bluuebunny/crossref_metadata_2025_split huggingface dataset:
Initiation of Richtmyer–Meshkov instability by a detonation wave
Authors: Kashkovsky A V , Kratova Yu V , Shershnev A A 
Published: December 2019

Abstract
As part of the HyCFS-R numerical code development, a module for the simulation of multiphase chemically reacting flows based on the Euler–Euler approach was implemented. The code was verified on simple 0D and 1D problems, such as constant volume explosion and 1D shock tube problem. For more comprehensive testing the numerical simulation of the Richtmyer–Meshkov instability in reactive heterogeneous media was performed. The comparison against the reference solution revealed that numerical method implemented in the HyCFS-R either introduce too much dissipation and suppress the detonation wave front instabilities or lead to numerical artifacts in the Richtmyer–Meshkov instability flow pattern.
Calculation of continuous spin detonation of a hydrogen-oxygen mixture in an annular combustor with oxygen ejection
Authors: Simonov E V , Zhdan S A 
Published: December 2019

Abstract
A closed mathematical model of continuous spin detonation in a H2-O2 mixture with oxygen ejection from the environment has been developed. The model takes into account the inverse effect of pulsation processes in the combustor on oxygen ejection. A numerical study was performed for a 10 cm diameter ramjet annular combustor with geometric dimensions corresponding to experiments. One-wave modes of continuous spin detonation were calculated and the flow structure was analyzed with variation in the specific hydrogen flow rate from 3 to 3.75 kg/(s·m2). Decreasing the flow rate of ejected hydrogen during continuous detonation in the combustor is found to lead to a monotonic decrease in the detonation velocity, wave front height, average static pressure, and equivalence ratio, but to an increase in the oxygen ejection coefficient. The results are validated against experimental data.
Shock wave and detonation flow regimes in gas suspension of reacting gases and inert particles
Authors: Tropin D A , Bochenkov E S 
Published: December 2019

Abstract
In this research, the interaction of shock waves (SW) with clouds of chemically inert solid particles of silica with a diameter of 100 μm in a hydrogen-air mixture is considered. Depending on the initial volume concentration of particles, three shock wave and detonation flow regimes are realized: 1. attenuation of the SW by a cloud of inert particles, 2. initiation of detonation behind the front of the SW reflected from the rigid wall, 3. initiation of detonation in a cloud of inert particles.
The correlation of the pulsations of flow in the settling chamber with the pulsations of supersonic flow
Authors: Afanasev L V , Kocharin V L , Yatskikh A A , Kosinov A D , Semionov N V , Yermolaev Yu G , Kolosov G L 
Published: December 2019

Abstract
The relationship of the pulsations of flow in the settling chamber with the pulsations of supersonic flow in the test section of the T-325 wind tunnel of ITAM SB RAS was investigated. Experimental data on the correlation between flow pulsations in different sections of wind tunnel and efficiency of turbulence reducing system were obtained. The system of three-channel hot-wire measurements in subsonic and supersonic flows was tested.
Correction of inertance of temperature sensing devices in high-speed flow
Authors: Goldfeld M A , Pickalov V V 
Published: December 2019

Abstract
The influence of the thermocouple calibration method on the reconstruction of the real temperature in impulse wind tunnel with operation duration of up to 100 ms is presented. It is shown that in an impulse set-up allow obtaining a stepwise thermal load with long temperature plateau which enough to determination of instrumental function, necessary for temperature reconstruction. To this aim, the developed technique, based on the application of the solution of the convolution integral equation, was used. It was included the information on the instrumental function, which was obtained from the calibration measurements. In the deconvolution procedure, the signal was first smoothed by splines, the convolution kernel was extracted by the differentiation of smoothed function, and regularization was performed by Kaczmarz algorithm with relaxation parameter. A comparison is made of the temperature reconstruction in the regular mode of hot shot wind tunnel with two different methods for measuring the response of thermocouples to the temperature step: measurement behind the shock wave front and rapid immersion in aluminum melt. It is found that the use of the instrumental function obtained in a wind tunnel allows one to more reliably determine the position of the temperature maximum in real experiment, which corresponds to the physical structure of the flow.
Low-frequency waves produced by a package of laser plasma clouds in a magnetized background
Authors: Tishchenko V N , Berezutsky A G , Boyarintsev E L , Zakharov Yu P , Miroshnichenko I B , Posukh V G , Ponomarenko A G , Chibranov A A , Shaikhislamov I F 
Published: December 2019

