bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamic parameters of a RC building extracted from earthquake data using the Random Decrement Technique
Authors: Tiganescu Alexandru , Craifaleanu Iolanda Gabriela , Balan Stefan Florin 
Published: May 2021

Abstract
The paper presents results from a study on monitoring the long-term variation of the dynamic characteristics of an 11-story reinforced concrete building located near Bucharest. Since the deployment, in December 2013, of a permanent monitoring system, 89 seismic events with a moment-magnitude (MW) larger than 3.8 were reported. Out of these, 80 were recorded properly by the seismic sensors and the data was used to extract the fundamental frequency and the damping ratio of the building for each event. The main method used to compute the dynamic parameters was the Random Decrement Technique. A dependency of the resulting fundamental frequencies on the maximum accelerations at the base and on top of the building was observed. Due to the structural peculiarities, the fundamental frequency of the building on the transverse direction was lower than the one on the longitudinal direction, this being reflected also by the experimental results. The maximum drop in the fundamental frequency was reported for the MW=5.5 October 28th, 2018 seismic event. By performing this type of analyses, the dynamic parameters of buildings can be tracked over long periods of time and their variation under seismic excitation can be assessed, allowing rapid detection of structural health alterations.
The use of high-performance asphalt mixtures in heavy traffic road structures
Authors: Cristache A M , Răcănel C , Burlacu A 
Published: May 2021

Abstract
Asphalt mixtures are being used in road construction more and more, to the deficit of concrete surfaces. Due to the additives as well as the new technologies being used to obtain asphalt mixtures, the results are vastly improved which can lead to a better behavior in day to day situations, even under heavy traffic. This study means to show the way in which changing the binder influences the properties of the mixture. So, the chosen binder course, type BAD 22.4, will use different types of binder (bitumen), more specifically: a 50/70pen bitumen; a 50/70pen bitumen modified with flexible semi-rigid polymers and a PmB 45/80-65 bitumen, modified with polymers by crosslinking. The asphalt mixtures will be characterized by their volumetric properties, Marshall Characteristics and their behavior to dynamic tests. The results presented in the form of charts and tables were obtained in the Road Laboratory of the Technical University of Civil Engineering of Bucharest. The conclusion that can be drawn is that depending on the type of binder used, the results obtained differ with a noted improvement of the resistance to permanent deformation and creep, in the mix which uses the binder modified with polymers by crosslinking technology.
Influence of the photosynthetic photon flux density value on microclimate in healing and acclimatization tunnels for vegetable seedlings
Authors: Dumitrescu I L , Ghiaus A-G 
Published: May 2021

Abstract
For seedlings production, healing and acclimatization are the most important processes in obtaining healthy and vigorous plants. Influence of photosynthetic photon flux density (PPFD) on a healing tunnel environmental parameters was investigated. The experiments were carried out at HORTING institute’s micro-production greenhouse using 9 alveolar trays with 104 eggplant seedlings each, placed in two sections of the specialized tunnels for healing and acclimatization of seedlings. In each section and in the research greenhouse was measured the levels of photosynthetic photon flux density, of temperature, of the relative humidity and the level of CO2 concentration. From the meteorological station of the HORTING institute, data on the variation of outdoor temperature, relative humidity and light intensity were downloaded. The variation of the micro-climate factors in the two sections according to their external environmental conditions were compared. One of the conclusions is that seedlings that have benefited from an additional artificial source of light have a more intense photosynthetic activity. The difference on CO2 concentration in the two sections over the same time period lead to this conclusion. This gives the certainty of obtaining healthy and vigorous plants in the sections with supplementary lighting.
Pancasila and Saving Lifestyle: a Case Study in Bina Nusantara University Jakarta Students
Authors: Witono P H , Prasojo A , Megawati C 
Published: May 2021

