bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of application of realistic mathematics education (RME) approach to mathematical reasoning ability based on mathematics self efficacy of junior high school students in Pekanbaru
Authors: Zubaidah Amir MZ , Urrohmah Athik , Andriani Lies 
Published: February 2021

Abstract
This research was purposed tofind the differences on mathematic reasoning ability between students using Realistic Mathematics Education (RME) approach and those taught by direct learning derived from their self-efficacy. This research was an experimental research with factorial experimental design. The samples of this research were 66 students on 8th grade students at SMPIT Az-Zuhra Islamic School Pekanbaru on the material number pattern. Sampling technique was cluster random sampling. Data were collected with reasoning ability test, questionnaire self-efficacy.The research findings were: there was a difference on mathematic reasoning ability between students taught by using RME approach and those with Direct learning, there was a difference on mathematic reasoning ability among students having high, medium, and low self-efficacy, and there was no interaction between learning approach and self-efficacy toward student mathematic reasoning ability.
Petri Net Model and Max-Plus Algebra in Outpatient Care at Solo Peduli Clinic, Surakarta
Authors: Haneefa Ghooda Phateena Taqie , Siswanto  
Published: February 2021

Abstract
Patients come to SoloPeduli Clinic to get medical treatment. Medical treatment at SoloPeduli Clinic is divided into two parts namely outpatient and inpatient health services. Patients generally do not know how long it will take for service from arrival to discharge at the clinic. The queue flow is called a system, while the patients queuing at each service are called states, the number of states cannot be limited as health services must be available 24 hours a day. This issue includes a Discrete Event System which can be modeled with a Petri Net. Petri Net is a mathematical model that can be used to describe certain events in a Discrete Event System. In this research, service flow is modeled using Petri Net which is then represented in the form of a matrix. Coverability Tree was created to define life and deadlock. Scheduling is modeled using Max-Plus Algebra. Service times will be randomly selected to facilitate scheduling and length of service time.
Geographically Weighted Logistic Regression (GWLR) with Adaptive Gaussian Weighting Function in Human Development Index (HDI) in The Province of Central Java
Authors: Nur Indah Manfaati , Al Haris M. 
Published: February 2021

Abstract
The Human Development Index (HDI) is an indicator to measure the success of quality human life. Efforts to calculate HDI to the district/city level are very important, so a better understanding of local conditions is needed with more adequate data support for all districts/cities in Indonesia. Modelling of HDI in Central Java with the factors suspected to influence it is done by Geographically Weighted Logistic Regression (GWLR) with the Adaptive Gaussian Kernel weighting function. The analysis result shows that the deviance value is 32.3992, where the value is greater than the value of χ2 (0.1.4) table, which is 7.77943. So, there is at least one independent variable that significantly affects of HDI in Central Java. GWLR Model Parameter Testing Results with Adaptive Gaussian Kernel weighting function obtained factors that influence HDI in Central Java Province is health facilities.
Bibliometric Analysis Related to Mathematical Research through Database Dimensions
Authors: Suharso Putut , Setyowati Lis , Arifah Mufida Nur 
Published: February 2021

Abstract
A bibliometric study of the publication of research results and mathematical thinking at this time is needed to see the development of progress and trends that are happening. The purpose of this study is to conduct bibliometric research in online scientific publications. The research method uses quantitative studies from electronic information sources through the Dimension database. Data obtained from 2015-2019 from research results published in leading international journals. Data is processed using the Vosviewer application to create predetermined formulas and produce visualizations. The results of this study have described the number of publications that have been made through international journals, the distribution of titles in international journals, the types of publications produced, and the level of productivity of authors from the name of the institution. The results of the research are then carried out an analysis related to the trends that occur related to education policy in Indonesia in the obligation and culture of writing in scientific publications.
Construction fuzzy logic with curve shoulder in inference system mamdani
Authors: Putri Salsabila Naura , Saputro D R S 
Published: February 2021

Abstract

Fuzzy Logic is a popular methodology and widely used at cybernetics in developing software programs. Fuzzy logic is a logic which the truth values of variables any real number between 0 and 1 both are inclusive with the truth value shown through the membership function (curve). It is used to deal with the concept of partial truth, where the truth value may range between completely true or completely false. In general, fuzzy logic provides an inference structure that capable to match human reasoning which called an inference system. Fuzzy inference system Mamdani is the process of decision making based on fuzzy sets, fuzzy rules and fuzzy logic with Mamdani method (min-max). On Mamdani method, the fuzzy sets are obtained by taking the minimum value of the rule, then use it to modify the fuzzy region and apply it to the output with the operator OR (union). This paper concerns fuzzy logic construction with curve shoulder in inference system Mamdani. The result shows five steps that used to construct inference system Mamdani which are fuzzification, operator fuzzy logic, implication, aggregation, and defuzzification.
Construction of Hyperplane, Supporting Hyperplane, and Separating Hyperplane on ℝ
n
and Its Application
Authors: Hariyanto Susilo , Sumanto Y.D. , Udjiani Titi , Sagala Yuri C 
Published: February 2021

