bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the identification of a nonlinear term in a reaction–diffusion equation
Authors: Kaltenbacher Barbara , Rundell William 
Published: June 2019

AbstractReaction–diffusion equations are one of the most common partial differential equations used to model physical phenomena. They arise as the combination of two physical processes: a driving forcethat depends on the state variableuand a diffusive mechanism that spreads this effect over a spatial domain. The canonical form is. Application areas include chemical processes, heat flow models and population dynamics. As part of model building, assumptions are made about the form of, and these inevitably contain various physical constants. The direct or forward problem for such equations is now very well developed and understood, especially when the diffusive mechanism is governed by Brownian motion resulting in an equation of parabolic type.However, our interest lies in the inverse problem of recovering the reaction termnot just at the level of determining a few parameters in a known functional form, but in recovering the complete functional form itself. To achieve this we set up the standard paradigm for the parabolic equation whereuis subject to both given initial and boundary data; then we prescribe overposed data consisting of the solution at a later timeT. For example, in the case of a population model this amounts to census data at a fixed time. Our approach will be two-fold. First we will transform the inverse problem into an equivalent nonlinear mapping from which we seek a fixed point. We will be able to prove important features of this map such as a self-mapping property and give conditions under which it is contractive. Second, we consider the direct map fromf  through the partial differential operator to the overposed data. We will investigate Newton schemes for this case.Classical, Brownian motion diffusion is not the only version, and in recent decades various anomalous processes have been used to generalize this case. Amongst the most popular is one that replaces the standard time derivative by a subdiffusion process based on a fractional derivative of order. We will also include this model in our analysis. The final section of the paper will show numerical reconstructions that demonstrate the viability of the suggested approaches. This will also include the dependence of the inverse problem on bothTand.
Quasiparticle interference and symmetry of superconducting order parameter in strongly electron-doped iron-based superconductors
Authors: Böker Jakob , Volkov Pavel A , Hirschfeld P J , Eremin Ilya 
Published: June 2019

Abstract
Motivated by recent experimental reports of significant spin–orbit coupling (SOC) and a sign-changing order-parameter in the Li1−x
Fe
x
(OHFe)1−y
Zn
y
Se superconductor with only electron pockets present, we study the possible Cooper-pairing symmetries and their quasiparticle interference (QPI) signatures. We find that each of the resulting states—s-wave, d-wave and helical p-wave—can have a fully gapped density of states consistent with angle-resolved photoemission spectroscopy experiments and, due to SOC, are a mixture of spin singlet and triplet components leading to intra- and inter-band features in the QPI signal. Analyzing predicted QPI patterns we find that only the spin-triplet dominated even parity A
1g
(s-wave) and B
2g
(d-wave) pairing states are consistent with the experimental data. Additionally, we show that these states can indeed be realized in a microscopic model with atomic-like interactions and study their possible signatures in spin-resolved STM experiments.
Quantum cluster approach to the topological invariants in correlated Chern insulators
Authors: Gu Zhao-Long , Li Kai , Li Jian-Xin 
Published: June 2019

Abstract
We detect the topological properties of Chern insulators with strong Coulomb interactions by use of cluster perturbation theory and variational cluster approach. The common scheme in previous studies only involves the calculation of the interacting bulk Chern number within the natural-unit cell by means of the so-called topological Hamiltonian. With close investigations on a prototype model, the half-filled Haldane Hubbard model, which is subject to both periodic and open boundary conditions, we uncover the unexpected failure of this scheme due to the explicit breaking of the translation symmetry. Instead, we assert that the faithful interacting bulk Chern number in the framework of quantum cluster approaches can be computed in the enlarged unit cell, which is free of the fault caused by the explicit translation symmetry breaking and consistent with the interacting bulk-edge correspondence.
Search for decay modes of heavy and superheavy nuclei *
Authors: Soylu A. 
Published: June 2019

