bluuebunny/crossref_metadata_2025 huggingface dataset:
Absolute frequency measurement of the 1S0–3P0 transition of 171Yb with a link to international atomic time
Authors: Pizzocaro Marco , Bregolin Filippo , Barbieri Piero , Rauf Benjamin , Levi Filippo , Calonico Davide
Published: October 2019

We report the absolute frequency measurement of the unperturbed optical clock transition 1S0–3P0 in 171Yb performed with an optical lattice frequency standard. Traceability to the International System of Units is provided by a link to International Atomic Time. The measurement result is 518 295 836 590 863.61(13) Hz with a relative standard uncertainty of

, obtained operating our 171Yb optical frequency standard intermittently for 5 months. The 171Yb optical frequency standard contributes with a systematic uncertainty of

.
Developing the Astronomy and Architecture Unit for Providing Students’ Perception of the Relationship between Science, Technology, Engineering, and Mathematics
Authors: Anantasook Russana , Anantasook Sakanan , Yuenyong Chokchai
Published: October 2019

STEM education suggested that students should be enhanced to learn astronomy with integration between Science, Technology, Engineering and Mathematics. To help Thai students make sense of STEM education in astronomy learning, this paper presents learning activities of the Socio-cultural astronomy and architecture Unit. The developing of the Socio-cultural astronomy and architecture Unit is a part of research that aimed to enhance students’ perception of the relationship between Science, Technology, Engineering, and Mathematics. This paper will discuss how to develop the astronomy and architecture Unit through Socio-cultural approach that regarding sociocultural perspective into 5 stages. These included (1) Engagement, (2) Investigation, (3) Discussion and conclusion, (3) Create production understanding, and (5) Learning community reflection. The learning activities could be highlighted as following. First stage, students focus on various religious buildings in the ancient time that built like a solar calendar structure. Then, they give opinions in this issue; (1) How to build a solar calendar for identify true season in your district? (2) Why do not build a house perpendicular the Sun’s pathway? Second stage, students used Stellarium astronomical program to find the position of sunrise or sunset in each month. Then, study about the details of buildings in various global civilizations which aims to astronomical observations and create activities in relation to true seasons. Third stage, each student group conclude these ideas; the principles for building place like a solar calendar, building house and set the room activity that concern with the Sun’s pathway and saving energy in their house. Fourth stage, students was assigned to create a model of the solar calendar in their district. The model should relationship with the sunrise or sunset position in important astronomy dates, support astronomical observations, and become landmark for tourism. Finally, each group presented their model to the committee and then, wrote committee’s reflection, and their opinions. The paper may have implications for developing astronomy teaching with STEM education.
Improving Thai Science Teachers’ TPACK through an Innovative Continuing Professional Development Program
Authors: Chatmaneerungcharoen S.
Published: October 2019

This study focuses on teaching and learning development in science through collaboration between science cooperative teachers and researchers. At the main goal was the ambition to integrate coaching strategy into internship course—with teaching practice, aligned with professional development on teacher’s technological pedagogical content knowledge (TPACK). The phase where the collaboration moves from initial establishment towards a stable practice is investigated. The study aims to identifying the character of professional program with specific questions are “How does professional development program was identified as actions and arrangements impacting the development of teacher’s TPACK and their emerging practice?” and “How does the teachers’ TPACK change?” Therefore, the study focuses on developing 40 Cooperative Science teachers who were science cooperative teachers that participated in this study for 1 year. Data sources throughout the research project consisted of teacher refection, classroom observations, Semi-structure interviews, Situation interview, questionnaires and document analysis. Interpretivist framework was used to analyze the data. Research findings indicate that STEM Education Professional Development Model: STEMed-PD which was developed on the frameworks of coaching and mentoring, lesson study, after action reflection and professional development community can enhance the cooperative science teachers’ understanding and practice on STEM lessons. These teachers conducted their classrooms with integrated science concept to other subject concepts. The lesson’s learning objectives are related to the 11st century skills that encouraged students to apply their knowledge into their daily life. Different from the beginning, the teachers understand only the meaning of STEM Education but they do not know how to integrate STEM into their science classrooms and they thought STEM lesson should be taught through Science Camp, not in normal classroom. For 1 year of STEMed-PD progression, both Science cooperative teachers and their student teachers have shown their development of STEM understanding and practice in aspects of STEM definition, STEM background, learning goals based on STEM and the 11st century skills, STEM lesson plan development, classroom practice with STEM lesson, connecting STEM lesson into student’s daily life, and evaluation and assessment of STEM classroom. The development of teachers’ understanding and practice is presented in their lesson plans that are produced during STEMed-PD. Moreover, the study also indicates the importance of co-working between cooperative science teachers and university supervisors in lesson preparation through coaching and mentoring. Implication for further research, science educators should focus on teacher self-efficiency and teacher’s background in technology knowledge which are factors to support or obstruct science teachers to develop their STEM practices.
Efficiency and Effectiveness of Universal Indicator from Native Plants in South of Thailand
Authors: Sampim Tatcha , Phupa Salinkarn , Sampim Supitcha
Published: October 2019