Abstract
Hyperplane, supporting hyperplane and separating hyperplane have been defined well in inner product space. These definitions are expressed in very general concept of space, so in its understanding it requires understanding the specific inner product space. It is difficult, so in this paper the definitions will be explained in the ℝ
n
space or Euclidean space, beginning with constructing all possible hyperplanes of a given convex set. From all the hyperplane constructions, they will be classified as supporting hyperplane or separating hyperplane. This understanding will be generalized in the case of convex set with point and with other convex set. To clarify this discussion, it is completed with several examples of the construction of the hyperplane in ℝ
n
. In addition, this paper will give some examples of the application of hyperplane construction in ℝ
n
in computing the distance between point and a convex set. The application will also be further discussed in a more general problem, namely the distance between two disjoint convex sets.
Determination of neutron image quality of compact collimator facility for non-destructive testing
Authors: Chulapakorn T. , Wonglee S. , Pornroongruengchok W. , Liamsuwan T. , Kotayee S. 
Published: February 2021

Neutron imaging, based on a digital-based detector system, was developed for non-destructive internal inspection at the Thai Research Reactor-1/Modification 1 (TRR-1/M1). Neutron activation analysis was employed to determine thermal-neutron flux at the imaging position. The facility provided flux of thermal neutrons at 2.5× 105 cm−2s−1. Several standard samples were used to evaluate the collimation ratio (L/D), resolution, and unsharpness for the current setup of neutron imaging. An analytical method was employed to determine image quality parameters to moderate neutron flux. The L/D ratio depends on the aperture size of the divergent collimator and can be amended by using appropriate sample shape, resulting in more accurate estimate of collimation parameters. Resolution and unsharpness for neutron tomography were 0.5 mm and 1 mm, respectively. Results suggested the possibility of evaluating image quality using samples with non-complex structure.
Volatile organic compounds as disease predictors in newborn infants: a systematic review
Authors: Course Christopher , Watkins W John , Müller Carsten T , Odd David , Kotecha Sailesh , Chakraborty Mallinath 
Published: February 2021

Abstract
Volatile organic compounds (VOCs) detected in human breath, urine, stool, sweat, saliva, and blood result from metabolic processes in the body during health or disease. Using sophisticated measurement systems, small amounts of these compounds can be detected in the above bodily fluids. Multiple studies in adults and children have shown the potential of these compounds to differentiate between healthy individuals and patients by detecting profiles of compounds in non-invasively collected samples. However, the detection of biomarkers in VOCs from neonates is particularly attractive due to the non-invasive nature of its approach, and its ability to track disease progress by longitudinal sampling. In this work we have reviewed the literature on the use of VOCs in neonates and identified areas for future work. Overview of VOCs and their usefulness as metabolic signatures. Detailed review of studies on VOCs in neonates Learn about potential uses of VOCs as derived from adult and paediatric studies. Examine current limitations and identify future work. Detailed studies on VOCs involving neonatal patients including sick preterm infants and term infants with specific morbidities are needed. These studies should collect longitudinal samples using non-invasive methods for the detection of potential biomarkers. Underlying metabolic processes need to be identified so that any therapeutic options can be clarified.
Organic fertilizer from agricultural waste: determination of phosphorus content using near infrared reflectance
Authors: Devianti D , Yusmanizar Y , Syakur S , Munawar A A , Yunus Y 
Published: February 2021

Abstract
Agricultural waste can be converted onto useful materials like compost or organic fertilizers. In a simply practice, those wastes were kept and mixed with additional composting materials to enrich the fertilizer nutrients and compositions. Generally, plants can growth optimally in sufficient media, that is soil. It requires adequate micro and macro nutrients like phosphorus (P). in order to determine P content and other nutrient properties, many methods have been widely used from which most of them are wet chemical analysis. The main aim of this present study is to employ the near infrared reflectance (NIRS) technique in determining P content of organic fertilizer. Spectra data were generated in wavenumbers 5000 – 10 000 cm−1 and the model were established using principal component regression (PCR) method. The results showed that P content of compost materials can be determined using NIRS with maximum correlation coefficient 0.99 and robustness index 4.14 respectively.
A comparative study on integration of courtyard in creating environmental sustainability space for eclectic buildings
Authors: Safar Farhana Binti , Raman Noor Azah Binti Abdul , Sulaiman Siti Nazwin Izani Binti 
Published: February 2021

