bluuebunny/crossref_metadata_2025_split huggingface dataset:
Filtration combustion inside a porous cylindrical pipe with axial gas flow
Authors: Dats E P , Minaev S S , Kirdyashkin A I 
Published: December 2019

Abstract
The filtration gas combustion in a porous tube with injection of a combustible mixture through the end surface of a porous cylindrical tube is theoretically studied. The simulation of the filtration gas combustion was carried out in the framework of the two-temperature thermal-diffusion model. Numerical modeling allowed to estimate the range of gas flow rates at which a stable combustion regime is observed, to find the temperature distribution in the gas and the porous body, and to evaluate the radiation fluxes inside the reactor.
Propagation of shock waves formed by explosion of the air-propylene mixture in a T-pipeline
Authors: Fedorova N N , Fomin P A , Valger S A 
Published: December 2019

Abstract
The paper deals with mathematical modelling of the process of an explosion of a cloud of reactive gases and its impact on the environment. The research may be relevant to ensure fire safety and to prevent explosion hazards at industrial production facilities that use reactive gas mixtures as a working medium and at high-pressure industrial pipelines used for their transportation. The goal of the study is to develop and test a computational technology for numerical modelling of clouds of reactive gas mixture expansions and loads evaluation. To describe the chemical processes in the explosion, a simplified mathematical model is proposed which based on the assumption of frozen chemical reactions. Using the model, a set of User Defined Functions is implemented in ANSYS Fluent and applied for solving a problem of a “propylene-air” cloud explosion inside the T-shape tube with two closed and one open ends.
Propagation of cellular detonation in a gas suspension in the presence of a concentration gradient
Authors: Khmel T A , Fomin P A 
Published: December 2019

Abstract
Models for the description of detonation flows in inhomogeneous gas particle mixtures are presented. The physical and mathematical model of heterogeneous detonation of aluminum suspensions is based on approaches to the mechanics of heterogeneous media and semi-empirical laws of ignition and combustion of particles. The model is extended for suspensions that are inhomogeneous in particle concentrations. This suggests the solution of an additional equation for the spatial distribution of initial concentrations. The dependence of the integral heat release of chemical reactions and the fraction of unburned particles on the initial composition is determined from the solution of the stationary problem of the structure of the detonation wave and its agreement with empirical data on the rate of normal detonation. The model for describing detonation in mixtures of reacting gases with inert particles is based on an analysis of the state of chemical equilibrium. The problem of the initiation and development of cellular detonation in a flat channel in the presence of a longitudinal or transverse gradient of the concentration of aluminium particles is considered. The limits of changes in concentrations from poor to super stoichiometric compositions are considered for 1 μm particles. When detonation propagates along a channel with a longitudinal positive (negative) concentration gradient, the cellular structures do not change, but the average and peak values of pressure and phase density increase (decrease). With a transverse concentration gradient, cell-like structures with a curved front, asymmetric and strongly elongated cells form in the channel. The results are consistent with studies of similar gas detonation flows.
Study of propagation of heterogeneous detonation in a layer of aluminium particles
Authors: Khmel T A , Lavruk S A 
Published: December 2019

Abstract
The propagation of heterogeneous detonation along a channel partially filled with a reacting mixture is considered using numerical simulation methods. Two different regimes of propagation are observed. Flow patterns and fields of maximum pressure are analyzed. It is found that decrease of the cloud thickness leads to decreasing velocity of detonation propagation.
Combustion of a coal dust suspension in a pipe during the swirl
Authors: Moiseeva K M , Krainov A Yu , Tarasenko Yu A 
Published: December 2019