A chemical universal indicator is generally the device of acid base indicator. But there are some limitations like environmental pollution, availability, and higher cost which lead to search for natural compounds as an acid base indicator was started. To solve these limitations based on STEM theory, the universal indicator from native plants in South of Thailand such as Melastoma, Phae, Mulberry, Sweet potato, Kuuam, Blue pea, Pandanus palm, Turmeric, and Roselle was developed to a useful pH indicator device. The objectives of this research are to compare the native plants colour extraction of the solution between distilled water and 95 % of ethanol solution, to identify the stable and clear colour drying paper, and to analyse efficiency and effectiveness of the universal indicator from native plants. The results showed that all of native plant can be extracted by ethanol solution 95 percent. There are six stable and clear colour paper including Melastoma, Phae, Mulberry, Blue pea, Turmeric, and Roselle that can be made to the universal indicator from native plants. The resolution efficiency can be divided the pH measurement into 7 ranges: 1-2, 3-4, 5-6, 7, 8-11, 12, 13-14. The 30 randomly effectiveness tests of the universal indicator from native plants has 100 percent of accuracy.
The development of geography teacher training curriculum at Thai Nguyen university of education in Vietnam to meet the requirements in the new context
Authors: Mai Nguyen Thanh , Giang Pham Huong
Published: October 2019

The development of higher education curriculum plays an important role in ensuring the quality of human resource training to meet the requirements of socio-economic development. Curriculum development at Thai Nguyen University of Education in Vietnam, especially the Geography teacher training curriculum, which is regularly reviewed and changed to respond the needs of the labor market and fit in the new context nowadays.
Teaching and Learning about Magnetic field and Electromagnetic Induction Phenomena integrated Science, Technology, Engineering and Mathematics (STEM) Education in Vietnamese high schools
Authors: Bao Thai Quoc , Khoa Cao Tien , Ngoc Ngo Tuan , Thu Ha Nguyen Thi , Hoan Vo Quang , Quang Pham Hong , Ha Chu Viet
Published: October 2019

This work presents the study on teaching and learning about magnetic and electromagnetic induction phenomena integrated science, technology, engineering and mathematics (STEM) education in Vietnamese high schools for addressing issues of relevance and epistemic practice. We have explored STEM education with the creative and experiential activity in magnetic and electromagnetic induction phenomena. The STEM experiments and technical toys about magnetic and electromagnetic induction phenomena have been designed to be applied for active learning for students. The integration of STEM education will increase motivation and achievement in physics subjects and enhance capacity to improve student learning.
Assessment of learning progression on mathematical problem solving of students using open approach
Authors: Marwiang Metta , Dechdan Kitipat , Sunyalak Chakkrit , Junpeng Putcharee
Published: October 2019

The purpose of this research was to assess the progress of mathematical problem solving skills of students at Bannamphrae School in Chiang Mai in which the Open Approach was employed for class management. This research study was a quantitative research. The scope of the study included 23 fifth-grade students at Bannamphrae School in Chiang Mai, who had been selected through the purposive random sampling from the population covering 520 students in total. All of the students were in the fifth to sixth grades and were from 18 schools nationwide, which were participating in the Project on Advanced-Thinking Skills Development on Mathematics in the Northeast. The instrument used in the study was the mathematics problem solving test, which was comprised of 6 main items and 9 minor items. The data was analyzed via Conquest 2.0 software to discover the progress of their mathematical problem solving abilities through the developed framework of learning progress including 4 levels ranging from 0 to 3. The research revealed that the students at Bannamphrae School had shown different levels of progress with respect to mathematics problem solving as follows: 10 students were at Level 0 (Need Improvement), 6 students at Level 1 (Fair), 2 students at Level 2 (Good), and 6 students were at Level 3 (Very Good).
The Framework Development for Interpretation Of Students Reading Literacy In Teaching And Learning Through Open Approach
Authors: Lahnwong Chayanit
Published: October 2019