Abstract
Buildings are categorised into various types such as residential, educational, assembly and etc. This paper is described one type of assembly building namely mosque and its elements. The mosque is comprising of several elements such as courtyard, prayer hall, arcades, minaret, dome, the ablution rooms and toilets. It should be designed to accommodate the worshipper to feel comfortable and humble in the presence of God while performing the ‘solah’. In tropical region, especially in Malaysia; the existence of the courtyard in traditional mosques is still questionable whether it has fully considered the environmental benefits or it is simply a trend adopted from the Middle East. Previous studies have found that the purpose of having a courtyard inside a mosque is either for spatial reasons or it may be negligible. Hence, this study is conducted to understand the courtyard in a specificity of architectural style and the effects on spatial organization in traditional mosque design. The observation methods are used at the fieldwork in selected traditional mosques. From the observation two types of building indicator of space and form are identified for better understanding of courtyard characteristics of selected traditional mosques.
Load current, dropped voltage and size considerations in LDR based light control system
Authors: Candra R A , Suherman S , Siregar Y 
Published: February 2021

Abstract
Energy consumptions are dominated by lighting and air conditioning. Automatic controlling is the solution as human awareness is unreliable. Lighting and air conditioning can be automatically controlled by employing light sensor as well as human existence sensor. Light bulb and street lighting have been widely equipped by light sensor such as the light dependence resistor (LDR). LDR sensor circuit can be made transformer less and transformer based. Transformer less LDR circuit can be integrated into light bulb while transformer based LDR circuit is designed as a standalone device. This paper examines power consumption, load current and circuit size of both LDR circuits. Experiments show that transformer less LDR circuit consumes higher power with limited load current. However, its size is smaller. On the other hand, transformer based LDR circuit consumes less power and provides larger load current. But the challenge is the transformer size to overpower the transformer less circuit.
Signal jammer reduces wireless fidelity network and global system in local environment
Authors: Yunan A , Satria E , Ilham D N , Anugreni F , Khairuman K , Sandra S 
Published: February 2021

Abstract
Cellular networks are a way of long distance communication without the use of cables, this system is a modern style of communication that was previously communication using a landline-based telephone. Cell phones (cellphones) or cell phones (cellphones) are electronic-based telecommunications devices that have the exact same basis as telephone telecommunications devices using cables or wireless wireless. The use of cellular or wireless phones is very useful, but in certain conditions their use can be limited because it can interfere with people around him such as the implementation of worship, examinations, meetings and so forth. To answer complaints about how to reduce cell phone and wireless signals, a tool that is able to deactivate GSM and Wi-fi cell phone signals at certain radii will use a jammer, a device that works by emitting full noise signals at 900 MHz frequency banks, 1800 MHz and 2700 MHz, so that the communication device cannot be used until the time limit and the distance of the radius that reaches the communication device. The results of this study have been successfully carried out by deactivating cell phone and wireless signals at a maximum distance of 7 meters from the jammer.
Performance test of vertical dryer hybrid for drying Tuna fish
Authors: Nurba D , Mustaqimah M , Fadhil R , Darmansyah D , Fajri M 
Published: February 2021

Abstract
Drying is the stage of processing tuna to extend the fish's shelf life until it is consumed. In general, fishers are drying the processed salted fish under direct sunlight. During the rainy season, conventional drying under the sun is impossible to inhibit the drying process; therefore, a mechanical dryer is needed. A greenhouse dehydrator (GHE) using a combination of solar and biomass energy is the right choice. The purpose of this study was to test the performance of the Vertical Dryer Hybrid to dry tuna. Drying is done by placing the tuna sample on four drying racks, then observing the moisture content, air humidity, solar irradiation, and the use of biomass energy. During 35 hours of observation, the GHE Vertical Dryer reduced the water content of tuna from 70.8% to 13.3% initial water content with average solar irradiation of 280.2 W / m2. The dryer's highest temperature during the drying process is 67°C, with an average of 46.7°C. The highest temperature in the environment is 37°C, with an average of 33.3°C. The highest RH in the dryer during the drying process is a 75% average of 43.8%, the highest RH in the environment is 79%, with 61.2%. The full use of bio-charcoal during drying is 5.5 kg, with the amount of energy obtained is 155.87 MJ, and the total solar energy obtained is 88.613 MJ with a total energy total of 244.49 MJ.
Threat of ecology aspect towards people’s cocoa plantations management sustainability at Aceh Timur Regency
Authors: Mulyani C , Iswahyudi  , Juanda B R 
Published: February 2021