Abstract
This manuscript presents the research on the combustion problem of a coal dust suspension in a pipe under the swirl flow condition. The physico-mathematical model is based on the approaches of the mechanics of multiphase reacting media by R. I. Nigmatulin. The solution to the problem is performed in a two-dimensional axisymmetric formulation. Godunov’s scheme is used to solve the equation system of the model. The paper provides the results of the parametric analysis of the problem and data on the influence of the flow swirl on the gas temperature fields in the pipe at the initial stage of combustion. The presence of a significantly swirl flow leads to the incomplete combustion of coal dust in the pipe.
Experimental study of the low-melting hydrocarbons regression rate in the air flow
Authors: Shiplyuk A N , Zvegintsev V I , Frolov S M , Vnuchkov D A , Lukashevich S V , Nalivaychenko D G 
Published: December 2019

Abstract
Gasification of organic and inorganic materials in a high-temperature gas flow is a promising technology for various industrial applications like chemical industry, waste processing, rocket and air-breathing propulsion, etc. However, the characteristics of the gasification process of low-melting hydrocarbon materials remain insufficiently studied so far. In this work, experiments on the gasification of cylindrical polypropylene (PP) samples by the airflow passing through multiple longitudinal channels 3 to 4 mm in diameter and 200 mm long are performed. The temperature, pressure, and velocity of the airflow in the experiments range from 300 to 1500 K, 0.35 to 1.38 MPa, and 17 to 100 m/s. As expected, oxygen available in the airflow interacts with PP and creates an additional heat source for PP gasification, thus, enhancing the gasification process. At an airflow temperature of 1480 K, the maximum mass flow rate of gasification products is shown to attain 17.7 g/s. The minimum ratio of the mass flow rates of the airflow and gasification products reaches the value of 2. In tests with airflow temperature of 300 K, the maximum mass flow rate of gasification products is 8.5 g/s. The minimum ratio of the mass flow rates of airflow and gasification products is 5 in these experiments.
An experimental study of the combustion of paraffin and ceresin with the addition of metal-organic compounds in an oxygen stream
Authors: Shiplyuk A N , Lukashevich S V , Simagina V I , Netskina O V , Komova O V 
Published: December 2019

Abstract
Experimental studies of the combustion of experimental samples of ceresin and paraffin with the addition of metal-organic compounds in a gaseous oxygen flow were performed. The tests were carried out at a pressure of 8.5 to 10.5 bar and an oxygen flow velocity of 10.5 m/s. An increase in specific impulse of 10% was obtained for samples based on ceresin and from 6 to 18% for samples based on paraffin.
Innovative projects of the development of high-speed transport in Russia
Authors: Fomin V M , Malov V Y , Nalivaychenko D G 
Published: December 2019

Abstract
Continuous development of transport systems at the state level is an urgent task, the success of which will largely determine the dynamics of improving the quality of life and trade and economic efficiency of regions, cities and the state as a whole. To make a qualitative transition to a fundamentally new concept of transport is possible only based on scientifically sound approaches and fundamental analysis of all aspects of the creation and operation of the transport system.
Evolution of artificial disturbances in swept wing supersonic boundary layer
Authors: Kolosov G L , Panina A V , Kosinov A D , Kosorygin V S , Yatskikh A A 
Published: December 2019

Abstract
Experimental data on the evolution of artificial controlled travelling disturbances in a three-dimensional supersonic boundary layer on a 45° swept wing at Mach number 2.0 is presented. Artificial disturbances were introduced in the boundary layer using a periodical glow discharge with a frequency of 20 kHz. Pulsations of the boundary layer were measured with a constant-temperature hot-wire anemometer and the probe moved parallel and not parallel to the leading edge of the model. In both cases spatial-temporal and spectral-wave characteristics of the wave train development were obtained and quantitatively compared with each other. This paper discusses the suitability of the method for measuring fluctuations fields when the probe is moving not parallel to the leading edge of the model.
Flame propagation features in still wood dust suspension in the air
Authors: Moiseeva K M , Krainov A Yu , Chentsova S K 
Published: December 2019

Abstract
This paper presents the numerical investigation on combustion of a still wood dust suspension on the air. The aim of the research is to determine the flame propagation features through the suspension under changing the size and mass concentration of the dust particles. The manuscript also provides data on parametric analysis of the problem. The conducted simulation has shown that the shape of the flame depends on the size, the particle mass concentration and the content of volatile components in the particles.
Features of the interaction of localized free-stream disturbances with the straight and swept wing boundary layer
Authors: Katasonov M M , Kozlov V V , Pavlenko A M , Sadovskii I A 
Published: December 2019

