bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Load Recovery Optimization Strategy Based on Power Grid Partition
Authors: Huo Yingzhe , Wang Ting , Wang Qun , Xia Fei , Yin Xiaohua , Li Feng , Yu Hua
Published: August 2019

Aiming at the problem of fast load recovery after power system blackout, an intelligent optimization strategy of load recovery based on grid partition is proposed. An optimal regionalization strategy for system recovery after major blackouts is proposed. In the optimization model, factors such as charging reactive power of overhead lines for generator recovery and closing times of lines for load recovery are taken into account. After optimizing the large-scale system partition, a unified load recovery optimization model considering network reconfiguration factors is established for each partition to realize the parallel load recovery of each partition. Aiming at the optimization model proposed above, the load recovery optimization problem based on power grid partition is solved by combining traditional graph theory and genetic algorithm. In the solution, the genetic algorithm is improved, and aiming at a large number of infeasible problems arising from the application of genetic algorithm, a method of random load rejection and shortest path repair strategy is proposed, which further improves the optimization efficiency and global optimization ability of the algorithm. The correctness and effectiveness of the proposed model and method are verified by simulation analysis of IEEE30-bus system.
Research on a New Method of Power Grid Zoning and Layering Based on Dijkstra Algorithms
Authors: Wang Qun , Wang Ting , Huo Yingzhe , Xia Fei , Yin Xiaohua , Li Feng , Yu Hua
Published: August 2019

With the development of high voltage grid, it is the trend of future grid development to unlock the electromagnetic loop network and carry out grid layered and partitioned operation. Subarea operation of power grid can effectively alleviate the complex structure of current grid and the serious problem of short-circuit current exceeding the standard. A new power grid partitioning method based on Dijkstra algorithm is proposed. Firstly, according to the knowledge of graph theory, the power network is transformed into a network topology graph, and the impedance of stations and lines in the grid structure corresponds to the nodes and weights in the topology graph. Then, Dijkstra algorithm is used to find the shortest distance from the initial point within the prescribed distance, and the required site and the initial point are divided into the same partition. Taking 500 kV/220 kV power grid as an example, because the development trend of future power grid is that high voltage grade grid plays a supporting role, and the sections are connected through tie lines, so 500 kV stations are selected as the initial point, and finally several zones supported by 500 kV stations are determined. The proposed method can be programmed for fast computation without multiple solutions. Finally, the feasibility and practicability of the proposed method are verified by the example of IEEE30 bus system and the actual power grid in a certain area.
Separately Excited DC Motor Speed Tracking Control Using Adaptive Neuro-Fuzzy Inference System Based on Genetic Algorithm Particle Swarm Optimization and Fuzzy Auto-Tuning PID
Authors: Elhaj Ahmed Mohamed Mohamed , Guo Yanling
Published: August 2019

This paper presents detailed comparative studies to control the separately excited DC motor speed. The configurations of proposed methods are fuzzy auto-tuning PID and Adaptive Neuro-fuzzy inference system. The study intends to optimize the parameters of the transient speed response, for instance, the overshoot, settling time and rise time. Also, a comparison has been made between the two suggested controllers. PID tuned by Ziegler Nicholas’s method utilized as a basis for the proposed controllers. Furthermore, PID model is used to extract the data set for ANFIS configuration, which has been manipulated by genetic algorithm and particle swarm optimization to ensure that it will be able to cover all operation condition possibilities. In order to investigate the eligibility of the suggested controllers, the model of the DC Motor is tested under several conditions. Finally, the results which implemented using Matlab-Simulink toolbox showed that fuzzy auto-tuning PID controller is too complicated, and has slow dynamic response comparing with ANFIS controller. Moreover, ANFIS has rapid robustness efficiency, also in the domain of the motor response characteristics. ANFIS expressed superior proficiency and better Keywords: SEDC motor, fuzzy auto-tuning PID, Adaptive Neuro-fuzzy inference system (ANFIS), genetic algorithm, particle swarm optimization, data set, and FIS. Performance under various experimental conditions.
Analysis on the Cause of Excessive Gas Content in 1000kV Transformer Insulation Oil
Authors: Zhang Wenbo , Guo Fengbo
Published: August 2019