Abstract
Cocoa plantations at Aceh Timur regency face many problems in its management. Currently, there is not yet existing condition data of cocoa plantations so that it becomes obstacles in management to achieve cocoa plantations sustainibilility. This research is aim to identify key factors of ecology aspect impact towards plantations management sustainability of people’s cocoa at Aceh Timur Regency. The method used in this study is to intergrate descriptive qualitative approach, quantitatif and analysis system Rap-kakaoatim approach constitutes modification of Multidimensional Scalling (MDS). MDS utilized to assess sustainability status indexs and key factors that give lack influence of sustainability in people’s cocoa plantations management. The analysis result shows that status people’s cocoa plantations management is lack of sustainability by ecology dimension and institutional, from the side of economy is adequate sustainability, and with socio cultural dimension is extremely sustainable. From ecology dimension, key factor that influence people’s cocoa plantations sustainability are cocoa plantations rejuvenation, shade plantations and HPT attack. Those three factors are able to give positive effect towards cocoa plantations production if its condition inclines however on the contrary it can decline cocoa plantation production if its existence decreases. To intensify sustainability indexs of ecology aspect can be carried out by insentive distribution to the farmers of cocoa and Field School Program PHT (SLPHT) for controlling HPT.
Utilization of waste from refined lemongrass for producing mosquito repellent
Authors: Rusnanda R , Ramadhini M , Putra W S , Asmaidi  
Published: February 2021

Abstract
Because of its geographical location, South Aceh Regency has many natural resources, one of which is fragrant lemongrass. As it is known, citronella is processed and produced into essential oils. In the production process, waste is produced in the form of solid waste and liquid waste. Usually, the waste is left and becomes a problem for the environment around the distillery. The purpose of this study was to make a mosquito repellent by utilizing citronella processing waste. This research is using the experimental method. This experimental method examines the effect of certain treatments on others under certain conditions. Three samples will be tested for combustion. The results of this study from each sample with a variable initial burning time. The first test kills mosquitoes. The durability of mosquito repellent is sample 3 is the best sample for making mosquito repellent from the use of citronella distillation waste seen from the burn test. The conclusion from this study, the waste produced by citronella distillation can be used as a basic ingredient in making mosquito repellent because there are active compounds contained in citronella waste capable of killing mosquitoes.
Filter impact based on inverter circuit performances
Authors: Hardisal  , Candra R A , Ilham D N , Suherman S , Yunan A , Saragi D P , Harahap R , Irwansyah  
Published: February 2021

Abstract
This paper examines filter component impact on inverter output. The inverter prototype was designed by using pulse width modulation (PWM) signal generated by EGS002 module, combined with DC voltage source, voltage regulator, MOSFET Bridge and low pass filter. As component assembled, the output voltage quality is determined by the choice of filter components. Experiment shows that the calculated values may not suitable as soldering and connection imperfection may change component values. As adjustments were performed, filter components of 12.63 H and 6.5uf generated the finest sinusoidal output of 30.8 Vpp with frequency of 50.05 Hz.
The application of different mulches and its effect on soybean yield
Authors: Hasanuddin  , Hafsah S , Nurahmi E , Hayati E , Migawati S W , Bobihoe J , Aryani D S 
Published: February 2021

Abstract
Mulching is known as a great suppressant, a modern agricultural practise. It modifies the soil microenvironment and maintains crop yield. This study was conducted in January to April 2019 to investigate the effectiveness of several plants for mulch in various doses on soybean crop and to evaluate their effect to soybean yield. This study employed Randomized Completely Block Design (RCBD) Factorial with two factors. The first factor was 3 different plants applied for soil mulching: mexican sunflower (Tithonia diversifolia), siam weed (Chromolaena odorata) and neem (Azadirachta indica). The second factor was 4 different doses of mulch: 0, 8, 16 and 24 tons ha−1. Variables observed were number of pods per plant, number of seeds per plant, seed weight per plant, and yield of dry seeds. The results indicated that the application of different mulches did not have effect on all variables observed. However, the application of 16 - 24 tons mulch ha−1 has improved the number of pods per plant and yield of dry seeds. There was no interaction between plant types for mulching and dose of mulch in all variables observed.
Off-site domestic wastewater management system in Banda Aceh, Indonesia: the problems and future solutions concept
Authors: Harahap J , Gunawan T , Suparayogi S , Widyastuti M 
Published: February 2021

Abstract
Currently, Banda Aceh has been dealing with several problems related to pollution caused by domestic wastewater. According to previous studies, shallow groundwater and surface water in Banda Aceh have been contaminated by domestic wastewater produced by the community. The settlement scale off-site system with communal-WWTP operating in several villages has not function optimally in treating domestic wastewater. The problem also caused by service coverage which is still very small (only 2.12% of the total population). Therefore, it is require an acceleration of service improvement, by developing urban scale off-site system with centralized-WWTP and a wider pipe line network system. Moreover, further investigations are needed to develop the concept of planning as a preliminary design in the management of urban scale off-site system. This paper aims to develop a concept of domestic wastewater management using an urban scale off-site system that considers environmental characteristics in Banda Aceh as an alternative to mitigate the occurrence of water body pollution by domestic wastewater.