Abstract
It was shown for the first time that in a laboratory experiment a train of laser plasma clouds makes it possible to increase the length of the whistler waves generated in the power tube of a magnetized medium. The intensity of waves is orders of magnitude higher than the level achieved by known methods.
Effect of side walls on the supersonic ramp flow structure
Authors: Trubitsyna L P , Zapryagaev V I , Kavun I N 
Published: December 2019

Abstract
The reattachment zone structure of a supersonic separated ramp flow was experimentally studied at M∞ = 6. Several ramp model configurations with and without side walls were considered. It was found that the geometric size of streamwise vortices in the reattachment zone increases due to the absence of transverse flow in the separation region. Moreover, flow separation regions were detected on the model side walls which interact with the ramp-induced separation region, forming corner vortex structures.
Ballistic facility for heavy bodies acceleration
Authors: Zvegintsev V I , Melnikov A Yu 
Published: December 2019

Abstract
This paper discusses the issues of creating a ballistic facility for use in laboratory conditions and achieving throwing speeds of up to 2000 m/s for massive objects. The design of the facility was proposed and the results of the analytical calculation of the achieved speeds were presented. The verification of the analytical calculation and the results of experiments on the prototype ballistic facility was done.
Numerical simulation of jet flows in homogeneous and heterogeneous media
Authors: Shevchenko A K , Strijhak S V , Yakovenko S N 
Published: December 2019

Abstract
Submerged jets at different Reynolds numbers (Re) with random perturbations added to the inlet velocity profile are simulated numerically by solving the Navier–Stokes equations. The effects of Re on flow behavior and the length of laminar jet region are studied. A natural gas jet flow emitting form the sea bottom is also simulated using the URANS and VOF methods, and forces acting on an object placed within the multiphase jet are evaluated.
Numerical analysis of flow structure behind a bluff body under conditions of unstable thermal stratification
Authors: Valger S A , Fedorova N N 
Published: December 2019

Abstract
In the paper, the authors describe some results of a numerical simulation of the air flow around a bluff body mounted on a flat plate taking into account the injection of a tracer gas through a hole located in the substrate behind the body. The aim of this paper is to describe flow structure in the vicinity of a prism taking into account unstable stratification of the boundary layer which is characterized by a negative vertical temperature gradient. The results of numerical simulation for an unstable thermal state were compared with those obtained for the case of stable stratification for the same geometry configuration.
Supersonic airplane engine jet influence on the intensity of tail shock wave of sonic boom waveform
Authors: Volkov V F 
Published: December 2019

Abstract
The paper presents the computational experiment results aimed at studying the influence of the aircraft propulsion system on the sonic boom parameters. As a result, at large distances from the disturbances source at jet temperature of 2400° K and velocity of 1700 m/s at the nozzle exit, the trailing shock wave intensity in the sonic boom profile was significantly reduced by 50% compared to the profile generated by the aircraft without considering the jet influence.
Satellites reveal a small positive yield effect from conservation tillage across the US Corn Belt
Authors: Deines Jillian M , Wang Sherrie , Lobell David B 
Published: December 2019