Abstract
Under the conditions of a model experiment, the features of the appearance and spatial development the boundary layer disturbances – wave packets (precursors) and longitudinal localized structures were studied. Localized disturbances were created artificially upon local exposure of an external source to the boundary layer of the straight and swept wing with a low turbulence level of incoming flow. Wave packets formed near the fronts of longitudinal localized structures. The studies were carried out in a subsonic low-turbulent wind tunnel. Flow perturbations were recorded using a constant-temperature hot-wire anemometer.
An experimental study of the influence of the type of turbulent wake on the flow around models of wings of various shapes
Authors: Pavlenko A M , Zanin B Yu , Katasonov M M , Bykov A V 
Published: December 2019

Abstract
This paper presents the results of experimental studies aimed at studying the influence of the type of turbulent wake on the flow around models of various shapes. The patterns of visualization of flow structure for each flow regime were obtained on all models. The structure of the turbulent wake in space for two sources of disturbances is investigated. A comparison was made between the results. It was found that, depending on the type of turbulent wake, the separation region can significantly decrease in size.
Dynamics of drying of fibrous material by the acoustic-convective method
Authors: Zhilin A A 
Published: December 2019

Abstract
The drying of a cellulosic fibrous material by acoustic-convective and thermal-convective methods under different conditions has been studied. Using the thermal-vacuum drying method, the weight of an absolutely dry sample of the starting material was determined and used to calculate the initial absolute and relative moisture contents, which were 12.38% and 10.96%, respectively. The dynamics of capillary impregnation and sorption wetting of samples was determined. The limiting values of the absolute and relative moisture content of cellulose fibers were found to be 862.16% and 89.47%, respectively. The kinetic curves of moisture extraction obtained in acoustic-convective and thermal-convective drying under different conditions were constructed, analyzed, and compared. It is shown that the acoustic-convective extraction of moisture has an advantage over the thermal-convective method.
Comparison of nonequilibrium dissociation models in the direct simulation Monte Carlo method
Authors: Galeyev A Ye , Kashkovsky A V , Shevyrin A A , Bondar Ye A 
Published: December 2019

Abstract
Various chemical dissociation reactions models (Total collision energy model – TCE, Quantum Kinetic model – QK and Extended vibrational bias model – EVB) were implemented in the direct simulation Monte Carlo code SMILE++. It was shown that the dissociation models considered predict the same reaction rate over a wide range of temperatures in thermal equilibrium case. The analysis for the nonequilibrium case was carried out on the basis of dissociating nitrogen gas flow modelling around the wedge for the Hornung and Smith experiments conditions. All dissociation models proposed predict various results both in the standoff distance of the bow shock wave and in the temperature values behind it. It was generally shown, that taking into account the vibrational favoring (during dissociation) results in decreasing the reaction rate, which can be manifested in increasing the shock wave standoff distance.
Reduction in surface climate change achieved by the 1987 Montreal Protocol
Authors: Goyal Rishav , England Matthew H , Sen Gupta Alex , Jucker Martin 
Published: December 2019

