bluuebunny/crossref_metadata_2025 huggingface dataset:
The effect of sodium metabisulfite concentration and drying time on the quality of coconut sugar
Authors: Kurniawati E , Karimah R N , Suryana A L , Destarianto P , Oktafa H
Published: April 2021

A study on the effect of sodium metabisulfite and drying time on the quality of coconut sugar has been conducted. The objectives of this research were to determinate the effect of metabisulfite dan drying time to obtain optimum characteristic of coconut sugar. The research method includes the preparation of tapping coconut sap, processing crystal, and drying using modified oven method. The study used a randomized block design of two factors. The first factor is addition of sodium metabisulfite in several concentration (0,1%, 0,2%, 0,3%) and the second factor is drying time (air drying, 15 minutes, 30 minutes) in 3 repetitions. Parameteres being analyzed were moisture, ash content, reduced sugar content, and yield. Sensory analysis measured color, taste, aroma, texture. The best results are addition of sodium metabisulfite 0,2% and drying time in 15 minutes. The best treatment showed that the contains 2,41% moisture, 1, 77% total ash, 3,34% sugar reduction, yield 82%. Sensory analysis showed that had likely score for color, taste, and aroma. Keywords: coconut sugar, drying time, sodium metabisulfite.
Optimization of making white oyster mushroom with the effect of immersion time and concentration of natrium metabisulphite
Authors: Suratno  , Kurnianto M F , Bachri S , Hariono B , Brilliantina A
Published: April 2021

White oyster mushroom is a plant that is processed into a variety of food. It damages the shelf life of white oyster mushrooms itself after being harvested. The white oyster mushroom has high water content, so necessary to extend its shelf life. The objectives of the study were 1) To decide the effect of different soaking time and sodium metabisulfite concentration on the quality of the flour. 2) Knowing the best treatment between soaking time and different Sodium metabisulfite concentrations on flour making. The method used in this research is an experimental research method with a randomized block design (RBD) using two factors. The first aspect was the immersion time of 5, 10, and 15 minutes. The second aspect is the concentration of sodium metabisulfite as much as 0 ppm, 200 ppm, 400 ppm, and 600 ppm, then the drying process is carried out at 45°C, 55°C, and 65°C. The results of data analysis got the best treatment at a concentration of 600 ppm of sodium metabisulfite with a long soaking time of 10 minutes at a temperature of 55°C protein, the protein content of 1.25%, water content of 4.1% with the whiteness of 83.49.
Selection of plantain cultivars as raw material for ripe plantain flour
Authors: Mayasti N K I , Kumalasari R , Ekafitri R , Desnilasari D , Surahman D N , Wahyuni A S
Published: April 2021

Ripe plantain flour is a diversification of food products based on ripe plantains. Processing plantains into flour can increase the added value of banana/plantain commodities. This study aims to obtain the best plantain cultivars as raw material for ripe flour and to determine the quality of selected ripe plantain flour. Plantain cultivars used in this study were tanduk cultivar (Musa acuminata xMusa balbisiana (AAB) cv. ’Tanduk’), kapas cultivar (Musa acuminata x Musa balbisiana (AAB) cv. ’Kapas’), siam cultivar (Musa acuminata x Musa balbisiana (ABB) cv. ’Siam’), kepok putih cultivar (Musa acuminata x Musa balbisiana (ABB) cv. ’Kepokputih ’), and raja bulu cultivar (Musa acuminata xMusa balbisiana (AAB) cv. ‘Raja Bulu’). Each treatment were repeated three times. The method used in this study was the De Garmo method. Product selection was determined based on the weight of each product on certain parameters. The highest product value was the selected product. The results showed that the tanduk plantain cultivar was the best cultivar for ripe plantain flour. Tanduk flour has a yield (15.218%), color (L = 54.226), moisture content (8.914%), starch (60,267%), hygroscopic (0.1173 g moisture/100 g dry solid), peak time (6.889 minutes), pasting temperature (94.800 ° C), and organoleptic with an average value of color attributes (5.3), aroma (4.4), overall (4.7).
Analysis of integration dietducate and automated meal planner for nutritional purposes
Authors: Iqbal M , Permadi M R
Published: April 2021

Dietducate is considered necessary to develop a meal planning feature in order to minimize Nutrition Care Process (NCP) manually since manual work may carry high risk of human error and it takes a long time so as causing malnutrition to patients. The purpose of this research was to develop and evaluate the feature of Automated Meal Planner (AMP) in Dietducate android app. This type of research is Research and Development with ADDIE model. After developing the app, a survey was conducted to respondents (nutritionists) who have used the AMP feature. Respondents were collected by means of purposive sampling technique, and then given questionnaires containing how much they agree with various aspects. Data analysis was done by descriptive statistics. Based on the need analysis, there were 14 functions needed in developing this AMP feature. In addition, AMP feature could be integrated with Dietducate app well and could help in meal planning function. The evaluation result of AMP product implementation showed that the majority of respondents took the AMP as a simple, practical app with well-arranged app structure, good display, and easy to use.
Nitrogen and biodegradator application to trigger ratoon growth and production of rice (Oryza Sativa)
Authors: Damanhuri  , Widodo T W
Published: April 2021

