bluuebunny/crossref_metadata_2025_split huggingface dataset:
Relationship of Rainfall and IOD Phenomena by using Spectral Analysis and SARIMA
Authors: Miftahuddin  , Furqany N E , Bakar M A 
Published: June 2021

Abstract
Rainfall is very essential for life and it has complexity process. To obtain the relationship between rainfall in time-spatial of Aceh region and the Indian Ocean Dipole (IOD) phenomenon, we used spectral-analysis and SARIMA model. Identification results show that the rainfall data monthly in Aceh Barat (ABR), Aceh Besar (ABS), Sabang (S) and Aceh Utara (AU) has a similar pattern. However, due to the sensitivity of the occurrence of the IOD, the ABR region has higher rainfall compared to ABS, S and AU regions. Rainfall in all regions observation has a peak time, namely at the end of the year (October-November-December). It has the negative peak of the IOD event occurred in September-2016 while the positive peak point occurred in October-2019. Overall, the normal phase occurred from January to April-2019. In peak season in ABR and ABS, the rainfall intensity increased. The results showed that the rainfall model in ABR and S has normal distribution, whereas in ABS and AU has nonnormal distribution. Furthermore, the rainfall model in ABR with SARIMA(2,0,2)(0,1,1)6 is the best model compared to model of three other regions with high accuracy forecasting.
A case study of an edge-magic total labeling of (a,b)-cycle books
Authors: Swita B , Rafflesia U , Susanti S , Andari F , Simanihuruk M 
Published: June 2021

Abstract
Suppose α and β be the order and size of a graph G respectively. A one-one function h which maps the set of vertices and edges of a graph G onto the integers 1, 2, 3, …, α + β such that h(u) + h(uv) + h(v) = c for any edge (uv) ε E(G) is called an edge-magic total labeling of If h(u) ε {1,2, …, α} for any uεV(G) then h is a super edge-magic total labeling of G. One of interesting research topic is super edge-magic total labeling of cycle book. A cycle book B(a, m, b, n, t) is made up from m copies of cycle Ca
and n copies cycle Cb
with a commont path Pt
. Super edge-magic total labeling of a cycle book B(a, m, b, n, 2) is still under investigation even for the case a = b This paper talk about a partial solution to this problem. We prove that a cycle book B(5, 2, 3, n, 2) has a super edge-magic total labeling for all positive integr n. In addition, we show that a cycle book B(5, 2, 3, n, 2) have an edge-magic total labeling for an integer n, 1 ≥ n ≥ 6.
Control design for tracking problem of the bilinear control system using observation matrix and pole placement
Authors: Mu’tamar Khozin , Naiborhu Janson 
Published: June 2021

Abstract
Bilinear control system is widely used, especially in the chemistry and engineering to describe chemical reactions and biological populations. Many of them are discussing about how to stabilize the system. In this paper, control design for tracking problem of the bilinear control system is presented. It is assumed that bilinear control system has full relative degree and the system is observable. Control design is divided into two stages. First, using observation matrix, tracking problem of bilinear control system transformed into stabilization problem of linear control system. Then, the linear control system is stabilized using static feedback control with pole placement. Examples are given to show controller performance.
On the characteristic of homomorphisms on cyclically ordered groups
Authors: Gozali S M , Rosjanuardi R , Yusnitha I 
Published: June 2021

Abstract
For cyclically ordered groups G, G’, the mapping f: G → G’ is called a homomorphism, if f is a homomorphism with respect to the group operation, and whenever x,y,z in G such that [x,y,z], and f(x), f(y), f(z), are distinct, then [f(x), f(y), f(z)]. In this paper, it will be given some conditions related to group homomorphisms.
Bifurcation analysis of epidemic model waning immunity
Authors: Fahdilla C , Putri A R , Haripamyu H 
Published: June 2021

AbstractIn this paper, we analyse the bifurcation of epidemic models. Those model is waning immunity. First, the stability of those system is analyzed by analyzing the stability of critical points. The threshold number that associated with the stability was determined. Later, the existence of bifurcation was analyzed. The result show that bifurcation exist and threshold number is considered as bifurcation parameter. Numerical simulation is given to confirm the analytical results by showing the graphic solutions and phase portrait.
Twisted Toeplitz Algebras of Cyclically Ordered Groups
Authors: Rosjanuardi R , Gozali S M , Yusnitha I 
Published: June 2021

