bluuebunny/crossref_metadata_2025 huggingface dataset:
The development of diffusion and osmosis practicum activities based on the practical work domain along with curriculum progresses in Indonesia
Authors: Giriyanti P , Supriatno B , Rustaman N Y
Published: March 2021

Some developments going on biology learning as long as curriculum progresses such as practical activities on diffusion and osmosis. The research aims to describe the characteristics of diffusion and osmosis practical design based on the student’s worksheet along with the development of the curriculum. The research method was descriptive. The samples used include eight student worksheets from different curriculums. Analysis indicators include the content, practical activities, and the construction of knowledge. Curriculum that used in the study began from the 2004 Standard-based Curriculum until 2013 Curriculum. Data analysis was conducted by scoring aspects of concepts, practices, and knowledge construction in student worksheets using the assessment rubric. The results show that the content of diffusion practicum and osmosis activities do not increase the percentage in line with the development of the curriculum (75.00%; 75.00%; 75.00%). The percentage was increase in practices (71.43%; 80.95%; 90.48%) and knowledge construction aspects (83.33%; 91.67%; 95.83%). Thus, it can be concluded that as the curriculum progresses, diffusion and osmosis activities do not develop in the essence of the content but on practical activities and knowledge constructions.
Improving student collaboration and critical thinking skills through ASICC model learning
Authors: Santoso A M , Primandiri P R , Zubaidah S , Amin M
Published: March 2021

Previous study at three leading high school in East Java have revealed that student’s higher order thinking skills are good but their collaboration skills are still low. This study was aimed to reveal the effect of implementation the ASICC problem-based learning model on student’s critical thinking and collaboration skills. The study included quasi-experimental research with a non-equivalent pre-post test control group design in second grade students in three leading high school in East Java. All instruments used are valid and reliable. Collaboration data that were normally and homogeneous were analyzed by t-test. The correlation between collaboration skills with critical thinking was analyzed with Pearson’s correlation. This study revealed that there were significant differences in student’s collaboration scores in the experimental and control classes. The ASICC class collaboration score is higher than the control class. There was a positive correlation between the ability of collaboration with critical thinking (r = 0.78). The ASICC learning model can be used as one of promising learning model to improve student collaboration skills and maintain critical thinking skills.
Improving students’ creative thinking skills through guided inquiry practicums learning with STEM approach
Authors: Adhiriyanthi S , Solihin H , Arifin M
Published: March 2021

The main purpose of this study was to improve students’ creative thinking skills through guided inquiry practicum learning with STEM approach. The method used in this study was a quasi-experimental with one group pre-test and post-test design. The sample of this study was 30 students from one of public senior high schools in the West Bandung Regency area. The instrument of this study was an essay for creative thinking skills. The test consisted of 11 questions with indicators of creative thinking skills according to Guilford, namely fluency, flexibility, originality and elaboration. The data were analysed by using n-gain scores and Wilcoxon Signed Rank Test. The result of this study showed that there was a significant difference between the pretest and posttest scores with p-value of 0.000 and the improvement of creative thinking skills on each indicator with n-gain scores was 0.73 for fluency (high), 0.34 for flexibility (medium), 0.03 for originality (low) and 0.19 for elaboration (low). All four indicators have improved even though the improved of originality and elaboration at a low criteria. This study suggested that the implementation of guided inquiry practicum learning with STEM approach could be used as an alternative for improving students’ creative thinking skills.
Development of interactive learning media based on guided inquiry in chemical equilibrium
Authors: Irwan I W , Aznam N
Published: March 2021

This research is aimed to develop an interactive learning media based on guided inquiry for Senior High School grade XI that can be used as an alternative media for teacher in chemistry instruction and it also can be used by students as learning source. The subject is students of class XI Exact 1 SMA Negeri 4 Pinrang with 33 students. The development of the interactive learning media refers to ADDIE model that consist of several phases: analysis, design, development, implementation and evaluation. This interactive learning media has been validated by validator and through limited trial and categorized as valid, effective and practical. The result showed that: (1) The average value of students learning achievement is 80 with class completeness is 87.88%; (2) The students gave positive response toward interactive learning media with percentage 93.94% which was included very good and the teachers also gave positive response with percentage 95.87% which was included very good. Therefore, it can be concluded that the interactive learning media can be used in chemistry instruction.
Case studies in improving students’ learning outcomes, is it effective?
Authors: Widiandari L A , Redhana I W
Published: March 2021