Abstract
Spontaneous fission (SF) with a new formula based on a liquid drop model is proposed and used in the calculation of the SF half-lives of heavy and superheavy nuclei (Z= 90–120). The predicted half-lives are in agreement with the experimental SF half-lives. The half-lives of

decay (AD) for the same nuclei are obtained by using the Wentzel-Kramers-Brillouin (WKB) method together with Bohr-Sommerfeld (BS) quantization condition considering the isospin-dependent effects for the cosh potential. The decay modes and branching ratios of superheavy nuclei (Z= 104-118) with experimental decay modes are obtained, and the modes are compared with the experimental ones and with the predictions found in the literature. Although some nuclei have predicted decay modes that are different from their experimental decay modes, decay modes same as the experimental ones are predicted for many nuclei. The SF and AD half-lives, branching ratios, and decay modes are obtained for superheavy nuclei (Z= 119–120) with unknown decay modes and compared with the predictions obtained in a previous study. The present results provide useful information for future experimental studies performed on both the AD and SF of superheavy nuclei.
The prospects of using gravitational waves for constraining the anisotropy of the Universe *
Authors: Zhao Zhi-Chao , Lin Hai-Nan , Chang Zhe 
Published: June 2019

Abstract
The observation of GW150914 gave a new independent measurement of the luminosity distance of a gravitational wave event. In this paper, we constrain the anisotropy of the Universe by using gravitational wave events. We simulate hundreds of events of binary neutron star merger that may be observed by the Einstein Telescope. Full simulation of the production process of gravitational wave data is employed. We find that 200 binary neutron star merging events with the redshift in (0,1) observed by the Einstein Telescope may constrain the anisotropy with an accuracy comparable to that from the Union2.1 supernovae. This result shows that gravitational waves can be a powerful tool for investigating cosmological anisotropy.
Tensile properties of coir and fleece fibers reinforced poly-lactic acid hybrid green composites
Authors: Musyarofah L , Puspita D , Hidayah E , Sujito  
Published: June 2019

Abstract
Hybrid green composite is a combination of several layers of fiber types or laminate that are arranged with a certain number and sequence. This type is used to replace the deficiencies of both types of fibers and can combine the advantages. In this paper, tensile properties of hybrid green composite biodegradable from natural fibers (coir and fleece) and Poly-Lactic Acid (PLA)matrix were investigated. The synthesis of composite material was carried out with five samples i.e coir, fleece, 5/15% mass of coir and fleece, 10/10% mass of coir and fleece and 15/5% mass of coir and fleece reinforced PLA biodegradable matrix were synthesized using hot press molding at temperature of 170°C pressure of 10MPa and time molding of 10 minutes. Characterization of tensile strength and modulus of elasticity of the material using the Tensile Test Machine ASTM D 638. The result show that the tensile properties (tensile strength and modulus of elasticity) of the sample affected by addition of fiber fraction. The result confirmed with the result of morphology test by SEM (Scanning Electron Microscope).
Characterization and effect of atmospheric corona plasma on grey knit polyester fabric
Authors: Muhlisin Z , Hasan S N , Rizki U N , Tajibnafis A S , Arianto F 
Published: June 2019

Abstract
The use of chemical compounds in dyeing is still dominant. This results in the redundant use of water for the washing. Therefore, there needs to be a research on an alternative method. This research is aimed at understanding the effect of both positive and negative corona plasma irradiations on fabric. It is expected that characteristics of voltage, current, and electrode spacing, as well as ion mobility from the corona plasma will be known, both for with and without grey polyester knit fabric. Other than that, dampness characteristics of the grey polyester knit fabric will also be known. Plasma discharge is generated using point-plane electrode configuration connected to a high voltage DC power supply. The number of point electrodes is 100. Meanwhile, irradiation on the fabric is performed by putting the grey polyester knit on top of the plane electrode. Characterization was then carried out by varying the voltage, spacing of both point and plane electrodes, with and without the fabric. Other than that, variation was also made for the duration of grey polyester knit fabric irradiation. The next step was water drop test to observe 1 mL water absorption on the grey polyester knit. Results show that adding potential difference increases the current of corona spark plasma discharge for both positive and negative current corona discharges. The same case was also observed when the plasma discharge was irradiated on the plane electrode, either with or without the grey polyester knit fabric. The presence of grey polyester knit altered discharge mobility in that the small spacing of the fabric increases mobility for both negative and positive corona discharge. Hence, the further the electrodes spacing, the less mobile charge particles become. Results of water drop test show that longer irradiation on the fabric speeds up water absorption in the grey polyester knit fabric, both for positive and negative corona irradiations.
The modeling of 80 mm diameter cross flow turbine runner for mini/microhydro environmentally friendly power plant
Authors: Purwanto  , Budiyono  , Hermawan  
Published: June 2019

