bluuebunny/crossref_metadata_2025_split huggingface dataset:
Survival and Reproductive Value of Hermetia illucens (Diptera: Stratiomyidae) on Vegetable and Fruits Waste Rearing Substrate
Authors: Julita U , Fitri L L , Putra R E , Permana A D 
Published: October 2019

Abstract

Hermetia illucens, black soldier fly has been a topic of interest in the ecological research world for many years especially in terms of its role as a bioconverter agent. Bioconversion process through black soldier fly represents a potential valuable solution to two problems: organic waste management on the one hand and on the other, the rising global demand for animal feed (transform organic waste into valuable animal feedstuff in the form of their last larval stage or prepupa). In this context, the aim of this study is to assess the survival and reproductive value of black soldier fly reared on vegetable and fruits waste. All treatments were constructed under laboratory conditions at 26±1°C temperature and 68%±0.5% relative humidity. The adult cage was placed near the window that allows sunlight to enter. Data were collected and analyzed based on an age-stage, two-sex life table. The intrinsic rates of increase (r) were 0.06877 and 0.05772 per days, finite rate of increase (λ) were 1.0712 and 1.0594 per days, net reproduction rate (R0) were 25.88 and 19.99 offspring, and mean generation time (T) were 46.403 and 50.00 days on vegetable and fruits waste, respectively. Our results demonstrated high mortality in the larval period that probably caused by high levels of water produced by vegetables and fruits waste during the experiments.
Constraints on Dark Energy Models in Cosmology from Double-Source Plane Strong Lensing System
Authors: Jaelani Anton T , A P Emas Ni Putu , Premadi Premana W , M Mulki Fargiza A 
Published: October 2019

Abstract
We performed an investigation of the possibility of constraining the dark energy models such as w-cold dark matter, holographic dark energy, and Ricci dark energy, using a special type of Einstein ring system, called as double-source plane (DSP) lensing system. We found that DSP lensing system only gives a good constraint of the model parameters. We also found that the method highly complimentary to cosmic microwave background measurement for each model.
Possibility of C/2002 CE10 in state of retrograde-polar resonance with Saturn in the future
Authors: Pangestu Ayu Dyah , Dermawan Budi 
Published: October 2019

Abstract
Many objects in the Solar System which are associated or in resonance state with the giant planets have low orbital inclination. The effect of resonance that occurs on high-inclination objects is not well-known. This study describes results of numerical studies in term of orbital evolution of a high inclination Halley-Type Comet C/2002 CE10 (LINEAR). The ephemeris data was taken from JPL Small Body Database (https://ssd.jpl.nasa.gov/sbdb_query.cgix) at the epoch of MJD 58200. We report that C/2002 CE10 (LINEAR), whose inclination is 145°, will be in a retrograde 1:-1 (co-orbital - trisectrix type) resonance with Saturn for about 600 thousand years in the future. This resonance state is examined using the method FAIR (Fast Identification of Mean Motion Resonance). C/2002 CE10 (LINEAR) exhibits chaotic orbits and may not be stable in the resonance state. While data quality of the provided orbital elements is not quite good, orbital evolutions of clones of C/2002 CE10 (LINEAR) show small possibility that the object will be in the resonance state (retrograde co-orbital) with Saturn in the future.
Three-Dimensional Modeling of Multiphase Fluid Flow With Linear Temperature Gradients In Porous Media Using Lattice Boltzmann Method Rothman-Keller
Authors: Pradana B , Fauzi U 
Published: October 2019

