bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of lattice Boltzmann method for studying interaction dynamics of parallel plane minijets
Authors: Sangadiev A L , Terekhov V V 
Published: July 2020

Abstract
In this work, the method of lattice Boltzmann equations was applied to simulate the systems of two and three parallel laminar plane jets. Simulation was carried out for different Reynolds numbers (Re = 20-200). For the case of two jets, the character of jet interaction has been determined to be, in general, non-stationary, but for small Re values, the process becomes stable due to the action of viscosity forces. For the case of three jets, the character of jets interaction is found to differ significantly from the case of two jets and is non-stationary even for small Re numbers.
Calculation methods of the gas flow in the impeller of a turbo-expander of ORC plant used in the heating plant
Authors: Solomin I N , Daminov A Z , Kamalov R F 
Published: July 2020

Abstract
The calculation of a turbo-expander impeller of a thermoelectric plant operating according to organic Rankine cycle (ORC) is given. The calculation was carried out for real gas using the Peng-Robinson model. Freon R245fa was chosen as the working fluid of the plant. The approximation values of the coefficients of polynomial describing the temperature dependence of isobaric heat capacity on Freon R245fa were used in the calculation.
Experimental study of the vibration of vertical rod in liquid flow
Authors: Lobanov P D , Meledin V G , Pribaturin N A , Svetonosov A I , Shchepikhin I V 
Published: July 2020

Abstract
Vibration of the vertical tube, induced by an axial flow, were studied experimentally. Experiments were carried out using the sensors based on the electrical impedance. The time chronology of the pass of the tube axis was reconstructed using four sensors. For various flow rates different modes of fluctuations were found. The amplitude, shape, and characteristic frequencies of signals were found to change depending on the liquid flow rate.
Research of the electro-vortex flows in the liquid metals at different currents
Authors: Mikhailov E A , Teplyakov I O , Fedotov I A 
Published: July 2020

Abstract
The electro-vortex flow is a very important phenomenon, taking place in the different processes in metallurgy, such as electrical welding or electrical melting. It appears in the conducting medium under the action of the electromagnetic force due to interaction of the non-uniform electrical current (which passes through this medium) and self-magnetic field. Here we present the study of the electro-vortex flow for the hemispherical geometry. The equations were solved in variables “vorticity – vector potential of velocity”. We considered the problem using Stokes approximation and non-linear case with a finite size of the central electrode, and compared the results obtained by different methods of solving the equations.
Heat transfer features in a PCM-based system under the time-dependent thermal load
Authors: Bondareva N S , Sheremet M A 
Published: July 2020

Abstract
Present study is devoted to a numerical analysis of heat transfer processes inside a complex radiator system based on phase change materials (PCM) under the influence of unsteady heat generation local element and external convective cooling. The numerical solution has been implemented by the finite difference method using the enthalpy-based approach to solve the energy equation. As a result of the solution, temperature distributions and liquid flow structures for different time moments, as well as integral characteristics of the melting process as a function of time, have been obtained. The effect of the external Newtonian cooling on the melting intensity and heat transfer patterns has been analyzed.
Vertical-plate free convection boundary layer disturbed by a row of circular cylinders: RANS-based numerical simulation
Authors: Kotikova M R , Levchenya A M , Zasimova M A , Smirnov E M 
Published: July 2020

Abstract
This paper presents the results of RANS-based numerical simulation of 3D flow dynamics and heat transfer in the turbulent free-convection boundary layer disturbed by a transverse periodic row of finite-height cylindrical obstacles. The disturbing row elements are mounted on a vertical isothermally heated plate along which the free-convection flow develops starting from a 2D state prescribed at the computational domain inlet. The height-to-diameter ratio of the cylindrical obstacles is varied from 1 to 3, and their surface is treated as adiabatic or isothermal. Vortex flow structures and local heat transfer patterns in the front and in the rear of the introduced macroroughness are analyzed.
Numerical study of cuttings transport by drilling polymer solutions
Authors: Zhigarev A , Minakov A V , Guzei D V , Neverov A L , Nabizhanov Z I , Matveev A V 
Published: July 2020