Abstract
Indonesian river’s potentials on Mini or Microhydro fuelled power plants has not been maximally explored despite its big potentials of utilization. The 500 MW energy potentials of Mini or Microhydro throughout Indonesia have only reached the point of 4.5% while National Energy Management Blueprint in 2050 targeted 31% of renewable energy (RE) is coming from Micro hydro energy. The applications of 80 mm diameter cross flow turbine in a household scale have drawn an increase in its experience with 450 Watts of power produced through small discharge of 20 liters/second and 3-meter head. Cross flow turbines testing in 130 mm length and 80 mm diameter conducted using Mini / micro hydropower Plant in environmentally friendly power House drum. Lower investment and operational design cost also to be made on its aim to reach community group or individual segments.
Analysis of calcium element in concrete using laser-induced breakdown spectroscopy
Authors: Hartadi B S , Khumaeni A 
Published: June 2019

Abstract
One of the spectroscopy method, which can determine constituent in material, is Laser-Induced Breakdown Spectroscopy (LIBS). LIBS is an atomic emission method that uses radiation pulses from the high energy laser. LIBS allows the detection of spectral lines of elements present in the excited sample. In this present research, a pulse Nd: YAG laser with 1064 nm wavelength was used in LIBS system to the analysis of concrete elements. Spectrum analysis of calcium element in concrete was performed to understand the characteristics of generated laser plasma. Characteristics of laser plasma were shown through energy and pulse repetition rate laser variations. Using the higher energy laser, the larger plasma diameter was made. Furthermore, the graphs show increment in intensity and peaks, which have better sharpness. The laser repetition rate does not affect the size of the plasma, but the greater frequency of laser shots cause the lower emission intensity.
DDBD ozone plasma reactor generation: the proper dose for medical applications
Authors: Azam M , Restiwijaya M , Zain A Z , Sumariyah S. , Setiawati E , Richardina V , Hendrini A R , Dayana B , Kinandana A W , Arianto F , Bintang K N , Putri Y , Valas Y K , Nur M 
Published: June 2019

Abstract
Double Dielectric Barrier Discharge (DDBD) ozone plasma reactor generation are presented in this paper. The generation of this reactor generates ozone concentration which can be arranged upon the proper dose for medical applications. AC high voltage is applied to the range of 0-3 kV and the frequency of 50 Hz. Pure oxygen gas was piped into the DDBD reactor with flow rate variations of 2, 4 and 6 L/min. The results showed that current as a function of voltage where the current is increased with the increasing of voltage. Ozone productivity is shown by the significant increase of current. Ozone concentration is increasing as the increase of the voltage provided, but rather the concentration of ozone is decreasing as the increasing of flow rate. The Ozone capacity is affected by ozone concentration and flow rate, and can be used to determine the ozone dose. The proper dose of ozone can be ozone therapy for various kinds of diseases.
Richardson number model for turbulence motion analysis around airport runway
Authors: Gernowo R , Saputro H D , Setiawan A , Adi K , Widodo A P 
Published: June 2019

Abstract
Natural disasters now often occur in Indonesia, especially regarding atmospheric anomalies. The models of forecasting based convective cloud growth events are necessary to understand the anomaly symptoms of the atmosphere. This research solves a problem, we propose a method that can analyze the convective cloud with Weather Research and Forecasting (WRF) model. The potential of turbulence then needed turbulence index like Richardson Number (Ri). The Richardson Number Index (Ri) takes into account the value of Vertical Wind Shear and the stability of the air. This causes Ri to be considered ideal for describing Clear Air Turbulence (CAT). In this study, the negative Ri results tend to experience mild turbulence due to atmospheric conditions with Ri < 0.25 has a great chance of turbulence.
Analysis of noise levels caused by various types of trains
Authors: Margiantono A 
Published: June 2019

