bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Effect of Ash-Slag Ratio on Mechanical Properties of Magnesium Slag Cementitious Material
Authors: Liu Qi , Ma Jianxun , Zheng Weiwei
Published: December 2019

Magnesium slag is a kind of industrial waste slag with silicate mineral as the main component when smelting magnesium metal. Its main component is similar to Portland cement clinker and can be used as cementitious material. In this paper, the mechanical properties of magnesia slag cementitious materials under different ash-slag ratios are studied and analysed. Magnesium slag and fly ash are prepared by composite method. The flexural and compressive tests are carried out. The effects of different ash-slag ratios on the mechanical properties of magnesia slag cementitious materials are studied. The experimental data are analysed and theoretical studies are carried out, and the conclusion is drawn on: (1) When the ash-slag ratio is between 0.43 and 0.8, the forming effect of Mg-slag cementitious material specimen is better; (2) When the ash-slag ratio changes from large to small, the properties of Mg-slag cementitious material will change greatly, from curable to powdered after curing, unable to form, and the critical value of the ash-slag ratio is between 0.25 and 0.43; (3) When the ash-slag ratio is in the range of 0.43-1.2, the mechanical strength of magnesium slag cementitious material is higher, the maximum flexural strength can reach 10 MPa, and the maximum compressive strength can reach 50 MPa.
Evaluation and Application of New Anti-expansion Unblocking Agent for Water-sensitive Oil Deposit
Authors: Wei Lili , Xie Juan , Yu Jiliang , Cai Shaosong , Zhang Wei , Yan Haijun , Ma Zhi , Su Na , Gao MengXiang , Liu Shasha , Qin Zhonghai
Published: December 2019

In water-injection development, water-sensitive oil deposits are prone to water injection pressure increase and water injection volume decrease, which makes it difficult to complete production and injection allocation. To solve this problem, on the basis of screening traditional anti-expansion unblocking agents, and combined with the performance evaluation of the formula and core experiment, a reasonable improvement scheme was proposed in this paper to develop a new type water-sensitive oil reservoir anti-expansion unblocking agent. The performance evaluation experiment shows that it has an applicable dissolution rate for oil rock samples and can dissolve inorganic salt scale; the anti-expansion rate is up to 90%; the core dynamic evaluation experiment shows that the core permeability can be increased more than double after the injection of the anti-expansion unblocking agent. The new type water-sensitive anti-expansion unblocking agent were used in 7 wells of the site, and all of them have a good effect of water injection pressure decrease and water injection volume increase.
Study on the dosage of temporary plugging Agent for steering fracturing
Authors: Dong Bo , Pu Xiao , Deng Jiasheng , Li Lei
Published: December 2019

The Triassic Baikouquan Formation in the Junggar Basin has developed a large number of dense sandstore conglomerate reservoirs, which belong to ultra-low permeability and ultra-low permeability refractory reservoirs. In recent years, the productivity of single well is improved by selecting potential production wells for multi-stage steering fracturing. In order to realize the forced steering of fractures, it is very important to study the sealing pressure of temporary plugging agent. According to the actual needs of Baikouquan steering fracture, the net pressure model of steering fracture is established. The net pressure value in the seam is calculated according to the change of ground stress after steering, then calculated the minimum temporary plugging agent sealing pressure needed for a single fracture. Based on the net pressure model, the corresponding software is developed and applied to the field. The practical application effect is good, which provides economical and effective technical technical support for the continuous and stable production of low permeability oil field.
Development and Application of R pin insulator insulating rod with pincer
Authors: Jun Ma , Yonggang Shi , Gang Dong , Fuxing Gong , Kegang Wei , Xin Su , Yu Ding , Zhu Wang
Published: December 2019

In the field of live working of transmission lines, the R pin insulator has been put into application as an emerging type of insulator connection in recent years. In view of the difficulty in eliminating the prior art and tools, and affected by the working environment, this scheme has designed a kind of R pin insulator insulating rod with pincer. The design scheme consists of a hook body and connecting members, an insulating operating rod, etc., and does not change the operation method of the original insulating rod for the pincer, and the hook head is horizontally moved by the rotation of the nut to achieve the loading and taking of the R type limiting pin. The deductor has a simple structure, is simple and flexible to operate, and is convenient to carry. The process of taking off the sales is less difficult, greatly shortening the time, improving the efficiency of the work, and achieving the purpose of optimizing the operation process. And it has a broad market prospects.
Study on corruption bacteria in Beijing sausages
Authors: Gao Xiang , Han M M , Zhang X Y , Cai Z Y , Wang Fang , Pang M X , Qi J H
Published: December 2019