Abstract
In oil and gas production, only about 5% to 20% of hydrocarbons can be released through production wells with natural reservoir pressure. In the oil and gas industry, there is a method called enhanced oil recovery (EOR) to remove hydrocarbons trapped in rock pores. EOR is not easy and expensive, so fluid flow modeling and simulation are required to reduce the cost. In fluid modeling, there is a continuous approach using the Navier-Stokes (NS) equation. Not only the continuous approach, but fluid modeling also can be done by using Molecular Dynamics (MD) approach. Between these two methods, there is a method that bridging the advantages between the two. This method uses a macroscopic and microscopic approach (mesoscale) called Lattice Boltzmann Method (LBM). With this approach, the results obtained are quite accurate without the use of high computing devices. The LBM used in this research is the Rothman-Keller (RK) / color gradient method. This method assumes that the interaction force between two fluids is directly proportional to the two-fluid density ratio and has two collision operators, BGKW operator, and perturbation operator. This method is then subjected to pressure on the boundary region introduced by Zou-He. Then the temperature is given linearly and be used to calculate body force due to the temperature gradient. This study shows that the model that has been made is successfully simulating the flow of multiphase fluid in rock pores. In the model viscosity as a function of the temperature found that the average velocity of the fluid flow decreases when the temperature increase. In the temperature gradient model, when the temperature gradient increases, the average velocity, and saturation of the wetting fluid increases.
Tracing Galactic Arm with 6614 Å Diffuse Interstellar Band and Gaia DR2 Distances
Authors: Puspitarini L , Lallement R 
Published: October 2019

Abstract
Enigmatic problem in astronomical spectroscopy is diffuse interstellar bands (DIBs). DIBs are ∼ 500 weak and broad absorption features seen in the spectra of stars or other astronomical objects located behind interstellar materials. Despite the unknown ions or molecules that caused the absorptions, except for two near infrared DIBs, DIBs can be used as a potential interstellar medium (ISM) tracer to map Galactic structure. Gaia is a mission of the European Space Agency (ESA) which was launched on 2013. It provides precise distances which greatly improve our knowledge of the structure and history of our Galaxy. In this work, we used previously determined DIB equivalent width (EW) measurements by means of DIB fitting that is a combination of a synthetic stellar spectrum, a synthetic telluric transmission, and empirical DIB profile to the Gaia–ESO Large Public Spectroscopic Survey data. From DIB measurements from stellar spectra of distributed target stars and together with Gaia DR2 distances, we investigated the ISM distribution along particular line of sight, i.e., (l,b)∼(213°, -2°) which probes Local and Perseus Arm.
Measurement of The Night Sky Brightness in e-Maya Observatory
Authors: Harijadi Noor Laksmiyanti Annake , Herdiwijaya Dhani , Wibowo Ari 
Published: October 2019

Abstract
One of the ideal criteria for an observatory is the location that is related to its influence on the condition of the night sky. The observatory area is a light pollution-free area, far from the city or urban center. This is intended to get a dark night environment so the observations can be done well. The e-Maya Observatory is one of the observatories in Indonesia that located in Subang, West Java. Established in 2013, the observatory’s work is relatively new in Astronomy field in Indonesia. This observatory was built in the area of Astha Hannas Subang High School which is about 18 km to the north from the center of Subang city. To find out the quality of the night sky and how big the impact of city lighting or the level of light pollution in the e-Maya Observatory area, it is necessary to measure the brightness of the night sky. Measurement of the night sky brightness used a simple sky brightness photometer, Sky Quality Meter (SQM), there are two SQM types used, SQM LU and SQM LU-DL. SQM measures the brightness value of the night sky in magnitude per squared arcseconds (mag/arc sec2) all night on August 11-14, 2018 towards the east and west horizons with the slope angle of 30° (z = 60°) and pointed to zenith (z = 0°).
Primary Productivity of Blanakan Fishpond at Subang, West Java
Authors: Takarina Noverita Dian , Runtuwene Desi Octavia 
Published: October 2019

Abstract
Subang regency is one of the largest fisheries area in West Java, so it is important to maintain the quality of fishpond area in Blanakan, Subang. Primary productivity can be defined as the production rate of organic carbon per unit time which is the result of solar energy by green plants to be converted into chemical energy through photosynthesis. Primary productivity can be used to define the quality of an ecosystem including fishpond. The aim of this research was to measure the value of primary productivity in mangrove fishpond, determine the correlation between the primary productivity and the content of nitrate, phosphate, and chlorophyll-a, and to analyse the significance primary productivity differences among three sampling stations. The samples were collected from three sampling stations, where all of those consist of mangrove Avicennia marina vegetation. Each station was divided into two points based on different depth i.e. 0 and 1,5 meters. The measurement of primary productivity was done by light-dark bottle method, meanwhile the nitrate, phosphate and chlorophyll-a concentration by spectrophotometer method. The result showed that the value of primary productivity ranged from 39.0625 to 101.5625 mgC/m3/day with the highest value obtained at station I and the lowest value at station III. According to statistical test, there were a significant differences of primary productivity value among three sampling stations with the value is 0.003 (p < 0.05). Correlation analysis showed that primary productivity was correlated positively with chloropyll-a and negatively with nitrate and phosphate contain water.
Antibacterial activity of ZnO nanoparticles fabricated using laser ablation in solution technique
Authors: Yudasari Nurfina , Wiguna Pradita A. , Suliyanti Maria M. , Imawan Cuk 
Published: October 2019