Increasing the rice harvest index to 5 times a year through ratoon system was an effort to fulfill food sufficient. Currently, ratoon productivity was only 40-50% lower than it’s parent plant. Utilization of rice stump biodegradator and nitrogen in the ratoon system could be applied to increase ratoon productivity. The aimed of this research was to trigger tillers formation and production of ratoon through application of biodegradator and nitrogen. The experiment arranged in split plot design. The first factor was time of biodegradator application (main plot), i.e at harvest, 3 days after harvest, and 6 days after harvest, while the second factor was time of nitrogen application (sub plot), i.e 3 days before harvest, at harvest, and 3 days after harvest. The dosage of biodegrator and nitrogen were the same for all treatments, i.e 2.2 ml.plot−1and 8.3 g N.plot−1respectively. Collecting data was consisted of number of tillers, number of productive tillers, number of leaves, number of grains per panicle, and weight of 1000 seeds. The results showed that all data observed were non-significantly different among treatment of biodegradator, nitrogen, as well as the combination. It was assumed that the dosage of biodegradator and nitrogen were not sufficient to trigger tillers formation of ratoon, so that the effect of application time of biodegradator and nitrogen were not significant.
On-line monitoring system in greenhouse area for chrysanthemum cultivation based on raspberry pi and iot
Authors: Riskiawan H Y , Anwar S , Kautsar S , Setyohadi D P S , Arifin S
Published: April 2021

Chrysanthemum plants generally grow well when cultivated at an altitude of 650-1200 m above sea level. Chrysanthemum plants come from subtropical climates, with temperatures ranging from 17-30 C. whereas, in Indonesia, which is a tropical region, it is 20-26 C. The humidity needed by chrysanthemum plants at the time of planting is 90-95%, while at the time of enlargement and chrysanthemum flower growth of 70-80%. To get optimal results, chrysanthemum plants need to be cultivated in a greenhouse area. In a greenhouse, temperature and humidity can be controlled. In addition, chrysanthemum plants are also more protected from pests. In this paper, an on-line greenhouse monitoring system is developed. The system is equipped with sensors for temperature, humidity, soil humidity, light intensity, and an RGB camera. Sensor data is sent to the cloud database via raspberry pi. Data is displayed in graphical form every 1 hour. The sensor data can be accessed from anywhere via the internet network and can be used for the analysis of crop yields based on greenhouse conditions during cultivation.
Liquid load optimization of unmanned aerial vehicle for foliar fertilizer
Authors: Purnomo F E , Afriansyah F L
Published: April 2021

Unmanned Aerial Vehicle is a multirotor vehicle with more than one rotor to produce lift for the vehicle to fly in the air. Multirotor has become the object of research, one of which is in agriculture. Fertilization is more concerned about liquid fertilization, which is directly spraying on the leaves or foliar fertilizer. Foliar fertilizer sprayed with the hope that the stomata on the leaves can directly absorb the nutrients given. The UAV will fly carrying liquid (liquid) foliar fertilizer and spraying it on a predetermined land using a flight path that has been programming in the UAV. In previous research, we have used a multirotor type UAV combined with a foliar spraying system with a 1-liter liquid fertilizer, which can only spray land with a limited area. The limited liquid capacity will be a problem for the UAV because it is necessary to fill the liquid many times if used to spraying a wider area. Therefore, it is necessary to optimize the liquid load on the UAV so that its capacity will increase. If UAV’s liquid foliar fertilizer’s capacity increases, it will increase the area of foliar fertilizer spraying. This research focuses on increasing the UAV’s lift capacity and designing a UAV system equipped with a sprayer. The increase in lift is related to the payload to be carried by the UAV. This research targets to optimally increase the load of liquid foliar fertilizer. In this research, the UAV was designing using a multi-rotor type. The measurements taken are the success rate of the system in flying over the crop field, testing the measurement of power, current, battery capacity, and different loading 40, 45,50, 55 percent of the total weight from an unmanned aerial vehicle.
Development of personal integrated sterilization machine for new normal phase preparation of the 2019-nCoV outbreak
Authors: Hariono B , Mahanani R S , Nusantoro S , Kautsar S
Published: April 2021