Chemistry learning that has been going on all this time is still monotonous, where the teacher explains the materials which are then followed by giving assignments. This learning has not been able to improve students’ learning outcomes effectively. The loading of case studies into chemistry textbooks is one of the efforts to improve students’ learning outcomes. This study aimed to describe the effectiveness of the case study-based chemistry learning textbook in improving students’ learning outcomes. The type of research carried out is a quasi-experiment. The population of this study was the eleventh-grade students of Natural Sciences at SMAN 6 Denpasar Bali. The samples were selected by cluster sampling technique to obtain a control group and an experimental group. Students in the control class were taught with the conventional chemistry learning textbook, while students in the experimental group were taught with the case study-based chemistry learning textbook. Data of students’ learning outcomes were collected by a test. Data were then analyzed by using statistics of analysis of covariance. The results of this study indicated that the case study-based chemistry learning textbook was more effective in improving the students’ learning outcomes than the conventional chemistry learning textbook.
Students’ attitude profile towards chemistry based on Research-Oriented Collaborative Inquiry Learning Model (REORCILEA)
Authors: Huda H B , Rohaeti E
Published: March 2021

Scientific attitude is one of the important attitudes that can support the learning of chemistry. Scientific attitude can make students more active in learning students will be more curious that is related to student achievement. The sample of this study is 66 senior high school students as participants who apply the Research-Oriented Collaborative Inquiry Learning model. The questionnaire was validated with person reliability item reliability and item fit in good category. The results showed that most students had scientific attitudes in the average and high categories. The most dominant aspect of scientific attitude is rationality and the lowest aspect is the suspend judgment. The learning model provides more experience for students and scientific attitude can improve for better learning achievment.
Developing creativity through STEM education
Authors: Sirajudin N , Suratno J , Pamuti
Published: March 2021

The problem faced in classroom learning was rarely a learning activity that was able to improve creative thinking skills consistently. Therefore, one of the alternatives to the learning activity that could be used as a tool for improving the basic skills needed in this century in Science, Technology, Engineering, and Mathematics (STEM) education. This study aimed to describe the effectiveness of the STEM learning model in improving the creative thinking skills of students. It was a quasi-experimental research with Posttest-Only Design with Nonequivalent Groups. Based on data analysis, there was an effect of STEM education on students’ creative thinking skills. Based on the research results obtained from students’ creativity varies between low and moderate and the answers to the creativity tests given show lower results than expected. STEM can be recommended as an alternative and approach in learning biology, especially in improving students’ creative thinking abilities. Creative thinking is important to everyone, because to proof of the truth of the formulation of an assessment can be encouraged by way of thinking.
Improving the performance of football assistant referee through video-based training
Authors: Nurcahya Y , Nurmansyah P , Rosdiana F , Stiadi D
Published: March 2021

This study aims to determine the effect of video-based training to improve the performance of football assistant referee. This study used an experimental method, involving 54 assistant referees who were divided into experimental and control groups. The result shows that the application of video-based training improved the performance of assistant referees. The assistant referees were able to analyze the various mistakes made every time they led a football match. It implies that variation in the training process using video technology is necessary to enhance the performance of football assistant referee.
Development of STREAM integrated astronomy as an enrichment teaching material for elementary students
Authors: Kurniawan DT , Maryanti S , Sukardi RR , Santi DPD
Published: March 2021

This study aims to develop STREAM (Science, Technology, Religion, Engineering, Art and Mathematics) integrated thematic learning material with the context of the ring solar eclipse material for elementary students. This type of research is Research and Development (RnD) using ADDIE research design. The experimental subjects used in this study were 40 students at third grade in one of the integrated Islamic elementary schools in Cirebon. Data were collected using interviews, questionnaires, and tests. The instruments used consist of assessment sheets for students, observation of learning implementation, and interviews. The technique for the data analysis was qualitative and quantitative. The results showed that the average value of the expert validation test was 80.12 with the category of “very good”, the results of the teacher’s response were 94.34 with the category of “very good”, and the results of the responses of the students were 90.12 with the category of “very good”. From these results, the development of STREAM integrated astronomy teaching materials for elementary school students was declared “feasible” and “effective” to use during the instruction.
STEM project-based learning on student’s STEM literacy: the case of teaching earth layer and disaster
Authors: Kartini F S , Widodo A , Winarno N
Published: March 2021

During this COVID-19 pandemic, Indonesia also threatened with natural disasters since it is located on the Pacific Ring of Fire. Therefore, future generations should be prepared to have STEM Literacy related to solve a real-world problem using their integrated science with technology, engineering, and mathematical knowledge. The aim of this study is to investigate the effect of STEM project-based learning on students’ STEM literacy in the earth layer and disaster topic. The research approach used was a pre-experiment method with one group pretest and posttest design. The instrument is multiple-choice questions. The population of this study is 7th grade student in Junior High School in Bandung, and the sample consists of 30 students chosen by convenience sampling technique. The result of normalized gain showed that there is an improvement of student‘s STEM Literacy by 0.47 categorized as a medium improvement. Technology literacy was the highest improvement, while science literacy, engineering literacy, and mathematical literacy gained medium improvement. STEM Project-Based Learning approach is recommended to improve students’ STEM literacy during this pandemic that needs to carried by online learning.
Developing application of automatic lamp control and monitoring system using internet of things
Authors: Atmaja Jaluna Febry Try , Sari Marti Widya , Ciptadi Prahenusa Wahyu
Published: March 2021

