bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimization of Primary Frequency Regulation of 650MW Thermal Power Plant
Authors: Liu En ren , Li Jun , Gao Song , Meng Xiang rong , Shi Shuo , Yu Qingbin , Li Yuan yuan , Yan Qing 
Published: March 2021

Abstract
Wind power and photovoltaic power generation are developing rapidly, and installed capacity accounts for an increasing proportion of the power system. However, most new energy power stations are not equipped with energy storage equipment. Wind power and photovoltaic power generation do not yet have primary frequency modulation capabilities. For a long time in the future, the participation of thermal power generation in primary frequency modulation will still be the main method of primary frequency modulation in my country. The primary frequency regulation capacity of the combined heat and power unit often fails to meet the requirements due to heating. This article takes a 650MW thermal power heating unit as an example, and optimizes the primary frequency regulation of the unit. After optimization, the primary frequency regulation capacity of the unit is greatly improved. The optimization method in this paper has certain guiding significance for the optimization of primary frequency regulation of other heating units.
A high isolation RF switch designed for amorphous flat air-ground ad-hoc network platform
Authors: Zhu Weizhi , Yu Jianguo , Wang Zhifang , Bi Kun 
Published: March 2021

Abstract
In this paper, a single-pole, double-throw (SPDT) RF switch is designed for the amorphous flat air-ground ad-hoc network platform, which is used to connect the node, low noise power amplifier and power amplifier. The switch controls the transmission and reception of signals in the node according to the variation of excitation voltage. The simulation results show that the RF switch insertion loss is less than 1.5dB, isolation is more than 40dB and the 0.1 dB compression is 38dBm in the frequency band 2.4GHz to 2.5GHz, which can meet the requirements of the ad-hoc network platform. Networking tests results showed that the topology of ad-hoc networks remains stable within a certain distance and the direction of signal in the node is controlled by the switch.
Research on the System Safety Assessment of Aero Engine based on the Monte Carlo
Authors: Fang Guo , Huiyun Yang , Jiawei Liu , Zijiang Yang 
Published: March 2021

Abstract
The process of research and development on the aero engine is complicate and iterative. Essentially system safety assessment is an indispensable part of the development process. Taking safety assessment of “Extinguishing lapsing when Request” as an example, this paper develops a Monte Carlo calculation model which calculates the probability combination of basic events as the security requirements from top event change. The Monte Carlo model offers a method to calculate from top events request to the basic events.
Integrate health into decision-making to foster climate action
Authors: Vandyck Toon , Rauner Sebastian , Sampedro Jon , Lanzi Elisa , Reis Lara Aleluia , Springmann Marco , Dingenen Rita Van 
Published: March 2021

Abstract
The COVID-19 pandemic reveals that societies place a high value on healthy lives. Leveraging this momentum to establish a more central role for human health in the policy process will provide further impetus to a sustainable transformation of energy and food systems.
Rotating maize reduces the risk and rate of nitrate leaching
Authors: Pasley Heather , Nichols Virginia , Castellano Michael , Baum Mitchell , Kladivko Eileen , Helmers Matthew , Archontoulis Sotirios 
Published: March 2021