The disease outbreak caused by the 2019-nCoV virus is growing so rapidly that the WHO has categorized this outbreak as a pandemic. In Indonesia, as of March 24, 2020, there were 686 patients who tested positive for the 2019-nCoV virus with 55 deaths. This has made the government extend the disaster period of the Coronavirus outbreak until the end of May 2020. Various efforts have been made by the Indonesian government, such as: opening emergency hospitals, implementing social distancing, and preventing viruses by spraying massive disinfectants. Disinfectant spraying is carried out using the help of a fire engine or using a spray device. Spraying of disinfectant is carried out on public roads and public spaces. Indonesia is starting to prepare for the new normal phase in the midst of the coronavirus pandemic which continues to infect millions of people in the world. The government has instructed that this new phase of normality can be well prepared. For the readiness of the new normal corona, the Ministry of Health and the Task Force for the Acceleration of Handling Covid-19 have compiled health protocols such as washing hands, maintaining distance, coughing, and sneezing ethics, and wearing masks. Based on the problem, an integrated sterilizer machine was developed. It can be used for workers during the New Normal phase. The machine is equipped with an automatic handwashing device, an automatic temperature gauge, and a UV booth for sterilizing goods carried by workers at Politeknik Negeri Jember.
The agronomy performance and resistance to brown planthopper on superior rice varieties in bali province, indonesia
Authors: Suastika I B K , Aryawati S A N , Suryawan I B G , Sari A R K
Published: April 2021

Research was conducted in Subak Guama, Selanbawak Village, Marga District, Tabanan Regency from January up to April 2017 and Subak Dlod Sema, Sading Village, Mengwi District, Badung Regency from January up to May 2017. This study aims to understand the growth, productivity and resistance to brown planthopper pest in superior rice varieties cultivated in Bali Province, Indonesia to substitute Ciherang variety utilization. Research were arranged by using Randomized Block Design with some superior rice varieties as treatment namely Inpari 30 and Inpari 40 for research in Tabanan Regency. And also, Inpari 16, Inpari 24, Inpari 28, Inpari 30, Towuti and Situ Bagendit for research in Badung Regency. Meanwhile, Cigeulis and Ciherang were utilized as comparison. Each of treatments were replicated for 5 times. Variable observed consisted of performance of agronomy and productivity namely plant height, number of tillers, number of grains per panicle, 1000 grains weight and yield. Besides that, resistance to brown planthopper pest also observed by evaluation of damage per plant caused by brown planthopper with using six scale standard of scoring. Results showed that Inpari 40, Inpari 28 and Situ Bagendit were resistant to pest of brown plathopper according to their percentage damage were 1%; 9% and 1% with scoring rate were 1; 3 and 1 respectively. Inpari 40 and Inpari 30 can be considered as candidate to substitute Ciherang according to their agronomy performance and productivity in Bali Province were closest similar to Ciherang variety meanwhile Inpari 40 was most suitable to substitute Ciherang variety according to its agronomy performance, productivity and resistance to pest of brown planthopper.
Exploration of agricultural waste as biochar to increase soil fertility of udipsamments in Jember district
Authors: Sugiyarto  , Salim A , Firgiyanto R
Published: April 2021

The problem in agricultural production activities that have been found in Jember district is the existence of agricultural land function experts with characteristics of productive land with good irrigation channels for various uses. Therefore, it is necessary to use marginal lands for agricultural extension activities, for example by utilizing coastal land with the Udipsamments soil type which has various eradicating factors for agricultural cultivation through the provision of soil amendment material in the form of biochar by utilizing agricultural waste. The purpose of this research is to obtain biochar raw material with high absorption power to store nutrients and a place to develop microorganisms; know the physical and chemical properties of biochar from agricultural waste. This research activity will be carried out from May to November 2020. This research activity begins by looking for agricultural waste that has the potential to be used as a biochar material. Through the pyrolysis process, selected agricultural waste is processed into biochar and then tested for its physical and chemical properties. The analysis results show that the selected agricultural waste can be used as biochar with sufficient quality as an ameliorant for Udipsamment soil.
Supporting organic rice exports: the success story of West Java organic rice exports
Authors: Saliem H P , Susilowati S H , Ariningsih E , Agustian A , Muksin
Published: April 2021

Organic rice has been developed in various regions in Indonesia, where West Java is the largest organic rice producing center. The organic rice market’s development trend has increased significantly from year to year but faces competition from other ASEAN countries. This study aims to formulate an export strategy for Indonesian organic rice, particularly West Java. The research locations are Tasikmalaya and Bandung Regencies. The survey was conducted in March-October 2018. Data and information were collected at the provincial and regency levels through in-depth interviews with respondents related to organic rice development, including farmers, administrators of farmer groups/farmer groups association, and traders. SWOT analysis was employed in processing the data and information. The analysis results show that organic rice exports are in the Strength – Threat (S – T) quadrant, which indicates that the organic rice export strategy has a decisive strength factor but faces significant challenges. The main strategy needed to encourage organic rice exports is to take advantage of the strength of support from the Regional Government in developing organic rice to overcome the threat of expanding organic rice from other producing countries with higher competitiveness.
Toxicity of sphagneticola trilobata extracts against spodoptera litura larva
Authors: Firmansyah E
Published: April 2021