The PISA 2000, PISA 2003 and PISA 2006 scores indicate that Thai students have read ability level 2 and 1. Students are able to read and read the text only when the text is readable. Can be referenced or compared or linked to what has been known at low levels. Assess and analyze at a basic level, linking the readings to the things that are related to their lives. No reference or comparison can be made if further analysis is required. This paper comprehensively Reading literacy includes the ability to extract the relevant information from texts and also to understand, use and reflect on written texts. The ability and incentive to engage with texts and address their content is also examined. In order to measure the diverse dimensions of reading literacy, in PISA it is defined as a complex competency with multiple facets. The exercises therefore include different situations and text formats. Solving reading exercises also calls for various cognitive processes of reading. A new feature of the 2018 PISA study is interactive exercises with several texts to be read in a simulated web environment. Aspects of reading literacy in the digital age are thus examined, including the ability to find, relate and assess information. This framework incorporates two approaches: 1) promoting students Reading Literacy instructions; and 2) and Learning through Open Approach. The teaching about problem solving process which students can be improved the cognitive skill and develop several skills of students in the reasonal thinking, creative thinking, analyzed thinking, self-study and systematically problem solving ability. However, this framework emphasizes which grade 9 students in Demonstration School of Khonkaen University, Thailand.
Grade 11 Student’s Mental Model of Fluid and Analytical Thinking in Science Teaching Through Science Technology and Society (STS) Approach
Authors: Nongkhunsarn Amorn , Yuenyong Chokchai , Tupsai Jiraporn , Sranamkam Tawee
Published: October 2019

This study reported Grade 11 student’s mental model of fluid and analytical thinking in science teaching through science technology and society (STS) approach. The participants were 38 Grade 11 students in Moeiwadee, Roi-et, Thailand. The teaching and learning about fluid through science technology and society (STS) approach had carried out for 12 hours. The fluid through STS approach was developed based on framework of Yuenyong (2006). Students’ mental model of fluid and analytical thinking were collected during their learning by participant observation, open questionnaire, semi-structured interview, student’ task, analytical thinking test, and journal writing. The findings revealed that students’ mental model of fluid were represented as verbal, equation, drawing. Data were analyzed identify patterns that offer insight into aspects of student understanding and discussed in the scientific concept. The student’s analytical thinking could behave the characteristics for analytical thinking such as thinking for classifying, compare, contrast, reasoning, interpreting, collecting data and decision making. This study will discuss implication of these for science teaching and learning through STS in Thailand.
Development of an Interactive Module Incorporating Financial Literacy in Teaching Decimals/Fraction
Authors: Rondillas Fhelmar I. , Buan Amelia T.
Published: October 2019

This study sought to develop an interactive module incorporating financial literacy in teaching fraction and decimals for Grade 7 Mathematics. This study used pretest-posttest one-group design with qualitative support to distinguish the effect of the interactive module on students conceptual understanding, financial literacy and motivation to achieve. Based on the quantitative and qualitative analyses of the study, there was a significant improvement in the students’ pre-test and post-test scores on conceptual understanding, financial literacy and motivation to achieve. Results also showed that students were able to understanding the concept of fractions and decimals; see application of fraction and decimals into different fields and most specially its connection to financial literacy. In addition, students realized the importance of savings and budgeting, and even became financially wise. The developed interactive modules incorporating financial literacy were integrated with interactive websites, financial literacy videos, and online assessments. The researcher recommends the use of the interactive module incorporating financial literacy in secondary mathematics classes to facilitate the learning process in teaching fractions and decimals. Also, similar interactive modules incorporating any real life skills must be developed.
Students’ Applying STEM Knowledge in Learning on the STS-STEM Education Wave Learning Unit
Authors: Tupsai Jiraporn , Bunprom Somsak , Saysang Janjira , Yuenyong Chokchai
Published: October 2019

This study aims to explore Grade 11 activity of student on Science Technology Engineering Mathematics (STEM) with the integration of learning about wave based on Science Technology Society (STS) approach [8]. The participants were 50 students in Demonstration Secondary School, Khon Kaen University, Khon Kaen Province, Thailand. The methodology is in the respect of interpretive paradigm. The teaching and learning about wave through STS approach carried out over 5 weeks. The Wave unit through STS approach was developed based on framework that consists of five stages including (1) identification of social issues, (2) identification of potential solutions, (3) need for knowledge, (4) decision making, and (5) socialization stage. To start with, the question “How to change wave energy to electricity” was challenged in the class in order to improve students to find the problem of how to design wave energy to electricity from Clean Energy form force wave. Students were accepted to apply scientific and other knowledge to design of wave energy to electricity. Activity of students on STEM were collected during their learning by participant’ observation and students’ tasks. Them did on STEM were classified when they applied their knowledge for designing the wave energy to electricity. The findings indicated that students cooperatively work to solve the problem when applying knowledge about the content of Science and Mathematics and processing skill of Technology and Engineering. It showed activity that students held the integration of science, technology, engineering and mathematics to design their possible solutions in learning about wave energy to electricity. The paper also discusses implications for science teaching and learning through STS in Thailand.
Development of webquest using Google Site in teaching Circulatory System
Authors: Agad Lea May L. , Pitonang Daryl Jean A. , Terrado Tyra Faye , Salic-Hairulla Monera A. , Gomez Rizalina G. , Nabua Edna B. , Yuenyong Chokchai
Published: October 2019

