bluuebunny/crossref_metadata_2025_split huggingface dataset:
STEM learning of “value-added on banana chips” to enhance students’ motivation and entrepreneurship attitude in a rural school
Authors: Amri H , Adlim M , Nurdin S 
Published: May 2021

Abstract
The unemployment of high-school graduates continuously increases because they do not have the required skill to work. Life skill training is not programmed for such general schools; however, entrepreneurship practice is introduced in the regular curriculum. Life skill learning, which integrates science and technology, is known as STEM learning. This study aims to investigate the implementation of STEM learning with the topic of’the increase of value-added on banana chips" to enhance student motivation and entrepreneurship attitude in rural senior high schools. The STEM module was previously developed with the research and development method and ADDIE model. The module was validated before being used. Several student worksheets were used to collect data on motivation and entrepreneurial attitude before and after STEM learning was conducted. STEM-based student worksheet had been validated, and it was valid to be used. The scale of student creativity during the implementation of STEM was categorized high with the component of elaboration (83.3 %), originality (87.5%), and fluency (75%). The accumulation of mean score indicators of student motivation and entrepreneurship attitude increase from 46.8% to 75.6%, which means students are very interested in entrepreneurship. Entrepreneurship character can be induced by STEM learning.
Interpreting the investigative science learning environment (ISLE) for its implementation in Indonesian STEM education
Authors: Oktavia R , Irwandi  , Melvina  , Rajibussalim  
Published: May 2021

AbstractThis paper reports a qualitative inquiry to investigate the application of the Investigative Science Learning Environment (ISLE) approach as a framework for teaching and learning physics. The aims of this study are to investigate how ISLE processes are applied, what the perspectives of instructors and students on the ISLE approach are, how the ISLE approach could be possibly applied in the physics courses and other STEM courses in Indonesia. Participants in this inquiry consist of the inventor of ISLE, three ISLE instructors, and students in an ISLE lab session. We used qualitative case study method and narrative data analysis in the process of evaluating data from observations, interviews, and ISLE-based learning materials and publications. It was found that the ISLE approach was applied smoothly in the class and lab sessions. The ISLE instructors are those who believe in the philosophical and epistemological reasoning behind the framework and the importance to nurture students’ scientific abilities. Some students liked the ISLE approach, some didn’t. Those who liked ISLE found that they enjoyed the process of thinking and discussing in learning. It is very likely to apply the ISLE approach in Indonesia for physics courses, but it will be challenging for other subjects.
Homegardening for food and nutritional security and for biodiversity conservation during the pandemic times
Authors: Kumar B. Mohan 
Published: May 2021

Abstract
The COVID-19 pandemic and the associated lockdown – often regarded as a “Global Human Confinement Experiment” – has created an unprecedented situation around the globe. While the reduced human presence and mobility, causing declines in visitation rates of protected areas, may generally favour biodiversity conservation in natural ecosystems, the pandemic has caused major disruptions of the food supply chain. Furthermore, the “reverse migration” of labour has led to scarcity of workforce in many localities hitting agricultural operations. The cumulative effect is food insecurity for millions of people in both the developed and developing countries. It is therefore crucial to encourage local food production systems at the household and community levels. Tropical homegardens, which are resilient and sustainable production systems, are important in this respect. Homegardening is a unique farming system, which combines divergent production and service functions around the homesteads and contribute to the supply of fresh food at the household level. Being a decentralized production system, such practices may reduce food wastage along the supply chain. A prominent structural attribute of homegardens is the great diversity of species ranging from creeping herbs to tall trees and livestock, implying their potential for biodiversity conservation. Although land-use systems are challenged as never before in the wake of the pandemic, homegardening may provide a way forward to overcome the looming food insecurity at the household level in the rural areas of many countries.
Key drivers of organic rice productivity in Sleman and Magelang Regencies
Authors: Devi Laksmi Yustika , Irham  , Subejo  , Anatasari Esti , Nurhayati Azizatun , Wahyu Widada Arif 
Published: May 2021

Abstract
Organic farming system in Indonesia had been growing continuously in the recent years. Organic label could only be put on products which were complied with organic standards and regulations as well as certification requirements. As the world became more global, in addition to organic national certification, Indonesian organic farmers needed to comply with international organic certification so that they could enter the open market. This study attempted to: (1) provide a descriptive analysis of rice organic farmers’ characteristics in two locations of organic farming, (2) understand farmers’ knowledge and motivation on organic farming, and (3) analyse the gaps between farmers’ practice in organic farming and certification standard requirements. Results of the study showed that, basically, all farmers understood the concept of organic farmers. However, the farmers had not fully implemented the procedures as required in the Indonesian National Standard (SNI), let alone international organic certifications (IFOAM and USDA). There were several aspects that need to be improved in order to close the gaps between farmers’ practice in organic farming and certification standard requirements.
Adaption of local rice cultivars Banten to drought environment
Authors: Rusmana  , Ritawati S , Rohmawati I , Ningsih E P 
Published: May 2021

