bluuebunny/crossref_metadata_2025_split huggingface dataset:
Soil stiffness identification using fuzzy logic based on seismic tomography and its relationship with dynamic elastic moduli
Authors: Yufajjiru L , Maryadi M 
Published: October 2021

Abstract
Either P-wave or S-wave tomography has been used to interpret soil stiffness zone to extend subsurface conditions’ visibility. The dynamic elasticity moduli have been calculated to connect both seismic wave velocities to geotechnical rationale. However, the interpretation has to be more integrated and less subjective. Fuzzy logic has been applied for both velocities fusion to generate geotechnical cross-sections to diminish the subjectivity. Nevertheless, this is a new application, and it is not known whether this result has a relation to the dynamic elasticity moduli or not. Therefore, this research uses Fuzzy Logic to identify the soil stiffness zone and its relationship to the dynamic elasticity moduli. Meta-hypotheses are produced by possibility function in the early phase of the fusion. The possibility function is a fuzzy set that describes each seismic wave velocities to a geotechnical rationale in a possibility scale. Meta-hypotheses fused into hypotheses: the possibility of solid-state behavior and plastic-state behavior. It is found that solid-state behavior is analog to Bulk modulus, and the plastic state is analog to the elastic modulus. Both hypotheses’ extreme values are highlighting the target based on the geotechnical rationale from the possibility function.
Petrography and geochemistry preliminary study of Pucangan Serpentinite Geosite Karangsambung – Karangbolong Geopark Central Java, Indonesia
Authors: Isyqi  , Ansori C 
Published: October 2021

Abstract
Geosite is a Geological Heritage object in the Geopark area with specific characteristics and is an integral part of the evolutionary history of forming an area. Serpentinite Pucangan is one of the Geosite located in Karangsambung – Karangbolong geopark. This study aims to find out the characteristics of petrography and geochemistry of Serpentinite Pucangan Geosite. The methods used in this study include literature studies, fieldwork research, petrography analysis, ore microscopy analysis, whole rock analysis consist of major element analysis using fusion inductively coupled plasma (Fus ICP) methods, trace element analysis, and rare earth element analysis using inductively coupled plasma mass spectrometry (ICP-MS) methods. Serpentine minerals with antigorite type dominate the petrography composition of Pucangan serpentinite with a little magnetite mineral. SiO2, MgO, and Fe2O3(t) are the major elements with the largest percentage of 37.93%, 5.78%, and 9.73% that have an agreement with the mineralogical composition of the rock that dominated by ferromagnesian minerals. This Geosite is interpreted to be formed due to the metasomatic process when the subduction process is happening in this area in the Pre-tertiary period.
An integrated approach using microtremor data for field development and reservoir monitoring: an example from Betung Field, Jambi
Authors: Pascarizativa R. , Haris A , Alwi M S A 
Published: October 2021

Abstract
Reservoir monitoring is one of the most important aspects in oil and gas field management, because it provides industries with the required data in hydrocarbon optimization. This is often carried out in Indonesia by the TAC Pertamina-Pusako Betung Muaro Senami Jambi (PBMSJ), an organization responsible for the management and coordination of oil well activities. In 2012, the organization conducted passive seismic data acquisition and series of drilling campaigns, which successfully increased oil production in Betung Block from 43 to 652 bopd. This campaign was successfully carried out through one and two wells in 2013 and 2014, respectively. Furthermore, the pre-2017 interpretation describes the Betung Anticline as a relatively symmetrical and low angle N-S trending field, which defies the South Sumatra Basin Northwest-Southeast regional trend. This anticline, bound by two high angle normal faults, is unable to define the LKO/OWC position, leading to the consideration of a more integral interpretation approach by the PBMSJ team in early 2017. The procedure was conducted through the use of a 2d seismic line bounded with new wells and SRTM imagery, to combine subsurface structural data with the surface fundamental analogue. In 2017, a passive seismic study was repeatedly conducted in the Betung field, with only 30 measuring points. The urgency in identifying the reservoir is essential within the petroleum industry, in order to produce sufficient hydrocarbons. It is also essential in confirming the potential uses of microseismic data in storage decision-making, through a dataset acquired in Betung, based on reservoir management.
Comparative evaluation of the efficiency of enhancing phytoextraction with heavy metals in Phaseolus vulgaris, Pisum sativum, Sinapis alba using a disubstituted potassium salt of oxyethylene diphysphonic acid
Authors: Makarova A S , Chelnokov V , Matasov A , Nikulina E A , Golenko M G , Pishchaeva K V , Romanova R A , Fedoseev A N 
Published: October 2021