Abstract
The zinc oxide (ZnO) nanoparticles have been produced by using laser ablation in solution technique, resulting nanoparticles with hexagonal wurtzite structure and the size range of 20 – 50 nm. The optical characterization has predicted the nanoparticles band gap at least 3.16 eV. The ZnO nanoparticles were employed as an antibacterial agent for the growth of Escherichia coli (E. coli), and it shows a great potential. Total plate count (TPC) analysis was conducted by applying the ZnO nanoparticles with different concentration of 5%, 10%, 15%, 20%, 25% and 30% (portion of bacteria medium). The 5% concentration could reduce more than half of the E. coli population after 24 hours incubation time. There was no living bacteria detected for 20%, 25% and 30% ZnO concentration.
The Role of MgO as Swelling Cements Admixtures under CO2 Attack on API Class-G Cement
Authors: Palilu Juniarto M , Soegijono Bambang , H Marbun Bonar T 
Published: October 2019

Abstract
API Class-G Portland cement commonly put in as zonal isolation material in oil and/or gas well. Corrosion against the well zonal isolation material could lead to potential leakage of formation fluid such oil, gas, or water. It is widely known that ordinary Portland cement is thermodinamically unstable in CO2 rich environment, which can be found in the CO2 geological sequestration. CO2 attack on API Class-G cement had been observed through experiments that simulate the down hole condition of Geological Sequestration of CO2. Some of the experiment reveal the detrimental effect of CO2 such as increase of porosity and permeability of cement sheath corroded by CO2 attack. The degradation of API Class-G cement by CO2 involves emergence and crystallization of CaCO3 from Ca(OH)2 which is formed during hydration of cement. In this experiment, we examine the role of addition of MgO swelling cement by weight fraction to mitigate the corrosion caused by CO2 against downhole hardened API Class-G cement thus inhibits the occurrence of leakage path of CO2. Observation for characterization and analysis by XRD, optical microscope, and cement paste uniaxial volumetric expansion presented in this paper. The conclusion will provide insights into design of carbonation resistant cement slurries using swelling cements admixtures.
Aitken’s Generalized Least Square Method for Estimating Parameter of Demand Function of Animal Protein In Indonesia
Authors: Virgantari Fitria , Wijayanti Hagni , Koeshendrajana Sonny 
Published: October 2019

Abstract
Ordinary least square (OLS) method is the most popular and commonly technique used to estimate numerical values of parameters of selected regression models. This was due to its unbiasedness property. However, when elements of dependent variable have unequal variances and/or correlated each other, there is no guarantee that the OLS estimator will show the most efficient within the class of linear unbiased estimators. For conditions generally encountered, GLS method is proposed an estimation procedure which yields coefficient estimators at least asymptotically more efficient than single equation OLS estimator. This method is derived by Aitken and it’s named Aitken GLS. This paper reported a study of application of Aitken’s GLS method for estimating parameter of demand function of animal protein in Indonesia of which have a system equation. This system of equation causes violation of the assumptions of homoscedasticity and independency of estimated parameters. Secondary data obtained from the Central Bureau of Statistics 2016 in 34 provinces in Indonesia was used in this study. Animal food was grouped in terms of fish, meat, eggs and milk. Results showed that error of those three equations were correlated. It suggests that GLS method should be used. Normality and homogenity assumptions were not violated. The determination coefficient was 99%, indicating that the method was very good.
Introducing Fermat Sequences
Authors: Wibowo R W 
Published: October 2019