Abstract
Limited water availability or drought is an abiotic factor that inhibited rice production. One of the efforts to overcome this problem is by using plant varieties that can adapt to conditions of limited water availability. This study aims to determine the physiological and agronomic responses of some local rice cultivation in South Banten to drought conditions. The research was conducted from April to October 2017 in the greenhouse of the Faculty of Agriculture, Sultan Ageng Tirtayasa University, Banten. The experiment was based on factorial experiments in a completely randomized block design (RBD) with 3 replications. The first factor is the frequency of irrigation which consists of 2 levels, namely irrigation every 7 days and every 9 days. The second factor is the local rice cultivar in South Banten which consists of 8 levels, each of which consists of 7 local cultivars and one comparison variety, namely Rencong, Ketan Dewo, Kiara, Inpari 10 (as comparison varieties), Super, Kapundung, Cimoherang, and Ketan Elfi. The results of research show that cultivar of Ketan Dewo adaptive in drought environments.
Tofu wastewater industry with urea fertilizer as a cultivation medium for the microalga Spirulina plantensis
Authors: Soedibya P HT , Pramono T B , Sukardi P , Kusuma B , Marnani S , Fitriadi R , Aditama T 
Published: May 2021

Abstract
One of the limiting problem in fish larvae rearing is the availability of live feed such as zooplankton and phytoplankton. Spirulina platensis is a phytoplankton with important uses in fish larvae culture either as a live feed or an ingredient supplementation in the feed. However, its cultivation has high economic costs associated with the growth medium. One of the alternative medium that potentially reduce costs and environmentally friendly is tofu wastewater. The purpose of this research is to evaluate the combination of tofu wastewater with urea for the cultivation of S. platensis. We investigated the growth of S. platensis in tofu wastewater containing various concentrations of urea: 0 g (control), 10 g, 20 g, 30 g, or 40 g urea added to 3 L diluted (2:1) tofu wastewater. The S. platensis productivity parameters were measured are population density, specific growth rate, and doubling time. The population density growth was significantly different, while the specific growth rate and doubling time were not significantly different for the various urea concentrations. The optimum growth was observed with 10 g urea per 3 L medium. This combination of tofu wastewater with urea could be a cost-effective medium for the cultivation of S. platensis.
Factors affecting electricity demand in Cambodia
Authors: Dy Virak , Paoprasert Naraphorn 
Published: May 2021

Abstract
Recently, there are many factors affecting electricity demand in different ways. The relation between electricity demand and economic, demographic, increasing new consumer connection, technological, climate, and government policies on electricity price, etc. This study aimed to identify the main factors that affect electricity demand and observed which factors had more relation affecting on electricity demand in Cambodia. The first method of defining relation to predicting annual power demand in the future on economic factors based on annual data from 2004 to 2018. The method was paring GDP with power demand delivered using regression analysis, then with GDP and Total consumer connection by multi-regression analysis. Secondly, for environmental factors affecting on predicting daily maximum power demand (Pmax) by temperature and humidity from 1st Jan 2020 to 20th July 2020, using regression and multi-regression respectively. As a result of linear regression, we observed annual new consumer connection and GDP of Cambodia were the best factors affecting electricity demand. However, for environmental factors, temperature and humidity are not really affect the curve of (Pmax) from our data. Daily temperature in Cambodia could be explained only 4.2% of daily maximum electricity demand while humidity was not significant.
Design improvement for safety risks using hazard and operability method
Authors: Kristiana Retna , Kushardiono  
Published: May 2021

Abstract
Application of occupational health and safety procedures consists of programs that aim to protect and welfare the workers. However, in reality, many workers still carry out such violations related to work procedures. This study aims to determine the risk of breaches that affect the procedure works and know the dominant risk affecting workers on the World Trade Centre (WTC)-3, Jakarta. This research approach uses the HAZOP method and SPSS to analyze the validity and reliability of data. The methods used to identify risks are brainstorming or interviews with the experts and operability study (HAZOP). From these results obtained on 14 sources from 23 sources of work activities with a high-risk level, which is the dominant risk, it should get priority to be fixed or controlled to minimize accidents at the height of the World Trade Center (WTC)-3, Jakarta.
IOT Based Climate Monitoring System
Authors: Muslim Muhammad Aziz , Setyawan Raden Arief , Basuki Achmad , Razak Angger Abdul , Hario Fakhriy P , Fernando Edward 
Published: May 2021

