bluuebunny/crossref_metadata_2025_split huggingface dataset:
Diversity and activity pattern of wild cats in Way Kambas National Park, Sumatra, Indonesia
Authors: Subagyo A , Supriatna J , Andayani N , Mardiastuti A , Sunarto  
Published: April 2020

Abstract
Camera trapping was applied for assess the diversity and activity pattern of wild cats in Way Kambas National Park on May 2013 to May 2014. Fifty-seven cameras were systematically set within 480 km2 area covering a total of 4,610 trap nights. Of 4,017 recorded videos, four wild cats species were capture and identified, those are sumateran tiger (Pathera tigris sumatrae), clouded leopard (Neofelis diardi), leopard cat (Pardofelis marmorota) and marbled cat (Prionailurus bengalensis). The highest capture rate (video per 100 trap nights) was sumatran tiger and leopard cat (0.87) followed by marbled cat (0.11) and clouded leopard (0.09). Sumatran tiger and marbled cat were cathemeral. Sumatran tiger was found active during both day (51.6 %) and night (48.4 %) with its highest activity was between 05.00 – 06.00 hours and 05.00 – 06.00 hours, whilst marbled cat was active during the day (41.2 %) and night (58.8 %) with it highest activity found between 12.00 to 02.00 hours and 05.00 – 06.00 hours. The other two cat species, leopard cat and marbled cat were mostly nocturnal with the highest activity recorded at 05.00 – 06.00 hours and 21.00 – 22.00 hours for clouded leopard and 05.00 – 06.00 hours for leopard cat. Our study demonstrates that the Way Kambas National Park is an important habitat for wild cats in Sumatra, although the presence of other rarer cat species in the park, such as golden cat and flat-headed cat still needs to be confirmed by further long-term monitoring study.
Using environmental DNA from sediment samples to detect invasive alligator gar (Atractosteus spatula) in an artificial pond
Authors: Azis M , Andayani N , Maryanto A E 
Published: April 2020

Abstract
The early detection and assessment of aquatic species distribution is important in studying conservation and management. However, due to high costs and ineffective conventional methods, this is difficult in developing regions. Molecular genetic studies have led to advanced technology to allow researchers to monitor the presence of trace DNA levels found in the environment. In this study, we show that sediment can be used as an environmental DNA sample to detect the presence of an invasive species, the Alligator gar (Atractosteus spatula). Samples were processed directly using the FastDNA Spin Kit for soil, followed by other downstream applications, including PCR and sequencing. Amplified DNA fragments and sequence analysis revealed successful identification of the Alligator gar. Despite the environmental conditions, which tend to be warmer than typical eDNA samples, the high DNA concentrations in sediment samples allowed the reliable detection of this invasive species.
Measles virus detection in urine specimens using virus culture and reverse transcriptase polymerase chain reaction (RT-PCR)
Authors: Sari T P , Subangkit  , Abinawanto  
Published: April 2020

Abstract
Measles is a highly prevalent infectious disease in Indonesia, and these large number of cases need to be confirmed in a laboratory so that precautions can be taken quickly and accurately. This study used urine specimens for laboratory confirmation of measles using viral culture and reverse transcriptase polymerase chain reaction (RT-PCR). Viral culture was performed using vero cells/hSLAM and its cytopathic effect was quantified, and RT-PCR was used to amplify the N gene fragment using measles virus forward primer (MeV216) and measles virus reverse primer (MeV214). We tested 120 urine specimens obtained from nine different provinces in Indonesia in 2016. Virus culture yielded a positivity value of 7 %, whereas RT-PCR positivity was 36 %. These results imply that the RT-PCR method is more sensitive for detecting measles virus compared with viral culture.
In vitro culture of Melastoma malabathricum (L.) from internodes on Murashige & Skoog (1962) modified medium supplemented with thidiazuron and 2,4-dichlorophenoxyacetic acid
Authors: Zakiyah N , Yuniati R , Handayani W 
Published: April 2020