Abstract
The purposes of this research are to learn the construction of Pancasila as an applied paradigm in suggesting policies of fair economy for developing saving habits of students in Bina Nusantara University Jakarta. The economy of Indonesia has expected high growth in accordance with Pancasila, which is the value of Indonesian’s ideology such as religious values, culture, and norms that have been well-respected. This study used a qualitative descriptive method through interviews with ten millennial generation students. Data analysis techniques are using ‘contents analysis’ methods to explore and build meanings from the taken research data. Pancasila is the basic compass of the breath of economic movement. The values of Pancasila encourage to every citizen of the right to freedom of savings. The lifestyle of saving is one of the initial factors for economic growth in a society because it has social benefits. The family is the first place where the younger generation is formed. The results revealed that the role of parents, especially fathers, really took a role in financial character education in the family. Schools must also provide financial education to parents and students.
Mother’s Ecoliteracy in Maintenance Family Food Security in Rural Area
Authors: Nugraheni P L , Zulfa V , Hasanah U 
Published: May 2021

Abstract
Food security is a condition of fulfilling the needs of foods every household, which is reflected in the availability of adequate food, both quantity and quality, equitable, and affordable. As the main manager in the fulfillment of food and nutrition needs in the family, mothers must maintain family food security under any conditions. Through good environmental knowledge, it can become a mother’s capital in utilizing a home garden to be planted with local food crops. Utilization of the yard can not only fulfill family food and nutrition needs but also increase family income. This study explored the influence of the mother’s ecoliteracy in maintaining family food security. The sample consisted of 100 mothers in Segaran Village, Karawang District. The study method used was quantitative descriptive with survey techniques.The result of the analysis revealed the mother’s ecoliteracy has a significant correlation with a mother’s role in maintaining family food security with a determination coefficient of 20,2%. The results showed that the mother’s ecoliteracy in Segaran Village still had to be improved by counseling and training. It is hoped that the increase in the mother’s ecoliteracy can impact increasing family food security through the movement of utilizing a home garden.
The management of “ngettek” service (helping control the traffic) “sahabat baluran” in Situbondo district, East Java, Indonesia
Authors: Masroni A I , Sumardi  , Soepeno B 
Published: May 2021

Abstract
“Ngettek” in Baluran forest is the one who helps to control the traffic when there is a traffic jam in Baluran forest by getting voluntary payment from the riders who pass the traffic. Today, people who work as “ngettek” have an organization named Sahabat Baluran, to manage “ngettek” services and to be a place for working as a form of legal corporation so that they work comfortably and safely to help traffic in Baluran forest. The aim of this study was to find out, to analyze, to apply the management of “ngettek” service (helping control the traffic) “Sahabat Baluran” in Situbondo district. The research method used was a descriptive qualitative method with a sampling technique. From this research, it was found that the existence of “ngettek” worker in Baluran forest make the riders in Baluran traffic feel comfortable and the management of “Ngettek” service make the “Ngettek” workers can be directed to know about planning, organizing, actuating and controlling during the work.
The Effectiveness of Critical Thinking Ability on the Basis of Quizizz Application Viewed from Problem Based Learning Model in History Learning of Senior High School
Authors: Nashar  , Nurhasanah A , Fauzan R 
Published: May 2021

Abstract

Problem based learning is a learning method that characterized by real problem that must be solved which triggers the learners to think critically to find a new knowledge. In accordance with this point, this study is aimed to identify the difference of critical thinking among the students through the application of quizizz in the experimental class with problem based learning model and students with interactive learning model. This study is also aimed to investigate the effect of problem based learning on the improvement of student critical thinking ability. The utilization of quizizz application to scrutinize the critical thinking ability of the students is toadapt the 4.0 education development where the students must be common with the use of technology for learning process. The method was quasi experiment with nonequivalent controlled group design. Based on the T Test to investigate the critical thinking of the students, it is known that tount score = 0.85 with α = 0.05. Thus, it can be concluded that the use of the problem based learning model is more effective in increasing students’ critical thinking skills when compared to the interactive learning model. The N-gain test revealed that tcount score = 4.90 with α = 0.05, it can be concluded that there was an improvement on the student critical thinking in the application of Quizizz.
Teacher Quality Gap In Elementary And Primary Schools
Authors: Sholihah M , Permatasari Y D , Zionis R M , Budianto N , Fadlillah  
Published: May 2021

