bluuebunny/crossref_metadata_2025_split huggingface dataset:
Intermittent percolation and the scale-free distribution of vegetation clusters
Authors: Martín Paula Villa , Domínguez-García Virginia , Muñoz Miguel A 
Published: June 2020

Abstract
Understanding the causes and effects of spatial vegetation patterns is a fundamental problem in ecology, especially because these can be used as early predictors of catastrophic shifts such as desertification processes. Empirical studies of the vegetation cover in some areas such as drylands and semiarid regions have revealed the existence of vegetation patches of broadly diverse sizes. In particular, the probability distribution of patch sizes can be fitted by a power law, i.e. vegetation patches are approximately scale free up to some maximum size. Different explanatory mechanisms, such as plant–plant interactions and plant-water feedback loops have been proposed to rationalize the emergence of such scale-free patterns, yet a full understanding has not been reached. Using a simple model for vegetation dynamics, we show that environmental temporal variability—a well-recognized feature of semiarid environments—promotes in a robust way (i.e. for a wide range of parameter values) the emergence of vegetation patches with broadly distributed cluster sizes. Furthermore, this result is related to a percolation phenomenon that occurs in an intermittent or fluctuating way. The model also reveals that the power-law exponents fitting the tails of the probability distributions depend on the overall vegetation-cover density, in agreement with empirical observations. This supports the idea that environmental variability plays a key role in the formation of scale-free vegetation patterns. From a practical viewpoint, this may be of importance to predict the effects that changes in environmental conditions may have in real ecosystems. From a theoretical side, our study sheds new light on a novel type of percolation phenomena occurring under temporally-varying external conditions, that still needs further work to be fully characterized.
Identification of subsurface fluid flow using the 2D geoelectric method in Marunda, North Jakarta
Authors: Farhan M , Rosid M S 
Published: June 2020

Abstract
Jakarta is the most densely populated province in Indonesia and it will grow over time. This overwhelming population causes a decrease in the quality and supply of groundwater. Brines has been discovered in several areas in Jakarta. Several studies conducted by earth science researchers conclude that brine in Jakarta appears from either seawater intrusion or trapped connate water. This study focuses on the use of the geoelectric method to evaluate the groundwater quality problem in Kelurahan Marunda. Methods used in this study are resistivity, self-potential, and groundwater sampling. Conductivity, Salinity, pH and water table elevation are the parameters used in this study. These methods are done to observe subsurface groundwater quality, fluid flow and how far the seawater infiltrated. Based on the result of groundwater data of 40 wells, high conductivity and high salinity zones are found. High conductivity in this area affected mostly by the saline factor indicated by high salinity and neutral pH. The subsoil has low resistivity values showed by 2D resistivity data. Also, self-potential data displays a North-South groundwater subsurface fluid flow 1, 20 km from the coastline. Altogether, these data indicate seawater intrusion in Kelurahan Marunda, North Jakarta.
Calculating ground shear strain (GSS) of microtremor data using graphical user interface python programming
Authors: Ina S , Yuliyanto G , Irham M N 
Published: June 2020

Abstract
Programming was made to calculate the Ground Shear Strain (GSS) value of microtremor data using Python. Microtremor is a repetitive ground vibration that propagates in soils containing certain sources. The microtremor method can be used to determine the value of Ground Shear Strains (GSS). Ground Shear Strain can be used to characterize the impacts occur during earthquakes, such as liquefaction, soil cracking, land subsidence, landslides, and ground vibration. Analyzing GSS value can be used to obtain information about soil response of an earthquake as a disaster reconstruction in the mitigation effort. In this research, the data processing conducted by the following steps: (i) Processing data using geopsy software to get the values of predominant frequency (f
0) and amplification(A
0), (ii) Finding νs
30 value using USGS data, and (iii) Making python scripts for calculating microtremor data. The result of this research showed that calculating microtremor data can be done by using python software and has the same value as if using Microsoft excel.
Synthesis of gadolinium nanoparticles in spinach-extracted liquid using a pulse laser ablation method
Authors: Avicenna S , Nurhasanah I , Khumaeni A 
Published: June 2020

