bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of filtration processes of a two-phase fluid in a zonal-inhomogeneous fractured-porous medium
Authors: Pyatkov A A , Rodionov S P , Kosyakov V P , Musakaev N G 
Published: December 2019

Abstract
A significant amount of proven reserves of hydrocarbons are contained in the fields to some extent have fracturing. Fractures have high conductivity, and, therefore, have a significant impact on the process of extracting oil from the reservoir. In this regard, it is necessary to investigate the filtration processes of a mixture of water and oil in fractured-porous reservoirs. In this paper, the task of selecting options for the appointment of injection and production wells in a zonal-inhomogeneous fractured-porous reservoir to the most complete extraction of oil from the reservoir. A study was also made of the influence of the intensity of water injection on the efficiency of oil recovery from a fractured-porous reservoir. The tasks were solved using our own three-dimensional two-phase hydrodynamic simulator based on the model of dual porosity-permeability.
On particle incipient motion from the sedimentation layer in shear flow
Authors: Seryakov A V , Bocharov O B , Ignatenko Ya S 
Published: December 2019

Abstract
This paper presents the results of numerical modelling for a laminar flow around a spherical particle located near a sedimentation layer. The particle being at the minimum distance from the rough layer is affected by a fluid shear flow with Reynolds numbers varying from 2 to 200. The considered fluids included Newtonian and power law ones. Depending on a shear Reynolds number, the critical Shields numbers have been determined to describe the particle’s incipient motion. The obtained parameters have been compared against those for a smooth surface to demonstrate that in some cases the differences in critical stress coefficients may reach up to 70%.
Numerical modeling of the nucleation of crystallization centers during the modification of the surface layer of a metal using laser heating
Authors: Shmagunov O A 
Published: December 2019

Abstract
Laser surface treatment using nanoscale particles of refractory compounds is a promising way to improve the operational characteristics of machine parts. Nanoscale particles increase the number of crystallization centers in the melt that occurs on the metal surface when exposed to a laser beam and, thereby, improve the dispersion and uniformity of the crystalline grains and the quality of the surface processed. The mathematical model used in the work allows one to describe the processes of nucleation and crystallization in the melt, the kinetics of the solid phase growth. Steady-state processes of heating, phase transition, heat transfer in the melt, nucleation, and growth of the solid phase are considered. The distribution of the temperature field, the size of the crystallization zone, and the number of crystallization centers in the molten metal are estimated.
Kerosene combustion in a supersonic flow
Authors: Tretyakov P K 
Published: December 2019

Abstract
A new approach is proposed to the initiation of kerosene combustion in a supersonic airflow with the stagnation temperature below 2000 K, which consists of a pulsed-periodic gas-dynamic action on the flow. The experiments have shown that it is possible to implement a quasi-steady pulsed combustion mode by choosing the parameters of pulses: energy, duration, and frequency.
Gas dynamics of the body flight in the channel
Authors: Fomin V M , Nalivaychenko D G 
Published: December 2019

Abstract
The gas dynamics of the body high-speed flight in a channel is studied by the numerical simulation method. It is shown that in the considered formulation of the problem, it is possible to implement one of the two versions of the gas-dynamic flow pattern: the body movement with a forward straight shock wave (“unstart”) and the supersonic current near the body (“start”). The behaviour of aerodynamic and thermodynamic loads on the body as it accelerates to high speeds is studied.
The experimental study of the weak shock wave action on the boundary layer of the sweep flat plate
Authors: Kocharin V L , Kosinov A D , Yatskikh A A , Afanasev L V , Ermolaev Yu G , Semionov N V 
Published: December 2019

Abstract
The weak shock waves impact on the flow in the boundary layer of the sweep flat plate at Mach number 2 is studied experimentally. The model was installed at a zero angle of attack. Shock waves in the oncoming flow were generated by a two-dimensional roughness on the side wall of the wind tunnel test section. The data were obtained with a two-dimensional roughness on the wall of the wind tunnel and with a smooth wall at sweep angles (35 and 40 degrees) of the leading edge of the flat blunt plate. The measurements were carried out with a constant temperature anemometer.
Quadcopter propeller characteristics in the oblique flow
Authors: Polivanov P A , Sidorenko A A 
Published: December 2019