Abstract
There is a strong link between nitrate (NO3-N) leaching from fertilized annual crops and the rate of nitrogen (N) fertilizer input. However, this leaching-fertilizer relationship is poorly understood and the degree to which soil type, weather, and cropping system influence it is largely unknown. We calibrated the Agricultural Production Systems sIMulator process-based cropping system model using 56 site-years of data sourced from eight field studies across six states in the U.S. Midwest that monitored NO3-N leaching from artificial subsurface drainage in two cropping systems: continuous maize and two-year rotation of maize followed by unfertilized soybean (maize-soybean rotation). We then ran a factorial simulation experiment and fit statistical models to the leaching-fertilizer response. A bi-linear model provided the best fit to the relationship between N fertilizer rate (kg ha−1) and NO3-N leaching load (kg ha−1) (from one year of continuous maize or summed over the two-year maize-soybean rotation). We found that the cropping system dictated the slopes and breakpoint (the point at which the leaching rate changes) of the model, but the site and year determined the intercept i.e. the magnitude of the leaching. In both cropping systems, the rate of NO3-N leaching increased at an N fertilizer rate higher than the N rate needed to optimize the leaching load per kg grain produced. Above the model breakpoint, the rate of NO3-N leaching per kg N fertilizer input was 300% greater than the rate below the breakpoint in the two-year maize-soybean rotation and 650% greater in continuous maize. Moreover, the model breakpoint occurred at only 16% above the average agronomic optimum N rate (AONR) in continuous maize, but 66% above the AONR in the maize-soybean rotation. Rotating maize with soybean, therefore, allows for a greater environmental buffer than continuous maize with regard to the impact of overfertilization on NO3-N leaching.
Reduction and reconstruction of SDEs via Girsanov and quasi Doob symmetries
Authors: De Vecchi F C , Morando P , Ugolini S 
Published: March 2021

Abstract
A reduction procedure for stochastic differential equations based on stochastic symmetries including Girsanov random transformations is proposed. In this setting, a new notion of reconstruction is given, involving the expectation values of functionals of solution to the SDE and a reconstruction theorem for general stochastic symmetries is proved. Moreover, the notable case of reduction under the closed subclass of quasi Doob transformations is presented. The theoretical results are applied to stochastic models relevant in the applications.
Filling space with polydisperse spheres in a non-Apollonian way
Authors: Botet Robert , Kwok Sylvie , Cabane Bernard 
Published: March 2021

Abstract
Completing a Swiss-cheese theorem of Lieb and Lebowitz (LL), we prove that any population of spheres with power-law radius distribution

∝

1
/

r

d

f

+
1

can completely fill 3D Euclidean space if the exponent is such that 2.8 ⩽ d
f < 3. This sufficient condition extends considerably the known part of the ensemble of space-filling populations of polydisperse spheres. The self-similar spatial arrangement of the polydisperse spheres related to the theorem is discussed using a numerical example with d
f = 2.875. By calculating the small-angle scattering structure factor of the resulting packing, we found it to present several crystalline peaks indicating some regularity. This is significantly different from the featureless structure factor of an Apollonian packing which represents total disorder. We thereby argue that the LL algorithm for filling space with spheres is fundamentally different from Apollonian constructions.
The distributional pattern of zooplankton community in beratan lake, bali
Authors: Atmaja D M , Budiastuti M S , Setyono P , Sunarto  
Published: March 2021

Abstract

Zooplankton is an important component in water ecosystem that has a distribution in spatial and time scale. The distribution and diversity of zooplankton as one biological indicator of quality of the water way. This study was aimed at looking at the description of the distributional pattern and the abundance of zooplankton and Beratan Lake. Five sampling stations were determines based on the deeps of the lake using the field survey method, i.e., LB 1, LB 2, LB 3, LB 4 and LB 5. The zooplankton sample was taken from each stations by using Chaoborus net NXX 10 (the eye of the net size was 132 µ, then the zooplankton was preserved with 4% formalin solution. After being identified, there was five species, 4 Cladocera species and 8 rotifera species. The highest of abundance for copepod group was Thermocyclops. Diaphanosoma was Cladocera group which was mostly found. Conochilus unicornis was the most dominant rotifer.
Modified estimation of land values with spatial weight in bandung city
Authors: Sugito N T , Soemarto I , Hendriatiningsih S , Leksono B E 
Published: March 2021

Abstract
Land valuation is one aspect of a cadastral system that is integrated with land use and land tenure. Land can be valued based on the benefits that can be given. High and low land values are influenced by many factors, including economic, social, government, and physical factors. Based on factors that can determine the value of land, it is known that land use (zoning) can also affect the formation of land values. Several studies have stated that land use is the most dominant factor affecting land values. This study uses geostatistical analysis in modeling soil values. The purpose of this research is to modify the mathematical model of soil values from geostatistical analysis by including spatial weights. The mathematical model of the modified land value is expected to reflect the actual value, which can then be used in creating a Land Value Zone.
The utilization of kesumba seeds for coloring Biawak (varanus salvator) leather with dyeing and finishing methods based on environmentally friendly
Authors: Darmawati E , Yuhana S , Sutopo  
Published: March 2021