Abstract
It is possible to increase the efficiency of phytoextraction by introducing additives that convert less bioavailable compounds of heavy metals into bioavailable fractions in the soil, as well as to increase the rate of transfer of metals into the plant body. The article presents the results of a study of various chemical additives that affect the development and growth of plants when the soil is contaminated with heavy metals (Ni, Cu, Cd). It can be concluded that the disubstituted potassium salt of hydroxyethylidene diphosphonic acid is a growth stimulant for some plant species, and an increase in growth directly depends on an increase in the concentration of the additive introduced. The work was supported by the Russian Foundation for basic research (RFBR) under the project 18-29-25071.
Biological method based on track membranes to form controlled gaseous media for fruit cold storage
Authors: Kostiuk V A , Kolodyaznaya V S , Rumiantceva O N , Kiprushkina E I , Shestopalova I A 
Published: October 2021

Abstract
The article proposes a biological method based on the use of gas-selective track membranes to form a modified gas atmosphere, considering the respiration rate of fruit. The work aims to study the change in the respiration rate of apples depending on the variety and storage time to substantiate the formation of the gas medium composition depending on the respiration rate of the fruit and the area of track membranes, and to study the kinetics of oxidation reactions of biologically active substances during cold storage of apples. The research is based on autumn apple varieties: Grushovka Yudicheva, Kordonovka and Pepin Shafranny. We have obtained the kinetic curves of changes in the content of mono- and disaccharides, ascorbic and organic acids in autumn apple varieties depending on the gas composition in terms of oxygen and carbon dioxide content, as well as the duration of fruit storage using track membranes. For maximum quality preservation, nutritional and biological value of the studied apple varieties at t = (3 ± 1) °C, we have determined a recommended composition of the controlled gas atmosphere: oxygen concentration - (5.2 ± 0.1%), carbon dioxide - (3.6 ± 0.1%). Controlled atmosphere is created using a gas-selective composite membrane with an area of 14-22 cm2/kg, depending on the variety and respiration rate.
Medical Waste as a Source of Antibiotic Contamination in Wastewater
Authors: Timofeeva S S , Bodienkova G M 
Published: October 2021

Abstract
In modern conditions of the coronavirus pandemic, the amount of medical waste is sharply increasing, among which antibiotics that enter the environment from various sources are among the most hazardous from an environmental point of view. The article analyzes the sources of antibiotics coming with hospital wastewater. The majority of medical institutions for the population of our region have no local treatment facilities and antibiotics transit through them. The aim of this paper was to collect and analyze information on medical waste in medical institutions of the Baikal region as a source of antibiotics in water bodies and to assess environmental risks. Based on information on the procurement of antibiotics for medical institutions in the Irkutsk Region, it was established that the sources of pollution of natural waters with antibiotics are wastewater from agricultural enterprises, medical institutions, and home first-aid kits. The total amount of antibiotics circulating in the Irkutsk Region reaches 9.2 tons, the residual concentration of antibiotics in wastewater from various sources ranges from 0.3 to 3.9 mg/L. The hazard quotients for drinking water contaminated with antibiotics are of medium and low categories.
Analysis of heat losses during heat supply of an urban-type settlement using a heat pump
Authors: Nikitin A A , Konicheva O E , Muraveinikov S S , Nezhurin E V , Rachkovsky N O 
Published: October 2021

Abstract
Centralized heat supply systems include a network of pipelines connecting buildings and structures in such a way that entire districts and quarters are supplied with a heat carrier from a single boiler plant. District heating is a well-studied part of the energy system. Despite this, low temperature district heating is still underdeveloped, although it is one of the key technologies for energy efficient urban heating. Low-temperature heat supply systems are the basis of 4th generation district heating systems, since they can significantly reduce heat losses during transportation of the heat carrier to the heat energy consumer and allow the use of heat from renewable sources, for example, heat pumps. The study focuses on analyzing the heat loss of a district heating system by comparing simulation results at a standard flow temperature and at a temperature typical of the 4th generation heat supply schedule. On the basis of the created model, the calculation of heat and hydraulic losses of the low-temperature district heating system was carried out, as well as a comparative analysis in comparison with the standard heat supply system.
Reorganization of industrial territories in the context of urban development
Authors: Taubert E A , Pavlova A S 
Published: October 2021

Abstract
The area of Saint Petersburg is about 144,000 hectares, industrial areas occupy 24% of urban lands. The historical center of the city is surrounded by the so-called “gray belt”, which is a zone of industrial enterprises that are unsuitable for further use for their intended purpose and that have come to an emergency condition. It was formed in the following way: enterprises were moved to the outskirts of the city, and when the development of the residential zone within the “belt” became impossible, urban development continued beyond its borders. This type of industrial development is typical of most large cities over 200 years old. Many foreign cities and towns of Russia, to varying degrees, have faced the problem of reorganizing such territories. St. Petersburg continues to develop and accept new residents, but it needs an urgent transition from extensive growth to building a model of sustainable urbanization and improving the quality of infrastructure.The purpose of this work is to provide research results that consider the effectiveness of methods for reorganizing industrial areas in urban development by the example of one of the buildings of the “gray belt”. The research object is located on the territory of a residential area under construction.The results of the project showed the effectiveness of greening the roof and facade of the building in order to increase its energy efficiency, reduce water consumption and compensate for insufficient gardening at home (this problem is especially relevant for the central districts of the city).
Subcritical processing of raw materials for the production of food additives
Authors: Zh Iskakov I , Ya Kucherenko V , Alekseev G V , Kravtcova E V , Egorova O A 
Published: October 2021