Abstract
The paper analyses the effect of the yaw angle and free-stream velocity on the stationary and unsteady characteristics of a propeller with a fixed geometry. Propeller characteristics are calculated in two ways: the first uses the 3D RANS modelling, the second involves the simplified analytical model. Comparison of the two calculation methods showed a qualitative coincidence of the data. The effect of the yaw angle on the propeller characteristics is investigated for a wide range of parameters. It is found that the dynamic loads generated by the propeller are significant and should be taken into account when designing quadcopter propellers.
Computational grid adaptation for the sonic boom near field modeling
Authors: Kiseleva T , Temerbekov V 
Published: December 2019

Abstract
This paper discusses the numerical simulation of the 69-Degree Delta Wing Body for computing the sonic boom signature in the near field. For flow field calculation, the commercial CFD flow solver ANSYS Fluent is employed. The computational mesh in the perturbed flow regions was refined two times using the automatic gradient adaptation. The results are in agreement with the results obtained by other researchers.
Numerical simulation of stationary flow around a wing with a subsonic leading edge at M = 2 and 2.5
Authors: Semenov A N , Kocharin V L , Semionov N V 
Published: December 2019

Abstract
The results of direct numerical simulation of the stationary flow above the wing with a swept angle of 72° and a subsonic leading edge are presented. The simulation was carried out at Mach numbers 2 and 2.5 and unit Reynolds numbers 9e+6 m-1 and 11e+6 m-1.
Effects of water content to slope stability in Pangkalan Lima Puluh Kota
Authors: Asnur H , Yuliet R , Hakam A , Putra H G , Sunaryo  
Published: December 2019

Abstract
The objective of the study was to investigate the relationship between soil water content and steepness stability in the three locations of Pangkalan District of Lima Puluh Kota. The sample data in the form of soil is tested to obtain a plastic and liquid Boundary so that it can be investigated soil strength and its relation to the water content. The test is done by determining the sample strength parameters in the initial conditions, then the water content of the sample is modified according to the plastic and liquid boundaries, as well as the unit volume. The figures for slope stability analysis were analyzed using laboratory and cross-sectional results. Test results show that the water content is the most important factor affecting the stability of the slope. Slope stability becomes critical when the water content is close to its liquid limit. However, the water content less than the plastic limit also results in a less strong soil parameter for the sample being remolded. To reduce slope failure, it is recommended to establish water control facilities in the area.
The sustainability factors of tourist village (case study: Ngadas Village, Poncokusumo District, Malang Regency)
Authors: Sari N , Springfield D R , Sari K E 
Published: December 2019

Abstract
Tourist village is a form of unit between attractions, accommodation and supporting facilities on a community structure that merges with the rules and traditions which apply and is packed in the form of a tourist village. The development of a tourist village as an activity to explore the potential of a village into a tourist attraction requires community involvement, especially in the development of supporting infrastructure. The sustainability of tourism village development is supported by many factors, both internal and external. The development of a tourist village involves various aspects that interact and influence each other. Ngadas Village is one of the tourist village in Poncokusumo District, Malang Regency which mostly inhabited by Tengger Tribe. Ngadas village is established by the government as a tourist village with a strategic village location, natural potential and the uniqueness of the tribe that live in it. As a form to maintain the tourism activities, it is necessary to identify the sustainability factors of tourist village. The result can be use as an input to direct Ngadas Village as a sustainable tourist village.
The use of artificial wastewater for water feeding of scrubber for treating coal burning emission
Authors: Huboyo H S , Sudarno  
Published: December 2019