Abstract
The benefits of the 1987 Montreal Protocol in reducing chlorofluorocarbon emissions, repairing the stratospheric ozone hole, shielding incoming UV radiation, reducing the incidence of skin cancer and mitigating negative ecosystem effects are all well documented. Projected future climate impacts have also been described, mainly focused on a reduced impact of the mid-latitude jet as the ozone hole gradually repairs. However, there is little appreciation of the surface warming that has been avoided as a result of the Montreal Protocol, despite CFCs being potent greenhouse gases. Instead, the issue of ozone depletion and climate change are often thought of as two distinct problems, even though both ozone and CFCs impact Earth’s radiation budget. Here we show that a substantial amount of warming has been avoided because of the Montreal Protocol, even after factoring in the surface cooling associated with stratospheric ozone depletion. As of today, as much as 1.1 °C warming has been avoided over parts of the Arctic. Future climate benefits are even stronger, with 3 °C–4 °C Arctic warming and ∼1 °C global average warming avoided by 2050; corresponding to a ∼25% mitigation of global warming. The Montreal Protocol has thus not only been a major success in repairing the stratospheric ozone hole, it has also achieved substantial mitigation of anthropogenic climate change both today and into the future.
Foundation stability on sandy soil due to excessive pore water pressure: laboratory observations
Authors: Hakam A , Yuliet R , Risayanti  , Putra H G , Sunaryo  
Published: December 2019

Abstract
Pore water pressure is a factor which contributes to foundation stability. The change in pore water pressure in soil mass may affect the bearing capacity of the foundation. Especially for sandy soil, the increased pore pressure may cause the foundation collapse. This study investigates the stability of soil-foundation system due to the increase of pore pressure using a scaled model in the laboratory. The sands were taken from Siteba Padang and sieved pass through sieve no. 40. The calculated relative density of sample in the box model is 51.76%, which indicated the medium sand density. The model was made up to obtain saturated condition. The increased pore water pressure was performed using upwards seepage method in several steps, which are monitored through piezometer pipes. The tests results show that at the last step, the sand boil happened on the soil surface that result the sink of foundation model. It also indicates the loss of bearing capacity due to the loss of effective stress in the soil mass. The Mohr-graphs is also performed to figures the stress in the soil mass. The graph also can show the collapse points in the soil mass during the test.
Strategy for developing sustainable ecotourism
Authors: Wahono P , Poernomo D , Kusumah M S 
Published: December 2019

Abstract
This paper examines tourism development using a sustainable ecotourism strategy. Tourism drives the world economy that is being hit by a crisis, but tourism also has the potential to damage the environment, if not carefully managed. A particular strategy for tourism development is needed as a way to deal with the trade-offs between economic progress versus environmental damage. Indonesia, as the world’s largest archipelagic country and the nation with the most diverse cultures, is actively developing tourism. The findings of the study in Banyuwangi, an area that is directly adjacent to the Bali tourist destinations, shows that ecotourism can minimize the adverse effects of tourism development. Until now, at least the implementation of ecotourism can be a way out of environmental preservation while fulfilling the economic demands of the community. The Banyuwangi Government commitment is also an essential aspect for the success of this strategy. Coastal, mountain, and cultural conservation tourism have also become a tourist attraction. This study used a qualitative method to explain the process and phenomenon in that area. Data was obtained through observation, in-depth interviews, and focus group discussions (FGD) with representatives of local government and tourism actors.
Termite assemblage structure in Batam Island, Indonesia
Authors: Himmi S K , Wikantyoso B , Ismayati M , Fajar A , Meisyara D , Krishanti N P R A , Zulfiana D , Lestari A S , Tarmadi D , Kartika T , Yusuf S , Takematsu Y , Yoshimura T 
Published: December 2019

Abstract
Termite’s biodiversity is known to be strongly affected by disturbance, particularly in an urban area. The present study evaluated termite biodiversity and distribution in Batam Botanical Garden, an urban conservation area in Batam Island. In the surveyed area, termites could play a major beneficial role through the promotion of essential ecological processes in ecosystems, such as soil modification and rehabilitation; as well as their well-established role as pests for vegetation. Therefore, biodiversity evaluation of termite is very important to identify economically and ecologically important species. Termite survey had been conducted by a 100 × 2 m belt-transect. Transect area was divided into 20 sections (5 × 2 m), in which each section was surveyed for 30 minutes by two trained people. In total, 106 specimens (15 termite genera) were collected from three sampling sites: Plantation, Mangrove forest, and Forest.
The mapping of sustainable food agriculture land in Kediri City
Authors: Sari K E , Deswita F V 
Published: December 2019