Low-temperature meat products are very popular, but due to the characteristics of processing technology, there are still some heat-resistant microorganism residues after sterilization, which lead to its extremely vulnerable to corruption and short shelf-life. The spoilage discipline and mechanisms of Beijing sausages were summarized on the basis of spoilage bacteria isolation, identification and analysis. The main results were as follows: by using method of 16S rDNA sequence analysis, the main spoilage bacteria which isolated and identified from Beijing sausages were Pseudomonas sp, Staphylococcus sp, and Brochothrix sp. By denaturing gradient gelelectrophoresis(PCR-DGGE) analysis, there were 13 kinds of the spoilage bacteria of Beijing sausages, and Pseudomonas sp was the main spoilage bacteria.
Study on enhancing heat transfer performance of spiral groove tube in phase change heat storage for solar energy
Authors: Jingzhi Jiang , Lin Bo , Zhengjia Chen , Shuyao Hu , Haiting Cui
Published: December 2019

Based on the energy storage problem for solar energy utilization and the advantages of spiral groove tube heat exchanger, spiral groove tubes were used in the solar energy phase change heat storage. The thermal storage process of heat reservoir was simulated numerically. Firstly, the simulation method and the reliability of the used model are verified experimentally with smooth tube. Using spiral groove tube as water flow pipe and phase change material as heat storage medium, The three-dimensional model of heat storage was built by Gambit software and the grids were divided by ICEM. The heat storage process in the spiral groove tube and smooth tube heat storage were numerically simulated and the heat transfer enhancing effect was investigated. The influence of structural parameters such as groove pitch and groove depth on the heat storage process is simulated numerically and the influence rules are analyzed. The results show that the convective heat transfer intensity and heat transfer capability are enhanced when the smooth tubes are substituted by spiral groove tubes in the phase change heat storage and the heat storage time becomes shorter. In the range of this paper, the optimal structural parameters of spiral groove tube is groove pitch p=7mm and groove depth e=0.4mm.
Performance test & analysis on fan coil unit and improved induction air unit system
Authors: Wang Zhiyi , Li Jingfan , Wang Dongming
Published: December 2019

Induction air unit was improved by decreasing the induction ratio and adding the rectifier. Performance test on fan coil unit and improved induction air unit system was carried in the model houses. Test results showed: (1) Induction air unit system could meet the temperature requirement of room. It had a strong dehumidifying ability and much uniformity air velocity in the range of comfortable. (2) Induction air unit system had little temperature gradient and difference. (3) The unit was energy efficient combined with the extensive air handling unit and medium temperature chiller. Improved induction air unit would be used in the high quality air conditioning spaces.
The determination of simultaneous use coefficient for load prediction of the tourism resorts
Authors: Guozhong Zheng , Yajing Wang
Published: December 2019

Load prediction of regional buildings is the basis of equipment capacity allocation of regional energy system. However, the equipment capacity of the energy system is usually too large and unnecessary energy consumption is wasted. It is very important to choose an effective load prediction method. In this paper, scenario analysis and software simulation methods are combined to simulate the cooling load and heating load of the tourism resorts, then the load and the simultaneous use coefficients of the tourist resorts under different building ratios are obtained. The proposed method is simple and effective, and it can provide reference values of simultaneous use coefficients for similar projects in the future.
Applying analysis of power quality enhancement by using UPQC
Authors: Xie Wei
Published: December 2019

The current power sector is dealing with the weak power quality issues and the main reasons hiding behind the weak power quality are harmonics, fluctuations of voltage, transients and reactive power consume. These problems are caused by arising trends in our consume. Nowadays, the share of supply from power electronic devices has greatly increased among our consume. Coupling of the grid to a symbiosis of wind farms and PV parks has also raised matter of weak power quality. There is no doubt that shunt and series compensation is efficient but if they are utilized as a single unit simultaneously, this will increase the efficiency of the device and become a greater beneficiary of the power sector, which together serve as UPQC (Unified Power Quality Conditioner). Therefore, to improve the power quality is the main task of UPQC and through compensation to the above problems proves that it has considerable advantages in improving power quality. So UPQC is considered to be an effective method to solve power quality problems. Since UPQC is used for both shunt and series compensators, it contains two inverters to provide this service. They are voltage source inverters with a common DC link, which are called shunt and series converters. These controllers can be controlled by various techniques such as PI controllers, Fuzzy controllers, Neural Networks etc. The series converter is in charge of the smoothing of the voltage, and the shunt converter compensates for the distorted load current.
Review and evaluation of the research status of science and technology innovation index
Authors: Chang Yan , Shi Yongpeng
Published: December 2019

At present, technological innovation has become the most important competitiveness of a country. Starting from the scientific and technological innovation index, this paper firstly reviews the research status and evaluation criteria of science and technology innovation index at multiple levels such as the national, regional, and enterprise levels. Then the practice of the current science and technology innovation index is systematically combed and studied. Finally, on the basis of literature review and status quo, this paper reviews the current research on sci-tech innovation index, and points out that selecting appropriate index system according to different stages of economic development and different levels of sci-tech development is the foundation of constructing sci-tech innovation index.
An Empirical Study on Party Basic-Organizational Construction and Organizational Outcomes in State Owned Enterprise–Take Psychological Empowerment as Moderators
Authors: Ni Hui-jun , Kang Mingju , Wang Xi
Published: December 2019