Abstract
The aim of the study was to utilize kesumba seeds (Bixa orellana L) for coloring Biawak (Varanus salvator) leather dyeing and finishing methods against color fastness based on environmentally friendly. The ingredients used are kesumba seeds, Biawak leather, binder from white part of egg. Using the experimental methods, with four phases :(1) extraction of kesumba seeds wet and dry, (2) dyeing methods variations: (a) dye concentration from kesumba seeds, (b) dyeing durations (c) temperature (°C), Rpm of the drum 12, and crust Biawak leather, (3) finishing method using binder from white part of egg, and (4) testing Absorption and color fastness test on wet and dry rubbing, the assessment standard uses a gray scale and staining scale. Data analysis using Analysis of variance. The results shows that there significant differences in color absorption in the flash asverages are 80-70 % and nerf asverages are 60-40%, and results of Biawak leather fastness test for dyeing and finishing methods, dried kesumba seeds concentration 9%, dry rubbing discoloration 4-5 (good) fastness, orange-yellow color on the leather and wet kesumba seeds concentration 6%, 3-4 fastness (good enough), orange-red color on the leather and the results of wet rubbing are found to have an average color fastness value of 3 (enough) for wet and dry kesumba. It can be concluded that coloring from kesumba and binder material ingredients based on environmentally friendly can be used as a dyeing material and also for finishing as an alternative substitution of synthetic dyes in the Leather Industry.
Managing sewage treatment facilities using geographical information system application: a user requirement analysis in state of Penang, Malaysia
Authors: Idris M Z , Suratman R , Samsudin S , Zaini F 
Published: March 2021

Abstract
Rapid development of economy in Malaysia and the large city scale expansion has led to increase in number of domestic sewage and industrial water waste. In managing sewage treatment facilities, Indah Water Konsortium Sdn Bhd (IWK) has developed the Integrated Geographical Information System (IGIS) to help them in decision making process. The face to face interview method with IGIS users has been used in getting the feedback on examining the main attribute data needed and then analyze it by using content analysis. It is conducted by updating the required attribute data into the IGIS application and removing unrelated attributes. In addition, the spatial information that can help to improve the IGIS application also be included in new version. Based on the findings of this paper, the improvement of this information will help the IWK to manage this sewerage system more effectively and to control the increasing number of sewerage treatment plant (STP). The upgraded IGIS application improves the management efficiency, management level and decision-making capacity of sewage treatment in state of Penang and provide a good demonstration and reference in sewage treatment infrastructure in others city.
The impact of ecotourism on the water quality in sedim river, kedah, malaysia
Authors: Hashim M , Ali M S M , Nayan N , Mahat H , Saleh Y , Norkhaidi S B , See K L , Said Z M 
Published: March 2021

Abstract
This study was aims to evaluate the impact of ecotourism on the water quality in the Sedim River Recreation Centre, Kulim Kedah, Malaysia. Ecotourism activity development, such as chalet construction, homestay, recreation for picnics, kayaking and proper disposal of solid wastes in the area, will affect the quality of Sedim River. The period of this study was conducted between February to April 2018, with six time water sampling during this period. Sample water quality was then analysed using the Water Quality Index (WQI) in situ and in the laboratory, as set by the Malaysian Department of Environment. Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Ammonia Nitrogen (NH3N), pH and Suspended Solid (SS) were used as water quality parameters. The findings show that the value of WQI Sedim River is in Class I and II, with WQI=92.3 as an average value that safe for raw water supply, suitable for fish rearing and water activities such as water rafting and kayaking. This shows that the unpolluted and clean status of the Sedim River water allows ecotourism activities to go further and at the same time can attract foreign tourists to come. Although, management will have to take more precise measurements of the water and plan for any development activities to be undertaken in the future to maintain the clean condition status of the Sedim River water quality.
Care environment attitudes of high school students in surakarta city 2019
Authors: Rahmadi I W , Sarwono  , Muryani C 
Published: March 2021