Abstract
The use of clean water for wet scrubbers needs to be reduced for water resource efficiency in the company. This research was conducted to examine the use of wastewater as wet scrubber feeding from boilers that use coal fuel. The scrubber type was spray tower using stainless steel material and packed bed with marbles. Artificial waste was made to imitate textile wastewater. Emission measurements at the outlet adopted SNI standard. Parameters observed in the flue gas were particulate (isokinetic), SO2, and NO2. We also observed the TSS and COD concentrations in the scrubbing liquid. The reduction pollutants concentration using artificial waste was 21 - 51% for particulate, about 45% for SO2 concentration, and more than 90% for NO2 concentration. The parameters of COD concentration in the outlet decreased by about 20% while the TSS concentrations increase almost two fold. This initial study shows that the use of wastewater for scrubbers is promising although it produced TSS pollutants in scrubbed wastewater.
Recycling of textile sludge for removing textile dye of reactive red 231 on aqueous solution
Authors: Rahman A , Kishimoto N , Urabe T , Ikeda K 
Published: December 2019

Abstract
Carbonization treatment successfully converted textile sludge into potential adsorbent. The carbonization was performed at the range of 400 to 800 °C without oxygen involved. In order to investigate the adsorption performance of carbonized sludge then a series of adsorption tests was carried out. Adsorption experiments indicated that the highest adsorption capacity was obtained at the carbonization temperature of 400 °C. The maximum adsorption capacity for removal textile dye of reactive red 231 on aqueous sollution was reached 49.1 mg/g. The pH of carbonized sludge played a significant role in the adsorption of reactive red 231 in the solution. Since the reactive red 231 is categorized as an anionic dyes, the lower pH was appropriate to accelerate adsorption process through charge neutralization by abundant H+ ions.
Analysis of Indonesian Forest and Land Fire Controlling Operational Policies. Case Study: Siak Regency, Riau Province
Authors: Putra Irfan Kemal , Saharjo Bambang Hero , Wasis Basuki 
Published: December 2019

Abstract
Indonesia has been struggling with forest and land fires for decades due to its large, multi-dimensional impacts. While less hotspots in 2016 were due to the La Nina, Indonesia has managed to reduce the hotspots in normal condition in 2017. However, there were indications that some of the policies were outside of the legal jurisdiction, e.g. to involve institutions out of their legal roles in fire controlling operations. Thus, this paper qualitatively discussed the analysis of fire controlling policy in Indonesia with Siak Regency as the case study. Data collection used semi-structured interviews with key informants from related agencies and experts, as well as supported by literatures. Meanwhile, policy and actor analysis were used to approach the issue. The findings revealed that the lack of resources and personnel has forced some actors to dominate. In this case, the establishment of complementary regulations should accommodate and legalised some policy implementers who did not have the ‘rights’ to involve in the forest and land fire reducing programme.
A Preliminary Biodiversity Survey in Mursala Island: Implication for Conservation
Authors: Fambayun R A , Rachmat H H , Susilowati A 
Published: December 2019

Abstract
Biodiversity refers to all living creatures, including plants in terms of its genetic variation, ecosystem variation, number of species within an area, etc. However, the high anthropological disturbances in a specific area will bring a negative effect on the biodiversity existence. Mursala Island is the biggest island in Central Tapanuli, North Sumatra that has already known for its timber species richness. The island is experiencing disturbances due to forest conversion and illegal logging in which threatening the vegetation occurrence on this Island. We did a preliminary survey by establishing six plots of 20×20 m in different locations within Mursala Island to investigate the current biodiversity condition on this island, especially its plant species. We calculated density, species diversity, and species richness. We found a total of 77 different species with a total density of 680 stems/ha of the individuals >10 cm in diameter. Based on the Shannon Diversity Index, the species diversity in this area is 1.85 or equivalent diversity as a community with six equally-common species, with the species richness Dmn = 0.33. The results indicated the island has a less diverse community. Hence, our conservation strategies are required to increase the biodiversity value of this island.
Above-Ground Biomass and Carbon Stock of Ciletuh Mangrove Forest, West Java, Indonesia
Authors: Kusmana C , Hidayat T , Hikmah W F 
Published: December 2019