Abstract
This paper presents the results of laboratory tests and numerical simulation of polymer drilling fluids. The influence of the rotation speed on the values of the pressure ratio and cutting transport is studied. The influence of rheological parameters on the efficiency of cuttings transport is investigated.
Optimization of the thermodynamic and thermophysical properties of the gas turbine cycle working fluid
Authors: Filippov P S , Lazebniy I P , Ryzhkov A F 
Published: July 2020

Abstract
A gas turbine cycle working fluids group based on their production technology and application is presented. The energy parameters analysis procedure of unclosed and closed gas turbine cycles is described. The comparison of the effect of the working fluids thermophysical and thermodynamic properties variations on the useful work l0
of both unclosed and closed gas turbine cycles is presented. The effect of the fuel gas composition variation on the useful cycle work l0
is revealed. The effect of the working fluid thermophysical properties variation on the gas turbine cycle optimal combination of thermodynamic properties (T3
and P3
) is presented.
Free piston pulse tube engine: a numerical and experimental power generation estimation
Authors: Dovgyallo A I , Nekrasova S O , Pulkina A Yu , Sarmin D V 
Published: July 2020

Abstract
The results of theoretical and experimental study of the atmospheric pulse tube engine (PTE), which is a kind of thermal inertial Stirling engine, are presented. The main advantage of the PTE is the absence of the moving design elements in heated part make it a perspective technology for waste heat recovery. Firstly, numerical simulation was conducted to design the system and optimum structure parameters of the system were obtained as well as the values of the free-piston PTE resonant frequency, the levels of the input and rejected heat, and the net power. Comparison of the net power and the thermal efficiency of the pulse tube engine with the crank mechanism and the free piston is provided. A comparison of operating conditions and engine start conditions for different free piston masses and temperatures in the hot heat exchanger is performed. The results are compared to prior numerical studies. The maximum value of the net power of the PTE was achieved for the frequency of 11.8 Hz, the input thermal power of 160 W and the temperature of 640 K.
Impact of climate variabilities on trans-oceanic flight times and emissions during strong NAO and ENSO phases
Authors: Kim Jung-Hoon , Kim Daehyun , Lee Dan-Bi , Chun Hye-Yeong , Sharman Robert D , Williams Paul D , Kim Young-Joon 
Published: July 2020

Abstract
This study investigates the impact of the North Atlantic Oscillation (NAO) and El Niño Southern Oscillation (ENSO) on trans-oceanic round-trip flight times and consequent CO2 emissions over the north Atlantic and eastern Pacific regions. For three strongest winter periods of both polarity during 1979–2016, daily mean wind data are used to compute the wind-optimal flight trajectories at cruising altitudes. Results show that intensified upper-level jet streams during the +NAO winters provide stronger headwinds for westbound flights between the eastern US and the western Europe. This causes 4.24 ∼ 9.35 min increase in an averaged total round-trip journey time during the +NAO compared to −NAO winters. In the eastern Pacific region, the jet stream is extended eastward towards the southwestern US during the +ENSO period, which lengthens the travel time for westbound flights between Hawaii and the west coast of the US. The increase in travel time of westbound flights is greater than the corresponding decrease in travel time for eastbound flights, resulting in a 5.92 ∼ 8.73 min increase of the averaged total round-trip time during the +ENSO compared to the −ENSO periods. Extrapolating these results to overall trans-oceanic air traffic suggests that aircraft will take a total of 1908 ∼ 4207 (888 ∼ 1309) extra hours during the +NAO (+ENSO) than the −NAO (–ENSO) winters over the North Atlantic (Eastern Pacific) regions, requiring 6.9 ∼ 15 (3.2 ∼ 4.7) million US gallons of extra fuel burned at a cost of 21 ∼ 45 (9.6 ∼ 14) million US dollars and 66 ∼ 144 (31 ∼ 45) million kg of extra CO2 emissions to all trans-oceanic traffic. In +ENSO and +NAO winters, the chances of a given flight having a slower round-trip flight time with more fuel burn and CO2 emissions are 2–10 times higher than in a −ENSO or −NAO winter. These results have significant implications for the planning of long-term flight routes with climate variability.
Greenhouse gas balance in global pasturelands and rangelands
Authors: Dangal Shree R S , Tian Hanqin , Pan Shufen , Zhang Lei , Xu Rongting 
Published: July 2020