This study aimed to develop a webquest in teaching circulatory system using Google site for Grade VI pupils. The developed webquest was an instructional material designed to enhance pupil’s performance in engaging learning activities especially in science lessons based from the K-12 Science Curriculum. The developed webquest was evaluated and rated Excellent by the ICT Experts, In-Service Teachers and Pre-Service Teachers. The comments and suggestions were used to improve the developed webquest. The researchers also made use of the Flesh-Kencaid Readablity Test to determine the readability of the developed webquest and the results revealed that it is appropriate for Grade VI pupils.
Implementation of Webquest in teaching Circulatory System
Authors: Salic-Hairulla Monera A. , Agad Lea May L. , Pitonang Daryl Jean A. , Terrado Tyra Faye , Yuenyong Chokchai
Published: October 2019

This study aimed to determine the performance of the respondents in using the developed Webquest in the Google site. The study used the quasi-experimental design method making use of pretest-posttest design. The result of the study showed that there was a significant improvement in the respondents’ conceptual understanding in the concept of Circulatory System. The respondents exposed to the developed webquest had significant high test scores in the post-test as compared to the pre-test. The developed instruction was implemented to 30 Grade 6 Elementary pupils and another 30 pupils for traditional lecture method from selected public schools who were enrolled during the SY 2016 - 2017. Moreover, the result also showed that there is a significant difference between the post test scores of control group and experimental group. Result implies that the developed Webquest has a positive impact in teaching Circulatory System.
Meta-analytic review of studies on the effectiveness of chemistry teaching methods on student transformation
Authors: Sugano Shalom Grace C. , Nabua Edna B. , Barquilla Manuel B. , Buan Amelia T. , Inutan Ellen N.
Published: October 2019

In the hope to provide life-long and quality learning in chemistry education in the Philippines, quality of instruction must be guaranteed first. This calls for exploration and utilization of teaching methods that effectively promote student growth and learning success. In an effort to this, this study utilized the quantitative meta-analysis technique to integrate chemistry research findings that were conducted only in the Philippines covering the period 2005-2016. It aimed to investigate the effectiveness of teaching methodologies in secondary chemistry and their effects on student transformation consisting academic performance and student characteristics. A search procedure and broad literature review were executed in order to identify the potential and qualified chemistry studies from published and unpublished graduate theses, dissertations and journal articles. Meta-analysis was effectively and systematically carried out through study acquisition, study coding, determination of interrater reliability, establishing inclusion criteria, computation of effect size including mean and interpretation of analyses. The meta-analytic review revealed that during the last decade (2005-2016), nine different teaching methods have been implemented and evaluated in chemistry classrooms. It has been determined that incorporation of innovative methods significantly promote positive transformation of students as a whole in secondary chemistry. Moreover, findings provide evidence supporting that academic performance, attitude and motivation can be greatly enhanced if students are placed in an environment in which they can actively connect chemistry instruction to previously learned scientific and chemical concepts and materials through constructivist (inquiry-based and problem-based) and collaborative learning method. The main implication of this research is that it generated empirical evidence supporting the effectiveness of innovative instruction in chemistry.
Grade 11 student’s mental model of the Nature of Light
Authors: Chanserm Tevarit , Tupsai Jiraporn , Yuenyong Chokchai
Published: October 2019

This study aims to explore Grade 11 Student’s Mental model of the Nature of Light with the integration of learning about light. The participants were 50 students in Ban Tha Muang School, Buriram, Thailand, Province Thailand. The methodology is in the respect of interpretive paradigm by opened question about Nature of light and interview. The results were student could to explain primary light sources more than secondary light sources because they could students easily find primary light sources in everyday life. Student could to model of understanding mental model about moving light. They could to explain light travels straight out of the light source and travel because its intermediaries because light was electric wave including understanding Mental Model. They could to draw and explain light travels straight from the sun through the vacuum and the atmosphere of the earth and there are some students who paint a wave of light by drawing a wave like a wave in a rope. They could to explain mental model of visibility as see with our eyes, however, there are only some students who associate the impact and reflection to explain the vision. This paper also discusses teaching science about the student’s mental model of Nature of Light in physics as a guideline for those who are involved in the development of learning, focusing on learners who learn to light.
A new approach for comparability of two- and three-bladed 20 MW offshore wind turbines
Authors: Anstock Fabian , Schütt Marcel , Schorbach Vera
Published: October 2019

Wind energy plants are subject to a vast optimization process with a multitude of design parameters. While one specific three-bladed turbine type dominates the on- and offshore market, two-bladed turbines offer promising, but not yet quantified, potentials for cost savings during manufacturing, erection, and maintenance, offshore. Nevertheless, the comparability of two- and three-bladed turbines is challenging, causing an ongoing discussion within research and industry about which alternative to prefer. A new approach could be to reduce the important changes made by maintaining the exact same energy yield. This results in an increase of design changes of the two-bladed rotor, due to slightly (about 2%) longer blades to counterbalance the inevitable losses of aerodynamic efficiency. Nevertheless, it has the great advantage that subsequent comparisons of loads, masses and costs do not have to be associated with a loss of power. This could serve as a solid basis to allow drawing conclusions and considering differences in dynamical loads, masses and costs more directly and hopefully more expediently, when comparing two- and three-bladed wind turbines.
Heuristics-based design and optimization of offshore wind farms collection systems
Authors: Peréz-Rúa Juan-Andrés , Minguijón Daniel Hermosilla , Das Kaushik , Cutululis Nicolaos A.
Published: October 2019