Abstract
A passing train is a source of the noise. Noisy is an unwanted sound from a business or activity at a certain level and time that can cause public health problems and environmental comfort. Noise is one of the problems for environmental health. According to the World Health Organization (WHO), in 2000 there were 250 million (4.2%) of the world population experiencing hearing loss due to noise and around 140 million (50%) were in Asia. A passing train is a source of the noise. In this study the measurement of daytime noise level (Lsm) and momentary noise level (Lek) at several points along the Cirebon-Cepu railway. The daytime noise level (Lsm) is measured for 24 hours for each point while the instantaneous noise level is measured from 5 meters, 10 meters, 15 meters and 20 meters from the rail. Noise level at night (Lsm) and momentary noise level (Lek) which is measured is the noise level caused by various types of trains that are passing. From the research that has been done, the noise level in some places has exceeded the Threshold Value. The highest noise level of Nighttime at Cirebon Prujakan Station is 78 dBA for Special areas, while the biggest increase in momentary noise is caused by a freight train of 30 dBA in Pulosaren Settlement.
3D Gravity Data Modelling for Determining a Subsurface structure of The SDP Geothermal Field
Authors: Meilasandi T , Sugianto A , Indriana R D , Harmoko U 
Published: June 2019

Abstract
The SDP geothermal research area geographically located in eastern Indonesia where there are geothermal manifestations of hot springs. 3D modeling and vertical-horizontal gradient analysis are used to determine the presence of subsurface structures of the study area. Separation of complete Bouguer anomaly data to obtain regional and residual anomalies has been done by upward continuation. The results of the horizontal and vertical gradients indicate that the presence of the geothermal manifestation of MAP 1 hot spring is controlled by the presence of trending northwest-to-southeast fault. We interpret the emergence of manifestations due to the presence of a permeable zone in the form of the fault structure. 3D modeling shows the existence of alluvium sediment, sedimentary rocks, limestones, ultrabasas (peridotite), granite, metagranite, gneiss and the presence of trending northwest trending to the southeast fault.
Identification of the geological structure on the NPR Geothermal Area based on 3D Modeling Gravity Data
Authors: Rizaldi N P , Dewi R , Indriana R D , Harmoko U 
Published: June 2019

Abstract
This research does to know the geological structure of the NPR geothermal area. We applied a gradient analysis and 3D modelling of gravity data based on bouguer anomaly, the additional method of euler deconvolution analysis to estimate the depth of the geological structure. The data consist of 325 points which was measured by PSDMBP team, Bandung. Based on the the result of horizontal gradien which is located at the maximum value and controlled by of vertical derivative which is located is at zero, we interpret that the appearance of a goethermal manifestation such as fumarole and hot spring controlled by the presence of fault. The average depth fault of Euler Deconvolution is < 288.5 meters to >480.2 meters. 3D modelling results indicates volcanic breksi stone, lava andesitand tuff and the presence of fault with some changing significantly rocks densities in the southwest and northwest to southeast research area.
Membrane technology in air pollution control: prospect and challenge
Authors: Komaladewi A.A.I.A.S. , Aryanti P.T.P. , Subagia I D.G.A. , Wenten I G. 
Published: June 2019

Abstract
Rapid growth in environmental awareness raised the strict regulations on air pollution control and led to great developments in air filtration or cleaning technologies. The membrane is one of the promising technologies for air filtration due to its high efficiency, low cost, and easy to scale-up. Two types of air filtration membranes have been used to provide high efficiencies in contaminant removal, namely electro-spun fibrous and microporous polymeric membranes. The fibrous membranes composed of randomly oriented fibers, either micro-or nano-fiber, and have been widely used to remove fine particles, such as aerosols. Meanwhile, the microporous membranes have a pore size that can remove both particulate and molecular, such as toxic gases. This paper reviews the role of membrane technologies in air pollution control. The performances of the membranes are presented comprehensively. Besides, the developments of the membranes to improve the filtration efficiency and reduce air-flow resistance are also discussed.
Nutrition Measurement of “Grombyang” – unique dishes of Pemalang, Central Java Province, Indonesia
Authors: Saraswati L D , Arifan F , Muhammad F , Yuliana RAD , Nissa C 
Published: June 2019