Abstract
Grassland ecosystems play an essential role in climate regulation through carbon (C) storage in plant and soil. But, anthropogenic practices such as livestock grazing, grazing related excreta nitrogen (N) deposition, and manure/fertilizer N application have the potential to reduce the effectiveness of grassland C sink through increased nitrous oxide (N2O) and methane (CH4) emissions. Although the effect of anthropogenic activities on net greenhouse gas (GHG) fluxes in grassland ecosystems have been investigated at local to regional scales, estimates of net GHG balance at the global scale remains uncertain. With the data-model framework integrating empirical estimates of livestock CH4 emissions with process-based modeling estimates of land CO2, N2O and CH4 fluxes, we examined the overall global warming potential (GWP) of grassland ecosystems during 1961–2010. We then quantified the grassland-specific and regional variations to identify hotspots of GHG fluxes. Our results show that, over a 100-year time horizon, grassland ecosystems sequestered a cumulative total of 113.9 Pg CO2-eq in plant and soil, but then released 91.9 Pg CO2-eq to the atmosphere, offsetting 81% of the net CO2 sink. We also found large grassland-specific variations in net GHG fluxes, with pasturelands acting as a small GHG source of 1.52 ± 143 Tg CO2-eq yr−1 (mean ± 1.0 s.d.) and rangelands a strong GHG sink (−442 ± 266 Tg CO2-eq yr−1) during 1961–2010. Regionally, Europe acted as a GHG source of 23 ± 10 Tg CO2-eq yr−1, while other regions (i.e. Africa, Southern Asia) were strong GHG sinks during 2001–2010. Our study highlights the importance of considering regional and grassland-specific differences in GHG fluxes for guiding future management and climate mitigation strategies in global grasslands.
A Novel Maritime Risk Assessment Model of Waterway Transportation Based on Takagi-Sugeno Fuzzy Logic: Vietnam Case Study
Authors: Le V. T. , Dang X.K. , Nguyen D.H. , Pham T.D.A. 
Published: July 2020

Abstract
In this paper, we analyzed the safety assessment getting from the opinions of captains, pilots and navigators in Ganh Rai Bay. The results showed that the highest risk was caused by unsafe fishing ships and the most unsafe situation was generated by the crossing ships, wind and currents. The influence of human psychology factors was one of the most important factors, which caused the risk of collision. Based on fuzzy logic theory, we proposed risk assessment model which was tested in simulation and compared with the evaluation results of the Experts in Vietnam. The results showed the effectiveness of the novel maritime risk assessment model.
Design and Implementation of Realtime Scour Monitoring of Hangzhou Bay Sea-Crossing Bridge Pier Based on Dual-Axis Scanning Sonar
Authors: Peng Lei 
Published: July 2020

Abstract
This paper introduces the design and implementation of the realtime scour monitoring system for piers of Hangzhou Bay Sea-Crossing Bridge, including the construction of the monitoring system for the scour of the piers and the key technologies of the monitoring system. Through integration of dual axis scanning sonar technology and monitoring software, real-time seabed topography observation, data processing, analysis and data release based on the Internet is realized, qualitative, quantitative and locational decision support for management departments is provided.
Study on Synchronous Effects of Free Surface and Propeller Rotation on Vessel Rudder Force
Authors: Ky Quang Pham , Van Duy Vu , Xuan Tung Trinh , Dinh Chien Dang , Anh Vu Co Tan 
Published: July 2020

Abstract
The paper presents a theoretical foundation of the effects of free surface and propeller rotation on the flow surrounding the rudder of a vessel. This is the scientific ground to evaluate the instability of the rudder force, thence building a research model and applying CFD in simulated to calculate the phenomenon. On the other hand, this paper also issues the idea of designing and creating a test system for carrying out practical experiments on related problems by using ship models similar to M/V TAN CANG FOUNDATION. The input data merely including ship’s lines, ship’s speed, rudder angle… are observed in the period of manoeuvering the vessel in the Haiphong fairway, Vietnam. The results are shown in this article distinctly figure out pulsating air bubbles caused by the synchronous effects of the free surface, the propeller rotation and indicate that the oscillating period of the rudder force at the time cavitation at the leading edge of the rudder which has not been formed is compatible with the revolutions of the propeller.
Surface Water Quality Analysis using Fuzzy Logic Approach: A Case of Inter-provincial Irrigation Network in Vietnam
Authors: Hue N H , Thanh N H 
Published: July 2020