Abstract
This paper focuses on simple observation of Fermat’s factorization method (FFM) applied on the first 5 × 106 odd number. The number of iteration used in the FFM is related to the factor that the method found for each odd number. A new collection of sequences or sets of numbers (we called it Fermat-d sequences) can be generated based on the factor that we found using this method. For example, the first member (Fermat-1) in this collection of sequences is odd prime number sequence, which has factor–of course–of 1 and has highest number of iteration in the FFM, which is ∼half of the number itself. The next member of these sequences (Fermat-3, Fermat-5, and so on) are always start from d
2, continue with arithmetic progression of 2d, but, with additional ‘random jumps’ related to the prime number distribution. We present the first exploration of these new sequences (not registered in oeis.org yet) and the beauty of the location of these sequences in the Ulams and Sacks spiral.
Introduction of Emaya Observatory
Authors: Wibowo A 
Published: October 2019

Abstract
Located at the coordinates of 107°47′39″BT and -6°24′15″ LS maked Emaya Observatory as an observatory that closed to the center of astronomical studies in Indonesia, Bosscha and the astronomy faculty at ITB, as well as Jakarta which known as the first Planetarium in Indonesia. This observatory can facilitate access for education and training in improving the performance of observatory technicians. It was very well aware that the observatory that established was a private observatory which would require an injection of knowledge and motivation. Because this observatory was not managed from who had astronomical background. So that it required hard work, so that the observatory can still function properly. The Emaya Observatory was established in 2013 which at the beginning was only aimed at providing servants for the executors of rukyatulhilal only, where this was in line with the founder’s future goals to participate in the development of the Indonesian Nation and establish harmony between people of Indonesia. He believes that by providing a place for rukyathilal, it can provide servitude to people and state. Aside from rukyatulhilal activities, other research activities are also carried out, namely photometry by optimizing the equipment that was currently owned which was a Telescope with a ZWO 120MM camera and DSLR. Also activities in astronomy teaching and training for school institutions both students and teachers who are members of the Science and Physics MGMP, Hisab and Rukayatul training for Islamic organizations or foundations in collaboration with the Subang Ministry of Religion and the Province also provide services in measuring Qibla direction.
The Influence of Humid Atmosphere during the MAPbI3 Perovskite Layer Preparation on the Characteristics of Its Solar Cells
Authors: Nurunnizar Adhita Asma , Hidayat Rahmat 
Published: October 2019

Abstract
Organometal halide perovskite (hybrid perovskite) materials have emerged as a promising material for high power conversion efficiency and low-cost solar cells. The formation of organo-metal halide perovskite layer, however, is very sensitive to some process parameters such as concentration, temperature, and humidity. In this study, we report the preparation of CH3NH3PbI3 (MAPbI3) perovskite crystal layers under a relatively humid air atmosphere and investigated the characteristics of their solar cells with both mesoporous cell structure and planar cell structure. Due to high humidity, we found that the formed layer tends to form a shiny grey to black color layer on the top of the dark brown color perovskite layer. This layer showed poor x-ray diffraction (XRD) pattern and caused poor solar cell performance. The formation of this layer, however, can be prevented by anti-solvent treatment during the preparation of perovskite layer.
A Preliminary result on the rGO functionalization as counter-electrode in dye-sensitized solar cells (DSSC)
Authors: Arsyad Waode Sukmawati , Wardianto Ahmad , Variani Visca Inda , Ilmawati Waode Sitti , Agusu La , Hidayat Rahmat 
Published: October 2019

Abstract
In the effort of replacing Platinum (Pt) based counter-electrode (CE) for reducing fabrication cost in the dye-sensitized solar cell (DSSC), we synthesized rGO powder from graphite bar (commercially available) using modified Hummer’s method with an introduction of microwave irradiation. rGO was attached to the FTO surface by dissolving it in the solvent with the addition of ethyl cellulose (ES) following by two-step annealing process. rGO solution was deposited by spin coating technique with different thickness namely 1 layer rGO (A1), 5 layer rGO (A2), 10 layer rGO (A3) and 15 layer rGO (A4) followed by an annealing process, and the reference cell was assigned as A5 (using Pt). From the thin film resistance measurement using the four-probe method and conductivity calculation, the conductivity decreased as the rGO layer becomes thicker, namely from (0.58 to 0.42, 0.07 and 0.03) S/cm for A1, A2, A3, and A4 in consecutive order. From the photovoltaic measurement, we found that the utilization of rGO as a catalyst in CE increased the efficiency of the cell from 3.82% (A5) to 4.52% (A1). Furthermore, increasing the thickness of rGO layer from A1 (2.1 μm) to A2 (10.5 μm) also increased the efficiency from 4.52% to 5.89%, further increasing on the layer thickness A3 (21 μm) to A4 (31.5 μm) reduced the conversion efficiency to 2.57% and 0.33%. The highest conversion efficiency achieved for the cell with 10.5 μm thickness of CE, specifically A2. Further investigation of the influence of CE thickness and conductivity to the internal parameters of the DSSC must be done in order to gain a much better understanding of this result.
Fast forward of adiabatic spin dynamics : An application to quantum annealing model in triangle spin systems.
Authors: Setiawan Iwan , Gunara Bobby Eka , Nakamura Katsuhiro 
Published: October 2019

