moves towards CO2 emissions reduction the creation of alternative means of transport primary energy forms. One of the promising energy forms - electric, effectively transferred to mechanical energy by electric motors. Problem analysis of regenerative energy usage for total energy consumption is performed and selected as research object...

The hydrodynamic and thermodynamic processes of geothermal well extraction are investigated and presented in this paper. The paper presents mathematical models for a multi-level centrifugal pump and pipeline system. The mathematical models were used to evaluate gas (nitrogen) emission in water and its effects on hydrodynamic processes. Experimental...

In order to protect the world from the invasive species of organisms the cleaning ballast water is required, in other words, discharged water must meet requirements posted by the International Maritime Organization (IMO). The paper provides a comparative analysis of ballast water treatment equipment and its technical parameters. The research has be...

Today, it is very important to select and install the optimal equipment for the treatment of ballast water in existing ships. Increasing cargo volumes demand for a greater number of ships for transportation and expanded navigation geography as well as result in increased amount of discharged ballast water. Consequently, sea water pollution is incre...

During the experimental studies physical properties of underground water and gases mixture were analyzed and a correlation between pressure and gas content in liquid was determined. Correlation between pressure, temperature and other parameters (density, fluid bulk modulus, sound velocity) were determined with respect to the results of the experime...

The mathematical model of the geothermal system “depth centrifugal pump-pipe (pipe system)” was made to assess the characteristics of an extraction depth centrifugal pump and their correlation with impeller frequency, discharge and other system parameters. Based on this mathematical model the instability zones of the system were determined. The res...

Energy costs of the oil transportation by pipelines process is one of most important questions for the oil companies. Large amounts of energy are used in the oil pumping process. One of the ways to reduce energy costs is to use additives, which would change the rheological characteristics of oil. Anti-turbulent polymer additives reduces the hydraul...

Energy saving is very important to modern efficient and ecological industrial production. One of the simplest and most common upgrade of industrial process system efficiency is to improve pneumatic system performance by installing APC controllers. In this paper we describe how added APC controller to pneumatic system reduces pressure deviation and...

Significant improvements in performance and reliability made in the LED technology have enabled them to be used instead of traditional lighting solutions. This article deals with the advantages and disadvantages of LED, based on the experimental researches carried out in Klaipeda city, and presents some results of comparison of luminance in relatio...

One of the negative activity consequences of cargo transportation by ships is its ballast water pollution with invasive organisms. Ballast water discharge from ships must satisfy IMO requirements. In this paper the comparison analysis of ballast water treatment equipment technical parameters were presented. The advantages and disadvantages of water...

Recycling and usage of secondary raw materials in production is one of the most topical issues. Usage of secondary raw materials is one of the most topical issues in both economic and ecological (environmental) sense. Such a layered film on the market has lower price because secondary raw material prices is significant lower compared with the origi...

We study the development of corrosion defects in an industrial oil pipeline. Defects appearing in the pipeline after 5 and 10 yr of operation are measured by the ultrasonic method. It is shown that, after 10 yr of operation, the pipe wall becomes thinner by 22% (as compared with its initial thickness). To evaluate the defectiveness of state of the...

The paper looks at the impact of the internal welding defects on the strength of joints. The tension tests provided the values of the welded joint strength limits depending on the area of sporadic voids, slag intrusions and the field of discontinuities. Considering the results of the conducted experiments, the mathematical relationships between the...

The paper deals with analysis of dynamic stability and behavior of automatic dynamic balance (ADB) by applying theoretical approach. Differential equations of the considered system were established using Lagrange equation. Numerical analysis of the dynamic equations was performed and influence of dynamic viscosity coefficient on self-balancing proc...

Growth kinetics, i.e. the relationship between specific growth rate and the concentration of a substrate, is one of the basic tools in the modelling of activated sludge community growth. The above‐described conventional growth kinetics derived from single‐substrate‐controlled laboratory experiments have invariably been used for describing both grow...

A long-term operating influence on mechanical properties variation of constructional materials is analysed in this article. During the exploitation of structures and pipelines the consistent surrounding influence causes corrosion of the structures materials. Beside the surrounding influence of the constant stress state affects structures too. For c...

The 3D vehicle with the hydraulic braking system and disc brake with the wheel has been investigated. The dynamic models of the disk brake assembly and the wheel have been constructed. The automobile hydraulic braking system consisting of two contours is considered. . The mathematical model of the hydraulic braking system is presented, where the fl...

A simple way to increase the extinguishing water surface area is to atomize water into fine drops. The smaller drops are developed, the better use of water properties can be implemented and less water is consumed in fire fighting. The automatic impulse extinguishing is created. The main aim of the investigation is to develop the approach to investi...

can be used for the welding of the metals with different melting-points. The technology of ultrasonic welding is superior by quality of welding and price. Ultrasonic weld- ing is used in the production of the vehicle wire also. The requirement for quality and reliability of the vehicle is still growing. One of the main characteristic of the reliabi...

There is analysed the problem of the stability of the reactor using a nonlinear mathematical model. By the method of D-decomposition there is done linear analysis and obtained a region of asymptotic stability D0 and the region D2 in which there appear a stable periodical solution. The nonlinear analysis of the model was done with the help of the th...

Differential equations of self‐excited oscillations, arising in metal cutting process and metal drilling process, are presented in this paper. The causes of these oscillations are delaying forces, arising in metal treatment processes. The linear analysis of differential equations of metal cutting process is performed and an area of asymptotically s...

Differential equations of self‐excited oscillations, arising in metal cutting process and metal drilling process, are presented in this paper. The causes of these oscillations are delaying forces, arising in metal treatment processes. The linear analysis of differential equations of metal cutting process is performed and an area of asymptotically s...

In the practice of metal treatment by cutting it is frequently necessary to deal with self-excited oscillations of the cutting tool, treated detail and units of the machine tool. In this paper are presented differential equations with the delay of self-excited oscillations. The linear analysis is performed by the method of D-expansion. There is cho...

In the practice of processing of metals by cutting it is necessary to overcome the vibration of the cutting tool, the processed detail and units of the machine tool. These vibrations in many cases are an obstacle to increase the productivity and quality of treatment of details on metal-cutting machine tools. Vibration at cutting of metals is a very...

Linear analysis of equations describing treatment process of metals by cutting iš presented. The analysis is based method on D-expansion method. There is choose a areas of asymptotically stability as well as areas describing harmful autooscillations arising during the treatment of metals by cutting is discussed.

In this paper vibration of a high power air blower machine which rotating on journal bearings was estimated, modelled and simulated and experimentally tested in situ. The influence of dynamic stiff- ness of bearing support and gyroscopic effect of air blower rotor vibrations are analyzed. Theoretical modelling of rotor dynamics and experimental inv...