Abstract

Melastoma malabathricum (L.) is a shrub that has potential uses in the fields of medicine and phytoremediation although further research on this species is warranted, including on its propagation, particularly in vitro culture. Here, research regarding the in vitro culture of M. malabathricum from internodes was conducted to determine its response on Murashige and Skoog (MS) modified medium supplemented with thidiazuron (TDZ) (1, 2, and 3 mg/L), 2,4-dichlorophenoxyacetic acid (2,4-D; 0.5 and 1 mg/L), or a combination of both. Our results showed that internodes responded by forming calluses on all treatment media except the medium supplemented with 0.5 mg/l 2,4-D and 3 mg/L TDZ. Compact calluses were formed upon supplementation with a single dose of TDZ (1, 2, and 3 mg/L) and a combination of growth regulators. Meanwhile, semi-compact calluses were formed upon supplementation with a single dose of 2,4-D (0.5 and 1 mg/L) and a combination of growth regulators. Generally, callus formation was observed on 5–19 days of culture. Internode explants cultured on medium supplemented with a single dose of 2,4-D showed optimal response, whereas those cultured on medium supplemented with the combination of TDZ and 2,4-D showed weak response.
Place exposure pattern toward landslide disaster due to heavy rainfall in Probolinggo District, East Java
Authors: Nanda R F , Sobirin  , Saraswati R 
Published: April 2020

Abstract
Landslide is the third largest disaster occurred in Indonesia, including in Probolinggo District. Analyzing the place exposure patterns toward landslide disaster due to heavy rainfall, which triggering the landslide in Probolinggo District is the purpose of this study. Daily rainfall data in 1990–2015 were used to obtain the frequency of heavy rainfall regions (> 50 mm/day, > 100 mm/three days and > 150mm/five days) using the interpolation method based on Thiessen Polygon. The potential landslide region was obtained by using SINMAP models, which was verified by the landslide location data from 2015 to 2016. Descriptive spatial analysis using the overlay technique showed that 50.30 % (85,358 Ha) area in Probolinggo District has the potential of the landslide, especially in Sub District Krucil, Andisol Soil region, the slopes of 15–40 % region, and the rainfall of 1500–2000 mm/year region. The place exposure patterns toward landslide disaster due to heavy rainfall in Probolinggo district is in the region which has the higher potential of landslides, and heavy rainfall frequency, the level of place exposure to landslides disaster due to heavy rainfall will be higher.
The potential of agricultural drought according to brightness and wetness index on Kebumen district
Authors: Rasjiddin A I , Sobirin S , Waryono T 
Published: April 2020

Abstract
Drought is a phenomenon resulting irrelevancy or climate in General as a lack of rainfall in the area. Droughts also impact on the surface layer of the soil where the moisture content required to balance organic matter, soil biota, as well as the survival of vegetation. Its categorized by NOAA as drought farms/land. This research is finding potentially soil drought spatially and measured trough index algorithm with wetness and brightness index made by Jensen in Chen (2014) in the District of Kebumen, to see the condition of the organic matter and soil moisture as well as indicators of soil drought by 2015, as well as linked with meteorological drought by the method of standardized precipitation index (SPI) (30 years of rainfall data) statistically. Both the index (wetness and brightness) are calculated on the data of satellite imagery. The results say rain-fed rice land, pasture and moorland is tend to drier that average on months (February, June and December 2015). Those land use become vulnerable to agricultural drought when dry season occur.
Citizen’s sense of place of Menteng subdistrict
Authors: Darmawati D R , Sumadio W 
Published: April 2020

Abstract
Menteng Subdistrict is one of the administrative areas located in the Central Jakarta City, DKI Jakarta Province. Formerly Menteng subdistrict was one of the places in Indonesia that has been developed and has a landscape characterized as a ‘garden city’. Along with the times of development, Menteng subdistrict has experienced changes in environmental characteristics particularly associated with the concept of garden city. The changes of environmental characteristics that experienced by Menteng subdistrict could further affect to the citizen’s sense of place. This research conducted to analyze the environmental characteristics pattern of Menteng subdistrict based on the citizen’s sense of place along with the environmental characteristic changes as garden city. Data collection was conducted through in-depth interviews with key informants and distribute questionnaires. All of collected data was categorized into several themes. Analysis process was done with discover keywords and themes from interview result, map interpretation, and also historical literature of Menteng subdistrict. Results of the analysis shows that based on the citizen’s sense of place, the whole area of Menteng Subdistrict now is no longer has an environmental characteristic as a garden city. Part of Menteng Subdistrict which still has remnants of environmental characteristics as garden city is at the southern region of that subdistrict. In conclusion, it is found that physically Menteng subdistrict has been changed much, except the southern region. Socially, the character of Menteng subdistrict has been changed.
Modelling the interaction of stations in the port railway junctions
Authors: Borodina E , Prokofieva E , Vakulenko S , Petrov A 
Published: April 2020