The paper discusses the impact of Party Party Construction and organizational outcomes. The survey from state owned enterprise shows that party basic-organizational construction can significantly affect organizational outcomes. This paper takes psychological empowerment as intermediary variables to study the relationship between party basic-organizational construction and organizational outcomes. The survey from State owned enterprise shows that Party basic-organizational construction can have significant predictive power on outcomes and psychological empowerment acts as a significant moderator. This research provides useful tools for organizational outcomes management through enterprise activities of party basic-organizational construction.
Correlation Analysis between party leading and Organizational Outcomes in Grid Enterprises–Take Organizational Learning as Moderators
Authors: Ni Hui-jun , Ye Fei , Li Jingwei
Published: December 2019

The paper discusses the impact of party construction and organizational outcomes. The survey from state owned enterprise shows that Party Construction can significantly affect organizational outcomes. This paper takes organizational learning as intermediary variables to study the relationship between state owned enterprise and organizational outcomes. The survey from state owned enterprise shows that party construction can have significant predictive power on outcomes and organizational learning acts as a significant moderator. This research provides useful tools for organizational outcomes management through the power of enterprise activities of party construction.
Evaluation Method of the Spatial-Temporal Complementary Characteristics Between Power Source and Load Based on Power Big Data
Authors: Zheng Kuan , Yan Xiaoqing , Li Yachun , Yang Jie
Published: December 2019

With the rapid development of the intermittent renewable energy power generations such as wind power and solar power and the new random load such as EV, the double randomness become a great threat the safe and stable operation of power system. It has become a hot issue raised increasingly concern from the academic and engineering fields that how to reduce the randomness and volatility of the two sides of the system by utilizing the spatial-temporal complementary characteristics of different energy resources and loads. In this paper, the evaluation model of complementary characteristics between power and load across time and space based on the Power Big Data theory is proposed. By simulating the complementarity of the power supply and load between Northwest China and European load centres from three dimensions: load-load complementarity, source-source complementarity and source-load complementarity, it proves there are great complementary benefit by interconnecting the grids with different regions across continents, which provides a theoretical basis for the next implementation of the Global Energy Interconnection.
Optimization of Process Technique of Rice Milk Drinks via Response Surface Methodology (RSM)
Authors: Lin Qian , Zhang HongYun , Li Jun , Zhu Danshi , Liu He
Published: December 2019

In this manuscript, the production process of rice drink was optimized by response surface analysis. The results showed the best process conditions for rice milk drinks as follow: ratio of material to liquid was 1:18, the amount of maltose added was 5.4% and the amount of non-dairy cream was 1.3%. The product was an ivory emulsion, which not only had a strong rice flavor and frankincense, but also had a delicate and smooth taste without condensation and stratification which provided new ideas and methods for the intensive processing of glutinous rice.
Research on Interaction and Coordination Control Technology of Wind Power and DC System of Receiving Grid
Authors: Li Haifeng , Li Xiaojun , Chen Meng , Jin Tao , Tang Xiaojun , Huo Qidi
Published: December 2019

In this paper, an in-depth study on the interaction characteristics and coordinated control technologies of wind power and DC systems is carried out. This paper first defines the physical significance of the interaction between wind power and DC in the receiving grid. At the same time, an interaction factor that takes into account the strength of the wind and DC relative AC system and the relative impedance between them is established. Then the factors affecting the interaction between wind power and DC system are analyzed. Finally, the coordinated control strategy between the them is discussed. The North China Power Grid, which is connected by offshore wind power and Xitai DC, is used as an example. The results show that the smaller the electrical distance between wind power and DC system, the larger the scale of the two systems and the more obvious interaction between them.
Wind power grid-connected frequency regulation strategy based on ESO control and PI control
Authors: Xu Maoda , Yang Hui , Hao Wenbo , Zhao Xiaoyang , Yu Siyao
Published: December 2019

Frequency fluctuation of wind power grid-connected system is difficult to adjust, aiming at this problem, this paper proposed a control strategy based on the combination of inner loop control and outer loop to restrain frequency fluctuation. extended state observer (ESO) is used as the outer loop. The error and disturbance which cannot be reflected directly in the system structure are estimated by linearization. The inner loop PI controller is designed through the parameters of proportional link and integral link to realize the reasonable allocation of internal model poles and achieve better damping effect. Simulation show that the control strategy can effectively suppress the system frequency fluctuation caused by load fluctuation and maintain frequency stable. The research results can be used to guide engineering practice.
Simulation of an improved PID algorithm and its application in thermal conductivity measuring apparatus
Authors: Wang Jun , Wei Yongbin , Chen Wenjie
Published: December 2019