Abstract
We consider the group ℤƗlex ℤ as a linear ordered abelian group, and we induce a cyclic order so that the group is cyclically ordered, and denote it as ℤƗCOG ℤ. Suppose σ is a 2-cocycle on the group ℤƗCOG ℤ. We construct an isometric representation of the semigroup (ℤƗCOG ℤ). This representation generates a canonical algebra which we call the twisted Toeplitz algebra of the cyclically ordered group ℤƗCOG ℤ.
Robust Counterpart Open-Capacitated Vehicle Routing Problem with Time Windows and Deadline (RCOCVRPTWD) Model in Optimization of Waste Transportation in Subdistrict Kalidoni, Palembang Using LINGO 13.0
Authors: Puspita F M , Melati R , Br Simanjuntak A S , Yuliza E , Octarina S 
Published: June 2021

Abstract
Robust Counterpart-Open Capacitated Vehicle Routing Problem with time windows and deadline (RC-OCVRPTWD) model which was formed and explained in this paper, is a model used to design solid waste control routes to minimize the distance and time needed for vehicles to complete waste transportation in Kalidoni Sub-District, Palembang. The completion of this route is expected to be able to overcome the occurrence of solid waste accumulation in Kalidoni District, Palembang that involved two characteristics the time that takes for the vehicle to across the route and the time needed to transport waste to the vehicle, which is called time windows. The second combination of time above is deadline. Waste that are transported every day are divided into working areas where the distance of temporary disposal to other disposal in one working area and the volume of waste transported will affect the length of deadline needed. This RC-OCVRPTWD model uses the LINGO 13.0 application to obtain optimal routes and deadlines. The results show that the working route for Kalidoni Sub-District in working area 1 is completed within 28.6 km and a deadline of 2 hours 51 minutes. In working area 2, is with a distance of 23.6 km and a deadline of 1 hour 42 minutes, and in working area 3 is with a distance of 38 km and a deadline of 3 hours 16 minutes.
Implementation of arc flow model incapacitated multi-period cutting stock problem with the pattern set up cost to minimize the trim loss
Authors: Octarina S , Septimiranti D , Yuliza E 
Published: June 2021

Abstract
Two-dimensional Cutting Stock Problem (CSP) is a problem in cutting raw materials where the trim loss is on two sides, namely the width and length sides. This research implemented the Arc Flow model incapacitated multi-period with set up cost to minimize the trim loss in the cutting of paper. The cutting patterns were generated by the Pattern Generation (PG) algorithm. Furthermore, it was formulated to a linear Arc Flow model where the constraints indicated the number of demands per item. The solution of the model was completed using the LINGO 13.0 application. The optimal solution of the Arc Flow model showed that the quantity demands for the second and third types of items were fulfilled. The maximum amount of inventory contained in the second type of item for the second period was 132,517 sheets. Excess inventory will become a surplus. Based on the arc flow model solution, it turned out that no trim loss was produced, or in other words, trim loss is equal to zero.
Modeling the Count Data of Public Health Service Visits with Overdispersion Problem by Using Negative Binomial Regression
Authors: Espinoza Eha , Saputri Ully , Hafiz Fadilah Faizal , Devianto Dodi 
Published: June 2021

Abstract
The count data of health service visits can be modeled into Poisson regression analysis, where there is no overdispersion assumption by looking at the comparison between mean and variance. The overdispersion test is performed by using the ratio of the sum of Pearson residuals over the number of degrees of freedom that must be less than one. The overdispersion problem can be corrected accurately by building mixture distribution where the parameter of Poisson distribution is made to have Negative Binomial distribution as the theoretical model. The data used in this study are the number of visits to public health service at Padang city as many as 460 data, where the predictor variables are age, gender, education level, occupation, income, home health status, individual health status, health insurance type, distance to health service, and diet type. The best model of negative binomial regression is selected by considering the values of AIC, BIC, Log-likelihood, and overdispersion tests that occur between the resulting models. The final result of this count data model with negative binomial regression fits better and overcomes the overdispersion problem with the significant variable is individual health status for this population, and it can be explained that the more individual has a history of having severe illness the more often the number of visits to the health service, meanwhile the other predictor variables have no effect to the number of visits.
The dynamics of rainfall and temperature on peatland in South Sumatra during the 2019 extreme dry season
Authors: Irfan M , Virgo F , Khakim M Y N , Ariani M , Sulaiman A , Iskandar I 
Published: June 2021