Abstract
The problem statement, qualitative analysis and main methodological approaches to the interaction of stations for the distribution of sorting and transfer work in port railway junctions with objects of railway infrastructure and rolling stock of various types are presented. The search for a solution provides for finding the optimal variant of interaction on the basis of combinatorial-optimization analysis using economic criteria, technical and technological parameters of stations and a plan of the formation of non-route gears in the area of pre-port transport hubs.
Obtaining and Research of Additive Products from Electroerosive Cobalt-Chrome Powders
Authors: Ageev E V , Altukhov A Yu , Ageeva E V 
Published: April 2020

Abstract
Based on the particularity of the methods of obtaining spherical shape powders in order to obtain spherical granules of a regulated grain size, the technology of electroerosive dispersion, which is distinguished by relatively low energy costs and ecological cleanliness of the process, is described. The widespread use of the method of EED for the processing of metal waste into powders for the purpose of their reuse and application in additive technologies is constrained by the lack of complete information in the scientific and technical literature about the influence of the original composition, modes and media on the properties of powders and technologies of practical application. Therefore, the development of technologies for the reuse of EED powders and the evaluation of the effectiveness of their use requires the conduct of comprehensive theoretical and experimental studies. The purpose of this work was to obtain and study additive products from electroerosive cobalt-chromium powders of a specific particle size distribution and to study their microstructure. The granulometry of the obtained powders was determined on a laser analyzer of particle sizes “Analysette 22 NanoTec”. The microstructure of additive samples from cobalt-chromium powders was investigated by optical microscopy on an inverted optical microscope OLYMPUS GX51. On the basis of completed studies, aimed at obtaining and studying additive products from electroerosive cobalt-chrome powders of a specific particle size distribution, and studying their microstructure, it was found that additive samples, obtained from a cobalt-chrome powder with an average particle size of 35.68 μm, have practically no pores.
Estimation of Stress-Deformed State of the Cutting Insert of a Disk Mill Using Computer-Aided Engineering
Authors: Shalamov V G , Smetanin S D , Boldyrev I S 
Published: April 2020

Abstract
The efficiency of the assembly tool is largely determined by the cutting tool insert installation scheme, as well as by the accuracy of manufacturing mating surfaces and loading conditions. When milling the normal types of destruction of the cutting blade are chipping and micro-dyeing. In this regard, in order to improve the reliability of a tool, it is desirable to provide the most uniform distribution of stresses at the initial time. In the article, the stressed-deformed condition of a cutting blade of a disk mill is considered taking into account the schemes of the cutting tool insert basing, the clamping force and the external cutting force. The stages of solving the problem of determining the stressed-deformed condition design of a disk mill are shown. The ratios of the force of clamping of the cutting tool insert and external force are determined. The joint effect on the stress state of the cutting tool insert of the clamping force and external force is analyzed.
Mathematical Modeling of the Electric Drive with Universal Power Semiconductor Converter
Authors: Dunaev M P , Arshinskiy L V 
Published: April 2020

Abstract
In the article are examined the mathematical models of the electric drive of direct and alternating current with the universal power semiconductor converter. The functional diagram of electrical power semiconductor converter is described. Are given the oscillograms of the output voltage of power semiconductor converter, obtained with the aid of the model of converter. Are determined the static and dynamic characteristics of the electric drive of direct and alternating current with the universal power semiconductor converter, which make it possible to positively estimate fitness for work and accuracy of the systems of electric drive in the steady-state and dynamic behaviors of work. The experimental studies, carried out in the laboratory mock-up of the electric drive of direct and alternating current with the universal power semiconductor converter, testify about the sufficiently high adequacy of the developed models and confirm the practical possibility of designing of the class of universal semiconductor converters for regulating the angular velocity of the electric motors of direct and alternating current.
Load Capacity of Spherical Roller Transmission with Double-Row Pinion
Authors: Lustenkov M E , Lustenkova E S 
Published: April 2020