The working principle of an improved PID algorithm and its application in thermal conductivity measuring apparatus is presented in this work. A special simulation application software was developed for parameter tuning and optimizing. The simulation result was used in the thermal conductivity measuring apparatus which is designed under the principle of guarded hot plate. Therefore, the testing process time required for the thermal conductivity of building thermal insulation material was cut by one-third, from one hour to twenty minutes.
Accurate Positioning in Extraordinary Circumstances
Authors: Li Qi
Published: December 2019

This paper mainly introduces the indoor and underground closed space, When the GPS can not meet the user’s requirements for positioning accuracy, the new positioning technology is adopted. SLAM positioning for indoor positioning, and some basic component information used in this technology is at the present stage; In addition, the UWB ultra wideband technology used in underground space and some commonly used algorithm models of the technology are presented.
Research on the development of photovoltaic informatization based on ubiquitous power Internet of things
Authors: Fan-teng Meng , Xiang-ying Xie , Zhi-xiong NA , Da-yan MA , Wen-tao Shen
Published: December 2019

The Internet of things integrates traditional technologies with communication, information, sensing and other technologies to achieve comprehensive perception, intelligent processing, reliable transmission of traditional physical facilities. Photovoltaic power application market has developed over a decade, with a continuously expanding installed scale and the conditions of grid parity have been provided preliminarily. In this paper, photovoltaic distribution is proposed to replace large centralized ground power stations in the future and become the main force of photovoltaic power generation. In addition, intelligent photovoltaic Internet of things (iot) system with comprehensive perception, cloud-side collaboration and whole-process data sharing and integration is designed.
A new type of high density fracturing fluid system
Authors: Gao Yuebin , Cai Bo , Qiu Jinping , He Chunming , Duan Guifu , Li Shuai , Xu Zhihe
Published: December 2019

Deep oil and gas reservoirs enjoy great opulence in resources, and yet the ultra-deep burial, high temperature, high pressure and natural fractures in reservoirs bring great difficulties to propped fracturing. Given the challenge of propped fracturing in deep reservoirs, a new cost saving and high density fracturing fluid system was developed, of which the performance was evaluated and formulation was optimized, and with this fracturing fluid system, wells that cannot be treated before, can now be effectively stimulated. The advanced fracturing fluid system has been applied to eight layers in five wells, which all proved to be successful and effective, with remarkable reservoir stimulation efficacy. The post-production in the formation testing grew twice of the pre-fracturing production, and two wells were seen gas production exceeding one million cubic meters. The advanced fracturing fluid system greatly expands the well depth range of exploration and development, and lays a solid technical foundation for implementation of propped fracturing in deep reservoirs.
Test of flow characteristics and parameter optimization of steam turbine DEH
Authors: Zhizheng Du , Yan Zhang , Baoying Zhu
Published: December 2019

The characteristics of steam turbine high pressure cylinder intake valve directly affect the performance of AGC and primary frequency modulation, In DEH system, the nonlinear characteristics of the high valve flow need to be corrected to ensure a smooth and linear relationship between the integrated valve level instruction and the steam flow of the turbine. When the nonlinear correction of the high valve flow is not correct, there may be nonlinear intervals such as “dead zone”, “jump”, and “inflection point” between the valve comprehensive opening instruction and the steam turbine flow, The valve integrated opening command mutates the gain of steam turbine flow, causing the valve to be insensitive or oscillating when the valve is in a certain opening range under the coordinated control system of the furnace and machine.
The shunt capacitor placement based on partition method in middle level distribution networks
Authors: Lunzhu Dawa , Kui Tao , Dunzhu Basang , Ping Ni , Zhihua Dong , Zhiyuan Pan
Published: December 2019

The capacitor placement based on rational reactive power partition can reduce the power loss and increase benefits in middle distribution systems. So this paper proposes a new capacitor placement method based on reactive power partition. First the distribution is partitioned by Depth First Search algorithm and the principle that the reactive power of each partition load is the most similar. Then the number of node is also more similar in each partition. This is helpful for the selection of locations. Secondly the locations and capacity are simultaneously optimized after partition and obtain more benefits. Finally the 94 node distribution system proves the advantage and practicality of the proposed algorithm.
Research on the Progress Supervision Technology of Electricity Grid Construction Projects Based on Multi-service Collaboration
Authors: Zhang Jian , Yang Junyi , Gao Qian , Liu Kai , Jin Cheng , Huang He , Wang Jing , Tang Jie , Xu Shijie
Published: December 2019