This research aims to build a prototype of an automated light control and monitoring system based on internet of things. This system controller uses Wemos D1 microcontroller with integrated ESP8266 Wi-Fi module, which functions to send and receive input data on the Internet of Things (IoT) platform, namely Firebase. Input devices in this system are in the form of two types of sensors namely the LDR sensor and the PIR sensor where the LDR sensor functions as a measure of light intensity and the PIR sensor functions as a detector of human motion in a room. This system uses 2 lamps as an output device, where the lamp is placed in a clear plastic box formed as a room. In room 1, the lamp will turn on if a human presence is detected. In room 2, the lamp will turn on if the room’s lighting conditions are dim or dark and a human presence is detected. In addition, the control and monitoring system of this lamp can also be controlled via the android application without a certain distance and only requires an internet connection.
Assistive Technology for the Disabilities in the Mitigation Training
Authors: Hidayat Luqman , Arwansyah Yanuar Bagas
Published: March 2021

Disaster mitigation must be understood by all parties, including persons with disabilities who are categorized as particularly vulnerable to disaster impacts. This paper aims to see the application of appropriate assistive technology for persons with disabilities in a disaster emergency in the setting of disaster training and simulations conducted at SLB Negeri 1 Bantul. The right and accessible technology will help and facilitate disabilities in coping with disasters. Engineering training materials and the use of assistive technology for disabilities are concise necessary, this is done to accommodate the types, characteristics, needs, and services of disabilities in disaster mitigation and simulation activities. This training using assistive technology is carried out for disabilities to accommodate all rights and improve the functions and independence of individuals with disabilities so that they have active participation in disaster mitigation and simulation activities.
Mind Mapping Based Mobile Learning System to Increase Student Creativity
Authors: Hartanto Supri , Permana Septian Aji , Pringgowijoyo Yitno
Published: March 2021

Authentic online learning is applied at pandemic corona as a strategy to reduce face-to-face in the learning process. The rise of use handphone, gave the idea to implement a mind mapping-based mobile learning system. This research aims to provide an overview of the need to improve student creativity by using mobile learning system-based learning. The study used the class action research method, using the Kemmis and Taggart models. The implementation of research has been conducted with two cycles through planning, implementation, observation, and reflection. The research object was 40 people consisting of 15 males and 25 women. The programs used in this study are using Microsoft PowerPoint, ISpring, and Website2apkbuilder. The research object is a student of Semester II Civics Education, University PGRI Yogyakarta validity of data using face validity. Based on the results of the study obtained data, the use of mind mapping by using the mobile learning system impacts increasing student creativity. It can be examined from the student creativity evaluation results on pre-research with the average value of 59.41 to 78.21 at Cycle 1, and at 2 increased back creativity to 82.03. Mind mapping based mobile learning can be an online learning alternative by giving the program integrated in one semester. This learning Program can reduce Internet quota use because it can be learned online through Android application.
Lost Space Utilization for Public Activities at Railway Crossing in Mejing and Sedayu Village, Yogyakarta
Authors: Widyaningsih Eka , Radiaswari  , Dani Adinda Rafika
Published: March 2021

Street and railways crossing is considered as an area prone to accidents, especially crossing areas without safety barriers. However, this vacant space attracts more visitors from its surrounding neighborhood area. At certain hours of the day people uses this space to interact, socialize, play, enjoying afternoon meal, or spend some pastime while train-watching from the rail sides. Street vendors also contribute to the crowding of the area. These space should be manage by public railway company. However in most suburban area, these space has been untouched. On the other hand, the needs for urban public space as a recreational place for people has not been facilitated. Thus careless utilization of lost space at street-railways crossing are commonly found. This phenomenon, creates a sprawl of unplanned-temporary public space. Observing the Mejing and Sedayu crossing, we might see the vibrant activities creates by locals, various type of users, and habitual time used of space.
Training Class Action Research, School Action Research and Writing of Scientific Articles for Teachers and Principals of Basic School in Banyuurip Purworejo
Authors: Setiawati Esti , Sunarti
Published: March 2021

This community service aims to help improve the ability of teachers and school principals in preparing classroom action research proposals, school action research, and writing scientific articles on research results. This community service is carried out through the virtual zoom meeting method with three stages of activities, namely: 1) providing classroom action research materials, arranging instruments, and compiling research reports; 2) provide material for school action research, preparation of instruments, and preparation of reports; 3) provide material for writing scientific articles in research journals. The first activity was attended by 20 teachers and school principals. The second activity was attended by 18 teachers and school principals, and the third activity was attended by 17 teachers and school principals. The training activities resulted in the following findings: 1) the understanding of teachers and principals in the preparation of classroom action research proposals improved; 2) the understanding of teachers and school principals in preparing school action research proposals improved; and 3) the understanding of teachers and principals in writing scientific articles has improved.
Improvement of Social Manufacturing Data Performance on Industry 4.0 Era
Authors: Nugrahani Tri Siwi , Safitri Harlina , Umam Sulkhanul , Grediani Evi
Published: March 2021