Spodoptera litura is one of the polyphagous pests that cause damage to many agricultural commodities. Chemical control method was known as a major method use by farmers. Application of plant-based insecticide is an effort to decrease the negative effects of using synthetic insecticides. Sphagneticola trilobata is a weeds species which has potential to use as plant-based insecticides material. This study aims to determine the toxicity of S. trilobata extract in S. litura, as an effort to obtain alternative control materials that are more environmentally friendly. The material used is the leaves and flowers of S. trilobata extracted using water. The treatment concentration consisted of control, 20 ml / l, 40 ml / l, 60 ml / l, and 80 ml / l which were repeated 5 times. The application method used is the residual method on the leaves. Mortality data were analyzed using probit analysis to obtain a Lethal Concentration 50 (LC50) value. The results showed that flower extract was more toxic compared to leaf extract with LC50 value of 277.5 ml / l.
Optimization of energy efficiency in natural gas liquefaction process using plantwide control method
Authors: Biyanto T R , Cordova H , Matradji  , Priambodo K , Sarah A Z , Hermantara R C , Sitorus C D
Published: April 2021

The use of hydrocarbon energy is still very dominant, where the most efficient hydrocarbon energy is natural gas. In the process of distribution, natural gas must be cooled first to become liquid or commonly referred to as LNG. The natural gas liquefaction process consists of three parts, namely the propane cooling cycle by sea water, the MCR cooling cycle by propane, and the natural gas liquefaction cycle by MCR. The design of PWC on LNG aims to increase the efficiency of energy consumed so that the maximum profit can be obtained and to increase the plant stability when given disturbances. The results of the PWC design on a 5% increase in feed is able to reduce the energy use by 85,867,151 kJ / hour and increase the profit by 2,010,321,775 rupiah / day. While the 5% decrease in feed can reduce energy use by 96,297,243 kJ / hour and increase the profit by 2,254,511,068 rupiah / day. The application of PWC is able to produce a stable system response when a disturbance test is done, proven by the decrease of settling time and overshoot, also eliminating the steady state errors compared to PID control before using the PWC design.
Method for determining the loads on the deflection module of the push-the-bit rotary steerable system
Authors: Epikhin A. , Zhironkin V. , Szurgacz D. , Trzop K.
Published: April 2021

The article presents a method for calculating the loads on the blades - elements of the deflecting module of the push-the-bit rotary steerable system for directional drilling of oil and gas wells, affecting its reliability. It is shown that the reliability of rotary steerable systems is of particular importance as the development of unconventional oil fields expands - a highcost process that increases attention to specific factors of reliability of drilling equipment. A feature of the method for calculating the loads on the deflecting blades proposed by the authors is the representation of the rotary steerable system as an absolutely elastic rod, which is acted upon by a complex of forces arising from the directional wells with horizontal wavy segments. As a result of calculations, conditions were determined under which the interaction of forces acting on the deflecting blades will create a load close to the maximum permissible values, which increases the risk of failure of the entire bottomhole assembly of the rotary steerable system. The key condition was the change in the drilling segments of directional wells from ascending to descending when drilling a horizontal section with a wave profile, as a result of which there is a multiple load drop on the deflecting blades. Based on the calculated data, with an increase in the axial load, it is recommended to adjust the drilling mode to reduce the risk of failure of the push-the-bit rotary steerable system.
Liquidation of the exploration pit n. 11 from the Rozna uranium deposit, Czech Republic
Authors: Vokurka M. , Molinek O.
Published: April 2021

The aim of this article is to introduce the history, characteristics and liquidation of one of the first exploratory borings of the Rozna deposit in the middle of Czech Republic. Based on available characteristics of the main mine workings and the local geology a design of liquidation was created to fulfill the legislative framework of Czech Republic as well as possible. The design was then executed by backfill with unconsolidated rock material and subsequently by securing the surface pit mouth of the main mine workings by closing sinking platform placed on micropiles. The finishing works included modifying the surroundings of the exploration pit by land machinery and smoothing the previous mining activity down, so that it doesn’t disturb the local morphology.
Improving the control system of concentration plants based on express control of dissemination of magnetic minerals
Authors: Chumakov A. , Prischepov V. , Melekhina K. , Ivannikov A.
Published: April 2021

One of the most important issues of the process control system is the quality control of the ore charge by averaging it over the material composition, which will improve the quality and quantity of the processing plant due to the stabilization of the properties of the raw materials. However, there are no methods for express control of the size of grains of productive minerals, which affect the extraction rates. Obtaining operational information on dissemination will increase the control of the technological process of ore preparation due to the operational control of the grinding process. Obtaining operational disseminated information can be achieved by measuring the electrical and magnetic properties of the ore. This article is devoted to express control of dissemination of magnetic minerals based on a comprehensive measurement of the magnetic characteristics of the ore flow. As the research part of the study was conducted within a training period, some remarks concerning educational value of joined research program are expressed in final remarks.
A rational approach to the management of underground mining in complex hydrogeological and geomechanical conditions based on a risk assessment
Authors: Krasyukova E. , Aynbinder I. , Ivannikov A.
Published: April 2021