Abstract
During the extreme dry season of 2019 massive fires broke out on peatlands in South Sumatera. This study examines the dynamics of rainfall and temperature in the peatlands of South Sumatera in the 2019 dry season as one of the fire disaster mitigation efforts. The data used are in situ measurement data by the Peatland Restoration Agency’s measurement stations on two peatlands in South Sumatera. The results of this study indicate that rainfall in July until October 2019 was very minimal even in one of the study sites in August there was no rain. This shows that rainfall anomaly has occurred along with massive fires so that rainfall is possible to be used as one of the fire control parameters in peatlands. The lack of rainfall in South Sumatera during this period was due to the positive Indian Ocean Dipole phenomenon that occurred in the Indian Ocean. The results of this study also showed that temperature did not have a clear pattern of relationship with fire events on peatlands.
Macro and Micro Minerals Composition of Indian Scad (Decapterus russelli) From Mollucas Waters
Authors: Hadinoto S , Fasa L R , Smith H 
Published: June 2021

Abstract
Minerals have a very important role for the human body, fulfillment of mineral needs in humans is obtained by consuming food. One source of animal minerals is Indian scad. Indian scad has a mineral composition that the body needs. This study aims to determine the macro and micro minerals composition of Indian scad. Samples are grouped by body weight, then prepared and tested for macro minerals (Ca, K, Mg and Na) and micro minerals (Cu, Fe, Mn, Se and Zn). The results of grouping the Indian scad based on the average weight obtained by 3 (three) groups, namely group A (72.8 g), B (136.1 g) and C (222.2 g). Proportion of Indian scad has a 69% flesh, 18% head and bones, 13% viscera and gills, 1% blood and water. Macro mineral measurements in each group of fish obtained results: Calcium 40.353 mg/g (A), 37.559 mg/g (B) and 71.334 mg/g (C), Potassium 69.350 mg/g (A), 55.834 mg/g (B) and 67.146 mg/g (C), Magnesium 10.701 mg/g (A), 7.985 mg/g (B) and 11.550 mg/g (C) and Sodium 29.525 mg/g (A), 28.942 mg/g (B) and 29.072 mg/g (C). Micro minerals measurement results: Copper 0.119 mg/g (A), 0.046 mg/g (B) and 0.068 mg/g (C); Iron 0.363 mg/g (A), 0.204 mg/g (B) and 0.324 mg/g (C); Manganese 0.013 mg/g (A), 0.011 mg/g (B) and 0.014 mg/g (C); Selenium 0.464 mg/g (A), 1.007 mg/g (B) and 2.847 mg/g (C); Zinc 0.262 mg/g (A), 0.227 mg/g (B) and 0.431 mg/g (C). Indian scad flesh has a macro and micro minerals composition that varies depending on the body weight of the fish.
Preparation of Activated Carbon from Gnetum gnemon Shell Waste by Furnace-NaCl Activation for Methylene Blue Adsorption
Authors: Lelifajri  , Rahmi  , Supriatno  , Susilawati  
Published: June 2021

Abstract
A low-cost activated carbon from waste biomass has been yielded and applied for dye removal. Gnetum gnemon shell from local agriculture and waste biomass was used as a carbon source. The activated carbon powder was yielded after Gnetum gnemon shell waste heating in furnace at temperature of 400°C and it was then activated with NaCl. Parameter effects such as contact time and pH on methylene blue dye adsorption were evaluated. The optimum methylene blue dye adsorbed on prepared activated carbon was achieved at contact time of 20 minutes and pH 8. Langmuir isotherm model was appropriate to describe the dye adsorption by prepared activated carbon. In this study, a maximum absorption capacity (Qmax) of 62.5 mg g-1 was obtained which indicated a potential activated carbon-based adsorbent for dye adsorption.
Synthesis of proton-conducting membranes based on sulfonated polystyrene and bacterial cellulose
Authors: Sawitri Nurmania , Ghufira  , Fitriani Dyah , Banon Charles , Agus Triawan Deni , Gustian Irfan 
Published: June 2021