The Revolutionary Era 4.0 made it necessary for every company to pay attention to the value of performance responsibly which included several aspects of technology use with social manufacturing, profit, planet, and people with the triple bottom line concept. PROPER performance appraisal with the title Gold, Green, and Blue as the standard for companies that have carried out environmental care programs is a serious concern for companies to be included in that category. This study tested 10 mining companies listed on the IDX and listed in PROPER from 2013-2019 with a total of 70 observations. Methods of data analysis using Multinomial Logistic Regression. This study adds to the social evidence that manufacturing can improve PROPER performance, as well as the Triple Bottom Line (TBL) concept on the environment (planet), which can improve PROPER performance.
Markov Regime Switching-Garch Modeling On World Oil Prices
Authors: Dwipa N M S , Wicaksono B
Published: March 2021

This study aims to explain and test the performance of the best forecasting model for world oil prices. The world oil price is included in a time-series data type that has high volatility and different variants at each point in time. Precise and precise time-series modeling of this type of data is required to properly explain structural changes and explain any shift in volatility. The method that is applied and produces the best model in describing world oil prices is the Markov Regime Switching-GARCH. Modeling results can be used as alternative data for investor’s consideration for determining their investment decisions.
Utilization of NON B3 Waste as Learning Media in Online Class during the Pandemic
Authors: Harjana Ramdhan , Fatmawati Dwi Putri , Suminar Yulian Agus , Noormiyanto Faiz , Setianingsih Dwi , Hidayat Luqman
Published: March 2021

Covid-19 pandemic had a significant impact on many aspects of life, including in the world of education. Pandemic conditions make the learning process adapt to new conditions, one of which is changing the form of face-to-face learning into online learning. The online learning process for teachers at Special School (SLB) faces challenges in delivering learning materials to students with special needs, especially in using appropriate learning media. This article discusses the training provided to special school teachers in Yogyakarta to make learning media utilizing non-B-3 waste as a support for the online learning process for children with special needs. The method used is a qualitative method with data collection techniques using interviews, observation, and performance evaluation. The results of this study indicate that the training in making learning media based on non-B-3 waste is significant in helping teachers solve online classroom learning problems for children with special needs. The reason for choosing non-B-3 waste for learning media are easy to get, and teachers can make media according to students abilities and learning objectives.
Development of Ethno-mathematics based Mathematics Teaching Material Technology: A Needs Analysis
Authors: Sulistiyoningsih Astriani R , Utaminingsih Sri , Surachmi Sri
Published: March 2021

Ethno-mathematics based Mathematics teaching materials are combination of teaching materials that contain cultural elements associated with Mathematics subject content. This study aims to analyze the need for the development of ethno-mathematics-based mathematics teaching materials for fifth grade elementary school students. This research uses a qualitative approach with descriptive research type. The main data were obtained directly by the researcher through observation, interviews, and questionnaires. The research subjects were teachers and students of grade V SD 3 Temulus. The needs analysis activity begins with curriculum analysis (KI and KD), teacher and student analysis. Data were analyzed by reducing data, presenting data and drawing conclusions. The results showed that: (1) all materials in teaching materials were in accordance with the curriculum; (2) teachers and students need ethno-mathematic based teaching materials to find out about customs and culture in the surrounding environment. It can be concluded that ethno-mathematics based Mathematics teaching materials are needed by grade V SD students.
Development of Science Teaching Materials Based on STEM: A Needs Analysis
Authors: Sustiningsih  , Utaminingsih Sri , Santoso
Published: March 2021

Science learning with the STEM approach aims to prepare students to compete and be ready to work in their respective fields. The science learning process will run more optimally when maximizing all teaching materials that support students. The aim of this research is to analyze the need for the development of Class V science teaching materials. This research is a descriptive study conducted through observation, interviews, and distributing questionnaires to class V teachers and students of the Fatmawati Cluster, Batangan District. The findings of the study show that: 1) students do not understand the benefits of experimental activities they do in their daily life and tomorrow when they are adult 2) teaching materials do not integrate various science supporting disciplines. Based on the research data, it can be concluded that it is necessary to develop teaching materials in the form of STEM-based practicum manuals.
Needs analysis of picture story book using augmented reality technology
Authors: Suryani Yulita Ayu , Utaminingsih Sri , Madjdi Achmad Hilal
Published: March 2021