Abstract
Indonesia has two kinds of schools for children age 7 - 13, which makes it different and unique from some other countries. Elementary school is a school that runs directly from the ministry of education, while primary school is run under by both the ministry of education and the ministry of religion. These two differences influence the quality of its education through the quality of its teachers which bring up “teacher gap”. There is a pretty huge gap between those two on teacher’s side, especially on teacher’s status which affects on their professionalism and teaching skills. The focus of this paper is to answer two main questions; 1) what is the quality gap on teachers in elementary and primary schools?; 2) how does it sustain inequality education to elementary and primary schools? Based on the collected data that was taken by observation, interview and documentation of this case showed that there are teachers here have a lot of differences related on their status which add up inequality on the school environment and education quality. The result of this study is expected to show the gap on teacher quality in elementary and primary schools by using a descriptive method.
Development of Maroon Mangrove Education Park (MMEP) in Supporting Mangrove Conservation in Coastal of Semarang City
Authors: Sidiq W A B N , Martuti N K T , Irsadi A , Mutiatari D P 
Published: May 2021

Abstract
Maroon Mangrove Education Park (MMEP) is a mangrove education site located in the Maroon Coastal of Semarang City. The development of MMEP as a mangrove education tour was carried out by the Mekar Tani Lindung mangrove farmer group (METAL) in 2016 on an area of 64.93 hectares with support from PT Phapros Tbk and. As a MMEP mangrove tourist destination has a variety of attractions such as diversity of mangrove species (12 species), tracking mangroves and some interesting photo spots with aircraft background from the adjoining Ahmad Yani Airport, so many visitors come especially on weekends that contribute to improving the manager’s economy and local society. In addition, the development of MMEP also has an impact on the sustainability of mangroves from planting activities both by the manager and the community in collaboration with various parties. Based on the results of monitoring of digital images of the globe in the region, it was seen that there was an increase in the area of mangroves in the period of 2014 - 2018 amounting to 3.5 hectares and experiencing an increase in the area back in 2020 of 0.05 hectares. The increase in mangrove area will certainly have an impact on improving the quality of the city of Semarang which has been damaged.
Identification of rocks based on rock’s structure in Blawan-Ijen, East Java, Indonesia
Authors: Astutik S , Nisa S L 
Published: May 2021

AbstractIjen Complex is the area that became part of Mount Ijen. In morphology, Ijen complex has Kendeng caldera the diameter of 14-16 km in the North whereas in the southern part of forming a row of mountains. The northern part of Mount Ijen as Blawan–Ijen is the area has the potential of geothermal. Blawan-Ijen becomes the gathering place for the volcanic materials since this region is a region which has low topography. Volcanic materials collected form a rock after experiencing cooling and in a long time. This research was conducted to identify the rocks in the area of Blawan–Ijen. The process starts with a sampling of rocks. Then the rocks are identified based on the structure of the manifest and differentiated according to the origin. Based on the identification process can be known that at Blawan-Ijen, found some sort of rock like a rock breksi, lava stones, silt stones, basalt stones, pumice stone and limestone. So it can be inferred that in Blawan-Ijen there are two types of rocks that is igneous and sedimentary rocks.
The analysis on implementing discovery learning-based learning instruments in improving students’ creative and innovative thinking skills in completing problem of simple multiplication by using jaritmatika
Authors: Triwahyuningtyas R , Dafik  , Prastiti T D 
Published: May 2021