With the continuous deepening of external supervision and internal lean management, the quality requirements for investment statistics of power grid enterprises are increasing. However, the scale of investment and the number in power grid projects are large. The traditional management mode is not only heavy workload but also low accuracy. Therefore, it is necessary to strengthen the supervision of the progress of electricity grid construction projects through the coordination of multi-business departments, and check the quality of investment statistics, so as to find suspected problem items in time, to batch positioning the causes of deviation and to improve the lean management level of electricity grid construction projects.
Optimization Study on Direct-expansion Evaporative Condensation Air-conditioning System
Authors: Yu Wenhong , Wang Haoyu , Zhang YiXiang
Published: December 2019

This paper introduces the working principle and characteristics of the direct-expansion evaporative condensation air-conditioning system, and analyzes the main factors affecting the cooling efficiency of a building’s direct-expansion evaporative condensation air-conditioning system. Based on the conclusion, this paper optimizes the operation strategy and reduces the system energy consumption and provide reference for the design, control and operation of this system in the future.
Research on Risk Management of Prefabricated Construction Supply Chain Based on Immune Principle
Authors: Yingchao Wang
Published: December 2019

The structure of the prefabricated construction supply chain is becoming more and more complex, and the related risks of the prefabricated construction supply chain are becoming more and more prominent. Therefore, it is necessary to strengthen the supply chain risk management of the prefabricated construction enterprise. Firstly, starting from the concept and mechanism of biological immunization, combined with the risk analysis of the prefabricated construction supply chain, the similarity between the risk management of the prefabricated construction supply chain and the biological immune system is discussed, and a risk management model based on the immune principle is established. Further, the corresponding recommendations for risk prevention of prefabricated construction node enterprises are also proposed, which provides new ideas for enterprise risk management activities.
Multi-dimensional Evaluation and Analysis of Wind Power Investment Development Format under Supply Side Reform
Authors: Liu Xiaomin , Ding Xiangyang , You Fei , Wang Zheng , Huang Kai
Published: December 2019

Through reviewing relevant literatures, this paper summarizes and analyzes the existing research results of wind power development level, and constructs a reasonable, scientific and comprehensive comprehensive evaluation index system for wind power development level, and compares the development level of wind power in recent years. In this paper, the research environment of supply-side reform is aimed at the development status and influence mechanism of wind power industry. Based on the logistic model and learning curve analysis of wind power industry development, this paper studies the evolution of wind power industry and the evaluation system of wind power investment development in China under the supply-side reform background. Empirical analysis, calculate and characterize various indicators of wind power industry from multiple angles, and improve the comprehensive evaluation and analysis of wind power investment development forms. The full text shows that wind energy is a renewable, non-polluting, low-energy, and promising energy source. It is a strategic choice for countries around the world to vigorously develop clean energy such as wind energy.
Assessment of atmospheric correction results by iCOR for MSI and OLI data on TSS concentration
Authors: Nurgiantoro  , Muliddin  , Kurniadin N , Putra A Y S I , Azharuddin M , Hasan J , Hardianto  , Langumadi M I Y
Published: December 2019

Atmospheric correction is very important process to determine of land and ocean surface properties measured from satellite data, especially optical remote sensing satellite system, because passive satellite instruments will always be contaminated by the influence of the atmosphere. The result of this processing is the surface reflectance (sr) product, and it is a necessary process when quantitatively monitoring environmental quality parameters from space. The goal of this study is to assessing of the spectral remote sensing reflectance satellite (Rrs
(λ) by the image correction for atmospheric effects (iCOR) tools on total suspended solid (TSS) concentration from the MultiSpectral Instrument (MSI) sensor on-board Sentinel-2 and the Operational Land Imager (OLI) sensor on-board Landsat-8. Involvement of 25 in-situ TSS stations in Kendari bay waters is to assess the results of iCOR-S2 and iCOR-L8. An assessment of the sr results reduced to Rrs
(λ) on the MSI and OLI data respectively, affected the value of R
2 where the highest value R
2 = 0.665 is shown on red band OLI data. Meanwhile, the assessment of three TSS algorithms models is built on Rrs
(λ), all of them showed mean relative error (MRE) < 30% and were considered capable of defining TSS concentrations in the study area.
Analysis of the green light penetration from Airborne LiDAR Bathymetry in Shallow Water Area
Authors: Pratomo D G , Khomsin  , Putranto B F E
Published: December 2019

An Airborne LiDAR can be used to map the depth of the water. This system is called an Airborne LiDAR Bathymetry. In order to measure the water depth, an Airborne LiDAR is utilized with the green light sensor beside the near-infrared light sensor. However, water condition affects the capability of the green light penetration. The clarity of the water and the vegetation are some of the restriction for green light to penetrate the water especially in inland water areas. The research examined the penetration capability of the green light of the Airborne LiDAR Bathymetry in shallow water areas. A comparison of depth values derived from the LiDAR system and the direct measurements was performed to asses the penetration accuracy of the green light. The depth comparison is derived from eleven channels in the research area. The direct measurement was conducted by using a tape to measure the depth, and the RTK GNSS to measure channel’s dimension. A Secchi Disk also used to measure the turbidity of the water. The vertical reference for the depth is Earth Gravitational Model 2008 (EGM 2008). Based on the research, the depth difference between LiDAR Bathymetry and the direct measurement ranges from 0.02 m to 0.22 m. The vertical accuracy of the LiDAR Bathymetry is 0.239 m within 95% of confidence level.
Bathymetric mapping of shallow water using Landsat 8 and Sentinel 2A Satellite Data. Case Study: East Madura’s Waters
Authors: Jaelani L M , Bobsaid M W , Khomsin
Published: December 2019