Abstract
Mangrove forest is a unique ecosystem that plays important roles to climate change control, as carbon sink and CO2 absorbing from the atmosphere. This research was aimed to estimate the potential of above-ground biomass and carbon stocks of Ciletuh mangrove forest, West Java, Indonesia. Mangrove forest area and occupation of dominant species were mapped using Geographical Information System, meanwhile species composition and forest structure was sampled using 198 plots (20 m × 20 m each) systematically spread out at studied forest area. Vegetation analysis data were used to estimate the potential of above-ground biomass and carbon stocks. Above-ground biomass and carbon stock of mangrove species was estimated using allometric models that already available. The results showed that mangrove forest in Ciletuh covered an area amounted to 8 ha. There were 18 tree mangrove species dominated by species of non-Rhizophoraceae belonging to 14 genera of 11 families. Above-ground biomass of Ciletuh mangrove forest was estimated at 31.78 t ha−1, carbon stock at 14.93 t C ha−1, and CO2 absorption at 54.68 t ha−1.
Application of planting hole sizes, seedling sizes of meranti (Shorea johorensis) and planting media for the rehabilitation of skidding road
Authors: Prameswari D , Supriyanto  
Published: December 2019

Abstract
Timber harvesting in natural forest caused damage along the skidding roads. This research studied the effects of planting hole sizes, seedling sizes and culture media on the growth of Meranti (Shorea johorensis) at skidding roads. This study used factorial in completely randomized block design 3 × 2 × 2 in three replicates. The first factor was planting hole sizes (A1 :, A2 : 40 × 40 × 40 cm, A3: 40 × 40 × 50 cm), second was seedling size (B1 : decapitated seedlings for 10 cm, B2 : non-decapitated seedlings) and third was culture media (C1 :, C2: soil and wood charcoal). The results showed that the growth of Shorea johorensis plantation coming from 10 cm decapitated seedlings at 3-year-old after planting grew well and better than non-decapitated one. The appropriate planting hole size and culture media for planting Shorea johorensis were 40 × 40 ×30 cm and soil and top soil. The success of seedling regrowth is one of solutions to overcome seedling damage during seedling transportation.
Improving The Carrying Capacity of Vertisol nd Alfisol on Dryland Ecosystem by Applying Active Powder of Cassava
Authors: Prijo Soetedjo IN 
Published: December 2019

Abstract
Alfisol and Vertisol have low nutrients content. Improving the carrying capacity of the soils applying an organic and organic fertilizer resulted in increasing of soil compaction and increasing of soil microbiology. Research had been done to know the effect of various dosages and time applications of powder active to improve the carrying capacity of Vertisol and Alfisol at the germinating land Ecosystem in East Nusa Tenggara. Factorial research designed as Randomized Completed Block Design replicated four times. Variables of the research were a various dosage of active powder (0, 100, 200, and 300 g/ha), and various time application active powder of cassava (on planting, seven days after panting, and 15 days after planting). The result showed that the active powder applied to cassava significantly increase the colony number of soil bacteria, improving in soil porosity, soil bulk density, total N, availability of P and K, C organic, and soil pH. Application active powder of cassava by 200-300 g/ha was able to improve the physical and chemical characteristics of Vertisol and Alfisol.
Utilization System of Sandalwood in Aceh Besar and Pidie Districts
Authors: Nurochman D , Matangaran J R , Santosa G , Suharjito D , Sari R K 
Published: December 2019

Abstract
The utilization of sandalwood is a series of activities to utilize and seek sandalwood, including: managing of sandalwood trees and sandalwood processing. This study aims to evaluating the utilization of sandalwood in Aceh as a unified system. Sandalwood trees management analyzed based on structures of the trees, management techniques and utilization rates of sandalwood. Analysis of the physical characteristics of wood and the proportion of santalol compounds are used for the purpose of sandalwood processing. The results of the study indicate that sandalwood management has not been carried out sustainably with the structure of the sandalwood trees dominated by young trees, no cultivation activities and low harvesting efficiency with harvesting method using tree lenght logging plus root. Processing of sandalwood for the purposes of woodcrafts and sandalwood essential oils that meets quality standards comes from the trees with a proportion of terrace wood above 48.53% with diameter (dbh) ⩾ 15 cm.
Anatomical Characteristics of Six Calamus Species of Kalimantan Barat
Authors: Dewi A P , Ariyanti N S , Walujo E B 
Published: December 2019