Abstract
Conservation tillage is a primary tenet of conservation agriculture aimed at restoring and maintaining soil health for long-term crop productivity. Because soil degradation typically operates on century timescales, farmer adoption is influenced by near-term yield impacts and profitability. Although numerous localized field trials have examined the yield impacts of conservation tillage, their results are mixed and often unrepresentative of real-world conditions. Here, we applied a machine-learning causal inference approach to satellite-derived datasets of tillage practices and crop yields spanning the US Corn Belt from 2005 to 2017 to assess on-the-ground yield impacts at field-level resolution across thousands of fields. We found an average 3.3% and 0.74% yield increase for maize and soybeans, respectively, for fields with long-term conservation tillage. This effect was diminished in fields that only recently converted to conservation tillage. We also found significant variability in these effects, and we identified soil and weather characteristics that mediate the direction and magnitude of yield responses. This work supports soil conservation practices by demonstrating they can be used with minimal and typically positive yield impacts.
Greater stability of carbon capture in species-rich natural forests compared to species-poor plantations
Authors: Osuri Anand M , Gopal Abhishek , Raman T R Shankar , DeFries Ruth , Cook-Patton Susan C , Naeem Shahid 
Published: December 2019

Abstract
Tree plantations and forest restoration are leading strategies for enhancing terrestrial carbon (C) sequestration and mitigating climate change. While it is well established that species-rich natural forests offer superior C sequestering benefits relative to short-rotation commercial monoculture plantations, differences in rates of C capture and storage between longer-lived plantations (commercial or non-commercial) and natural forests remain unclear. Using a natural experiment in the Western Ghats of India, where late-20th century conservation laws prohibited timber extraction from monodominant plantations and natural forests within nature reserves, we assessed forests and plantations for aboveground C storage and the magnitude and temporal stability of rates of photosynthetic C capture (gross primary production). Specifically, we tested the hypothesis that species-rich forests show greater temporal stability of C capture, and are more resistant to drought, than monodominant plantations. Carbon stocks in monodominant teak (Tectona grandis) and Eucalyptus (Eucalyptus spp.) plantations were 30%–50% lower than in natural evergreen forests, but differed little from moist-deciduous forests. Plantations had 4%–9% higher average C capture rates (estimated using the Enhanced Vegetation Index–EVI) than natural forests during wet seasons, but up to 29% lower C capture during dry seasons across the 2000–18 period. In both seasons, the rate of C capture by plantations was less stable across years, and decreased more during drought years (i.e. lower resistance to drought), compared to forests. Thus, even as certain monodominant plantations could match natural forests for C capture and storage potential, plantations are unlikely to match the stability–and hence reliability–of C capture exhibited by forests, particularly in the face of increasing droughts and other climatic perturbations. Promoting natural forest regeneration and/or multi-species native tree plantations instead of plantation monocultures could therefore benefit climate change mitigation efforts, while offering valuable co-benefits for biodiversity conservation and other ecosystem services.
Simulation-based framework of bonus zoning to provide public space in Bandung city
Authors: Sugiana E , Hasan T S D , Zulkaidi D , Prilandita N 
Published: December 2019

Abstract
Bonus zoning is a zoning regulation tool that allows developers to get more density in exchange for public facilities improvement or provision. Bandung already has designated areas for Bonus Zoning within their Local By-law No.10/2015 on Detailed Spatial Plan and Zoning Regulation. This research aims to identify potential public space through zoning regulation tool along with the accompanying compensation. We simulate the formula of the provision of compensation on several areas in Bandung, within city/sub-city center and outside city/sub-city center. The compensation value is depending on land price and its location relative to the city center in the designated area. The average compensation in the city/sub-city center is higher compared to compensation outside the city/sub-city center. When applied correctly, bonus zoning can balance the intensive development and improved livability of its area.
Study on roadside greenery in Yogyakarta City towards development of productive urban landscape
Authors: Sarwadi A , Irwan S N R , Utami R N , Raya A B 
Published: December 2019