Abstract
Colloidal gadolinium nanoparticles (GdNPs) have been produced by using pulsed laser ablation (PLA) method. The synthesis in this study used a low-power neodymium yttrium aluminum garnet (Nd: YAG) laser (45 mJ). Pulse laser beam, which has specifications of 1064 nm, 7ns, 10 Hz, was focused on high-purity metal gadolinium (Gd) surface, which was placed into a spinach-extracted liquid, to produce GdNPs colloid. It is known that the spinach naturally contains iron (Fe), which is a quite high concentration from FeSO4.7H2O. The magnetic characteristics of iron are ferromagnetism, likewise, gadolinium. As the contrast agent, especially in MRI, the magnetic characteristics of the material are needed to improve the image quality. Colloidal GdNPs were successfully produced at a total concentration of 71 ppm after laser bombardment. The TEM image of GdNPS shows that these nanoparticles had a spherical shape. The average diameter of GdNPs was 15 nm.
Characterization of negative corona plasma discharge reactor using point-to-plane electrode configuration in atmospheric pressure and its application in the treatment of woven natural silk
Authors: Muhlisin Z , Rahmawati I , Arianto F , Triadyaksa P 
Published: June 2020

Abstract
This research is aimed at obtaining the characteristics of negative corona plasma discharge with the presence and absence of woven natural silk and to figure out morphological alteration of woven natural silk by negative corona plasma discharge and water absorption characteristics of irradiated woven natural silk. The plasma reactor used employed multi point-to-plane electrode configuration using 100 electrodes. The reactor is connected to a high DC power supply with the point electrodes with spacing and the plane electrode varies from 0.6 to 3.0 cm. The silk sample has a dimension of (10 × 10) cm2. Plasma irradiations were performed with a varied duration that ranged from 5 to 30 minutes. Sample testing was performed using SEM and water drop test. SEM testing results also show damages on the fabric surface compared to non-irradiated fabric. Meanwhile, the water drop test results reveal that optimum absorption for woven natural silk is at a distance of 2.4 cm for 30-minute irradiation. These settings resulted in an average absorption time of 10.28 seconds, which is way faster than absorption for non-irradiated fabric, at 48.88 seconds.
Analysis of variance for strip plot design with missing values: bias correction of the mean squares
Authors: Nisa K , Hamsyiah N , Usman M , Warsono  
Published: June 2020

Abstract
Missing values in strip plot design cause an unbalanced design. As a result, several problems occur in analyzing the data. This paper presents the estimation of two and three missing values from strip-plot design with the fixed model using the Yates approach. However, the estimation toward the missing values in strip-plot design causes bias on the treatment mean squares which is shown by its expected value. To omit the bias caused by the estimated values, a procedure of Satterthwaite-Cochran approximation is applied. The procedure corrects the bias and gives an adjusted analysis of variance for the hypothesis test.
The potential of mixed epibiotic (binahong leaves, anrederacordifolia, and garlic, allium sativum, extracts) as a feed additive to combat aeromonashydrophilainfection on catfish (clariasgariepinus)
Authors: Sarjito  , Prayitno S B , Kusuma N T , Desrina  
Published: June 2020

Abstract
Catfish are one of the most commercially important fish cultured and consumed in Indonesia. Catfish (Clarias garipienus) is one of the most commercially important freshwater fish cultured and consumed in Indonesia. However, Motile Aeromonas Septicemia (MAS) disease was caused by Aeromonas hydrophila is one of the obstacles which are often to be found during the culture. This study aimed was to determine the epibiotic extracts of binahong leaves (BLE) and garlic (GE) as a feed additive on the growth performance and survival rate of catfish against Aeromonas hydrophila infection. This research was conducted with Completely Randomized Design (6 treatments and 3 replications)in the aquaculture department laboratory, Fisheries and Marine Science Faculty of Diponegoro University. The treatments were various dosages of the mixture of epibiotic extracts, namely A (2.500 ppm BLE+0 ppm GE), B (1.875 ppm BLE+250 ppm GE), C (1.250 ppm BLE+500 ppm GE), D(625 ppm BLE+750 ppm GE), E (0 ppm BLE+1.000 ppm GE) and K (0 ppm BLE+ 0 ppm GE). The result of the research indicated that a mixture of epibiotic was able to increase the survival rate but not in the growth rate. This treatment also was affected by the blood profile of cat fish ie. Erythrocyte, leucocyte, and hemoglobin These results showed that the best dosage of a mixture of epibiotic extracts (1.250 BLE+500 ppm GE) resulted in 86,67% of survival rate.
The density of microplastic in sea cucumber (Holothuria sp.) and sediment at Tidung Besar and Bira Besar island, Jakarta
Authors: Sayogo B H , Patria M P , Takarina N D 
Published: June 2020