As early as 2014, a survey of smartphone and tablet use by children has been done by the Asian parent Insightwith Samsung Kidstime in Southeast Asia. A total of 2,714 parents and 3,917 children aged 3-8 years havebeen the respondents of this survey. 85% of parents expect their children to use smartphones for educationalapps, but 72% of younger children prefer to play games. This study aims to analyze the needs of students and teachers for picture books with characters based on Demak local wisdom with AR technology for understanding the healthy lifestyle of elementary school students. This research is preliminary research from research and development. The design of this research is to need analysis or survey research. Data collection through questionnaires. Data were analyzed quantitatively. The results showed that the development of a picture book containing characters based on the local wisdom of Demak using augmented reality technology is needed for understanding students’ healthy lifestyle.
The influence of think pair share model and crossword puzzle to increase primary school students’ mathematical learning interest
Authors: Rohman Taufiqur , Surachmi Sri , Murtono
Published: March 2021

The purpose of this research (1) Analyzing the influence of the Think Pair Share model on students’ learning interest in Mathematics at SD 2 Ngembalrejo Bae Kudus (2) Analyzing the influence of the crossword puzzle media on students’ learning interest in Mathematics at SD 4 Ngembalrejo Bae Kudus (3) Menganalisis Hasil Pengaruh model think pair share media crossword puzzle terhadap minat belajar siswa pada mata pelajaran Matematika at SD 5 Ngembalrejo Bae KudusThis type of research is included in the type of field research, namely research in which researchers go directly to the field to obtain data or information directly by visiting respondents. The method used is a quantitative method of data analysis with statistics. In this study, the authors conducted a field study at elementary schools in the village of Ng rejo. The population in this study consisted of Grade 5 students in three elementary schools, namely SD 2 Ngembalrejo, SD 4 Ngembalrejo and SD 5 Ngembalrejo by using simple random sampling technique. In this analysis, the authors used statistical analysis, namely simple regression and correlation.. The results showed that 1) Think Pair Share model on students’ learning interest in Mathematics at SD 2 Ngembalrejo Bae Kudus in a good category, is 51 in the interval range 43 - 49. 2) crossword puzzle media on students’ learning interest in Mathematics at SD 4 Ngembalrejo Bae Kudus in very good category, yairu 53 in the interval range 52 - 56. 3) There is a significant effect of the think pair share model and crossword puzzle media on students’ interest in learning mathematics at SD 5 Ngambatrejo Bae Kudus, with a regression equation Ŷ = 69.253 + 0.49 X. The Think Pair Share method with crossword puzzle media has a positive and significant amounting to 0.068 which is included in the strong category and can contribute to students in developing student interest in learning by 0.462%.
Analysis of 4C-Based HOTS Assessment Module on Critical Thinking Ability
Authors: Kurniawan Tigas Tri , Santoso  , Utaminingsih Sri
Published: March 2021

This study aims to analysis of 4C-based HOTS assessment module on critical thinking ability of sixth grade elementary school children. This research type is correlationalnon-experimental research with the form of ex post facto. The sampling technique used is the type of cluster random sampling. The data were obtained using a student and teacher response questionnaire. Data analysis using descriptive method. The results showed that 83,2% of students and 80% of teachers gave positive responses to the use of the 4C-based HOTS assessment module. Learning using the4C-based HOTS assessment module is more guiding students to think critically in solving problems.
Hollow electron lenses for beam collimation at the High-Luminosity Large Hadron Collider (HL-LHC)
Authors: Redaelli S. , Appleby R.B. , Bruce R. , Brüning O. , Kolehmainen A. , Ferlin G. , Foussat A. , Giovannozzi M. , Hermes P. , Mirarchi D. , Perini D. , Rossi A. , Stancari G.
Published: March 2021

Electrons lenses produce a high-intensity electron beam and
have a variety of applications to circular hadron
accelerators. Electron beams of different transverse cross sections
and distributions may be designed, depending on the desired
application, and they are produced and steered along the orbit of
the hadron beam, overlapping with it for typical distances of a few
meters before being deflected away and disposed of. Hollow electron
beams find applications to high-intensity beam collimation for
machines like the CERN Large Hadron Collider (LHC). Such devices
can be integrated in a collimation system to improve the
halo-cleaning performance through an active control of the halo
dynamics: the annular distribution of the electrons excites
resonantly the beam tails surrounding the beam core, while the core
itself remains unperturbed, as ideally it only “sees” the
field-free “hole” in the electron distribution. Hollow electron
lenses are part of the upgrade baseline of the High-Luminosity
project of the LHC (HL-LHC) and will be installed in the machine
during a long shutdown in 2025–2027 to mitigate effects from beam
losses so to improve the collimation system performance. This paper
describes the hollow electron lens project within the HL-LHC
collimation upgrade.
Self-consistent PIC simulations of ultimate space charge compensation with electron lenses
Authors: Stern E. , Alexahin Yu. , Burov A. , Shiltsev V.
Published: March 2021