Abstract
Yogyakarta City has carried programs in developing green urban open spaces however those are still needed to be improved continuously. This paper aims to identify the type of trees in three roadside types. Field observations have been carried out in three types of road, i.e. secondary arterial road, secondary collector road, and local street. This paper also shows the identification of problems in developing a productive landscape of roadside greenery. Survey results were analyzed by descriptive statistics. 26 road samples were identified in relation to the tree species based on three road types. The survey results showed that secondary arterial roads consisted of 28.76% angsana trees (Pterocarpus indica) and 17.20% tanjung trees (Mimusops elengi). Secondary collector roads were dominated by tanjung trees (58.31%), and local streets consisted of 23.44% tanjung trees and 18.86% glodogan trees (Polyalthia longifolia). The survey also recognized that edible plants at roadside greenery were only 14.7%. Some problems were related to the trees such as inappropriate trees, less roadside space, less planting media, and less maintenance. 160 urban community also were interviewed. The interview results showed a lot of people disagreed to plant fruit trees at roadside greenery because of the unsafe feeling of fruit falling for walking at pedestrian under the trees and problems of intensive maintenance.
The aspect role of building maintenance on architectural design works (case study: a College Building in West Jakarta)
Authors: Rilatupa J 
Published: December 2019

Abstract
Architecture design needs to be completed with design criteria and standard knowledge of building maintenance in order to estimate a design quality related to shape and building materials selection. Similarly, a design criterion needs knowledge of building operations, including its maintenance aspects. Building maintenance needs to be done, in order to building lifetime can be extended by making periodic repairs, because utilization of each building component is not the same. Generally after building implementation, began to emerge problems with degradation in quality function of each component, utility and utilization of maintenance costs that were not proportional to the building lifetime. This research was conducted at one of the college buildings in Jakarta. This study aims to observe changes in building structures conditions, determine failure location, both in terms of architecture and maintenance; and an improvements inquiry that have been made to construction components. The method used based on BRE Digest 268. Based on an investigation obtained category value reliability and condition of college building is 86.9 with good treatment condition.
Comparative study of community-based composters, a case study in West Bandung Regency, West Java – Indonesia
Authors: Afifah N H , Juwana I , Satori M 
Published: December 2019

Abstract
Organic waste is the most dominant waste produced; the reduction of this type of waste has the potential to significantly reduce waste entering a landfill. Composter can reduce organic wastes at the source. This research aims to compare the performances of 3 types of aerobic composters available in Waste Bank Sahdu which are brick overlay, drum, and takakura. The types of wastes are used food and yard waste. The performance of each composter is determined by its capacity, performance, and the quality of composts produced. The capacity of a composter is obtained from the quantity of waste reduced. The performance a composter is assessed based on the composter’s ability to process organic waste into compost. The quality of compost is the result of laboratory test for the following parameters temperature, ratio C/N, water content, pH, zinc, copper. The results showed that the capacity of brick overlay, drum and Takakura are able to treat waste per day from 456, 210 and 20 households respectively. Their performances are able to treat 53.45%, 48.27% and 56.01% of organic waste into compost, respectively. The compost quality that produced by all composter has met the standard quality, except for pH of the drum. Based quality of compost produced from all composters is suitable for use. The Takakura included of individual composter, while brick overlay and drum included of communal composters.
Food security index and livelihood assets of Pandaan District, Pasuruan Regency, Indonesia
Authors: Prayitno G , Safitri N , Subagiyo A , Riska B 
Published: December 2019

Abstract
Food security is a situation that exists when everyone has physical, social and economic access to healthy, nutritious food that meets his/her dietary needs and dietary preferences, as well as active and healthy life. The data needed to measure the level of food security index are the availability of food, access to food, and the use of food. In addition to measuring the level of food security, this study also measured livelihood assets owned by the community. The data needed to measure the livelihood assets of the community are human assets, social assets, and economic assets. The method used in this research was descriptive quantitative with the result of the vulnerability index, CFA analysis (confirmation factor analysis) with the result of the subsistence asset building factors, and SEM analysis with the result of the relationship of latent variables between livelihood assets. The purpose of this study is to determine the level of food security, the factors that constitute livelihood assets, as well as the relationships between each component of livelihood assets. The results of the analysis showed that there are six villages in the food insecurity category. Livelihood assets in Pandaan consist of three assets, namely human assets (health, education, skills), social assets (relations between citizens and the intensity of conflicts) and economic assets (possession, savings, economic conditions and type of work). SEM’s results from Mplus analysis showed that each component of livelihood assets supports and maintains mutual relationships.
Role of land cover change to landslides susceptibility in agricultural catchment
Authors: Satriagasa M C , Suryatmojo H , Dewi H N 
Published: December 2019