Abstract
Synthesis of composite material based on sulfonated polystyrene and bacterial cellulose as a proton membrane has been carried out. In this study, the membrane was made with the variations mass ratio of sulfonated polystyrene : bacterial cellulose 1,5: 3,5, 2,5: 2,5, 3,5: 1,5. The previous step was sulfonation of polystyrene, in which the polystyrene used is styrofoam from electronic goods packaging waste. Polystyrene in this case styrofoam is sulfonated using the sulfonating agent trimethylsilyl chlorosulfonate. The membranes have characterized by analyzing of functional groups, proton conductivity, cation exchange capacity, and degree of swelling. The FTIR spectrum showed that the sulfonated polystyrene-bacterial cellulose composite material was successfully synthesized which was shown at the peak at wave number 1124.767 cm−1 which was a SO3 stretching vibration. The peak at wave number 962-1150 cm−1 was assigned the stretching of CO vibrations for C-OC and C-OH which indicates cellulose glycosidic bonds. The highest Cation Exchange Capacity (CEC) value and proton conductivity were in the composite membrane: bacterial cellulose mass ratio 3,5: 1,5, the CEC value 2.25 meq/g and the proton conductivity value 1.176 x 10−6 S/cm2. This result shows that the sulfonated polystyrene-cellulose bacterial composite membrane has the ability to deliver protons so that it has the potential to be developed as a fuel cell membrane.
Effect of Flow Rate on the Absorption of Rhodamine B, Methyl Orange and Methylene Blue Dyes with Langsat Shell (Lansium domesticum)
Authors: Kurniawati D , Bahrizal  , Sari T K , Adella F 
Published: June 2021

Abstract
Dye waste comes from textile, paint, batik and food industries wastes that produces colored liquid waste which is harmful to the environment. For this reason, the research is carried out to find solutions to these problems. This study aims to determine the effect of flow rate on dye absorption using the column method. Adsorption was carried out by langsat shell activated with nitric acid. The flow rate variations used were 1 mL/minute, 2 mL/minute, 3 mL/minute and 4 mL/minute. The results obtained were that the rhodamine B dye absorbed 1.7901 mg/g, the methyl orange dye occurred 6,0827 mg/g, and the methylene blue dye 12,524 mg/g
Assay Optimization of Lactate Levels in Athletes Using Nanophotometry Methods
Authors: Alicia Farma Siska , Syahrastani  
Published: June 2021

Abstract
Lactate levels are the main parameter used in sports as a marker of fatigue. In general, the measurement of lactate levels in research uses the rapid test diagnostic test method. Biochemically there will be a difference between rapid test measurements with enzymatic methods. But there are many factors to consider in enzymatic testing. The purpose of this study is to optimize the substrate volume and total reaction volume in enzymatic measurement of lactate levels using a nanophotometer. Lactate can be detected in biological samples such as serum, red blood cells, cell culture, and fermentation media. In this study serum was used as a sample obtained from a university student who carried out swimming activities as far as 200m. Then the serum is used to measure lactate levels using the Lactate Assay Kit (MAK064, Sigma Aldrich). Lactate levels were read calorimetric at a wavelength of 570nm with a nanophotometer. Optimization results show the optimum substrate volume is 1.5 ul with 11 ul buffer with the final reaction volume of 25 ul. Standard curves showed regression values (R2) 0,9909, and lactate levels in2,848nmol/µl samples.
Isolation and Characterization of Inulinase Producing Bacteria Dahlia hybrida Hort
Authors: Fifendy M , Yuni A , Kurniati L , Indriati G 
Published: June 2021

Abstract
The use of enzymes in the industrial world is growing, one of which is inulinase. This enzyme can hydrolyze inulin to fructose. The use of fructose as a food or beverage sweetener is more beneficial than sucrose. Inulinase can be produced by plants containing inulin and microorganisms. The ability of bacteria to produce inulinase is more effective and efficient because it is able to live in an extreme environment and is easily manipulated genetically. The purpose of this study was to isolate and determine the characteristics of inulinase-producing bacteria from the Dahlia hybrida Hort rhizosphere. This research was conducted using a descriptive method which was carried out in the Laboratory of Microbiology, Biotechnology, and Biochemistry, Faculty of Mathematics and Natural Sciences, UNP and the Biotechnology Laboratory of Andalas University. The working procedure is inulin extraction, bacterial isolation, morphological, microscopic and molecular observations which include the process of bacterial DNA isolation and amplification using the 16S rRNA gene. Data on bacterial characteristics were analyzed descriptively including morphology, microscopy, and molecular.The results obtained were four isolates of inulinase-producing bacteria which were classified as gram-negative bacteria with bacillary-shaped cells. However, it has a different colony morphology, namely LK1 isolate irregular shape and uneven colony edges, LK2 isolate round and flat colony edges, LK3 isolate in the form of roots and branched colony edges like fine threads and LK4 isolate round and flat colony edges. DNA isolation of inulinase-producing bacteria was successfully carried out, but amplification of the 16S rRNA gene was not successful. This is probably due to the not optimal annealing temperature in the PCR cycle.
Comparison of Nutritional Content of Water Spinach (Ipomoea aquatica) Cultivated Hydroponically and Non-Hydroponically
Authors: Fevria R , Aliciafarma S , Vauzia  , Edwin  
Published: June 2021