The problems that arise during the combined development of vertical and subvertical ore bodies under complex hydrogeological and geomechanical conditions are considered, and their influence on the safety of mining operations is analyzed. In the course of the research, using the example of kimberlite deposits in Yakutia, new mechanisms were identified and spatial patterns were established for the development of processes of deformation, displacement and destruction of ore and rock masses during preparatory excavations and treatment works near surface and underground water bodies, including high-pressure ones. The mechanisms of complex accounting of the structural state of the massif, preliminary technogenic impact, the effect of complicating mining and geological and hydrogeological factors in substantiating the parameters of hazardous zones and barrier pillars are proposed. Risk assessment method based on hazard identification, a qualitative and quantitative analysis of the likelihood of an emergency considering the severity of the consequences when conducting mining in hazardous areas is presented. The application of the method in combination with the timely adjustment of technological processes provides a rational integrated use of geo-resources in the framework of sustainable development of mining system. The experience of training young personnel for scientific research institutes is described. Starting with university education and ending with their participation in real design work.
Preventive measures to minimize natural hazards in the Polish underground mining industry
Authors: Trzop K. , Palka D. , Szurgacz D. , Sobik L.
Published: April 2021

The process of underground hard coal mining and various types of natural hazards are inextricably bound up with each other. The occurrence depends on the response of the rock mass to the disturbance of its balance caused by mining activity determines the occurrence of natural hazards that can lead to a series of events that significantly disturb the safety and efficiency of the entire coal production process. Consequently, there is a constant search for methods that would support the available preventive measures. There are several solutions that can be applied during the mining process designed to either limit the frequency of hazards and/or limit their consequences. The paper reviews the current natural hazards in underground mining with particular emphasis on their consequences. Based on the experience of the authors and the review of papers that deal with natural hazards, possible solutions were analysed to reduce the potential for events associated with these hazards and their consequences. The research team focused mainly on preventive measures. The protection of human health and life was a key priority. It is also important to ensure continuity of exploitation and its economic efficiency, and to reduce the negative impact on the environment, the operation, working conditions, and mining costs. The analysis of the existing hazards and the possible ways of limiting their negative effects should improve work safety and the efficiency of the entire mining industry.
Stope stability assessment by the Mathews–Potvin method: a case-study of open stoping in salt rock mass under conditions of secondary stress field
Authors: Khazhyylai Ch. V. , Kosyreva M. A. , Eremenko V. A. , Umarov A. R.
Published: April 2021

Predicting the stability of open stopes is a challenging task for underground mine engineers. The introductory part of this paper presents main issues related to stability and safety of soil and rock mass in course of large earthworks and underground works. On the basis of former studies, this paper reviews the research findings on stope stability by the methods of Mathews and Potvin in the stoping design for rock salt mines operating at depths greater than 1 km under conditions of secondary stress fields, as well as the rock mass quality assessment by Barton’s method. The conservative stope design has been performed for a few scenarios of design parameters. In conclusions, it is underlined by the stability graph at the given parameters, that in the first case-study scenario, HR is 4.5 m and the Mathews–Potvin stability number is 68 m. It is concluded that the stopes will be stable and preserve their shapes. On the basis of presented case study (stope stability assessment in the test halite–polyhalite–polymineral salt deposit was carried out for a few scenarios at maximal effective stresses and under conditions of jointing), the authors provide the general provisions on salt rock mass assessment at great depths.
Underground hard-coal mine as a hosting facility for a data processing center infrastructure
Authors: Varnavskiy K. , Nepsha F. , Kostomarov R. , Chen Q. G.
Published: April 2021

The paper discusses the possibility of using the coal mines infrastructure for hosting the data processing centers (DPCs). Modern technologies allow to consider the power supply system of a coal mine being sufficient to fulfill the high requirements of power supply reliability for DPCs. For this aim, the authors proposed the ”coal - energy resources - information” concept with respective structure of energy supply. As a means of increasing energy efficiency, it is proposed to use cogeneration and trigeneration on coal mine methane which allows to provide power supply to power consumers, heat supply to a coal mine and cold supply to a data center. The technical risks associated with the use of DPCs and trigeneration in coal mines were identified, providing basis for future research. In the conclusion, it was noted that the development of DPCs integrally with coal mines can increase economic efficiency, as well as create new workplaces and become a driver for the development of the IT industry in mining towns.
Method for determining the traction force of the ground cable car drive
Authors: Chezganova D. V. , Muradov I.V. , Zhaglovskaya A. V.
Published: April 2021

The article is devoted to the problem of determining the necessary indicators of the traction force of the ground cable car drive, in the modes of start - up, steady motion and braking when operating them in curved workings with a variable path profile. Therefore, for each case of using a cable car in the mine, the required amount of traction must be calculated based on the specific values of the cable car profile parameters and the curvature of the path in the horizontal plane. The method of determining the traction force given below allows you to calculate the required traction force based on the design data of the ground cable car for specific operating conditions. To calculate the traction force, all the resistances to the movement of the composition of the trolleys and the traction rope are determined.
An overview of torque meters and new devices development for condition monitoring of mining machines
Authors: Zietek B. , Krot P. , Borkowski P.
Published: April 2021