AbstractInnovative creative thinking skills play an important role in supporting students in solving mathematical concepts, especially simple multiplication operational problem withJarimatika. The researchers applied mixed methods with a sequential explanatory design. Research subjects were 28 students in the experimental class and 26 students in the control class. Data were collected through validation sheet, test, documentation, and prerequisite test. The research result indicated that after the implementation of Discovery Learning-based learning instruments, the percentage of students’ innovative creative thinking for the control class was 11.54% for the very creative innovative level, 69.23% for the innovative creative level, 19.23% for the enough innovative creative level, and 0% for less or not innovative creative level. While the experimental class far exceeds the control class, 39% for the very creative innovative level, 57% for the innovative creative level, 4% for the enough creative innovative level, and 0% for less or not innovative creative level. The independent sample t-test score from the post-test shows that there is a significant difference between the control class and the experimental class with a t-count value of -4,965 with a significance value of 0,000. The significance value is smaller than the α value (0.05). This shows that there is an average difference between the control class and the experimental class after receiving treatment (post-test). The negative sign on the t-value indicates that the average experimental class is higher than the control class. It can be concluded that the application of Discovery Learning-based learning instruments can improve elementary school students’ innovative creative thinking skills in solving simple multiplication operation problem withJaritmatika.
Application of central kalimantan coal ash as a sustainable construction material
Authors: Prasetia I , Syauqi M , Aini A S 
Published: May 2021

Abstract
The current study is related to laboratory investigations to utilize Central Kalimantan coal ash as a sustainable construction material, which is green paving blocks. For this purpose, coal ash from the Pulang Pisau coal-fired power plant, both in the form of fly ash and bottom ash, was used as an additional proportion of cement. The addition of fly ash was set at 10%, 20%, and 30%. Meanwhile, the addition of bottom ash was set at 5%. Water to binder ratio (w/b) was set at 0.45, and the curing times were set at 7, 28, and 56 days for all samples. Moreover, the sample’s compressive strength test was based on BS 6717:1986 regarding the precast concrete paving block. Based on the test results, it was proven that the addition of fly ash and bottom ash could increase the compressive strength of paving blocks. The highest compressive test results were obtained from the addition of 20% fly ash and 5% bottom ash (24.62) MPa at the age of 56 days. This result is 30% higher compared to the ordinary paving blocks test result. Furthermore, according to SNI 03-0691-1996, paving blocks with a compressive strength of 20 MPa until 40 MPa can be applied as parking lots pavements.
The community livelihoods strategy as a response to peat swamp forest ecosystem change and Covid-19 pandemic in Ogan Komering Ilir Regency, Indonesia
Authors: Ulya N A , Waluyo E A , Lestari S , Martin E 
Published: May 2021

Abstract
Pressure on peat swamp forests in Ogan Komering Ilir (OKI) Regency for timber extraction, agricultural land, oil palm plantations, and pulp and paper plantation forests cause degradation of peat swamp forest. Communities living around peat swamp forests in OKI Regency are affected by changes of peat swamp forests and Covid-19 pandemic. This study aimed to examine the livelihood strategies of communities around peat swamp forests due to degradation of peat swamp forests and Covid-19 pandemic. The sustainable livelihood analysis was used as an analytical framework in this study. The data obtained were analyzed descriptively qualitatively and quantitatively. The diversification strategy was appropriate to be implemented because it allows the community to achieve improved welfare and be sustainable under peat swamp forest ecosystem change and Covid-19 Pandemic. The diversification strategy also reduced community dependence on natural resource-based livelihoods. Increasing the quality and quantity of human, social, financial, and physical capital were enabling the diversification strategy.
Decomposition rate of some dominant tree species in Low montane forest of Gunung Halimun Salak National Park, West Java-Indonesia
Authors: Rahajoe J S , Susanti R , Simbolon H , Mansur M , Hidayat A , Shiodera S , Suzuki E , Kohyama T S 
Published: May 2021