Abstract
Plastic waste is the dominant type of marine waste found. The plastics are degraded in physics, chemistry and biology to a size of <5 mm. Sea cucumbers are deposite feeder type animals that get food by stirring up sediments so that there is microplastic content in sea cucumbers. This research aims not only to analyze the microplastic density in sediments and sea cucumbers but also to analyze the correlation between microplastic density in sediments and sea cucumbers. This research was conducted from February to April 2018. The research data was the descriptive with purposive random sampling and correlational studies method. Based on calculation analysis, microplastic found in sediments and sea cucumbers on Tidung Island and Bira Besar Island, consists of 4 (four) types. There are fiber with 2722 particles/g; 1982 particles/g, fragment 254 particles/g; 547 particles/g, film 100 particles/g; 50 particles/g and pellets 14 particles/g; 9 particles/g. Microplastic found in sea cucumbers consists of Tidung Island and Bira Island. Consist 4 (four) types, which are fiber, 2033 particles/g; 1247 particles/g, 137 particle fragments/g; 183 particles/g, film 60 particles/g; 69 particles/g and pellets 9 particles/g; 4 particles/g. Correlation results showed a positive correlation with microplastic in sediments and in sea cucumbers.
Analysis of total plate count and fungus yeast of mahkota dewa fruit as raw material for making syrup
Authors: Winarni S , Arifan F , Setyawan A , Nurdiana A , Windari  
Published: June 2020

Abstract
Mahkota Dewa (Phaleria macrocarpa L.) or Simalakama plants are native plants from Papua. The Mahkota Dewa fruit can be used to treat various diseases ranging from flu, rheumatism, lungs, cirrhosis of the liver to cancer. The Mahkota Dewa fruit contains alkaloids, saponins, and flavonoids. The presence of flavonoids in the fruit of this plant can be used as an antioxidant. One of the innovations in the use of this fruit is m turn fruit into syrup. Syrup manufacturing process has several stages, namely by choosing the fruit that is ripe and dried first. The Mahkota Dewa syrup from Tazakka in Pledokan Village, Sumowono Subdistrict still uses direct sunlight during the drying process. This study aims to determine the bacterial content of the dried fruit of the Mahkota Dewa with the sun and dry with the oven so that producers can still use the oven aids if the results are not much different. The test site is located in Peldokan Village, Sumowono District, Central Java Medical Laboratory and Medical Devices Testing and Diponegoro University Semarang. The materials and tools used are the mature Mahkota Dewa, tray, oven, dried fruit Mahkota Dewa and oven, the crown god syrup sample, and laboratory equipment. Bacterial testing uses the TPC (Total Plate Count) and Fungus Yeast methods. Based on the results of the bacteriological test analysis of the dried fruit Mahkota Dewa it is known that the number of general germs or TPC and Fungus Yeast in oven dried fruit is more than that of the sun dried which is 1.8 × 10 5 CFU / gram and 3.9 × 10 4 CFU / gram. The proximate content of the Mahkota Dewa syrup is 1.43% protein, 0.09% fat, 70.16% carbohydrate, 28.18% water content and 0.14% ash content.
The food plant ethnobotany of Ampari tribe community in Papua, Indonesia
Authors: Waroy H F , Utami S , Jumari  
Published: June 2020

Abstract
The Ampari tribe has a variety of biological diversity especially of food plant species, Our studied focus on an ethnobotanical research project conducted in the Menawi village, Kabupaten Yapen Province Papua, regarding the use of plants as a food source that has been used as food for Ampari tribe in Papua. The research was conducted from November 2017 to May 2018 in-depth structured interview, observation around the local community. Altogether, the use of 53 species from 31 famili of food vegetables has been recorded, Corresponding to this research have been collected and analyzed The majority of Ampari tribe using Arecaceae, including Metroxylonspp, Areca catechu L, Cocos nucifera Land Nypafruticans Wurmbthose represent native species from Papua and majority Ampari tribe used Metroxylonspp as a staple food. Areca catechu, Cocos nucifera L., Nypafruticans Wurmbwere used as an alternative food for beverage ingredients. The consumption of these resources is still quite popular practice in this region.
Finding parameters relationship for disinfectant gas production
Authors: Facta M , Hermawan H , Umiati N A K , Amjad M 
Published: June 2020