Abstract
The stem anatomy of six species of Calamus from Kalimantan Barat was studied to explore the anatomical character to distinguish the rattan at the species level. The Calamus species has been used as the raw material of plaited art by the indigenous people of the Dayak Iban-Desa. The anatomy character was observed from the transversal section, radial section, and maceration. The main aspect has observed from this research are epidermis, vessel, and fiber dimension. Epidermis cell type, epidermis lumen type, and the number of hypodermis layer were observed as the important character to distinguish the Calamus based on epidermis character. Type of ground parenchyma, present of the canal resin, number of protoxylems, and vessel density are the important characters based on vessel character. Fiber length and fiber wall thickness are the important characters to identify the rattan species and also to predict the quality of rattan stem. The tentative identification key to rattan species has been prepared using the combination of the anatomical character.
Study on Evaluation of Beijing-Shanghai High-speed Railway Operation Safety
Authors: Wang Zhuo , Deng Xiaorong 
Published: December 2019

Abstract
The study aims to evaluate operation safety level of Beijing-Shanghai High-speed Railway in China. In order to do so, this research establishes a safety assessment index system of Beijing-Shanghai HSR based on AHP firstly. Then based on the fuzzy matter-element theory, with the concept of the Euclid approach degree (EAD), compound fuzzy matter-element for safety level evaluation is established. The results show that Beijing-shanghai HSR is a better operation safety level in China. According to the results, some suggestions on improving Beijing-shanghai HSR operation safety are proposed.
Design and Implementation of SOA-based Technical Service System for Road Transport Vehicles
Authors: Jia Hong , Xia Haiying , Liu Yingji , Dong Guoliang 
Published: December 2019

Abstract
To promote the unified declaration and review of standard-compliant vehicle models more effectively and increase the efficiency of declaration of standard-compliant vehicle models, this paper designed a SOA-based road transport vehicle technical service system and realized its related functions. In the SOA-based system, the loose coupling relation between functions of applications and the adoption of open standards makes the system easy to maintain and has considerable business flexibility. The application of road transport vehicle technical support service system effectively meets the functional requirements of carmakers, car testing agencies, reviewers and system administrators, provides a good business platform for declaration of standard-compliant vehicle models and effectively makes related activities more IT enabled.
Research on Comprehensive Evaluation Index System of Traffic Infrastructure Construction
Authors: Chen Zhi-Yu 
Published: December 2019

Abstract
In order to accelerate the modern engineering management, promote the transformation and upgrading of highway and waterway engineering construction and development, improve the quality, safety and operation service level of highway and waterway engineering, the article sets up an evaluation index system on seven promotion such as engineering design level, management level, technological innovation ability, quality level, safety level, green environment level and soft power of quality engineering. This article combines Delphy Method and analytic hierarchy process (AHP) to analyze the weight of the index, select the project to carry on the empirical evaluation. Finally, this article examines the scientificity and rationality of the evaluation index system.
Stability analysis of articulated dump truck based on eigenvalue method
Authors: Fang Weiping , Yang Xiaojun , Zhao Weijian , Liu Benchao 
Published: December 2019

Abstract
The lateral stiffness of articulated dump truck is relatively weak. When articulated dump truck is running, the driving stability is deteriorated and it is prone to occur “snake shape” instability phenomena. Taking the force and its mechanical characteristics of articulated dump truck with three axles into account, the dynamic mathematical model of the 3-DOF was established using the Lagrange equation. Based on the Lyapunov stability principle, the driving stability of articulated dump truck was analyzed using the eigenvalue method. The dynamic mathematical model can be used to analyze the influence of the following parameters on driving stability, such as different speed, centroid position, steering parameters, wheelbase, mass etc. It can provide theoretical basis for parameters optimization in stability control and stability design.