Condition monitoring and diagnostics of minerals mining machines is a challenging task for operating companies and their maintenance staff. Conventional approaches based on measurements of vibration, temperature and other parameters are still not widely implemented in the mining industry due to non-stationary loading conditions. Registration of overloading and resonance modes is not sufficient by the electrical motors current in case of heavy mobile vehicles or stationary mounted mining machines having multi-body structure. Telemetric torque measurement tools installed in the drivetrains of mining machines allow accounting the variation of loads and gives valuable information on damages in geared transmissions. This paper represents the different methods of torque measurement and digital telemetry device under development based on strain gauges. The focus is on the functionality required for industrial applicability and issues in course of machines operation and maintenance. The additional features, which the torque meters afford for mining machines diagnostics, are considered.
Analysis of ammonium and phosphates concentration time series in river water
Authors: Drozdov I. Yu. , Aleksakhin A. V. , Aleksakhina Yu.V. , Petrusevich D. A.
Published: April 2021

The Ammonium prediction in river water and the Phosphate prediction in river water datasets (provided by the Ukrainian government) have been handled. The ARIMA (p, d, q) model of low order (p<5 and q<5) and high-order models (p>4 or q>4) have been constructed to describe behaviour of concentration time series at different river stations. Orders and coefficients in the first case are obtained via information criteria minimization. In the second case the ACF and PACF functions analysis is used. The ArDL(p, q) models are used to investigate correlation between concentrations of ammonium and phosphates at different river stations. Dependence of these parameters at the target water station and at other stations is confirmed with statistical tests. Conclusions about water pollution are made.
Methodology for calculate bearing capacity of soft soils under cyclic loading
Authors: Lazcano D. R. Panique , Aires R.Galindo , Maraón C. Olalla
Published: April 2021

The bearing capacity in soft soils under cyclic loading has not been widely studied as the static bearing capacity. In soft saturated soils under cyclic load, the phenomenon of cyclic softening occurs, this consists of an increase in the generation of pore-water pressure due to the cyclic load and a decrease in effective soil stresses. The purpose of this work was to propose a methodology for calculating the bearing capacity in soft soils under cyclic loading. The research is based on the results of monotonic and cyclic simple shear tests carried out with samples from the PRAT port of Barcelona. From an analysis carried out on all the experimental data, an equation for the generation of pore-water pressure is proposed. This formulation was implemented in the FLAC2D finite difference software and is part of the methodology. The methodology of the proposed calculation process consists of 6 stages and verification under two criteria. This process is iterative in case of not meeting any of the two verification criteria. Under this methodology of the calculation process, charts are proposed to calculate the bearing capacity of soft soils under cyclic loading. This application takes into account the properties of the soil, the static bearing capacity (P he), and the effective load outside the foundation (q). Also, an analysis of the parameters that most influence the bearing capacity of soft soils under cyclic loading was carried out.
Mathematical models of water pollution evaluation
Authors: Drozdov I. Yu. , Aleksakhin A. V. , Aleksakhina Yu.V. , Petrusevich D. A.
Published: April 2021

BOD (Biological Oxygen Demand or Biochemical Oxygen Demand) is the amount of dissolved oxygen, expressed e.g. in milligrams of oxygen per dm3 of water, consumed by micro-organisms to decompose the organic matter present in water. Ammonium and phosphate contamination prediction in river water and BOD in river water prediction datasets (provided by the Ukrainian government) have been handled. The paper presents proposal of linear regression models (configured with the Ordinary Least Squares (OLS) method) describing dependencies between the target water station and the test station values. The mutual influence between amounts of ammonium and phosphates in river water has been shown The ArDL(p, q) models were used to investigate correlation between concentrations of phosphates and value of BOD at the target river station. Influence of phosphates amount on the BOD in river water has been proven with statistical tests.
Remote sensing monitoring of influence of underground mining in the area of the S3 Express Road
Authors: Bugajska N. J. , Milczarek W. J.
Published: April 2021

Land subsidence is strongly associated with the activities of underground mines. Direct influence of exploitation lead to the formation of subsidence troughs, which are a common phenomenon in the Legnica-Glogow Copper Belt, in southwest Poland, where copper ore is currently intensively mined. As a result, the process of creating troughs may cause significant deformations in the surrounding urban infrastructure, including highways, bridges and railways. Satellite radar interferometry (InSAR), as a remote sensing method, appears to be a useful tool for detecting this type of extensive terrain surface change. Aim of this research was to detect the occurrence of displacements of the S3 Express Road section between the Glogow West Node and the Glogow South Node. For this purpose 29 images provided by European Space Agency (ESA) over descending orbit 22 was obtained from the Sentinel-1A satellite for the period from May 14, 2019 to April 26, 2020. Open source softwares has been used – GMTSAR to generate differential interferograms using the Persistent Scatterer Interferometry (PSI) method and Stanford Method for Persistent Scatterers (StaMPS) to process Persistent Scatterers (PS). The express road, as an anthropogenic object, is characterized by relatively high radar backscatter, thanks to which subsidence of the area are clearly noticeable and indicate the trend of long-term deformations.
Analysis of the vegetation condition on the area of the closed Babina mine in 1989-2019 using multispectral satellite images
Authors: Buczyńska A. , Blachowski J.
Published: April 2021