Abstract
This paper provides an in-depth description of the design and operating principle of a spherical roller transmission producing a wide range of reduction ratios in small dimensions. The rotational motion is transmitted from the drive shaft to the driven shaft by a pinion with two coaxial rows of rollers. The pinion performs a spherical motion about a fixed point on the transmission axis with a constant nutation angle. The rollers are in contact with a fixed periodic closed groove formed by two cams mounted in the housing and a groove made on the cam of the driven shaft. Power is transmitted through a number of parallel flows, which increases the load capacity, i.e., the maximum torque in the driven shaft. The main criterion of reliability is the contact strength of the cam surfaces. Equations for calculating contact stress in the roller-groove contact on the cam of the driven shaft are obtained by use of the Hertz theory. A formula for calculating the maximum torque being transmitted, which is obtained from the kinetostatic equilibrium equations, is given. The analysis of the influence of the main geometric parameters of the transmission on its load capacity is presented.
Determination of Geometric Parameter of Cycloidal Transmission from Contact Strength Condition for Design of Heavy Loading Mechanisms
Authors: Efremenkov E A , Efremenkova S K , Dyussebayev I M 
Published: April 2020

Abstract
In the article, the contact strength condition is considered for transmission with intermediate rolling bodies. The components of contact strength condition equation are expressed through initial parameters of the transmission. The expression is obtained for determination the minimum permissible value of the geometric parameter r
c of transmission with IRBFIR. The expression can be used in preliminary engineering calculations of the hard loaded transmission.
Development of Energy Efficient Mechatronic Module for Alternative Energy
Authors: Shibinskiy K G , Efremenkov E A , Galin N E 
Published: April 2020

Abstract
The article describes the creation of mechatronic module for follow-up systems. In the mechanical part of the module the authors applied a reducer, which is based on cam coaxial radial flat transmission with intermediate rolling bodies. Transmission ratio is determined and equation of tooth profile is derived for the transmission. Transmission kinematics with different number of rolling bodies was also analyzed. Mechatronic module was designed to limit overall dimensions. The analysis of stress-strain state of the most loaded elements of the transmission is conducted. Structural diagram of mechatronic module is developed. Structure of optimal control of BLDC motor is presented as well as a function of minimizing the dependence on characteristics of a transition process of motor speed is selected. An adaptive PID controller is synthesized using genetic algorithm.
Analysis on the characteristics of pulsed electromagnetic force and the fluctuation behavior of molten metal free surface under pulsed magnetic field
Authors: Wu Xinjiang , Liu Ruirui , Gao Jianjun , Luo Jian , Geng Haibin 
Published: April 2020

Abstract
A self-made line laser liquid level measurement system was used to measure the fluctuation of molten metal free surface under pulsed magnetic field. The electromagnetic characteristics of pulsed electromagnetic force were mathematically analyzed. Results showed that the electromagnetic force presents oscillatory attenuation during a single pulse period. The electromagnetic force was composed of turning force

f

t
u
r
n

and non-turning force

f

n
o
n
t
u
r
n

.

The direction of

f

t
u
r
n

was always consistent with the melt circumferential direction, which turned the

f

n
o
n
t
u
r
n

consisted of electromagnetic pull and push forces, which caused the melt to oscillate. Under the pulsed magnetic field, the free surface formed a meniscus with a high middle, low side structure. With increased pulsed field intensity, the center surface of molten melt had an oscillation of ±3.52 mm at 0.187 T. The wave power density had only two spectral peaks (at 0.60 and 3.36 Hz) without a magnetic field. Under pulsed magnetic field, four spectral peaks were found at 0.40, 3.00, 6.50 and 13.00 Hz.
Topological carbon allotropes: knotted molecules, carbon-nano-chain, chainmails, and Hopfene
Authors: Saito Shinichi , Tomita Isao 
Published: April 2020