Abstract
This study aims to determine the environmental care attitude of the XI grade students of Surakarta city high school conducted in July 2019 with quantitative descriptive approach. The population is all public high school students in Surakarta. Samples were taken from 4 public high schools using the simple random sampling method. Data collection using a questionnaire. The results of the study indicate that: indicators (1) Working hard in protecting nature is included in a good level; indicator (2) Thinking far ahead includes a good level; indicator (3) Appreciating hygiene health including good levels; indicator (4) Environmental responsibility is included in the good level. Thus the overall level of environmental awareness of high school students in Surakarta is included in the good level.
The actualization of student’s disaster preparedness at the elementary and secondary education level of disaster-aware school
Authors: Wardana S , Herdiansyah H , Wicaksono A 
Published: March 2021

Abstract
As a country located in the ring of fire, the Republic of Indonesia is one of the countries with the highest potential status of disasters in the world and causes great material and moral damage. This phenomenon is one of the big challenges in achieving national development goals. Among the efforts to reduce the impact of disasters is to increase disaster preparedness by all elements of society, especially in the education sector through the application of the concept of Environment and Disaster Mitigation-Based School (SWALIBA). The big goal to be achieved from the application of the SWALIBA concept is to shape the attitude and mentality of disaster preparedness from an early age. This research focuses on measuring the level of disaster preparedness for elementary and middle school students in the central part of Java who have applied the SWALIBA concept. The method used in this study is structured interviews and systematic measurements using a questionnaire to analyze and find scientific correlations between school strategy variables and the level of student disaster preparedness. The results showed that although students’ perception of disaster preparedness began to take shape, it had not yet reached the expected level of disaster preparedness.
Spatial thinking profile for 2017 surakarta senior high school
Authors: Imaniar N , Karyanto P , Yusup Y 
Published: March 2021

Abstract
This study aims to analyze the profile of Spatial Thinking in Surakarta Senior High School. This research is a descriptive study to obtain Spatial Thinking data in Surakarta Senior High School 2017. The assessment using 8 aspects of spatial thinking abilities covered by STAT include comprehending orientation and direction; comparing map information to graphic information; choosing the best location based on several spatial factors; imagining a slope profile based on several spatial factors; correlating spatially distributed phenomena; mentally visualizing 3-D images based on 2-D information; overlaying and dissolving maps; comprehending geographic features represented as point, line,or polygons. The results of the study indicate that Spatial Thinking in Surakarta Senior High School 2017 is relatively low, as evidenced by the average score of the ability to comprehending orientation and direction aspect which have a mean score above standard average of 74,9. The lowest aspect is visualizing 3-D images based on 2-D information of 11,2, these findings will be used as a basis for further research on innovative learning models and strategies that can improve cognitive abilities and Spatial Thinking in high school students.
Collaboration learning: project-based learning and local wisdom
Authors: Nurdiansah N , Kartadinata S , Maryani E , Supriatna N 
Published: March 2021

Abstract
The application of the understanding of ecoliteracy in schools is a problem that is widely studied to make students able to live and feel the pleasure of the surrounding environment. This study aims to improve students’ understanding of ecoliteracy. This research was conducted using a medote survey of 50 elementary school students in Tasikmalaya District Indonesia. The results of the study illustrate that project-based learning in elementary schools that collaborate with the local wisdom of the Kampung Naga make learning more active, enthusiastic, and happy. The learning situation certainly has an effect on their understanding of ecoliteracy, so it can be concluded that project-based learning that collaborates with the local wisdom of the Kampung Naga has improved the participation of student ecoliteracy.
The role of education and geography on disaster preparedness
Authors: Maryani E 
Published: March 2021