Further progress of fundamental particle physics requires
high intensity and high brightness of accelerated proton and ion
beams. This goal is essential for the FAIR hadron beams at GSI, for
the neutrino production at the facilities such as Fermilab and
JPARC, and for the Large Hadron Collider luminosity at CERN. One of
the most formidable obstacles toward that goal is the beam's own
space charge, whose forces cause beam emittance growth, losses and
lifetime degradation. Typically, such effects become intolerable
when the space charge tune-shift parameter Δ QSC exceeds
∼ - (0.25–0.5). To reduce these detrimental effects, it
was suggested to use electron lenses to compensate the space charge
forces. This paper reports on detailed particle-in-cell space charge
and electron lens compensation simulations for extremely intense
proton bunches whose space charge tune-shift parameter exceeds
-1.0. Different scenarios were evaluated based on reduction in the
emittance growth and particle loss at a 4σ aperture. We
investigate phenomena and issues related to the focusing lattice
errors, importance of the transverse and longitudinal matching of
the electron beam profiles to the proton ones, and vary the strength
and the number of the electron lenses distributed around a circular
machine to optimize the reduction of harmful space charge effects.
Landau Damping with Electron Lenses in Space-Charge Dominated Beams
Authors: Alexahin Y. , Burov A. , Shiltsev V.
Published: March 2021

Further progress of fundamental physics requires accelerated
beams of high intensity. The intensities, however, are limited by
many factors, including coherent beam instabilities. Usual methods
to control the instabilities, such as octupole magnets, beam
feedback dampers and employment of chromatic effects, may be
ineffective or insufficient. Electron lenses were proposed as a
means to provide stabilizing spread in the beam betatron
frequencies. It was shown that electron lenses are uniquely
effective for Landau damping of transverse beam instabilities in
high energy particle accelerators, and that their employment does
not compromise incoherent (single particle) stability, dynamic
aperture and the beam lifetime. Here we consider effectiveness of
the Landau damping with electron lenses when the space charge tune
shift cannot be neglected. We demonstrate that the desired stability
can be assured with proper choice of the electron beam parameters
and current distributions.
On the possibility of footprint compression with one lens in nonlinear accelerator lattice
Authors: Danilov V. , Shiltsev V.
Published: March 2021

Electromagnetic interaction of colliding beams along with
other nonlinear fields often limits the beams' lifetimes and
luminosities. Nonlinearities result in the spread of betatron
frequencies (footprint) and, thus, may enhance dynamic diffusion of
particles due to high order resonances. One of the possible ways to
eliminate nonlinearities and overcome the corresponding difficulties
is compensation of nonlinear forces, but, in practice, it is hardly
possible to obtain exact linearity of the system. The compensation
with a single nonlinear lens cannot cope with distributed
nonlinearities, nonlinearities due to parasitic crossings, etc. In
the article, we present a method to compute parameters of nonlinear
element (lens) that eliminates both the footprint and resonance
strength without achieving full compensation.
Design of a compact, cryogen-free superconducting solenoid for the electron lens of the Fermilab Integrable Optics Test Accelerator (IOTA)
Authors: Dhuley R.C. , Boffo C. , Kashikhin V. , Kolehmainen A. , Perini D. , Stancari G.
Published: March 2021

The proposed electron lens for Fermilab's Integrable Optics
Test Accelerator (IOTA) will broaden its capabilities by enabling
new research in nonlinear integrable optics, space-charge
compensation, proton beam cooling, and more. The electron lens is
based on a 5–10 keV, 1–2 A electron beam, shaped using a 0.7 m
long, 0.8 T solenoidal magnetic field. A cryogen-free
superconducting solenoid has been designed to provide this
solenoidal field, taking into consideration the constraints on
space, utilities, and infrastructure in the IOTA experimental
hall. The solenoid is made of copper stabilized niobium-titanium
conductor, conduction-cooled using 4 K closed-cycle
cryocoolers. This paper describes the overall design of the solenoid
encompassing its mechanical construction, current leads
optimization, cryogenic thermal modeling that provides estimates of
cooldown time and static/dynamic heat loads, and quench analysis.
Analysis of the feasibility of Bali cattle breeding business in Barru Regency, South Sulawesi, Indonesia
Authors: Kusumastuti A , Indrawirawan  , Suwignyo B
Published: March 2021

The Indonesian Ministry of Agriculture legislates Barru Regency in South Sulawesi as a Bali cattle breeding. The purpose of this study calculates the feasibility of the Bali cattle breeding business. The research conducted in Tanete Riaja District, Barru Regency, South Sulawesi. The number of respondents is 75 farmers determined by purposive sampling. This study used survey methods and data collected by observation and interviews using a questionnaire. Primary data such as the characteristics of respondents, component and price of inputs and outputs. The feasibility analysis of the Bali cattle breeding business used the Net Present Value (NPV), Benefit-Cost Ratio (BCR), Internal Rate of Return (IRR), and Payback Period (PP). The results show the Bali cattle breeding business with average ownership of 3 cows and a five-years investment period is workable with an NPV value of IDR 9,099,674, BCR of 1.22, IRR of 16.85% and PP for 4.40 years.
Uptake capacity of zeolitic tuff from Gunungkidul, Indonesia for environmental and agriculture application
Authors: Budianta W
Published: March 2021