Abstract
Land is the main capital for agricultural sector’s development. Kediri City has the potential agricultural land area of 1900 ha, which spreads in three districts (Mojoroto, Pesantren, and Kota). 0,27% of Kediri’s Regional income comes from the agriculture sector and provide 30% of the food needs of Kediri City. The sustainability of agriculture lands in Kediri competes with other sectors which become the leading sector of Kediri such as Industry, services, and tourism. The government of Kediri City has the potential agricultural land assets of 548 ha to be developed into sustainable food agriculture land. However, the existing conditions indicate most of the rice agriculture land of Kediri planted with sugar cane, which is not food commodity. Therefore, the aim of this research is to analyze the physical potential of the Kediri agriculture land and analyze the needs of food agriculture land in Kediri City based on population projection. Variables needed to analyze physical potential of agriculture land were topography, soil type, crops commodity, irrigation system and Kediri City’s spatial land use planning. Based on the results of physical potential analysis, it is known that the Kediri City has a potential food agriculture sustainable land that covers an area of 407.26 ha, the potential of alternative sustainable food agriculture land that covers an area of 971.24 ha with the total area of sustainable food agriculture land of 1,378.46 ha. The result shows that until the year 2038, Kediri City requires 892,46 ha of rice agriculture land area. Comparing between the potential and the need for food agriculture land indicates that until 2038, the city of Kediri has sufficient agriculture land to be developed into a sustainable food agriculture area of Kediri City.
Initiation of onion callus (allium wakegiaraki) varieties of lembah palu at various light intensities
Authors: Maemunah  , Yusuf R , Samudin S , Yusran  , Hawalina  , Rini N S 
Published: December 2019

Abstract
Onion ( Alliumwakegi Araki) is a popular herb and vegetable commodity that can be used as a flavoring dish or traditional medicine. This study aims to determine the effect of light intensity for callus growth. This research was conducted at Plant Biotechnology Laboratory, Faculty of Agriculture, Tadulako University using Completely Random Design (RAL) with a single factor that is light intensity (A) consisting of 3 levels, i.e., 0-100 lux (A1), 300-800 lux (A2) and 1000-4000 lux (A3). The results showed that the onion cultured on the light intensity 1000-4000 lux accelerated the formation of onion callus varieties of lembahpalu. This callus began to form at 13.17 days after cultured. The light intensity 300-800 lux accelerated callus formation at a high percentage and embryonic callus cells. The percentage of callus formation reached 32.46%, resulting callus color was white up to 4 WAC (Week After Culture). The average color of white callus was found on 4 WAK with the average texture of crumb callus, while at the 6th and 8th WAC the color of callus was yellow.
The improvement of Cipunagara River quality (BOD parameter) based on pollution load analysis of domestic, agriculture, farming and industrial activities
Authors: Juwana I , Nugroho D P 
Published: December 2019

Abstract
In many regions in Indonesia, rivers play a very important role to support the life activities of the communities. One of the rivers in West Java – Indonesia is Cipunagara River, which supports the biggest catchment in Subang Regency, West Java. Past research has shown that growing activities in the catchment area of the river has caused the quality deterioration of Cipunagara River. The importance of the river is multiplied because the river will also be used as the source of water for Sadawarna and Cilame Reservoirs. This paper aims at analyzing the pollution load on Cipunagara River, for the water quality parameter of BOD, from various activities. The analysis was undertaken by selecting the most important segment of the river using several criteria. Once the segment was selected, both existing and projected pollution loads were calculated based on the guidance from the Ministry of Environment and Forestry of Indonesia. Results show that total pollution loads of BOD from livestock, domestic, agriculture and industrial sectors exceed the maximum pollution level in Cipunagara River. The calculated pollution load for BOD parameter is: 6,391.21 kg/d with the maximum pollution load (based on PP 82/2001 Kelas 1) is 2,355.26 kg/d. These results were then used as the inputs in the BOD Model simulations to analyze possible strategies in improving the quality of Cipunagara River.