Abstract
Water spinach is well known by our society as a green vegetable that has a high vitamin mineral content at a low price and is easy to obtain and its cultivation is also relatively easy. This character supports the development as a potential horticultural crop commodity to be developed. The main source of vitamins is leafy green vegetables. Leaf green vegetables can be cultivated non-hydroponically and hydroponically. In vegetables there is beta-carotene which is the initial form of vitamin A so it is called pro vitamin A or provit A. Provit A is found in leafy green vegetables such as water spinach. The objectives of this study were: To compare the nutritional content of water spinach cultivated hydroponically and non-hydroponically. This research was conducted at the Wire House Biology Laboratory, Padang State University in May - July 2020. This research is a descriptive study. The analysis that will be carried out in this study are: Nutritional content of kale. The research steps that will be carried out are: preparation of hydroponic kale samples obtained from the West Sumatra hydroponic community in Alai and non-hydroponic kale obtained from the Padang Raya market, analysis of nutrient content using spectrophotometric methods and data analysis. From the research that has been done, it is found that the nutritional content of water spinach cultivated non-hydroponically is higher than that of water spinach cultivated hydroponically.
Stomata Characteristics of Ketapang Leaves (Terminalia catappa L.) Based on Environmental Differences
Authors: Des M , Vauzia  , Gusti Y S 
Published: June 2021

Abstract
Ketapang (Terminalia catappa L.) is a type of plant that is widely planted on the roadside of urban areas that functions as a green plant. The response from green plants exposed to pollutants originating from motorized vehicles can be seen from the leaf stomata. This study aimed to determine the characteristics of the stomata of Ketapang leaves in areas with different environmental conditions. The parameters observed were density and stomata distribution. The sample was taken in Bung Hatta Forest Park and on the edge of Prof. Dr. Hamka streets. Observation of stomata using preparations with replica or mold method. The results showed that there were significant differences in the stomata density of Ketapang leaves in both locations. Stomata density on Prof. Dr. Hamka street is higher than the Bung Hatta Forest Park. The average density of the stomata of Ketapang leaves in Bung Hatta Forest Park is 132738.09/mm2 while at the edge of Prof. Dr. Hamka street is 232142.85/mm2. The distribution of stomata of Ketapang leaves in both locations showed no difference, i.e. they were of the hypostomatic type (stomata were only found on the lower surface of leaves).
Optimization of Agricultural Waste Substrate as an Alternative Medium for Xylan in Producing Xylanase Enzymes by Thermophilic Bacteria
Authors: Irdawati I , Sofiyyana A , Advinda L , Fiffendy M , Salvia S , Syamsuardi S , Agustien A , Rilda Y , Yahya Y 
Published: June 2021

Abstract
Xylanase enzyme is a thermostable enzyme produced by thermophilic bacteria which in this study used Aneurinibacillus thermoaerophilus SSA2 isolates. Xylanase enzyme is able to hydrolyze xylan into xylose and xylooligosaccharides. The use of xylan in large quantities was very ineffective because of the high price and low production at this time, therefore it was necessary to find a cheaper substrate, derived from agricultural waste and potentially as an alternative to replace xylan. The purpose of this research was to find a replacable substrate of xylan from agricultural waste containing hemicellulose. Xylan of extraction results from some agricultural waste are mixed into the fermentation medium. Extraction results that produce the most optimum enzyme activity will be treated to find the optimum concentration of the substrate. This research is an experimental study using RAL, where each treatment has 5 replications. Data on the results of enzyme activity were further analyzed by ANOVA test and and continued with DMRT test at a significant level of 0,05. The results showed that the the results showed that the administration of agricultural waste substrate as a substitute for xylan affected the xylanase enzyme activity, were straw substrate had the highest average of enzyme activity at 6,033 Unit/mL and the husk substrate had the lowest average of enzyme activity at 5,667 Unit/mL. Substrate concentration had no significant effect on xylanase enzyme activity.