Zeolitic tuff samples from Gunungkidul Yogyakarta, Indonesia was investigated for mineralogical and chemical composition and its uptake capacity. Five zeolitic tuff samples were obtained from the field and measured for the mineralogical, chemical composition, and uptake capacity by XRD analysis, ICP AES, and BaCl2 method, respectively. The result of mineralogical composition showed that the mordenite type-zeolite was found as significant zeolite mineral, with percentages varying from 24.1% to 38.1% and with an average amount of 34,3%. Chemical analysis revealed that the mordenite contents influenced amounts of SiO2 ranging between 60.06% to 66.06% and Al2O3 from 12.12% to 13.57%, and this Si/Al ratio obtained. The measured uptake capacity or cation exchange capacity (CEC) value varies from 67 meq/100 g to 98 meq/100 g with an average value of 82,4 meq/100 g. The vary of these values most probably was influenced by the differences in the percentage of zeolite minerals and other mineral impurities. Mordenite type of zeolite is thought the most affected of the uptake capacity, while clay minerals contribute to a relatively small influence. The uptake capacity of the five zeolitic tuff studied showed positive correlations with the content of mordenite-type zeolite as well as with the total content of microporous minerals and Si/Al ratio. These materials could be an excellent material candidate in a wide range and scale of agricultural, and environmental applications.
DEM and land slope based method of RUSLE LS factor calculation for soil erosion assessment
Authors: Yudhistira A , Setyawan C , Ngadisih  , Tirtalistyani R
Published: March 2021

Soil erosion is one of the essential factors causing land degradation in tropical regions. The application of a model for soil erosion calculation enables a rapid assessment with a reliable result. The Revised Universal Soil Loss Equation (RUSLE) is the most used soil erosion model which can be applied under various climate conditions. This study was conducted to evaluate the performance of the Digital Elevation Model (DEM) and land slope-based method to estimate the RUSLE LS factor value for soil erosion calculation in the upstream of Progo Watershed Indonesia. Parameters of the RUSLE model including LS factor estimation in a DEM based were calculated by using a Geographic Information System (GIS) tool and presented in 30 meters grid size. RUSLE model validation was performed by using reference value from two different studies in Java Island, Indonesia. The result revealed that average soil erosion in the study area was 71.12 tons/ha/year based on the LS factor calculated by using DEM. Whereas, average soil erosion based on LS factor calculated by using land slope-based method was 438.68 tons/ha/year. According to the RUSLE model validation value, the RUSLE LS factor calculation by using DEM was more accurate than the LS factor calculated by using the land slope factor. This study provides a useful reference for soil erosion study particularly to develop methods for RUSLE model parameter assessment under different climate conditions.
The effect of hay alfalfa (Medicago sativa L.) supplementation in different basal feed on the feed intake (FI), body weight, and feed conversion ratio of hybrid ducks
Authors: Suwignyo B , Suryanto E , Samur S I N , Hanim C
Published: March 2021

This study was conducted to determine the effect of hay alfalfa supplementation (Medicago sativa L.) in different basal feeds on the feed intake (FI), live weight (LW), Feed Conversion Ratio (FCR), and income of Hybrid Duck. In vivo trial was conducted with 120 MA hybrid ducks (Mojosari x Alabio), based on completely randomized design (CRD). Three (3) treatments and 6 replications with each repetition consisted of 5ducks. The treatments were P1 = radom mixed feed, P2 = 90% radom mixed feed + 10% hay alfalfa and P3 = 90% alternative feed + 10% alfalfa hay. Feed was obtained in dry matter but offered as fed. Feed and drinking water was offered ad libitum. The observed variables included feed consumption, live weight, feed conversion ratio (FCR), and income over feed cost. The data obtained were analyzed with the application of Statistical Product for Service Solution (SPSS) version 22 and if there was significant differences in treatment it would be further tested using Duncan’s Multiple Range Test (DMRT). The results showed that 10% alfalfa supplementation in free mixed feeds and alternative feeds showed a significant effect (P <0.05) on the value of feed consumption, but not with the other variables. Based on these results it can be concluded that three type of feed has similar potential as feed for duck. However, radom mixed feed treatment with 10% alfalfa hay supplementation (P2) is the most optimum treatment among the other treatment feeds, due to the highest live weight income value.
The Effects of NaOH Treatment and Drying Method of the Protected Lemuru Fish Oil on In Vitro Fermentation Gas Production
Authors: Dewi R R , Kustantinah  , Muhlisin
Published: March 2021