Air tightness of syringe and sampling process were investigated, and gas content of transformer insulating oil was repeatedly measured, Based on the existing problems of excess gas content after partial discharge of 1# main transformer B phase of a 1000kV substation transformer insulating oil during the construction stage. The results show that excessive gas.
Simulation of Train Energy Consumption Based on UAS
Authors: Zhou Hongyu , Feng Jiahui , Shen Jun , Cheng Liu , Wang Qingyuan
Published: August 2019

High-speed trains are all electric locomotives. During the operation of EMU, the power supply network will be cut off due to bad weather, high voltage cable dropping off, catenary failure and power supply system failure, which will cause the whole train line to stop running and a large number of passengers to stay, causing serious harm. Therefore, on the vehicle energy management simulation platform UAS, a large number of simulations have been carried out for different vehicle energy storage, traction constant speed and operation modes, and the effects of initial battery power, constant speed and operation mode on traction energy consumption, auxiliary energy consumption and train operation time have been explored. The simulation has good application prospects in the future intelligent high-speed railway construction.
Simulation Analysis of Frequency Regulation
Authors: Liu Zhijian , Chen Xiaoya , Luo Linglin , Wang Yanhong , Liu Xiaoxin , Yu Sha
Published: August 2019

Frequency is one of the most important parameters reflecting the operation quality of the system. When the system is in steady-state operation, the frequency of the generator in the system is equal under steady-state operation. Because the load is changing at any time, this kind of balance is dynamic. The only way to maintain dynamic balance is to adjust the input power of the generator, so that the actual output of the generator can closely track the change of the load and keep the balance between supply and demand of active power. The essence of frequency control is to regulate and control the active power of all generators in power grid. In this paper, the principle of frequency fluctuation is analyzed, and the physical models of the primary and secondary frequency modulation are established. The simulation results verify the differential regulation of the primary frequency modulation and the no-difference regulation of secondary frequency modulation. It provides an effective basis for the later research of AGC control strategy.
The Mathematical Model for a Prediction of Residual Discharge Time
Authors: Zhang Hanping
Published: August 2019

The mathematical model is established by using the sampling data of the discharge curve of different batteries and the recording data of different attenuation state discharge of the same cell. Analysis of the same batch of new battery at different discharge current intensity test complete discharge curve of sampling data, based on quadratic function model, through matlab simulation, get the current strength of the corresponding function. In order to find the residual discharge time of the battery and the higher accuracy of MRE, select the relation between the time and voltage of the exponential function. Finally, in the model improvement, the turning point of the discharge curve is the segmentation point, and the discharge curve is fitted with the.
Removal of 1-hymxyethylidene-1, 1-diphosphonic Acid of Organic Phosphorus Scale Inhibitors in Circulating Water
Authors: Ji Ruijuan
Published: August 2019

In order to remove 1-hymxyethylidene-1, 1-diphosphonic acid (HEDP) of organic phosphorus scale inhibitors in circulating water effectively, a chemical precipitation method has been used. The influences of parameter on HEDP removing rate, such as species and dosege of chemical precipitation agent, reaction time, are studied, so that the optimal conditions are confirmed. The results show that the HEDP removing rate can be higher than 95% and the relative standard deviation of mesured value is less than 1%, when the mass concentration of FeSO4 is 2 g/L, the dosage of Ca (OH)2 is 0.052 g, and reaction time is 30 min. This method is simple and rapid, has high precision and good reproducibility, can be used to remove organic phosphorus by factory, with broad application prospect.
Polyvinyl Alcohol / Fulvic Acid Composite Adsorbent Gel Prepared by Microreactor
Authors: Zhang Lin , Leng Chunbo , Du Guofeng
Published: August 2019

Polyvinyl alcohol/fulvic acid (PVA/FA) composite hydrogel was synthesized in a microreactor using fulvic acid and polyvinyl alcohol as raw materials. The adsorption properties of the composite hydrogels for Pb2+ in water were investigated. The results show that the PVA/FA composite hydrogel is a three-dimensional porous network structure with uniform pore distribution and long-time water stability. When the mass fraction of fulvic acid was 1.5% and the freeze-thaw times were 3 times, the rate of saturated adsorption of PVA/FA composite hydrogels could be reaching to 72.3%.
Characteristics of an aerobic denitrifier isolated from unconfined aquifer
Authors: Zhu Xiaoming , Zhao Donghua , Pan Zarong , Zhang Wen , Ruan Xiaohong
Published: August 2019