A parallel-based algorithmic framework for automated design of Offshore Wind Farms (OWF) collection systems is proposed in this paper. The framework consists basically on five algorithms executed simultaneously and independently, followed by a combined analysis aiming to generate the best results in terms of different objective functions. The main inputs of the framework are the location coordinates of the Wind Turbines (WT) and the Offshore Substation (OSS), wind power production time series, and the set cables considered for the collection system design. Four heuristics and one metaheuristic algorithm are considered. The heuristics are based on modified versions of well-known graph-theory algorithms: Kruskal (KR), Prim (PR), Esau-Williams (EW), and Vogel’s Approximation Method (VAM); all of them coded in a unified framework with quartic time complexity. The metaheuristic is built upon a Genetic Algorithm (GA) designed using a hierarchical-restricted penalization system. Comparisons between all of these methods are performed from different perspectives, taking into consideration the particular constraints treated for OWF practical applications. In general, primals from heuristics lead to faster and better results when only a single cable is available, and provide collection systems with lower electrical power losses for multiple cables choice, whilst the GA shows better results when the initial investment is prioritized and several cable types are considered.
Hydrodynamic characteristics of the modified V-shaped Semi-floating offshore wind turbine with heave plates
Authors: Shi Wei , Zhang Lixian , You Jikun , Karimirad Madjid , Michailides Constantine
Published: October 2019

In recent years, there is a great need to develop offshore wind energy on a global scale due to the greenhouse effect and energy crisis. Great efforts have been devoted to developing a reliable floating offshore wind energy technology to take advantage of the large amount of wind energy resources that exist in deep water. In this paper, a novel concept of a floating offshore wind turbine (FOWT), namely, the modified V-shaped semi-floating with heave plate, is proposed, and its hydrodynamic characteristics are studied. A numerical model based on ANSYS/AQWA is used to investigate the dynamic motion, response characteristics and mooring performance of the new concept. Moreover, the response amplitude operators (RAOs) of the different response quantities are also elaborated. A comparative study of the dynamic response of the different response quantities of the modified V-shape and original V-shaped semi-floating is carried out for operational environmental conditions. It is found that the modified V-shape semi-floating shows relatively better performance in platform motion and mooring line response.
A tool to simulate decommissioning offshore wind farms
Authors: McAuliffe F Devoy , Desmond C , Chester R , Flannery B , Judge F , Lynch K , Murphy J
Published: October 2019

Decommissioning is an emerging practice for the offshore wind industry. To date, the Yttre Stengrund and Vindeby Offshore Wind Farms are the only installations to have been fully dismantled. While every project requires a decommissioning plan to gain consent; they are high-level estimates of the expected strategy, time required and costs. This is due to the lack of reliable data or experience. However; if underestimated, decommissioning may result in significant and unexpected outgoings at the end of a farm lifecycle. Simulation is an effective way to test a plan is both executable and cost-effective, as well as optimising activities for an individual site. Therefore, a stochastic tool was developed to simulate a wide range of decommissioning methods, considering the impact of uncertain factors such as weather and costs on time and expenditure. It is the first detailed simulation model developed for this crucial project phase. This paper describes the scope of the model; documents the validation activities undertaken; and demonstrates the model’s capabilities. It was found that while further validation against real-case scenarios is necessary, the model can indicatively forecast costs and time for a given strategy as well as optimise scenarios and mitigate risks.
Improving Community Services and Infrastructure in Remote Areas by utilizing Community Need Assessment (CNA) Approach. (Case Study: Kampung in Mahakam Ulu Regency)
Authors: Vidianti R A , Istiqomah R N , Hidayat A R T
Published: October 2019

The remote area is defined as a remote (rural / settlement) location within an area One of the remote area locations is Mahakam Ulu Regency. One of the problems faced in remote areas locations selected by researchers is the availability of commnunity services and infrastructure. This research explores the condition of commnunity services and infrastructure in the Kampung Lutan, Long Hurai and Muara Ratah which are being the priority villages in the Mahakam Ulu Regency. Exploration results are expected to provide input for determining the needs and hopes of village commnunity services and infrastructure by involving community participation. Community Need assessment (CNA) approach was applied in this study involving process of collecting, analyzing and reporting information about community needs and the amount of capacity or strength that exists in the community to fulfill those needs. By understanding the needs and hopes of village community service and infrastructure, it can facilitate the government in establishing the priorities of village development to observe the social aspects of the community. CNA analysis addressing a number of facilities and infrastructures in the three villages tended not to require additional units, but to improve the quality of the commnunity services and infrastructure.
Spatial Pattern of Land Cover Change in The Coastal Area of Gresik Regency, Indonesia Using Land Change Modeler
Authors: Hasyim A W , Sianturi R E P , Hidayat Ar R T
Published: October 2019