Technical and biological treatments, aiming at granting or restoring use/natural values of lands degraded by mining operations, are carried out already at the stage of mining works and continue after the end of exploitation. As a result of these activities, area of plant cover increases and condition of vegetation in the former mineral extraction is improved. However, monitoring of post-mining areas in various regions of the world indicates that in the sites of former exploitation local degradation of vegetation may occur, despite the completion of the reclamation process. Adverse changes in flora can be caused for example by water penetrating deep into the ground through the system of underground pavements or their collapsing. The purpose of this publication is to present the changes in the condition of plant cover within the Pustkôw mining field, one of the four fields of the closed lignite “Friendship of Nations - Babina Shaft” mine. The analysis of variation in the state of the plant cover health was carried out for the period of 1989-2019 based on NDVI, EVI and GNDVI spectral indices, developed using multispectral images of the Landsat TM/ETM+/OLI missions. The obtained results provide information about systematic improvement of the flora condition in the analysed region and indicate an increase in green areas. In 1989-2019, overgrowing of the shorelines of anthropogenic lakes and heaps was observed, as well as reservoir with a decreasing surface area due to vegetation succession was identified. In 2016, local degradation of the plant cover was also observed in the north-western part of the Pustków field. The obtained results prove the necessity of continuous monitoring of the flora health in the area of the analysed mine, but also in other post-mining areas.
Comparison of 3D models of an object placed in two different media (air and water) created on the basis of photos obtained with a mobile phone camera
Authors: Kujawa P.
Published: April 2021

Photogrammetry is one of the contactless geodetic techniques that provide reliable information about objects and their surface properties. Traditional photogrammetric methods require specialized equipment, such as metric cameras, which are very expensive and difficult to access, and the processing of the data obtained from them requires a significant investment of time. An alternative to this solution are generally available non-metric cameras, which can replace professional photogrammetric devices. Currently, consumer-grade digital cameras are enjoying the increase of popularity among photogrammeters thanks to the interchangeable lenses, good image sensor quality and the ability to manually set all camera parameters. However, due to the high costs of purchasing and maintaining such equipment, mobile phone digital cameras are increasingly used, the parameters of which are beginning to match many professional digital SLRs. The newest smartphones are also waterproof, so they can have potential applications in underwater photogrammetry.

This article presents the possibilities of using mobile phone cameras in close-range photogrammetry and shows the beginning of research on the use of smartphones in underwater photogrammetry. Three-dimensional models of the gear wheel were made on the basis of photos obtained in two media: in the air and underwater. The two point clouds were then compared, obtaining an average distance difference of ±0,3 mm.
Live Recovery After Post Earthquake and Tsunami: Economic Review Case Studies of Earthquake and Tsunami in Japan and Indonesia
Authors: Kurniasari Z , Nieamah K F , Arum W F
Published: April 2021

Natural disaster is a natural event that often gives such impact on the living things populations. The purpose of this research is to determine whether the occurrence of earthquake and tsunami has the potential to cause economic loss, thus, mitigation measures can be taken as an effort to reduce these losses. The method used in this research is quantitative. The data used are primary data from questionnaires, and secondary data were gained from various literatures. Data analysis was performed using Microsoft Excel. Based on the data analysis that has been conducted, the results show that earthquake and tsunami have a relation to the economy. All respondents agreed that earthquake and tsunami caused disruption to the public facilities operation. All respondents also agreed that the detriment after the earthquake and tsunami had an effect on fulfillment of needs and economic activities. This answer affirms that the damage of various facilities and production resources caused the increasing of limited satisfaction tools and scarcity arises, then resulting in economic problems.
Achieving Sustainable and Resilient Tourism: Lessons Learned from Pandeglang Tourism Sector Recovery
Authors: Azhari D , Rosyidie A , Sagala S , Ramadhani A , Karistie J F
Published: April 2021