An aerobic denitrifier strain named X11 was isolated from the shallow unconfined aquifer samples in Suzhou city, China. According to the physiological biochemical identification and the 16S rDNA gene analysis, the strain X11 was generally identified as Pseudomonadales Pseudomonadaceae. Single factor experiments were used to investigate the influence of temperature, pH and carbon sources on its growth and denitrification characteristics. The results showed that under aerobic conditions the total nitrogen loss and nitrate reduction efficiency within 60 hours were up to 70.3% and 95.1%, respectively, with initial nitrate concentration of 276.25 mg/L. The nitrate removal rates reached 18.24 mg/L·h within 12 hours. It was found that strain X11 can convert nitrate into nitrogen gas without obvious accumulation of nitrite under aerobic conditions. The pH increased and ORP decreased by activated denitrifier in liquid medium. the optimum conditions were obtained as follows; temperature value of 30° C, pH value of 7. The results indicate that the isolated aerobic denitrifier XK11 has high nitrogen removal efficiency, it may be a good candidate for in-situ bioremediation of nitrogen-contaminated shallow groundwater or aerobic wastewater treatment.
A Visible-Light Curing system of Diphenyliodonium Salt/BODIPY dyes/Bisphenol-A Epoxy Resin Under Halogen Lamp
Authors: Li Tao , Chen Yu , Liu Ran , Lu Ziyi , Wang Tao , Huang Xiping , Zhang Qi
Published: August 2019

Bisphenol-A epoxy resin have attracted much attention due to its good mechanical properties after curing. In this paper, a visible light curing system of bisphenol-A epoxy resin (E51) initiated by diphenyliodonium hexafluorophosphate (IOPF) and boron dipyrromethene-based (BODIPY) photosensitizers (BODIPY-1 and (BODIPY-2) under a halogen lamp (380-580 nm) was investigated. BODIPY dyes are well known long-wavelength photosensitizers, which is good for IOPF to expand absorption to visible light region. BODIPY-1 and BODIPY-2 are intermediates that reported in our previous work. When IOPF/BODIPY-1 is 2wt%/1wt%, E51 achieves epoxy conversion up to 60% in 0.18 mm thick molds. The Illumination of the halogen lamp is as low as 25.0 mW/cm2. Under same condition, the epoxy conversions of IOPF/BODIPY-2/E51 and IOPF/E51 are about 50% and 20%. When filters were used, IOPF/BODIPY/E51 was effectively cured under light irradiation of 460 nm and 540 nm, and only IOPF is not able to initiate E51 at these wavelengths.
Isolation and characterization of heterotrophic nitrifying bacteria and the removal of pollutants in black and malodorous water bodies
Authors: Zhang Wenjun , Wei Wei , Xing Yan , Zhao Yongzhi , Guo Xiaoying , Liu Mengyan , Cui Qi , Huang Junshe , Yao Xiaohan
Published: August 2019

Aiming at the problem of high concentration of COD and NH3-N in black and odorous water bodies, heterotrophic nitrifying bacteria which can remove ammonia nitrogen and organic pollutants were screened out in the laboratory simultaneously. A heterotrophic nitrifying functional group was constructed by using the strategy of bacterial source reorganization ecologically, and the removal effect of heterotrophic nitrifying functional bacteria on organic pollutants and ammonia nitrogen in water was studied. The results showed that the removal rate of ammonia nitrogen in the water was more than 52%, and the removal rate of COD was 57%∼86%. The effect of heterotrophic nitrifying functional bacteria group 1 on the removal of COD and ammonia in water was better, and the removal rate was 76.5% and 54.8%, respectively. The optimum inoculation test showed that the optimum inoculation amount of the heterotrophic nitrification bacteria group 1 was 10 ppm.
Urea solution of single droplet pyrolysis characteristics research and engineering application
Authors: Chen Hao , Xu Junfeng
Published: August 2019