Industrial activities could cause multiplier effects; one of them is increasing other supporting activities such as housing, trade and services, and transportation. The rapid growth of the industrial sector in Gresik Regency and the existence of the Java Integrated Industrial Port Estate (JIIPE) can trigger new activities, that could led the change in land use and land cover. This study aims to observe the patterns of land cover change before and after the implementation of the regional spatial plans (RTRW) from 2002 to 2012. The results indicated that, in 2002 to 2007 there was an increase in built-up area by 6016 ha while green open space and empty land decreased by 6416 ha. The implementation of the shifts towards the border areas has no longer occurred in urban areas.
Urban Population Growth and Their Implication to Agricultural Land in the Process of Metropolitanization: The case of Kabupaten Sukoharjo, in Metropolitan Surakarta
Authors: Mardiansjah F H , Sugiri A , Sari G P
Published: October 2019

Extended urban spatial formation has been a major phenomena in many cities’ development, in Indonesia, including big, medium and smaller size of cities. Using the case which occurred in the Kabupaten Sukoharjo, an adjacent kabupaten of the City of Surakarta, this paper discusses the process of population growth, land expansion and their impact on the agricultural land outside the city’s perimeter, in the metropolitanization process of Surakarta as a secondary metropolitan growth in Java based on a medium city size as the core of the metropolitan. The analysis applies time-serial statistical data gathered from the kabupaten’s monographs. It also applies comparative analysis among the kecamatan (districts) in the kabupaten that are classified into two types of kecamatan: the adjacent and the non-adjacent. The analysis indicates a dramatic changing of urban land, which confirmed the impact of uncontrolled urbanization into agricultural land in the peripheries in terms of losing of fertile agricultural land. It also indicates that the process leads to the needs to develop other agricultural land to substitute the loss of fertile agricultural land. Therefore, the analysis indicates the double impacts of metropolitanization process into agricultural land, such as: the loss of fertile agricultural land in its peri-urban and the implication of efforts in producing fertile land in other areas.
Milk Production Curve on Various Test Day Patterns (Case in BBPTU-HPT Baturraden)
Authors: Indrijani H , Anang A , Tasripin D , Salman L B
Published: October 2019

Information about milk production in dairy cows is obtained most accurately by daily recording, but with consideration, such as time and cost. This study aimed to obtain accurate and efficient recording patterns to estimate milk production in dairy cows. This research used recording of milk production in BBPTU-HPT Baturraden. The data used is the record of milk production of Test Day (TD) from the year 2014-2017 as many as 8696 records of TD that derived from 213 head of cows on first lactation. The record of TD milk production is the recording of milk production performed only on certain days during a lactation period. The milk production expectant curve used is the Ali-Schaeffer. The result of this research that Ali-Schaeffer equation with correlation between estimated and actual value (r) 0.991, standard error (se) 0.64, and standard deviation (stdv) 0,01. Recording of milk production Pattern 5, namely the recording of milk production in TD 1, 2, 5, 8, and 11, showed the highest correlation value (r=0.998). It is recommended to record the milk production in the early months of lactation and combined with the recording of TD milk production periodically every three months, from mid to late production.
Correlation Between Fruit Characters with Capsaicin Content in F2 Population of Chili
Authors: Yenny R F , Rostini N , Hersanti  , Anas
Published: October 2019

Chili is one of the most important vegetable spice crop valued for its aroma, flavor, and pungency for Indonesian food. An experiment on chili (Capsicum annuum L) was undertaken to study the genetic correlation and relationship of morphological and fruit characters on capsaicin content using path analysis. The F2 population was developed from the cross between the high capsaicin content of cayenne pepper CF02 inbred line and curly chili K15 inbred line. Capsaicin content was negatively associated with fruit surface, fruit length, fruit diameter, fruit weight, and fruit weight per plant. Based on path analysis, these characters had direct effect and indirect effect on capsaicin content. Direct selection may be executed considering these traits as the primary selection criteria to reduce the indirect effect of other characters during the development of high yielding chili variety.
The Effect of Liquid Organic Fertilizer of Vegetable Waste and Planting Media on Growth and Yield of Strawberry (Fragaria spp.) Earlibrite Cultivar
Authors: Ginandjar S , Frasetya B , Nugraha W , Subandi M
Published: October 2019