Abstract
Water purifying is an important process to get fresh water for human needs. Several treatments such as advanced filtering using activated carbon and chlorine have been done to get clean water. However, most of the previous treatments required complex maintenance and left a by product. The choice for disinfectant gas is going to ozone gas because it has a minor harmful impact on the environment. This work is to find related parameters and to formulate those parameters in the equation to predict disinfectant gas production in the silent discharge process. The theoretical analysis provides a general approach for the equation models and experimental results complete the required data for the regression technique to determine constants and terms in equation model at the saturated region. Finally, a proposed equation model has successfully produced a prediction curve that is matched with experimental results.
Probing the interaction between EC1-EC2 domain of E-cadherin with conformational structure of cyclic ADTC7 (Ac-CDTPDC-NH2) peptide using molecular docking approach
Authors: Siahaan P , Darmastuti N E , Aisyafalah S , Sasongko N A , Hudiyanti D , Asy’ari M , Prasasty V D 
Published: June 2020

Abstract
Increasing significantly brain disease every year make difficult to help people who suffer disease in their brain. Drug delivery can be reached through a paracellular pathway. The use of the derivative cadherin peptides (ADT and HAV) to enhance the porosity in this pathway was investigated. The aim of this studied to determine the best conformation of cyclic ADTC7 peptide which interacts with EC1-EC2 domain of E-cadherin with energy binding and active sites parameters. The methods used in this study are: 1). MD simulation using GROMACS software, and 2). Molecular docking with AutoDock software. The variation used on MD simulation are atomic distances and constant restrains in atom S14…S78 for 20 ns. The result of MD simulation for 20 ns shows that the linear and cyclic ADTC7 peptide are -118,824.84 kJ.mol−1 and -52,985.95 kJ.mol−1, respectively. The best conformation of cyclic ADTC7 peptide with the EC1-EC2 domain of E-cadherin is C1 with the lowest binding energy of -24.56 kJmol-1. The active site at residues such as Val3, Ile4, Pro5, Pro6, Ile7, Ser8, Leu21, Val22, Gln23, Lys25. It has RMSD value less than 2 Å, low energy binding and low inhibition constant, a large population and a stable pose when validation docking.
Electrolysis results in a comparison of metformin using aluminum, zinc, and iron (as the anode) as well as used carbon (as the cathode)
Authors: Suhartana S , Purwanto P , Darmawan A 
Published: June 2020

Abstract
Metformin is an antidiabetic drug that can be obtained easily in pharmacies/on the market, because it is traded freely, so people can easily buy and consume it. Ferrous metal, aluminum metal, and zinc metals are metal quite easy to find and are often used by the public. Metformin and Ferrous metal, aluminum metal and zinc metals are metal are quite familiar in the community. This research aims to deconcentrate metformin which can be obtained easily in pharmacies / on the market by electrolysis method, using ferrous metal, aluminum metal, and zinc metals are as an anode and carbon as the cathode. Electrolysis of metformin has been carried out using ferrous metal, aluminum metal, and zinc metal as an anode. The success of the electrolysis process was seen with a decrease in the sample COD index. In the case without the addition of electrolytes using ferrous metals, the COD index of the sample reduction was very low (9-17%). This research aims to increase the success of the electrolysis process, by adding various kinds of electrolytes, such as acetic acid (weak electrolytes), hydrochloric acid (strong electrolytes), sodium chloride and Fenton reagents. The addition of electrolytes can increase electrolysis yield significantly. The interaction between metformin during electrolysis is traced to the possibility of changes in the chromophore group (with UV-Visible spectra) and the functional group (with FTIR spectra) of the sample. From the research data obtained information that there is a decrease and shift in UV-Visible spectra and changes in functional groups after the electrolysis process occurs. The best electrolysis percentage is obtained, after adding NaCl solution and Fenton’s reagent in the range of 50 -66%.
Synthesis of silica-rich zeolite using quaternary ammonium-based templates
Authors: Sriatun S , Susanto H , Widayat W , Darmawan A , Sriyanti S , Kurniasari R , Kurniawati R 
Published: June 2020