Abstract
Water quality assessment plays an essential role in sustainable management and development of river systems. However, this process is highly complicated that requires professional expertise. The fuzzy water quality index (FWQI) based on fuzzy logic is computational method categorizing water quality into various categories for different water uses. In this study, a method based on fuzzy inference systems (FIS) to assess water quality in the Nhue River, an inter-provincial irrigation network in Northern Vietnam, using fuzzy logic is proposed. Nine fuzzy variables namely dissolved oxygen (DO), biological oxygen demand (BOD5), chemical oxygen demand (COD), pH, ammonium (

NH

4
+

), phosphates (

PO

4

3
−

), total suspended solids (TSS), turbidity, and total coliform (Tco) on the potable quality of the river water are employed for the quality assessment. The fuzzy inference system is composed by 3250 rules with a score from 0 to 100 and five verbal categories. The FWQI was validated by comparison with Vietnam national water quality index. The result of the study clearly shows that the Fuzzy Inference System (FIS) approach was a practical, simple and useful tool to assess surface water quality in river as well as irrigation networks.
Research on the Trend of Landfill Ecological Restoration Technology Based on Patent Analysis
Authors: Xie Q S , Sun H Y , Li Z , Chai T 
Published: July 2020

Abstract
Ecological restoration, as one of the important technologies for landfill treatment, has attracted much attention from governments and the academy of science and technology. In this paper, the focus is the analysis of the trends of ecological restoration technology of landfill, we make a comparative analysis of domestic and foreign patents from the perspective of application trends, major technical fields, main patentees, competition and risks by comprehensively using the platforms and tools such as the Chinese Patent Database, Derwent World Patent Index Database, and the European Patent Office Patent Literature Database. Our work is of referential significance for the development of China in this field.
Effects of Dibutyl Phthalate on Physiological and Biochemical Behaviors of Electroactive Biofilm
Authors: Dong Yue , Wang Peifang , Zhang Yixuan 
Published: July 2020

Abstract
Microbial electrochemical systems (MESs) are a promising clean energy source to directly convert waste chemicals in domestic wastewater to available electric power with synchronous pollutant removal. The physiological and biochemical behaviors of electroactive microorganisms (EAMs) is the key factor of the MESs. Dibutyl phthalate (DBP), as the emerging pollutant, widely exists in municipal wastewater which has strong ecological toxicity. So, utilization of MESs in the engineering practice of wastewater treatment must consider the impact of DBP on the physiological and biochemical behaviors of electroactive biofilm. The output voltage and power density of the MES decreased significantly with the increase of DBP in the synthetic wastewater. In addition, the EAMs resisted the stimulation of DBP by secreting more extracellular polymer substances (EPS) by microscopic observation. The composition and structure of the EPS also changed, mainly reflected in the increase of β-polysaccharide content and the expansion of its coverage area.
Fertilizers from monosodium glutamate waste encapsulated with chitosan nano-zeolite
Authors: Dosirjon I , Rahayu K L , Apriliana L , Ismiyarto  
Published: July 2020