Strawberry becomes one of the popular plants in agro-tourism by combining strawberry plantation with culinary tourism. Increasing growth and yield of strawberry plant can be achieved by applying liquid organic fertilizer (LOF) of vegetable waste and planting media. This research was conducted to study interaction between LOF and planting medium (PM) and to inquire about the best dosage of LOF and planting medium for the growth and yield of strawberry. This research was conducted in the sub-district of Cibiru, Bandung City, West Java. The research design was Randomized Block Design with two factors and three replications. The first factor was vegetable waste of LOF with four treatments level respectively: p0: without LOF application, p1:250 ml, p2: 500 ml, and p3: 750 ml. The second factor was planting media with three treatments level respectively : m0: without husk charcoal, m1: (1:1) soil and husk charcoal, m2: (1:2) soil and husk charcoal. The research finding came up by the existence of interaction in leaf width with the highest number by 835.42 cm2 in combination of p2m2 treatment.
Performance of Rice Production and Pest in Riau Province
Authors: Rustam
Published: October 2019

Production of rice plants is affected by pest attacks. This study aimed to (i) analyze the trend of rice production and pest in Riau Province over the past 10 years, (ii) to predict the trend of pests and rice production of Riau Province for the next 5 years, and (iii) to formulate policy alternatives in order to increase rice production and pest attack control in Riau Province. Secondary data covering production data and paddy pests were obtained from related institutions. For validation and completion of some secondary data, the primary data was collected from direct observation and various competent sources. The data were analyzed in tabulative, regression and simple descriptive to answer the research objectives. The results showed that there has been a decline in rice production in Riau Province for the last 5 years was quite high (23.0%). The decline in production is mainly due to a decrease in harvested area. The decline in production is also caused by pest attacks. The type and extent of rice pest attack show a fluctuating trend. There are 8 types of pests causing rice crop failure (puso), namely bird, rice bug, golden apple snail, stem borer, brown spot disease, blast, and bacteria leaf blight. The total area of rice pests attack by category of puso 161.4 ha. In the next 5 years, Riau rice production is predicted to increase every year while pest attack will decrease every year. Rice production can be increased through increasing harvested area, reducing land conversion, water availability. While pest attack can be suppressed through the use of resistant varieties, early detection, simultaneous control, and intensify counseling.
Strengthening the Beef Cattle Farmer-Based Organization in Partnership System of Maiwa Breeding Center
Authors: Kasim S N , Abdullah A , Herry S , Tanrigiling  , Aminawar
Published: October 2019

Abstract.This research aimed to study improvement of beef cattle farmer-based organization in partnership system of Hasanuddin University Maiwa Breeding Centre. The research population was 75 farmers with a sample of 43 respondents whose determination was carried out in descriptive statistics using the Slovin formula. The sampling technique was carried out by simple random sampling. Observation data retrieval techniques are direct observation on MBC Unhas locations and in-depth interviews using structured questionnaires. The analysis was carried out quantitatively descriptively using descriptive statistics (frequency distribution table). As a result, the improvement strategy on resource (R), organization (O), and norm (N) aspects was perceived as less effective in achieving strengthen beef cattle farmer-based organization in partnership system of Maiwa Breeding Center.
Paddy Ratoon (Oryza Sativa) Nutrients Quality as Feed Forages at Various Cutting Height and Cutting Ages
Authors: Islami R Z , Susilawati I , Mustapa H K , Budiawati Y , Nurjanah S , Rochana A
Published: October 2019

This study was aimed to determine the nutrient quality of paddy ratoon (Oryza sativa) at various cutting ages. The design used was completely randomize design with factorial design. The first factor is the cutting height with a cutting height of 10 cm, 20 cm. The second factor is cutting ages which is 14 days cutting ages, 21 days cutting ages and 28 days cutting ages and 35 days cutting ages. The result showed that cutting age of paddy ratoon as forages that produce optimal nutrient quality is at the age 14 days after cutting, with 10.34% crude protein and 28.45% crude fiber and 1.15% crude fat. Height cutting of paddy ratoon is not significantly affected nutrient quality
The reason and prevention measures for the rod and tubing wear of the pumping unit in the Bei 301 operation area
Authors: Xie C Y , Ma Y Z , Jing Q Y , Zhang G , Sun Y S , Liu Q H
Published: October 2019

In order to study the effective prevention measures to improve the regulation effect of the anti-deflecting measure in Bei 301 operation area and prolong the pump cycle of the oil well. The calculation of the historical data of the eccentric wear well and the analysis of eccentric wear prevention effect show that eccentric wear condition in Bei 301 operation area of hailaer oilfield is relatively serious and the operating wells’ ratio of rod breakage and tube leakage increases year by year due to eccentric wear [1,2]. In 2014, the proportion of rod breakage and tube leakage in the operating wells of the operation area was 19.4% and 45.2% respectively, and the average pump inspection cycle was around 400 days. The reasons for the serious wear of the rod pipe in Bei 301 operation area are the improper production parameters, the submergence depth, high water content and well fluid properties according to the detailed data analysis of the pump operation. Active eccentric wear prevention measures have some effect, and next research direction for preventing eccentric wear is put forward in this paper: the paraffin-removing technology, bi-directional protected box coupling and low friction pump combined with the problems faced by the operating area.
A centralized coordinated control strategy for distributed generation when microgrid on grid
Authors: Tang W
Published: October 2019