Abstract
We propose a scheme of the fast forward of adiabatic spin dynamics in a triangular 3 spin cluster of quantum annealing model and reveal the structure and role of driving pair-wise interaction and three-body interactions. We settle the quasi-adiabatic spin dynamics (QASD) by adding the regularization terms to the original Hamiltonian and accelerate it with use of a large time-scaling factor which realizes QASD on shortened time scale. Assuming the candidate regularization Hamiltonian consisting of three-body interactions besides the pair-wise exchange interactions and magnetic field, we solved the regularization terms. These terms multiplied by the velocity function give rise to the state-dependent counter-diabatic terms (CDTs) for each of adiabatic states. Applying this method to quantum annealing model, we find CDTs which include pair-wise interaction and the 3-body interactions. The driving pairwise and three-body interaction in the fast-forward scheme guarantees the complete fidelity of accelerated states.
Photoproductions of K+Λ and K0Λ Studied by Using Isobar Model
Authors: Clymton S , Mart T 
Published: October 2019

Abstract
We have investigated the neutral kaon photoproduction off a neutron by using an isobar model based on our previous study. The unknown parameters were extracted by fitting the model prediction to experimental data. We analyzed the two Λ channels, i.e., K
+Λ and K
0Λ channels, simultaneously. We used two different approaches in the fitting process which lead to two different models. We compare the agreement between model prediction and experimental data for both models quantitatively. The result reveals the effect of including the K
0Λ data on the model and thus improves our understanding on the kaon photoproduction process.
Spectral Analysis of Volume Operators in Loop Quantum Gravity for Kinematical Case
Authors: Sebastian Ignatius , Husin Idrus , Ariwahjoedi Seramika , Zen Freddy P. 
Published: October 2019

Abstract
Loop Quantum Gravity has become one of the alternative solutions to quantum gravity. This formulation introduced geometrical operators which successfully used to model that in the quantum scale, the space is actually discretized in the order of Planck length. These operators are area and volume operator. The regularization process of these operators came from the classical definition of area and volume, thus, the eigenvalues of area operator and volume operator are respectively the area and volume of the space. However, there exists two types of volume operator, the Ashtekar-Lewandowski operator and the Rovelli-Smolin operator. The significant difference between these two operators is the fact that Ashtekar-Lewandowski operator is sensitive to the direction of the spin networks link, while Rovelli-Smolin operator is not. This difference will produce different spectral. In this article, we compare the resulting spectral of the two volume operators, where both of them is used to calculate the volume of the monochromatic 4-valent and 6-valent spin network for the kinematical case.
The experimental investigation on the crystalline structure, lattice vibration, and optical energy of La1-xBixFeO3 nanoparticles
Authors: Fitria S N , Triyono D 
Published: October 2019

Abstract
Lanthanum-bismuth orthoferrite (La1-xBixFeO3 with x=0.1, 0.2, 0.3, 0.4 and 0.5) nanoparticles have been successfully prepared using sol-gel method. The crystalline structure, lattice vibration, and optical energy analysis have been characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman scattering spectroscopy, and UV-Vis spectroscopy. The XRD revealed the single phase orthorhombic structure with Pnma space group. The crystallite size tends to decrease in the range of 130 – 298 nm with increasing Bicontent. The existence of Fe–O strectching and bending modes were investigated by FTIR spectra and also confirmed by Raman scattering analysis. The optical bandgap was investigated by UV-Vis spectroscopy concluding the decrease of gap energy with Bi-content.