Abstract
Fertilizers that are safe for the environment are highly necessary to increase the agricultural productivity in handling critical land conditions, where nutrients contained in the soil are far below the normal levels of 4–5 %. This nutrient crushing occurs due to the use of synthetic chemical fertilizers, pesticides, and excessive chemical drugs. Therefore, the authors make fertilizer with a high slow release of zeolite, chitosan from the skin shell and monosodium glutamate (MSG) waste. The method used is demineralization, deproteination, and deacetylation to obtain chitosan. After that, the zeolite encapsulation was activated by chitosan and MSG waste. The product obtained is in the form of a milling solid using HEM to obtain the results of nanoparticles. These results were characterized by FTIR, SEM-EDX, XRD. XRD results refer at (angle (2θ): 20) containing NH2 compounds, at (angle (2θ): 21–23) containing SiO2, then at spectra (angles (2θ): 25–28) containing LiAl SiO4 compounds then at (angle (2θ): 30–34) containing C and at (angle (2θ): 42–44) containing FeO4 P. SEM results show MSG micrographs wrapped in nano-zeolite and nano-chitosan fertilizers with a sample size of 90-100nm and it is known that in MSG waste fertilizer encapsulated with nano zeolite-chitosan containing micronutrients in fertilizers such as Si as much as 10.7 %, sodium 11.8 %, nitrogen 11.8 %, 1.2 % iron, potassium 0.3 % and 0.1 % phosphorus. The FTIR results showed a peak in the fingerprint area of the MSG-zeolite-chitosan waste spectra that identified the presence of macro nutrients N, P, K, Ca, Mg and several micro elements such as Cu, and Zn in addition to other elements needed in slow release fertilizers.
The extraction of lineaments from satellite images in Phayao-fault zone
Authors: Sukphornsawan N , Suwanprasit C , Wongpornchai P 
Published: July 2020

Abstract
Lineament mapping is an important part of structural geological investigation that are important features showing subsurface elements or structural weakness, such as geological faults. Most of lineament features are normally extracted by visual interpretation of enhanced image data. The main objective of this work was to develop a method for semi-automatically extracting lineament using remote sensing data. Landsat 8 OLI original image (excluded band 1, 8, 10 and 11) of Phayao-fault zone was operated. There were three main steps in the study including 1) improve quality of dataset using Principal Component Analysis (PCA), 2) delineate lines from the result of quality improvement and 3) classify lineament using visual interpretation. The results from PCA – Band 3 showed the most correlated when compared with existing data. The extracted lineaments were correlated to geological lineament, stream and road network about 42.46 %, 20.52 % and 7.22 % respectively.
Pseudo-3D seismic construction using tau-p transform interpolation
Authors: Novrizal  , Riyanto A , Yulianto E , Abdullah F 
Published: July 2020

Abstract
Three dimensional (3D) seismic imaging is very important in hydrocarbon exploration. However, 3D seismic data acquisition costs more expensive than 2D seismic data acquisition. Therefore, the explorations are mostly done with some 2D seismic lines and requiring some interpolation method to construct the 3D seismic model called Pseudo-3D Seismic. In other word, the 3D model depends much on the interpolation process for a more reliable result. There have been many interpolation methods used to construct the 3D seismic model. Tau-P Transform is one of the methods that can be used to construct a 3D seismic model. It has been used to reconstruct seismic data and fill the near-offset gap in marine seismic data for decades. In this research, the method is done by having the crossline of some 2D seismic lines and performing the transformation from t-x domain to the tau-p domain. After the transformation, by inverse-transformation from tau-p to t-x domain, we might perform interpolation along the line to construct more traces with regular and near spacing. This method can be performed to all crosslines and construct Pseudo-3D Seismic. The results show constructed crosslines with well-lineated layers. The crosslines show developed layers are like those of the inline implying that the interpolation successfully construct the layers based on the inline.
Petrology and petrogenesis of igneous rock in Mount Endut, Banten Province
Authors: Adikusuma R , Sahdarani D N , Sihombing F M H , Supriyanto  , Kadja G T M 
Published: July 2020

Abstract
Mount Endut is a volcano located in the eastern part of Banten Province. Previous studies revealed that Mount Endut consists mainly of Quaternary volcanic and Tertiary plutonic igneous rocks respectively. This research focuses on the petrology of igneous rocks found in the southern region of Mount Endut in order to determine the type of igneous rocks, evolution of magma, and reconfirming historical geological process occurring in Mount Endut area. Petrographic analysis was performed on 11 samples and geochemical analysis was performed on 30 samples. Petrographic analysis revealed three types of igneous rocks, andesite porphyry, diorite porphyry, and dacite porphyry. Furthermore, geochemical analysis revealed that the igneous rocks in Mount Endut are comprised of basaltic andesite, andesite, dacite, basaltic trachy-andesite, trachy-andesite, and trachyte or trachydacite which originated from calc-alkaline magma series. The integration of petrographic and geochemical analysis supports the regional geological process where Mount Endut was formed either in an island arc or an active continental margin. The first section in your paper.