This study was intended to examine the effect of a combination of different NaOH concentration treatments and drying methods on the in vitro total gas production. The materials used in this study were lemuru fish oil and the capsules were starch, caustic soda, CaCh, and the chemicals for in vitro gas test analysis. This study applied a Completely Randomized Design (CRD) on 3x2 factorial and 3 replications. The parameters observed in the experiment included the total gas production. The data in this study were tested using an analysis of variance and continued with the Duncan test. The results of this study indicated that there is no interaction between the different NaOH concentrations and the drying method on the total gas production. Based on these results, it can be concluded that the difference in the NaOH levels in lemuru fish oil and the drying method has no effect on the rumen fermentation. The gas production from fractions a, b, and a + b in the sun drying method was significantly higher than on the oven drying method.
Effect of addition cilembu sweet potato extract (Ipomoea batatas Cilembu) as a prebiotic source for the kinetics of fermentation and lactic acid production by Lactobacillus paracasei
Authors: Swithenia F , Bachruddin Z , Kurniawati A , Yusiati L M
Published: March 2021

This study aims to determine the fermentation kinetics ofLactobacillus paracaseiwith the addition ofCilembusweet potato extract as a prebiotic source. Research carried out by determining theKmconstant onL. paracaseigrowth by analyzing the decrease in the substrate.L. paracaseigrown into a defined medium with the addition of substrate with concentrations of 0.01%, 0.05%, 0.1%, and 0.2% and observed a substrate utilization at 0, 6, 18, and 24 hours with the total carbohydrate test using Anthrone.Km constantis reviewed by observing the pH levels, lactic acid production with the addition of substrates as much as 0,5Km(1%),Km(2%) and 1,5Km(3%). Substrate efficiency were calculated from lactic acid levels production for every concentration. Processing of research data will use a Completely Randomized Design (CRD), and if significant will continue with Duncan’s Multiple Range Test (DMRT) analysis. Based on the results obtained, 1,5Kmsubstrate concentration shows higher consumption of substrate, lower pH, and higher lactic acid compared to 1% and 2% substrate butKmconcentration shows higher substrate efficiency than 1,5Km
The Variability of Qualitative Traits in Promising Rice Lines
Authors: Aristya V E , Taryono  , Trisyono Y A , Mulyo J H
Published: March 2021

Rice is one of the world’s oldest important crops. Qualitative traits can be useful for the identification of promising rice lines. In this study, seventeen advance rice lines were evaluated for qualitative traits. This assessment was carried out to analyse the variability in genotypes, based on 49 important qualitative traits of rice. Data on morphological parameters was collected from each line at suitable phase of growth to check variation. Findings were recorded according to descriptors for rice. Dendrogram was constructed which divided all the genotypes into seventeen major clusters, each subdivided into smaller sub-clusters. The pattern of cluster based on qualitative traits revealed the wide genetic variation. A high level of genetic variability based on qualitative traits was observed in this study. The genetic improvement of the rice needs the availability of genetic variability in promising lines. Significant phenotypic information and these variability has potential to develop quality rice for future breeding programs.
Preliminary study on the fermentation medium of the black garlic production
Authors: Anoraga S B , Sari A R , Wikarta J , Sabarisman I
Published: March 2021

The present work shows the potential of the natural material which commonly used javanese to be applied as fermentation medium on black garlic production. Black garlic processed by conventional fermentation using rice cooker for 10, 15 and 20 days. Three materials were used as medium, such as bamboo chambers, clay chambers and alluminium foil. The quality parameters were weight loss, moisture content, and TDS (brix %). The experimental design used in this study was a Completely Randomized Design (CRD) with a single factor experiment. The measurement result was obtained by using ANOVA statistical analysis and further testing with the Duncan method in the SPSS program. Black garlic was processed using natural material like bamboo chamber (besek) and clay chamber (kendil) for fermentation medium have shown lower weight loss and higher total soluble solid (%brix) than modern method using alluminium foil. Natural material affected total soluble solid (%brix) of black garlic significantly (p < 0.05). TSS (%brix) increased during fermentation process whereas pH decreased from pH 6,1 to 3,6.
Nonlocal effective-medium theory for periodic multilayered metamaterials
Authors: Wen Zhengji , Xu Hao , Zhao Wenchao , Zhou Ziji , Li Xiaowen , Li Shimin , Zhou Jing , Sun Yan , Dai Ning , Hao Jiaming
Published: March 2021

Spatial-dispersion (nonlocal) effects are non-negligible in periodic multilayered metamaterials under certain specific conditions, which cannot be completely understood based on the local effective-medium theory, even though the metamaterials are constructed by deep subwavelength meta-atoms. Here, we present a simple yet robust effective-medium model for such media in which the nonlocal effects are properly considered. Our proposed nonlocal model is established by the analysis of the dispersion relation of the effective medium without any expansion-based approximation, which is applicable for description of the optical behavior of the multilayered metamaterials even under critical conditions, and works well for both TE and TM polarized waves. We believe our model will be a powerful tool for the investigation of electromagnetic nonlocality in the realm of metamaterials and subwavelength optics.