Bathymetric mapping was used to map the sea floor. The accurate and recent sea floor data are needed by many human activities such as for water transportation routes and off-shore infrastructure constructions. General in-situ mapping using multi/single beam echo-sounder is time consuming, high cost and difficult access to a remote area. Bathymetric mapping on shallow water near coastal area also facing a challenge when the in-situ mapping is difficult to be performed for the reason of the access of survey-ship. In this research, we proposed a new technique to map the shallow sea floor (less than 80 m of depth) using optical remote sensing satellite data by exploiting the Landsat 8 and Sentinel 2A imageries. The bathymetric data estimated from these satellites then validated with in-situ measurement data collected in April and October, 2015. The range of absolute depth was 8.724 – 12.056 meter for Landsat 8 and 9.220 -11.149 meter for Sentinel 2. A promising result was obtained for Landsat 8 data with NMAE of 21.288% and wider range of estimated depth compared with obtained depth by Sentinel 2. Both samples point of remote sensing images failed to deal with water depth shallower than 8 m and deeper than 13 meters.
Identification of potential drought in Lamongan Regency
Authors: Hariyanto T , Pribadi C B , Purwitasari A , Kurniawan A
Published: December 2019

Drought will affect almost every aspect of human life. The impact of drought hazards is often slow but certain, so that if not monitored continuously it will result in the loss of food due to crops and dead livestock, farmers losing their livelihoods and others. Lamongan regency is one of districts with drought level in very high risk class. At IRBI BNPB in 2011, Lamongan Regency is 2nd ranked of all regencies in Indonesia. By interpreting remote sensing data we will be obtained parameters such as ground surface temperature, vegetation density with EVI transformation, wetness index, brightness index, and land use. These parameters and accompanied by secondary data which is rainfall can be used to identify the drought potential in Lamongan because each parameter has properties that can be associated with its vulnerability to drought potential. Performed by weighting technique and overlay process on these parameters can produce the identified areas with very high drought potential which is 14.171 hectares or 0.009% of total area and dominated in Paciran Sub-District. And the identified areas with very low drought potential which is 20979.626 hectares with a percentage 13.222% of total area and dominated in Karangbinangun Sub-District, Kalitengah Sub-District, Turi Sub-District and Deket Sub-District.
Spatial analysis of urban growth based on city center and central business district (a case study of Antananarivo, the capital city of Madagascar)
Authors: Fetraniaina A , Deliar A , Harto A B
Published: December 2019

The use of historical and present spatial data in urban growth analysis has been considered as a fundamental prerequisite in urban geographical studies, future planning and implementation of city development policies. In the current study, a comparative analysis of urban growth based on city center and central business district (CBD) of Antananarivo, the capital city of Madagascar was carried out. Four temporal satellite images of 5 years interval were used to determine the pattern, the process and general conditions of expansion of the urban extents in different directions. Pearson’s chi-square test and Shannon’s entropy measure were used to evaluate the degree-of-freedom and degree of sprawl towards the analysis of urban growth. To combine the previously mentioned statistics, the degree of goodness was used. The comparative analysis shows that there are contradictive results in the derived statistical measures from both considered urban growth centers indicating different conditions of urban growth. Deeper analysis accompanied by the theory of Von Thünen on urban land use support that the CBD is the most appropriate center of growth for the application of the previously mentioned statistical measures for the case of Antananarivo city.
Study of potentials economic valuation of mangrove ecosystem for coastal communities using satellite imagery (case study: East Coastal Surabaya)
Authors: Sukojo Bangun Muljo , Arindi Yurike Nisa
Published: December 2019

East Coastal Surabaya is one of the places planted with mangrove ecosystems. Given the important role of mangroves in human life, it is necessary to manage a good mangrove ecosystem. Mangrove at East Coastal Surabaya is one of the conservation areas which is in a good condition. From the results of the study, it was found that the correlation between NDVI and Nitrate, Phosphorus, Potassium, pH, Salinity showed a strong correlation of value (R) of 0.99, 0.99, 0.98, 0.98, 0.99. This shows that if the NDVI value is high, so does the NPK parameters of nutrients, pH, salinity. From an economic side, the mangrove ecosystem is expected to increase the economy of the people in the coastal areas. The estimated value of the mangrove uses economic value. The value is obtained from the total value of direct benefits, indirect benefits and the benefits of the choice of mangrove ecosystems. From the results of this research, the estimated value of the total mangrove economy is 19,157,539,347/year. The details consist of the annual direct value of mangrove benefits of Rp. 192,865,000, annual indirect benefits of Rp. 18,820,605,707 and annual preferred benefit value of Rp. 144,068,640.
Impact of Kigali City master plan implementation on living conditions of urban dwellers: case of Nyarugenge District in Rwanda
Authors: Nyiransabimana M J , Rwabudandi I , de Vries W T , Bizimana J P , Benineza G G
Published: December 2019