Abstract
The preparedness of disaster is important to be socialized as Indonesia is one the most disaster-prone are. One way to improve this preparedness is through education. The purpose of this study is to analyse the school curriculum relating to the disaster preparedness and to find out the way disaster material delivered by the teacher. The method used was descriptive qualitative. The data gained through documentation, literature review, and interview. The result shows that disaster material was not optimally discussed in the school curriculum. The teachers’ understanding of the material were also considered as low. They also did not use various learning media to give the understanding to the student of the importance of disaster preparedness.
Conceptual interpretation seismic 3d using rms amplitude and dip-azimuth attribute analysis for identification structure and facies model in physical geographic
Authors: Pamungkas T D , Nandi  , Ridwana R 
Published: March 2021

Abstract
Interpretation of seismic 3D data using attributes analysis to determine the condition of the subsurface geology and distribution facies as physical geography study. The results of interpretation formed surface horizon analysis of structures located in the southwest (SW) is the high of the continuous anticline to the northeast (NE) and the structure of the valley are in the south (S) continuously until the northeast (NE). From the results of the RMS amplitude attribute map shows that high amplitude anomalies uneven section southwest (SW). Show areas indicated as coal facies deployment area and assuming a low impedance possibility for the existence of coal facies. The map dip, azimuth, dip-azimuth can be analyzed map depicts stance or azimuth direction and dip (slope) time domain structure with angle pattern shown seismic trace with section 4501 and the arbitrary line a - b and line c - d clarify seen a pattern of fractures (faults) on a small scale where the direction nearly perpendicular to the strike of major fault.
A numerical study of tidal run up and inundation impact using logical tool-less than equal
Authors: Trihatmoko E , Pratiwi E S , Juhadi  , Sanjoto T B , Sunarto  , Marfai M A 
Published: March 2021

Abstract
Kendal Regency as Special Economic Zone and Industrial Park is stimulating the rapid coastal urban growth. This condition initiates the high risk of disaster in the northern Central Java. The research aims to model the tidal run-up and spatial inundation distribution using numerical calculation of logical tool-less than equal and to identify the land uses that are affected by the tidal run-up and inundation in the Kendal coastal area. This research conducted by the digital elevation model in 7 m spatial resolution and the highest high-water level (HHWL) data in the one-year analysis. Furthermore, the data processing was run using Less than equal tools. The result showed that the HHWL condition in 2018 reached up to 0.35 m. Considering the HHWL data, the eastern coastal area of the Kendal Regency is massively being affected by the tidal run-up and inundation. The furthest distance of the tidal run-up and inundation reached up to 3.7 km. There are six land uses affected, i.e., built-up area (0.04%), garden (2.01%), dry land (4.89%), grassland (5.09%), a fish pond (41.95%), and paddy field (4.24%).
Resilience in the face of flash floods, landslides and mudflows: the experience of tourist spots in cameron highlands
Authors: Leh F C , Mokhtar F Z 
Published: March 2021

Abstract
The flash floods, landslides and mudflow in Cameron Highlands are catastrophes which threaten local life and economic activities which depend on tourism activities. Several series of flash floods, landslides and mudflows which occurred in 2014, 2016 and 2018 in Cameron Highlands illustrate that they are the biggest threat to the highland tourism spot in the coming future. This tourist spot may face the risk of being unvisited for a while because of the untreated conditions after the flash floods, landslides and mudflows. This article aims to describe a brief historical summary of flash floods, landslides and mudflows in Cameron Highlands and how this disaster can threaten the readiness of activities in other highland tourism sites. The discussion focuses on the process of building resilience to flash floods in the Cameron Highlands over the last few years. This article ends with a discussion on the challenges to be undertaken in the process of enhancing Cameron Highlands as a highland tourism destination. The discussion suggests that the approach towards achieving sustainable tourism development goals especially in Cameron Highlands should return to the original goal of tourism development with its aim to minimize the environmental impact and protect the human habitat.