After the 2018 Sunda Strait Tsunami, the hospitality and tourism industry has been severely impacted. Based on the Indonesia 2010-2025 National Tourism Development Master Plan, one of the visions is sustainable tourism. Sustainable tourism is expected to support the recovery from the tsunami impact on the hospitality industry, improving the current approach and enhance resilience of the tourism area. However, the research question is related tohow optimal has the relationship between the main components of sustainable tourism (ecology, socio-economy, and socio-culture) in Pandeglang? Therefore, this study aims to create the sustainable tourism strategy to fill the gaps on the 2018 tsunami recovery and the COVID-19 pandemic on the tourism sector and hospitality industry policy in Pandeglang. The study uses the qualitative method to describe the main strategy for sustainable tourism based on in-depth interview and secondary data. The findings indicated that the relationship between the main components of sustainable tourism which are ecology, socio-economy, and socio-culture have not been integrated optimally in Pandeglang. Sustainable tourism can provide the preservation and conservation of the sanctity of tourism in Indonesia, especially Pandeglang.
Critical Success Factors (CSFs) on Virtual Hotel Operators in Bandung City
Authors: Ervina E , Indra D , Taufiq R
Published: April 2021

The advancement of Information and Communication Technology (ICT) has encouraged the beginning of a new form of hospitality business known as a Virtual Hotel Operator (VHO). This hotel concept in recent years succeeded in attracting hotel management and cooperation from various accommodation entrepreneurs. VHO concept is considered a disruption that threatens the existing hotels. Some of the big VHO brands in Bandung include RedDoorz and Oyo. The presence of VHO might be one of the reasons for the decrease in the occupancy rate of star hotels. The other hand, the occupancy of non-star hotels continues to increase. It becomes urgent to understand the Critical Success Factors (CSFs) of the VHO. This study aims to identify the determinants of the success of VHO hotels in Bandung. This research is an exploratory study using primary data through surveys, and secondary data that focuses on hotel guests who have stayed through VHO in Bandung City CSFs are measured using questionnaire using the Likert scale of 5 and processed using SPSS 25. The findings of this study indicate that the choose VHOs is inspired by the variety of promotions offered, ease of access, and extensive hotel networks. Furthermore, the factors that support the success of VHO are components of service quality, core products and control strategies. The ease of booking a room and broadness of the network are keys in increasing VHO sales.
Knowledge Management Systems Development and Implementation: A systematic Literature Review
Authors: Riswanto  , Sensuse D I
Published: April 2021

Knowledge management systems can help to automate KM processes that exist in organizations. These systems facilitate knowledge discovery, knowledge capture, knowledge sharing, and applying knowledge in an organization. Using appropriate methods to develop and implementing knowledge management systems help organizations realizing these systems more effectively to enhance an organization’s competitive advantage and facilitate KM processes. This study investigates the approach for developing knowledge management systems in organizations with a systematic literature review in the past ten years. The findings in the literature study show that seventeen methods are used in the development of KMS, where the SECI knowledge spiral is the most often method used for developing KMS by combining it with traditional IS development techniques. In this study, we also compare five methods as candidates for KMS development methods that can support the acceleration of the innovation process in organizations and evaluate them based on KM criteria that support innovation using the analytic hierarchy process technique. It is found that Fernandez’s methodology combines with Joint Application Design (JAD) adoption is the most prominent method used in building a knowledge management system to support the innovation process in an organization and web 2.0 as the most technology applied to support organizational KM implementation.
Destination Attachment and Risk Perception to Determine the Behavior of Volunteer Tourists as Sustainable Development Agents: A Conceptual Model
Authors: Pangaribuan C H , Manurung A H , Saroso H , Rusmanto T
Published: April 2021

Tourism rests on the natural beauty and uniqueness of a tourist destination, both the environment and the people’s socio-culture, hence maintaining sustainability towards a better future. The development of volunteer tourism does not rely solely on tourists’ behavior. Nevertheless, it also depends on the uncertainties and consequences as well as emotional connection of what the destination has to offer. So far, the scholars have done little empirical study on this area. Thus, this study tries to undertake a conceptual research on measuring volunteer tourists’ behavior by understanding the relationship between the norm activation model and destination attachment and risk perception roles. Therefore, a study on the inclusivity of tourists’ attachment to a particular place and perceived risks in volunteer tourism is an essential need to sustain the tourism industry. Constructs affecting the behavior of volunteer tourists are discussed and relevant propositions are made. Managerial implications are suggested, and future research directions are also identified.
A Social Media Mining Using Topic Modeling and Sentiment Analysis on Tourism in Malaysia During Covid19
Authors: Deraman N A , Buja A G , Samah K A F A , Jono M N H H , Isa M A M , Saad S
Published: April 2021

Malaysia’s tourism is affected by the Covid19 pandemic and the MCO implementation, where borders are closed and non-essential activities are halted. Negative effects are also felt by Malaysians and are reflected in social media. This study examines two research questions, finding the issues that Twitter users have been addressing on tourism activities during the MCO period and analyze users’ sentiment regarding their ability to travel after MCO. 5000 data were extracted manually from 11357 data scraped from Twitter, of which 3243 were pre-processed keywords using RapidMiner. The results show that the topic of the debate focuses on three themes, namely the destination of tourism, future planning, and public emotions. In addition, 63% gave a positive view and 22% negative sentiment on domestic tourism. Overall, users of Twitter gave an optimistic outlook on domestic travel and hoped that Covid19 would soon be over.