Abstract
In this paper, an IOT based climate monitoring system for rural area is proposed. The selected location for IOT sensor placement is Sumberbrantas village which is vulnerable for flood, landslide and strong wind disasters. For these reasons wind behaviors, rainfall and temperature sensors are installed in IOT stations. Based on information from local residents, strong winds always blow every year. The wind flowed for several days causing residents to be unable to move outside their homes. This wind is flowing so fast that it can damage the roof of the house. However, currently there is still no device that accurately measures changes in air pressure or wind speed in the area. To collect data, as well as to anticipate problems caused by these strong winds, an IOT-based monitoring system was built to observe the weather that occurred in the area. Experiments show that the proposed monitoring system is able to send monitoring data every 5 minutes. The monitoring data consist of temperature, humidity, wind direction, wind speed, barometric pressure and rainfall.
Geochemical of Volcanic Rock in Southern Part of Slamet Volcano, Indonesia
Authors: Candra Adi , Zaenurrohman Januar Aziz , Siswandi  , Wahyu Nugroho Aprian 
Published: May 2021

Abstract
Slamet volcano is the biggest volcano in Central Java, Indonesia which has stratovolcano type. Starting in 1772 until recent, Slamet volcano was erupted with short cycling so that geochemicals on rock are important to know how the history and erupted type. Method of research was conducted by geological survey (surface) and geochemical analysis of sample rocks. Geological condition is consist of lava flow, pyroclastic fall, and laharic deposits that was proven by petrography approached, meanwhile geochemical composition shows calc-alkaline and high K calc-alkaline series, genesis of magma was from continental plate with island arc tholeiitic setting. Depth of magma 155-174 km belom the earth’s surface.
Inversion calculation and prediction of extreme conditions by in-situ test of real machine in a hydropower station
Authors: Li Gaohui , Pan Yibin , Qiu Weixin , Yang Fei , Zhang Mengjie , Zhou Tianchi 
Published: May 2021

Abstract
The in-situ test of the real engine in hydropower station is a necessary test before the unit is put into operation. During the test, the problems in the test process can be found through the auxiliary inversion calculation, and the calculation and analysis of extreme conditions can provide important support for the unit’s permanent operation. First of all, this paper analyzes the problem that the maximum pressure of the spiral shell and the increase rate of the unit speed in the load rejection test of the hydropower station exceed the control standard. Through inversion calculation, it is found that the closing law of the guide vane of the unit is different from the set closing law, and the robustness of the closing law is poor; then, combined with the test situation, the closing law of the guide vane of the unit was optimized. While the adjusted load rejection test was simulated under the same boundary conditions, and the measured data and numerical calculation results were compared and analyzed to obtain the modified values of the characteristic parameters. Finally, the extreme conditions in the transition process of large fluctuations are predicted and calculated by numerical simulation. This research idea provides reference and guidance experience for similar projects.
Potential energy analysis based on piezoelectric cantilever beam structure
Authors: Sheng Ming , Wang Shengpeng , Tang Yuhang 
Published: May 2021

Abstract
The piezoelectric vibration energy collection technology utilizes the positive piezoelectric effect of the piezoelectric material, and collects the energy by attaching the material to a clamping structure and deforming under the external excitation, thus accumulating the charge and generating the potential difference. In this paper, the cantilever beam is used as a clamping structure because of its large deflection and simple structure. In this paper, the raindrop impulsion is applied to the piezoelectric material, the piezoelectric vibration energy capture device is used to improve the energy collection efficiency, and the electromechanical coupling model is established to simplify the potential energy analysis by using the conservation of energy and Newton’s second law. In this paper, Runge-kutta method is used to simulate the differential equation, which reduces the computational cost of the system and has a certain precision for analysis and solution. Based on Al-‘Ula’s Bernoulli beam theory, the model was simulated by using the differential equation method and the ordinary differential equation group.
Fuzzy-SPA method based quantitative risk assessment for tailings pond
Authors: Shi Jianyun , Pan Ke 
Published: May 2021

Abstract
Regarding characteristics of tailings pond and the requirements of regulations in China, a quantitative evaluation framework of tailings pond indicators was founded. The index system for tailings pond was divided into four parts, which were management capability, engineering designing, monitoring indexes and environmental impact. Furthermore, a set-pair analysis (SPA) based on fuzzy assessment method (Fuzzy-SPA) was presented for the quantitative risk assessment in this paper. It overcame some defects in traditional risk assessment methods and expanded the scope of current methods. Both qualitative and quantitative indexes can be used in the method, then a comprehensive risk score can be achieved. The proposed model was applied to assess a certain tailings pond in Benxi. The result indicated that this method used was feasible and rational. The work presented in this paper can be as reference through adequate selection of model parameters to the safety assessment work for the tailings ponds.
Distribution characteristics of elemental grade and mineralization grade of Jiama copper deposit
Authors: Liu Hui , Wan Li , Zeng Xiangjian 
Published: May 2021