AbstractThe research of decomposition rate ofAltingia excelsaNoroña, Schima wallichii(D.C.) Korth., Castanopsis acuminatissima(Bl.) A. DC., C. javanica(Bl.) A. DC., andQuercus lineataBlume was carried out in the low montane forest in Gunung Halimun Salak National Park, West Java. The aim of the research was to examine the decomposition rate of dominant species and their role in the nutrient cycling. The decomposition rate of those dominant species was carried out by using the litterbag methods. The highest decomposition rate was observed forQ. lineatafollowed byC. javanica,C. acuminatissima,S. wallichii,A. excelsaand the mixed litter in Cikaniki research station. Meanwhile, in the Wates plot, the highest rate was observed forC. acuminatissimafollowed byC. javanica,Q. lineata,S. wallichii,A. excelsaand the mixed litter. This research shows thatC. acuminatissimadecomposed faster compared to other dominant species due to their litter quality combination of high nitrogen and low lignin content. Carbon and nitrogen released pattern were almost similar for the five dominant species. Based on the decomposition rate and the nutrient released pattern, it showed that the high litter decomposition rate of dominant species contributed to the rapid nitrogen released.
Preliminary study on plant ecology in Tangkahan Area, Gunung Leuser National Park
Authors: Susanti R , Pratama BA , Rahmawati K , Suzuki E 
Published: May 2021

AbstractGunung Leuser National Park (NP) is the biggest NP in North Sumatra. Though very few plant ecological studies were conducted there. Most studies in Gunung Leuser NP are related with protected animals, such as Sumatran Tiger, Elephant or Orang Utan. Thus, the aim of this preliminary study is to understand the plant structure and composition in the tropical forest of Gunung Leuser National Park. A 0.5-ha plot was established near Gua Kambing, Tangkahan area in November 2015. All tree species bigger than 15 cm girth were recorded, measured, and identified. The dominant species were from Dipterocarpaceae, followed by Myrtaceae and Achariaceae. The total number of trees was 693 trees or 1,386 trees/ha with the total Basal area was 42.9m2/ha and the biggest diameter was 147cm. The results from diversity index analysis ((H’=4.43; D=0.97; α=75) confirm that the forest area had a relatively high diversity, withAgrostistachis sessilifoliadominates the understory layer. The Gua Kambing area had relatively high plant diversity, less disturbance, and bigger trees than other studied areas in tropical Indonesian forests in Sumatra.
Antioxidant activity of endophytic fungi from young and old leaves of cinnamon plants from Bogor, Indonesia
Authors: Septiana E , Bustanussalam  , Yadi  , Rachman F , Hapsari Y , Izzati F N , Rahmawati S I , Simanjuntak P 
Published: May 2021

Abstract
In addition to the bark, the leaves of the cinnamon plant are a source of natural antioxidant compounds and inhabited by endophytic fungi. The use of endophytic fungi from cinnamon leaves as a source of antioxidant compounds is not much done. This study aimed to determine the antioxidant activity of endophytic fungi were isolated from young and old leaves of cinnamon plants. Isolation of endophytic fungi was done by planting leaf tissue on Potato Dextrose Agar media after surface sterilization with 70% ethanol for 1 minute, 5.3% sodium hypochlorite for 5 minutes, and 70% ethanol for 30 seconds, respectively. Antioxidant activity is carried out based on the α, α-diphenyl-β-picrylhydrazyl free radical scavenging method. The ethyl acetate extract of endophytic fungi with the highest antioxidant activity on each type of leaf was carried out by profiling chemical compounds using GCMS. The extracts of eight endophytic fungal isolates obtained had antioxidant activity. Cb.Dm3 and Cb.Dt2 endophytic fungal extracts had the highest antioxidant activity with IC50 values of 62.80 and 8.11 µg.ml−1, respectively. Profiling chemical compounds showed that both isolates contained antioxidant compounds with Cb.Dt2 isolate containing cinnamaldehyde. Cb.Dt2 endophytic fungal extract has the potential as a potential source of natural antioxidant compounds.