Abstract
In this study, silica-rich zeolite was made at a ratio Si/Al = 30. The template used was cationic surfactant from quaternary ammonium, tetrapropylammonium bromide (TPAB) and cetyltrimethylammonium bromide (CTAB). The CMC for TPABr (n – C3H7)4N is 10−3 M, and spherical micelle of CTAB is 8.9x10−4 M. The concentration of the TPAB and CTAB which used in this study were 0.0325; 0.125; 0.25 and 0.5 M. The results show that the type of synthesized zeolites are silica-rich sodalite with the crystal size 216 A°. The use of quaternary ammonium-based templates can increase crystallinity and reduce the size of silica-rich sodalite crystal grains but remain in the mesopore material size range. The concentration of the tetrapropylammonium bromide (TPAB) template is very influential on surface area and pore volume, whereas for cetyltrimethylammonium bromide (CTAB) it affects surface area but not on pore volume. The largest surface area and pore volume of 96 m2/g and 3.4×10−2 obtained for silica-rich sodalite using a landfill template at small concentrations.
Multivariate capability indices in inventory control
Authors: Mustafid  , Ispriyanti D , Sugito  , Hakim A R 
Published: June 2020

Abstract
Inventory control in the industry has an important role in supply chain management to produce products according to management standards or quality standards based on consumer demand. In the apparel industry, inventory control is adjusted to the type of apparel product according to consumer demand. The research aims are to derive a multivariate inventory control model with multivariate capability analysis based on several types of apparel products as quality characteristics. The method in the research uses the T2 Hotelling multivariate control chart and the multivariate capability indices for analysis apparel inventory control by management specification standards. We derived the T2 Hotelling multivariate control chart and the multivariate capability indices using data with the assumption that multivariate data are controlled and has multivariate normal distribution Variable research uses quality characteristics that are grouped into two types of apparel products. This model is useful as a multivariate inventory control model that can manage the amount of production and supply of products based on probabilistic consumer demand.
Alternative scale-invariant Higgs mass generation using hidden sector SU(Nc)xU(1)3
Authors: Soesanto Q M B , Azam M , Richardina V , Satriawan M 
Published: June 2020

Abstract
Spontaneous Symmetry Breaking (SSB) is a method to generate mass for all elementary particles in the Standard Model (SM). Even so, it turns out that the Higgs mass term in the Higgs potential, which responsible for the SSB, does not scale invariant. Based on this problem, instead of using SSB from the SM to explain the origin of mass, we erase Higgs’s mass term from the SM Lagrangean and introduce a hidden sector Lagrangean to produce an alternative way to generate Higgs mass. We use Scalar Bilinear Condensate ineffective theory to obtain Higgs mass via the Higgs portal and generate the SSB. The hidden sector in this alternative model is described by an SU(N
C
A) gauge theory with U(1)3 flavor. In the calculation, we use the Mean-Field Approximation Lagrangean in obtaining the vacuum of the potential to get a Higgs mass term in this model.
Network boot system for low-cost laboratory computer
Authors: Aryotejo G , Mufadhol M 
Published: June 2020

Abstract
The problem in private universities in the developing country is that they have many computers in the computer laboratory but do not have enough resources to maintain it. The part of the computer that is most frequently damaged is a hard disk drive due to unstable electricity and causes many computers to become inactive due to universities inability to replace it. In this study, we present comprehensive research on reviving existing inactive computers with minimal expenditure. We use a combination of PXE, DHCP, TFTP, and VHD to implement the Network Boot System (NBS). In addition, we conducted simulations to measure the client’s network booting time on HDD and SSD. The simulations were carried out using 15 client PCs booted simultaneously from NBS’s server using two different master images on HDD and SSD. We found that all of the inactive computers could work normally. The use of SSD could increase the performance of NBS significantly. The expenditure cost to use mainstream SSD for an NBS’s server is much lower than having to replace the HDD for the entire inactive computers. Those strengthen that an NBS is feasible to be used on low-cost laboratory computers.