The experimental bench for the pyrolysis characteristics of single droplets of urea solution was established to analyze the variation characteristics of the whole process of single droplet evaporation pyrolysis. The results show that there are a large number of bubbles in the droplets which are very favorable for pyrolysis, the pyrolysis energy and atomization degree are insufficient, leading to the formation of intermediate products, greatly reducing the efficiency of denitrification. Based on the experimental data, the urea pyrolysis system was developed and designed for the SCR denitrification project of a coal-fired boiler in a thermal power plant, and key equipment was optimized, including urea storage and supply system, denitration reactor system, spray gun device, pyrolysis furnace body, etc. The system was put into operation. After that, the NOx concentration was reduced from 250mg/Nm3 to 20 mg/Nm3, and the denitration efficiency reached over 90%. The project has strong engineering application value.
Bearing capacity evaluation of asphalt pavement based on dynamic deflection equivalent
Authors: Fan Qian , Li Shanqiang , Xu Xinquan
Published: August 2019

In order to accurately evaluate the bearing capacity of asphalt pavement structure, the research group, on the basis of real-time temperature data of five kinds of asphalt pavement structure in Daxin experimental road, obtain the dynamic modulus main curves of various types of pavement materials and FWD dynamic modulus of the load acting frequency through dynamic modulus research in laboratory, and determine the dynamic modulus of the pavement structure material true value. According to the principle of dynamic deflection equivalent, this paper puts forward the evaluation method of predicting the bearing capacity of asphalt pavement based on composite modulus determination, pavement structure inverse calculation and bending stiffness modulus attenuation threshold. The evaluation results of five kinds of asphalt pavement structure bearing capacity of experimental road are consistent with the actual performance, which shows that the evaluation method of bearing capacity of asphalt pavement structure based on dynamic deflection equivalent is reasonable and effective.
Status of Microbial Remediation Technology in Petroleum Contaminated Land
Authors: Xia Longfei
Published: August 2019

Leakage accidents occur frequently during the process of oil exploitation, storage and transportation. Effective management of the soil contaminated by it has become the focus of social attention. This paper introduces the oil pollution problem and physical, chemical and biological treatment methods. It focuses on the classification and application status of microbial remediation technology, and discusses the key factors that restrict bioremediation effects such as degrading microbial screening and colonization, and improving the bioavailability of petroleum hydrocarbons.
Effects of Cadmium Stress on Microbial Community Diversity in Soil Potted With Sasa Argenteastriatus
Authors: Yin Peng , Liu Xiaojie , Liao Jinhua , Hu Xia
Published: August 2019

In order to understand the remediation mechanism of cadmium-contaminated soils, pot experiments were conducted to study the effects of cadmium stress on soil microbial biomass and soil microbial diversity in Sasa argenteastriatus plantations. The results showed that Cd stress significantly changed the characteristics of soil microbial biomass carbon content, and the level of soil microbial biomass carbon was higher than that of the control when under 0.5mg/kg Cd stress. Heavy metals significantly inhibited soil microbial biomass carbon at higher concentrations of cadmium ( > 5 mg/kg). Cadmium pollution significantly changed the structure of bacterial communities and promoted the growth and development of some tolerant bacterial species (hongkongensis and ovatus) at a low level of cadmium stress of 0.5mg/kg. High concentrations of cadmium caused stress that significantly inhibited the growth of Baclicus thermoamylovorans and Baclicus foraminis. These preliminary results reveal the response of soil microbial community structure to heavy metal pollution, and provide a theoretical reference for early warnings of trends in soil quality changes.
Preparation of Phosphorus and Oxygen Co-Doped With Graphite Carbon Nitride and Its Application in Photodegradation of Methylene Blue
Authors: Hu Fengping , Luo Wendong , Peng Xiaoming , Hu Yuying , Dai Hongling
Published: August 2019