This paper presents a centralized and coordinated control strategy for microgrid, whose control strategy includes the coordinated control of renewable energy sources (RESs) and energy storage systems (ESSs). To solve the schedulability of distributed generation in a microgrid, when it operates in grid-connected, a multiple operation mode is adopted, through switching the operation mode, the charge/discharge and state of charge (SOC) of ESSs can be maintained, and the loads will be shared by RESs first when microgrid occurs power deficiency, it reduces loss of ESSs. In this paper, a secondary control strategy for the microgrid model by simulated in MATLAB/Simulink, it through switched three modes, improves schedulability of microgrid and realizes SOC balance smoothly. The results show centralized and coordinated control strategy is accurate and useful.
Study on the risks and countermeasures after openness of the electricity market
Authors: Qin G Y , Liu D N , Liang J H , Pan Y , Wang L X
Published: October 2019

With the deepening of the reform of the electric power system, more and more uncertainties in the competitive electricity market mean more risks. This paper focuses on the risks and countermeasures after openness of the electricity market. Firstly, deeply analysis on the two traditional types transaction of power market which is large concentrated transaction and micro-balance of park electricity market; Secondly, analysis on the risk of transaction participants from three aspects. Finally, based on technology of information and platform, putting forward countermeasures and suggestions based on early warning of big data transaction platform, information value-added service and risk control strategies after openness of the electricity market. Future research orientation upon this analysis is establishment of power market risk evaluation index system and study of risk quantification methods.
An optimized dispatch model of combined heat and power system unit commitment considering heating network characteristics
Authors: Luo Z Q , Yang J F , Xie H B , Zhou S Y , Hu L X
Published: October 2019

The large-scale commissioning of combined heat and power unit leads to difficulty of peak regulation and wind consumption, and combined heat and power optimized dispatch is one of effective ways to solve this problem. Under existing optimized dispatch models of combined heat and power system, pre-decided unit commitment scheme may cause a large amount of wind curtailment because of excessive operating units and total minimum technical output of units. In view of these problems, through combination of unit commitment and optimized dispatch, an optimized dispatch model of combined heat and power system unit commitment considering heating network characteristics is established. Similarities and differences of heat and power energy transmission are analyzed, heat load partition balance equation as well as positive and negative spinning reserve constrains of thermal system partition are established, and influence of heating network characteristics, including time delay and heat loss, on unit commitment scheme and wind curtailment is studied. A numerical example shows that heating network characteristics influence unit commitment scheme (one unit shuts down an hour ahead and starts up an hour later). Besides, it shows that while meeting power and heat load demand, the model of this paper can timely start up or shut down units according to load change and spinning reserve demand, reduce total minimum technical output of operating units to 632.4 MW, and further improve wind power accommodation quantity to 3410.24 MW·h.
Analysis on operation reliability of hydropower units in China
Authors: Han Q , Liu Z L , Liu S L , Xu N
Published: October 2019

With the rapid development of hydropower in China, in just a few years installed capacity has leapt to the world’s first, in addition to thermal power outside the development of the second largest electricity supply. However, the equivalent availability level of hydropower units in China is lower than that of conventional fossil energy thermal power units, and the cost of unit engineering is higher, especially the unplanned shutdown coefficient of pumped storage units in China is much higher than the world level. Therefore, it is urgent to carry out the research on the operation reliability of generator sets. Based on the analysis and summary of the basic situation, operation situation, planned outage and unplanned shutdown of hydropower units in China, this paper puts forward the main problems of reliability of hydropower units and hydroelectric power plants, which are used for reference and exchange by professional and technical personnel engaged in hydropower industry.
Research and practice on coordination assessment system of Yunnan transmission network and power supply construction
Authors: Zhang X Z , Qian W , Wang Z M , Liu J , Zhao S
Published: October 2019

Power supply and power grid are both independent and closely related, and they are two parts of the power supply community. Power supply and power grid have their own characteristics and laws, and their interactions are different in different stages of development of power industry. Under the market environment of the new power system reform, some new changes have taken place in the relationship between the two. Firstly, this paper analyses the changes of the related factors of power construction after the reform of power system, and then constructs the coordination evaluation system of Yunnan power transmission network and power construction from the aspects of power development mode, energy policy and new energy access. Finally, taking Yunnan Province as an example, it evaluates the coordination of power transmission network and power construction in 2017, which proves the feasibility and science of the evaluation system.