Abstract
The article is devoted to the analysis of pectin diffusion extraction in the extraction process from plant raw materials in a solid-liquid system. The molecular diffusion process from the inside of the extractable substance particles to their outer surface is considered as the limiting stage. The aim of this work is to study the possibility of creating an efficient production of pectin from agricultural products by carrying out a more complete extraction using a period of mass isolation in the extraction process. As it is generally recognized all over the world, the rational use of natural resources is the dominant trend in the development of the economy, which assumes the fullest use of vegetable raw materials consumed by humans in the processing. To implement such approaches, a mathematical model of the discrete diffusion process in porous diffusionally isotropic particles has been developed. A conclusion is made about the effect of mass isolation on the extraction rate for a regular mode, while the regularities of the process remain unchanged.
The control of Industrial emission via the subsoil green filters
Authors: Al-Maliki S J B , Jaafar K , Wahab B I 
Published: October 2021

Abstract
The vast consumption of fossil fuel as an energy source for the various industrial, commercial and municipal activities, has led to the production of huge air pollutants, in a manner that needs more modern and effective efforts and technologies to prevent their hazardous consequences. This project aims to the use of the subsoil of nearby grounds as a natural filter to distribute these pollutants based on the soil`s high porosity and their ability to handle huge amounts of the gaseous effluents of the artificial projects. Soil properties such as the mechanical properties, porosity and ground water content were tested for different depths for two types of soils, in order to assess their readiness for the tentative use as a gaseous filter and to avoid the possible negative effects for the injection of gaseous pollutants on their biologic systems. An experimental system was made using a 5 KVA power generator, the gaseous emissions of which would be distributed through the subsoil via a buried pipe. The project also, included the precautions for the possible machine backpressure that may damage it. The wet clay type of soil has shown remarkable better performance than the dry sand type.
Study on the behavior of benchmark container ships in regular waves
Authors: Chirosca A-M , Rusu L , Pacuraru F 
Published: October 2021

AbstractThe study of the behaviour of ships in the real sea has become a real challenge in recent years due to climate change, especially in the European sea basin. One of the main categories of types of ships that cross these waters are transport ships. The development of the economy and trade have a major influence on this type of ships, which must be studied and improved in order to be fully exploited. Investigating the ship’s behavior is not a new topic, but the changing environment of the transport ship’s specifications requires continuous study. An alternative to model testing is the use of numerical simulation through which performance can be fully evaluated using only computers, without the need to produce a scale model for testing. Due to improved computer performance, but also the disadvantages of towing testing, numerical simulations have become increasingly popular for determining ship characteristics. The shorter time in which results can be obtained, as well as the ease of controlling and changing the input parameters, contributes to the preference to use numerical simulations, to the detriment of basin tests. In this paper, the behavior of a Post-Panamax benchmark container ship in regular waves was studied. Numerical simulations were performed using SHIPFLOW MOTIONS, a solver that treats potential nonlinear flows for regular waves and provides accurate results by the free surface potential flow panel method. For our case, the simulations were performed for a range of six speeds corresponding to Froude numbers ranged between 0.174 and 0.218, for five nondimensional wavelengths (λ/Lpp) and for four wave heights. Because body discretization is one of the main factors for obtaining accurate results, an additional study was conducted in calm waters on body refinement and the influence that the mesh has on results, for a range of ten grids with different densities.
Analysis of robotic welding possibilities of a car chassis assembly
Authors: Coman M N , Rontescu C , Bogatu A M , Cicic D T 
Published: October 2021

Abstract
The continuous increase of the requirements regarding the quality of the welded joints (elimination of the influence of the human factor) but also the increase of the productivity of the technological processes imposed the analysis of the possibilities of implementing robotic welding processes. The introduction of robotic production lines is an increasingly common thing in the automotive industry. This paper presents the stages necessary for the realization in welded construction of a crossbeam, part of the chassis of a car. The elaborated welding technology aimed to achieve the transition from semi-mechanized welding of the assembly to robotic welding using the MAG (Metal Activ Gas) welding process. The basic material from which the crossbar is made is S355 MC steel, steel for constructions with high mechanical properties. For the robotic welding of the assembly, the design of the device necessary for the orientation and fixing of the components was made. The welding technology developed was validated by performing standard samples that were subjected to visual examination and penetrant testing but also to destructive examinations which consisted in measuring the hardness in the characteristic points of the welding bead and also by measuring its geometric characteristics. Following the analysis of the initial dimensional values obtained, it resulted that the incorrect positioning of the welding head in relation to the welded components led to the appearance of geometric defects of the welding seams, although the technological parameters of the welding regime were appropriate. After making adjustments on the position of the welding head, accepted characteristics were obtained which led to the decision to validate the welding technology used.
The nonlinear ship rolling and safe basin erosion in stochastic beam seas
Authors: Deleanu D , Dumitrache C L 
Published: October 2021