Abstract
Carbon allotropes such as diamond, nano-tube, Fullerene, and Graphene were discovered and revolutionised material sciences. These structures have unique translational and rotational symmetries, described by a crystallographic group theory, and the atoms are arranged at specific rigid positions in 3-dimensional (D) space. Regardless of these exotic molecular structures, the structures of materials are topologically trivial in a mathematical sense, that their bonds are connected without a link nor a knot. These days, the progress on the synthetic chemistry is significant to make various topologically non-trivial molecular structures. Topological molecules (0D) including Trefoil knots, a Hopf-link, a Möbius strip, and Borromean rings, were already realised. However, their potentially exotic electronic properties have not been sufficiently explored. Here, we propose a new 3D carbon allotrope, named Hopfene, which has periodic arrays of Hopf-links to knit horizontal Graphene sheets into vertical ones without connecting by σ bonds. We conducted an ab inito band structure calculation using a Density-Functional-Theory (DFT) for Hopfene, and found that it is well-described by a tight-binding model. We confirmed the original Dirac points of 2D Graphene were topologically protected upon the introduction of the Hopf links, and low-energy excitations are described by 1D, 2D, and 3D gapless Fermions.
Texture evolution of tungsten materials during recrystallization
Authors: Zhang Xiaoxin , Gong Zheng , Huang Jianjun , Yu Bin 
Published: April 2020

Abstract
Some functional and structural performance of tungsten (W) are related to its texture characteristics. Usually, W serves in high temperature and may undergo recrystallization. Thus it’s necessary to evaluate the recrystallization texture of W. In our previous studies, pure W (PW) and W-1.0wt%La2O3 (WL10) were deformed via unidirectional rolling (UNR), cross rolling (CRR) and clock rolling (CLR) with 80% reduction. In the present paper, PW-UNR, PW-CRR, PW-CLR and WL10-UNR were subjected to annealing at 2073 K for 2 h to achieve recrystallization and figure out the evolution mechanism of recrystallization texture in W materials. Besides, the effect of La2O3 on recrystallization texture of W was discussed. The results indicated that the fiber textures in rolling state were transformed into isolated textures after recrystallization. {001}〈uvw〉 isolated texture formed in the recrystallized W may be mainly resulted from the texture inheritance. {113}〈361〉 isolated texture formed in the recrystallized WL10-UNR may be attributed to the orientated growth of {113}〈361〉 grains with high grain boundary mobility facilitated by La2O3. Generally, isolated textures near θ-fiber were strengthened while γ-fiber was weakened for W during recrystallization, which is an effective method to achieve W with more {001} and less {111} textures.
Optimization on the synthesis of bacterial nano cellulose (BNC) from banana peel waste for water filter membrane applications
Authors: Sijabat Edwin K , Nuruddin Ahmad , Aditiawati Pingkan , Sunendar Purwasasmita Bambang 
Published: April 2020

Abstract
This research reports the optimization of the synthesis of bacterial nano cellulose (BNC) from banana peel waste media of Kepok bananas (Musa paradisiaca L.) using Gluconacetobacter xylinus bacteria in a fermentation process for use in water filter membrane applications. Bacterial nanocellulose (BNC) synthesis was successfully accomplished under conditions of pH 4, 0.5% urea, and varying sucrose contents (5%, 10% and 15% (w/v)). The higher sucrose content causes the pH of the banana peel extract solution to decrease at the end of Day 8 and 10 due to the metabolic activity of bacteria, which produces acetic acid. A bacterial growth pH range of 3.93–4.26 was obtained. The Optical Density (OD) values tend to increase with respect to fermentation time due to the growth of BNC-forming bacteria. The higher the added sucrose content, the higher the total amount of the acid obtained as the G. Xylinus bacteria produces acetic acid in its metabolic processes. BNC thickness is directly proportional to the increase in sucrose level but does not increase proportionally with the increase in sucrose levels from 5%, 10% (two times), and 15% (three times). The sucrose level at 5% (w/v) produces most optimal results. Optimal incubation time was obtained on Day 6, which had the highest rate of increase in thickness in addition to the supporting pH, OD value and total acid factors. The TEM analysis shows that the BNC surface morphology tends to be the same among all sucrose level (5%, 10% and 15% (w/v)). The difference can only be seen in the density of the nanocellulose. The nanocellulor nanofiber produced from banana peels has diameter sizes between 30–50 nm which potentially be used in water filter membrane application.