The increasing population and inadequate planning resulted in informal settlements and poor social infrastructures in Kigali City. As response, the Kigali City authority adopted the Kigali City Master Plan (KCMP) to guide the urban development. However, no evaluations of the KCMP implementation has been carried out. This study assessed therefore the level of KCMP implementation and its impact on living conditions of urban dwellers in Nyarugenge District. We evaluated the KCMP implementation using Geographical Information System (GIS) overlay analysis, based on indicators of degree of conformity: accordance, unfulfillment and deviation. We assessed the impact of KCMP implementation using a paired sample t-test analysis to compare the availability/accessibility of urban quality of life indicators before and after the adoption of the KCMP. The results indicated that the level of KCMP implementation is low due to zoning categories and construction standards that are not affordable for low-income citizens. Nevertheless, this implementation has partly improved dwellers’ living conditions through the provision of some elements of urban quality of life. The KCMP should be revised thereby considering the affordability of its implementation by different stakeholders including low-income populations. Further researches should assess negative impacts of KCMP implementation on living conditions of urban dwellers.
Satellite data use in the WEAP Model as an evaluation of Water Availability in Unda River Basin
Authors: Jayantari M W , Wardoyo W , Maulana M A
Published: December 2019

Unda river basin is one of the potential river basin in Bali Province of with a perennial river so that water availability is available every year. Even though it has a great potential, the river basin management is not optimal so that during the dry season there is still a lack of water. Water Evaluation and Planning (WEAP) is a model that can combine hydrological processes with management of water allocation in a catchment area. This model can evaluate the water availability in the Unda river basin. WEAP has a tool that is automatic delineation mode that can be used to automatically delineate catchment areas, land cover data and climate data based on satellite data which can make easier to modelling. The results of this study can be used as an evaluation in the water availability in the Unda River Basin so that the potential in the Unda River Basin can be optimal and sustainable.
Surface deformation and earthquake potential in Surabaya from GPS campaigns data
Authors: Anjasmara I M , Mauradhia A , Susilo
Published: December 2019

Study by the National Centre for Earthquake Studies suggests the presence of two segments of Kendeng active fault, namely Surabaya fault and Waru fault in Surabaya. This study aims to investigate the surface deformation and earthquake potential in Surabaya that possibly related to the activities of those two faults. We use GPS campaigns data conducted in March 2017, September 2017, May 2018, and October 2018 and five GGPS CORS stations around Surabaya provided by the Indonesian Geospatial Information Agency. In total, 21 GPS stations data were processed to obtain horizontal and vertical displacement velocities in each station. The results showed almost all stations move toward southeast with the velocity rates range from 1.034 cm/yr to 5.674 cm/yr, except BM33 and SB07 that moves northeast with the velocity rates 4.065 cm/yr and 3.312 cm/yr respectively. For the vertical displacements, almost all stations subject to subsidence with the rates range from -0.190 cm/yr to -5.769 cm/yr. Only three stations subject to uplift namely BM23 with the rate of 0.234 cm/yr, BM24 with the rate of 2.844 cm/yr, and BM29 with the rate of 3.33 cm/yr. The strain analyses showed large shortenings in the area between two faults with the values up to 11.95 μstrain. From the results, we can conclude that the surrounding area of the two faults have different deformation patterns, and by confirming with geological data, we suggest that Surabaya has an earthquake potential due to the active faults.
Determining the initial time of anthropogenic subsidence in urban area of Indonesia
Authors: Andreas H , Abidin H Z , Sarsito D A , Pradipta D
Published: December 2019

Land subsidence in urban area of Indonesia like Jakarta, Bandung, Semarang, Pekalongan and others is quite well known today. Base on the geodetic measurements (e.g. Leveling, GNSS and InSAR) we can identify rates per year and also magnitude in certain periods. Nevertheless the initial time of its occurrence, especially a part influenced by anthropogenic causes, in many cases still remains unclear due to data limitation. This is an interesting research question because the initial time is crucial for determining total magnitude, while this total magnitude is important information for assessing the impact of subsidence. For example to understand the occurrence of tidal inundation, widening area of flood, calculating cost of adaptation, water table inversion, etc. we need to know quite exact the total magnitude of anthropogenic subsidence from its first initiation. Luckily we have long data measurements of subsidence in Jakarta, long data observation of groundwater in several urban areas and times series of images satellite that can be used for determining the initial time of anthropogenic subsidence in urban area of Indonesia. This paper will highlight how these data set answering quite well the research question.
Application of augmented reality and close range photogrammetry technology for mapping of cultural heritage areas (case study: Ai Renung Site, Sumbawa Regency)
Authors: Aljabar A A H , Cahyono A B , Hidayat H
Published: December 2019