Abstract
Physical and hydrometeorological properties of Karangkobar Catchment combine with poor land management cause landslide is commonly occurred in Karangkobar Catchment. This research is aiming to proof the role of land cover change to landslide susceptibility in Karangkobar Catchment. We use LULC change detection and landslide susceptibility analysis in this research. Main data use in this research is Landsat imagery from 1990 to 2018. LULC change detection is done using supervised classification to divide the land cover in the research area. Landslide susceptibility analysis was done using overlaying parameters then the landslide susceptibility analysis divides into 3 classes of susceptibility. Land cover in the research area tends to shift from agroforestry land to agricultural area or built up land. This affected the landslide susceptibility, it shifted from medium in 1990 to high susceptibility for almost 3 decades later. This analysis is proof of the role of the land cover change to landslide susceptibility in the research area. Furthermore, this phenomenon should be a warning to maintaining the land better and reducing the landslide susceptibility in the future.
Landslide risk assessment: human activities influence on an agriculture catchment
Authors: Dewi H N , Suryatmojo H , Ngadisih  , Satriagasa M C 
Published: December 2019

Abstract
A disaster is an event that can cause damage, loss of human life, or environmental damage. One of the disasters that often occurs in the upstream area is landslides. Karangkobar is one of the regions in the upstream area that had experienced a major landslide at 2014 which is resulted in 105 houses buried in land and 95 people were dead. The landslide disaster that has occurred in the Karangkobar catchment area is caused by the topography of the hills, high slopes, thick soil solum, soil texture is clay, cropping pattern and treated land that is inconsistent with conservation rules. This shows that landslide in the Karangkobar catchment area not only caused by natural conditions, but also human activities have an influence on the land. This research aimed to analyze the risk of landslide disaster based on hazard, vulnerability and capacity aspects in the Karangkobar catchment area. Assessment of risk analysis made by overlay between Hazard, Vulnerability, and Capacity is then given scores and weights. Overlay created with Arc Gis 10.4.1, scoring is given to assigning values to each parameter disaster. Weighting was analyzed by Analytical Hierarchy Process (AHP) with pairwise method and Expert Choice V.11 software, Weighting determined based on AHP scale. The result showed that the percentage of landslide risk based on human activity in the Karangkobar catchment are 41,16 % high risk, 38,04 % medium risk, and 14,47% low risk.
Identification of Pest and Disease in The Plant Conservation Center - Bogor Botanical Garden (PKT-KRB) Ecological Park Cibinong, Bogor, West Java, Indonesia
Authors: Muttaqin Z , Hartantri H , Meiganati K B , Hidayat I 
Published: December 2019

Abstract
The purpose of this study were: (1) to determine the pests and diseases infestation of plants in the Plant Conservation Center - Bogor Botanical Garden (PKT-KRB) Ecological Park area in Cibonong, Bogor Regency, (2) to determine the extent of damage that has been attacked by the pests and diseases. Sampling method was made by creating sample plots of 20m x 50m size with sampling intensity of 10% in the selected area at bioregion of Sumatera and of Kalimantan. The result of study showed that plants damage in those areas were dominated by hollow leaves caused by caterpillar pests i.e. at bioregion of Sumatera (37,84%) and of Kalimantan (40,23%). In addition, it was found that the secondly dominated infestation was alga leaf spot (Cephaleuro virescens) that has caused spots on leaf. Infestation intensity of the disease was of 35,14% at bioregion of Sumatra and of 28.74% at of Kalimantan, while the intensity of plants damage at bioregion of both were 36.00% and 42.44%, respectively. The scale of damage in both bioregions was included as score 2, which was the mediun category (⩾26-50%).