Abstract
A short number of steep breaking waves hitting a ship from the side may affect its dynamic behaviour and determine extreme roll angles and, eventually, capsizing. Even the capsize is a rare event, its consequences for the ship and crew are often fatal. Generally, the ship rolling in regular or stochastic beam seas could be described by a second-order non-linear differential equation with the roll angle as dependent variable. Non-linearity comes from the restoring and damping moments, which are usually represented by polynomials of roll angle or of its time derivative. In the paper, we used such a model equation to estimate the ship rolling and capsizing in a stochastic beam sea. The sea action was simulated by a harmonic function with random frequency and phase. The roll equation was solved using a simple, fast and accurate iterative scheme based on Taylor expansion which proved to be very competitive in terms of accuracy with more elaborate methods and which allowed a substantial reduction of the CPU time. Due to these properties of the scheme, we were able to conduct an extensive investigation on fractal erosion of safe basins and to represent the boundaries between capsizing and non-capsizing regions in wave frequency – wave amplitude plane and normalized integrity curves for different combinations of random wave parameters. The restoring and damping coefficients corresponded to a vehicle ferry model, considered to be either with or without bilge keels.
Study on the behaviour and comfort of reusable knitting suits of wool blends in the context of the Covid 19 pandemic
Authors: Dochia M , Kaminszky R , Fogorasi M S , Farima D , Barbu I , Nicolaescu C , Pustianu M , Popa A , Bucevschi A 
Published: October 2021

Abstract
Nowadays, humanity is facing serious challenges due to the disruption of the COVID-19 pandemic, affecting dramatically our healthcare system along with the economic structure, social and cultural life. Healthcare personnel treating patients with infections like COVID-19 are exposed themselves to infection. Therefore, it is compulsory to be protected from contaminated body fluids using personal protective equipment (PPE). This equipment made of synthetic fibers proved to be uncomfortable. Therefore, we developed a reusable suit composed of a blend of wool and silk to be wear under full-body protective clothing aiming to improve their comfort and safety. Firstly, we focused on the analysis of some dimensional characteristics: specific mass, porosity, thickness followed by comfort characteristics of knitted fabrics. Accordingly, the test methods comprise measurements for hydrophilic properties, air and water vapour permeability, thermal conductivity and dimensional stability to repetitive washing. After material analysis, a significant number of two-piece suits composed of blouse and trousers were industrially manufactured and delivered to healthcare personnel to be tested. The results are completed and supported with the perception of the healthcare staff involved in the study via a survey. Finally, the results and implications for future research are presented.
Computational NX Fluid Structure Interaction (FSI) analysis on naval three way ball valve
Authors: Dumitrache C L , Deleanu D 
Published: October 2021

Abstract
This article represents the continuation of a study that was presented in another paper using the NX Siemens CAD program and FSI (fluid structure interaction analysis) for a complex valve encountered in the naval domain, a ball valve known as (three way ball valve -TWB). In designing of this valve presented in the previous work, some drawings (sketches) of the component parts presented in engineering guidelines were used, all dimensions being determined by the author. In the FSI analysis the same NX Siemens program was used to discretize the solid bodies of the valve coming into contact with the fluid, materials were chosen for these bodies, boundary conditions were set and the pressure field exerted by the fluid on the solid bodies was imported. Finally a series of conclusions were drawn about the speeds, pressures of the fluid and how they are distributed on the walls of the valve, determining the so-called structural analysis “fluid structure interaction”.
Dielectric barrier discharge analysis from the point of view of supply voltage and reactor topology
Authors: Lungu C V , Hnatiuc B 
Published: October 2021

Abstract
This paper aims to provide a comprehensive analysis of the output of DBD reactors considering 2 different power supplies that provide rectangular command voltage with variable duty cycle and frequency. The experiments presented were performed with these power supplies considering four geometries of DBD reactor. At this stage the input parameters of the power supplies are: frequency of control pulses, duty cycle and high voltage level applied on the DBD reactors by choosing a certain number of turns for the primary windings of the high voltage coil. The parameters considered as outputs from the reactor-power supply assembly were: the high voltage output and the electric current from the primary induction coil.