The Ai Renung site is the first megalithic complex site on Sumbawa that has 8 sarcophagus objects and has been used as an ancient park by the NTB Provincial Cultural Heritage Preservation Hall. Unfortunately, until now it does not have a cultural heritage map that describes the location and condition of the site, so the presentation of spatial information that describes the location is not conveyed to tourists. In this study, an augmented reality application was made from a combination of 3D model visualization and orthophoto maps. Augmented reality application is implemented on an Android device. Application users can see the visualization of the 3D sarcophagus model virtually using an Android device when scanning one of the markers found on the Ai Renung Site Cultural Heritage Map. This study also analyzes 3D models and orthophoto. The results of the control point analysis on orthophoto, the RMSE value of 0.293 m was produced. Based on the CE90 test of the RMSE value, orthophoto can be used as a base map in making Cultural Heritage Zone Maps with a scale of 1: 1000 and entering into order class 3. As for forming a 3-dimensional model, most 3D model objects have RMSE values that are less than 0.5 m. So that it meets the Level of Detail 3 order criteria.
Geometric accuracy analysis of the measurement Ground Control Point (GCP) in the rectification process of high resolution satellite image with polynomial method (case study: Wlingi Sub-district, Blitar Regency)
Authors: Taufik M , Puspitasari V P
Published: December 2019

High resolution imagery can be used in basic map making process. Basic map is basic data used for Comprehensive Systematic Land Registration (PTSL) making. However, the use of high resolution imagery is still has geometric errors that must be eliminated by performing rectification process. This study took place in Wlingi Sub-district, Blitar Regency. In this research polynomial method orde 1, 2, and 3 are used in rectification process. This method is done to obtain the best results of rectification process. Determination of the number of Ground Control Point (GCP) in orde 1, 2, and 3 are the main focus in this study. Geometry accuracy analysis is done by calculating the Root Mean Square Error (RMSE) of GCP used in this rectification process and testing the statistics of the distance of the image rectification with distance in the field. The results showed that polynomial method in orde 1 with 5 GCP points produced 0.487 m RMSE, orde 2 with 8 GCP points produced 0.397 m RMSE, and orde 3 polynomial with 12 GCP points produced 0.326 m RMSE. In this study all of polynomials method orde 1, 2, and 3 are suitable for making basic maps for PTSL baseline data Wlingi District, with a scale of 1:1,000 in grade 3.
Identification of permanent surface water in Bengawan Solo River downstream area, Indonesia using Sentinel-1 imagery
Authors: Bioresita F , Puissant A , Taufik M , Gasica T A
Published: December 2019

Permanent surface water is defined as area of the Earth continental surface corresponding to an accumulation of water, showing slight variations in water levels, retaining most of their volumes over the year and that do not dry up. Bengawan Solo watershed, especially in the downstream area is situated in East Java, Indonesia and is recorded as the longest and the largest river on Java Island. Thus, this river becomes one of the biggest water resources in Java, Indonesia. As a water resources, it is important to identify spatial distribution of permanent surface water in Bengawan Solo River. Synthetic Aperture Radar (SAR) is an effective way to detect surface water over large areas. Sentinel-1 is a new available SAR and its spatial resolution and short temporal baselines have the potential to identify permanent surface water. Thus, we propose an identification of permanent surface water using Sentinel-1 data. The quantitative evaluation shows relevant results with overall accuracy of more than 97%, F-measure provides value 0.79, also very low False Positive Rate and commission error. There are also morphological and land use change detected in the area. These results are encouraging and the first step for monitoring Bengawan Solo River.
Analysis of ionosphere changes due to earthquakes (case study: Regency of Lombok and Donggala)
Authors: Cahyadi M N , Prasetyo M T A
Published: December 2019

Earthquakes will form and propagate atmospheric waves, rayleigh waves, acoustic waves and gravity waves. When acoustic waves reach the ionosphere, this affects the ionospheric electron density that can be known from GNSS signals, this disorder is commonly called CID. Electromagnetic waves transmitted by GPS satellite signals that pass through the ionosphere will cause a delay in time, from this data can be used to detect the presence of ionospheric variations through TEC values. In this study an analysis of ionospheric changes due to the earthquake that occurred in Lombok Regency and Donggala Regency. The result of the analysis show that the value of ionospheric disturbance from 5 August – 28 September 2018 was around 0.19 TECU – 0.56 TECU.