Abstract
Grombyang is one of the typical food from Pemalang Central Java which sold freshly in restaurant or food stall. To marketed commercially outside Pemalang, several parts of grombyang seasoning was made in instant form. The study aimed to analyze the content of nutrients (protein, and fat), and rancidity test contained in each grombyang seasoning which is dry galangal, fried onion, coconut srundeng, a mix of tauco, kluwek and palm sugar. Another aim was to analyze the number of bacteria in grombyang seasoning. The protein test used Kjeldahl method, and fat test used Soxhletasi method. While the bacteria test using Total Plate Number (ALT) method of bacteria and rancidity test using Thio Barbiturate Acid (TBA) method. The results showed that the protein content of each spice component such as srundeng coconut grombyang was 10.8%, petis 12.4%, fried onion 25.9%, palm sugar (aren) 12.3%. Fat content in spice component of grombyang for srundeng kelapa grombyang 41.2%, 50.7%, petis 12.3%, fried onion 24.9%, aren 51.5%. Total Plate Count Test (ALT) of the bacteria showed that total bacteria found in spice grombyang was 12.1 × 105 CFU/ml. It can be concluded that the highest protein content found in fried onions and the highest fat content found in palm sugar. Also, spice Grombyang had the number of microbes that were in the standard range of BPOM No. 16 of 2016 (10 × 108 - 10 × 109 CFU/ml).
Nutrition Analysis of "Ogel-ogel" –typical snack originally from Pemalang, Central Java Province, Indonesia
Authors: Saraswati L D , Arifan F , Muhammad F , Arumavriante D , Nissa C 
Published: June 2019

Abstract

Ogel-ogel is a unique food in Pemalang with a crispy textured within a distinctive cheese flavor. Ogel-ogel made from glutinous rice flour mixed with egg, cheese, sugar, and salt. Then the dough is printed like a caterpillar writhing using a special tool and then fried. The study aimed to examine the nutrition content and the total amount of bacteria inogel-ogel. The test included nutritional content test such as carbohydrate content test used luff schrooll method, protein used kjehdahl method, fat used sokletasi method, rancid used TBA (Thiobarbituric Acid) method with interval 5 days for 20 days, microbiology test used ALT method (Total Plate Count) with PCA media (Plate Count Agar), free fatty acid test by titration method used NaOH. The test results showed that ogel-ogelcontain carbohydrate equal to 11.1%, protein 13%, fat 47%, (the result of rancidity), amount of bacteria as much as 1.13 × 104 CFU/ml, and free fatty acid test result. Based on the test, it can be concluded that Ogel-ogel is safe to be consumed because it is in the standard range of BPOM No. 16 of 2016 which is in the range 107-108 CFU/ml for the category of typical bakery products (sweet, salty and savory).
Identification and determination of phenolic acids content in mango “golek” leaves ethanol extract
Authors: Khasan A , Fachriyah E , Kusrini D 
Published: June 2019

AbstractEthanol extract from mango “golek” leaves (Mangifera indica L) was obtained by maceration in ethanol 96%. Phenolic acid was isolated from the extract by hydrolysis with and without a hydrolyzing agent (TH). Two different hydrolyzing agents were used separately, i.e., sulfuric acid (HA) and sodium hydroxide (HB). Identification of phenolic acid was made with TLC and High-performance liquid chromatography (HPLC). Determination of phenolic acid content was carried out using TLC Scanner. Standard phenolic acid was used as a control. Phenolic acid compounds were obtained in the HA, HB and TH isolate namely gallic acid. The total gallic acid content was 35.88% consisting of HA, HB and TH fraction of 3.46%; 12.42%; 19.98%.