Abstract
The change of metallogenic element grade in borehole has strong randomness and nonlinearity. Quantitative analysis of metallogenic element grade distribution is one of the important ways to reveal the degree of mineralization enrichment. Taking Jiama porphyry copper deposit as an example, the distribution structure of Cu grade series in exploration lines 32 and 36 is analyzed by lacunarity method, and this paper discusses the relationship between lacunarity index and mineralization intensity. It is found that both the lacunarity index and parameters of Cu element in different boreholes exist distinction, the higher the mineralization intensity, the smaller the lacunarity index and the smoother the curve, pointing that the high-grade Cu element is more enriched and uniform. The size of lacunarity index and the variation trend of lacunarity curve have a certain indicative effect on mineralization grade.
Simulation and Application Research on the River System Connectivity, Considering the Flood Control and Agricultural Water Objectives
Authors: Liu Jin , Guan Xu , Liu Xia 
Published: May 2021

Abstract
With the rapid development in social economy, the waste water discharge amount in many cities of China is on the rise continuously. This has resulted in excess pollutants in rivers and lakes, deteriorating hydro-ecology environmental issues and so on. The problems have a serious impact on the social and economic development. Focusing on the demonstration site of Zhong Shun Da Wei, this paper started to approach how the connectivity of river-lake water system influenced the two objectives of the great water-retaining structure, which were flood control and agricultural water storage. It deeply probed into the basic theory and key scheduling technology of water system connection throughout the river networks in Zhong Shun Da Wei. The results are indicating as follows. 1). Under present condition, the demands on river system connection at the demonstration site of Zhong Shun Da Wei are mainly represented by two aspects, namely flood control and agricultural water divergence; 2). For Zhong Shun Da Wei, if it is primarily used to control floods, Scheme One is the optimal solution; 3). If it is mainly applied to agricultural water, Scheme Three is the optimal solution. The research findings can provide important technical support and theoretical basis for comprehensive dredging, renovation, hydro-ecological protection and other projects in Zhong Shun Da Wei.
Research on Hydraulic Characteristics of Navigable Tunnels of High-Dam Navigable Structures and Ship Navigation Test
Authors: Yu Guangnian , Zhao Jiaqiang 
Published: May 2021

Abstract
To deal with the problem of ship navigation under the ultra-small section coefficient of navigable tunnels of high dam navigation structures, a large-scale hydraulic physical model combined with a self-propelled ship model was used to study the characteristics of the unsteady flow of the tunnel discharge and the navigation parameters of ships at different speeds. This paper analysed the influence of the ship lock discharge on the tunnel water level fluctuation and flow velocity, proposed parameters such as the size of the navigable tunnel for 1,000-ton ships, the recommended speed and the amount of ship sinking, which provide references for the design of navigable tunnels for high-grade waterways.
Evolution of hydrological regime in middle and lower reaches of Han River driven by water conservancy project and countermeasures
Authors: Liu Yangyang , Liu Bojuan , Shen Dandan 
Published: May 2021

Abstract
The Han River is not only an important water supply source in China, but also a treasure trove of water resources for the economic and social development of Hubei Province. In this paper, the evolution characteristics of hydrological regime in the middle and lower reaches of the Han River (MLHR) under the influence of numerous water conservancy projects were studied, and the related problems of resource and environment were analysed, and then corresponding countermeasures were proposed. The results showed that the mean annual flow in Huangjiagang and Huangzhuang section decreased by 20.3% and 5.5%, respectively, during the four years before and after the operation of the Middle Route of South-to-North Water Diversion Project (MRP). Meanwhile, there were a decrease in the duration of the medium and high runoff and an increase in the duration of low runoff, leading to an enhancement of the attenuation effect of the annual runoff process. Moreover, a pattern formed that natural rivers and reservoirs appeared alternately after the construction of cascade reservoirs. Furthermore, with the variation of hydrological regimes in the MLHR, there were some problems of the contradiction between water supply and water demand, the evolution of river regime, the reduction of suitable aquatic habitats and others. In these regards, for providing technical support for the construction of the Han River Ecological Economic Belt, some countermeasures and suggestions were proposed, such as rational allocation of water resources, the promotion of the construction of the follow-up water supplement project and the implementation of ecological regulation in the MLHR.
Analysis of Loess Wet Deformation and Slope Stability under Rainfall Conditions
Authors: Zhou Heng , Di Shengjie , Zhang Ying 
Published: May 2021

Abstract
Loess is a typical unsaturated soil, and the unsaturated strength is the basis for the analysis and evaluation of engineering stability in the loess area. Based on the analysis of the wet load deformation strength, rainwater infiltration and slope stability of unsaturated loess, this paper obtains the yield stress under different suction caused by soil humidification at different depths, the water retention characteristic curve and the different loess with different dry-wet cycle history. The research conclusions can provide reference for the construction of loess collapsibility model and the numerical calculation of the collapsibility deformation of the loess site under the infiltration of rainwater.