In this study, phosphorus and oxygen co-doped graphite carbon nitride has been successfully prepared by simple thermal copolymerization. The as-prepared materials were characterized by SEM, XRD, XPS and UV-vis-DRS. The results showed that phosphorus and oxygen were successfully doped on the structure of graphite carbon nitride. Photocatalytic degradation of MB in solution by the catalyst has been studied, POCN-1 has the best photocatalytic activity among of the as prepared materials, photocatalytic degradation rate of MB is 10.6 times higher than that of g-C3N4. The main reason for its enhanced photocatalytic performance is that the co-doped of phosphorus and oxygen elements would change the electronic structure of g-C3N4, reduce the forbidden band width of the photocatalyst. At the same time, can extend the absorption boundary of visible light.
Effects upon Olive and Changes of its Physiological Status under the Compound Stresses of Ferrum and Zinc
Authors: Yang Weifei , Liang Jian , Liu Xie
Published: August 2019

Based on the high value of olive oil, this experiment was carried out in order to study its growth under heavy metal stress. In the experiment, Fe and Zn were used as heavy metal stress factors. Effects of Fe-Zn combined stress on physiological indexes of malondialdehyde (MDA), soluble sugar, SOD, POD, CAT and soluble protein in olive leaves. The results of the last experiment showed that with the increase of Fe2+ and Zn2+ concentration, the activity of POD and CAT showed a trend of increasing first and then decreasing, and the activity of SOD enzyme was always decreased. Malondialdehyde (MDA), soluble sugar content and accommodating protein the content is gradually increasing.
Strategy 3M plus to reduce incidence disease dengue haemorrhagic fever in Public Health Centre (PHC) Tigo Baleh Bukittinggi West Sumatra-Indonesia
Authors: Alhamda S , Barlian E
Published: August 2019

Disease of Dengue Haemorrhagic Fever (DHF)) is contagion which because of virus dengue and contagious through larva mosquito of Aedes aegypti. This disease can attack everybody and death. In Bukittinggi represent non-area of endemic DHF, but almost every year the progress of occurrence DHF, District which at most case of DHF is Aur Birugo Tigo Baleh (ABTB), besides wide of smallest area also there is environmental factor which related case of DHF. This Research aim to know related of existence larva mosquitoes Aedes aegypti and Implementation of 3M Plus with improvement incidence disease Dengue Haemorrhagic Fever in PHC Tigo Baleh Bukittinggi. Research method is analytic survey with study design of case control use test of chi square. Research location in District of ABTB, its research responder is 78 with technique of totally sampling. The research show existence snap fingers at house snapping fingers at and suffering DHF 61,5%, do not snap fingers at and suffer DHF 38,5%. Value of House Index (HI) 43,6%, Container Index (CI) 17,9%. Implementation of 3M Plus unfavorable and suffer DHF 69,2%, while implementation of 3M Plus good and suffer DHF 30,8%. From result of research pvalue=0,003 (p<0,05), there are relation existence larva mosquitoes Aedes aegypti with Improvement incidence disease Dengue Haemorrhagic Fever and pvalue=0,040 (p<0,05), there are relation of 3M Plus with Improvement incidence disease Dengue Haemorrhagic Fever. Suggested, Public Health Service in Bukittinggi and PHC Tigo Baleh conduct socialization and enableness of society to join in to conduct eradication of mosquito Aedes aegypti regularly so that can degrade number incidence of disease DHF.
Pollution load capacity of Batang Kuranji River, Padang City
Authors: Azhar A , Barlian E , Dewata I , Amran A , Teguh A , Danhas Y
Published: August 2019

This study aimed to determine the pollution load capacity (DTBP) of Batang Kuranji River against the parameters of Total Suspended Solid (TSS), Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD). In general, pollutant sources are caused by developments and activities of urban communities such as domestic activities, industry, agriculture and other activities. This research is descriptive quantitative by using Qual2KW method with the sampling location point on the representative of land use located along the kuranji stem river as many as 24 sampling locations, which are divided into 24 segments, spatially from upstream to downstream. The results showed that the parameters of Total Suspended Solid (TSS) were seen from upstream to downstream in the area of sections 8, 10, 14 must be reduced pollution load of 648 kg / day (section 8), 15,552 Kg / day (section 10) and 22,032 Kg / day (section 14), this is due to (1) economic activities of the community in the agricultural sector, in the form of rice fields directly adjacent to the Batang Kuranji river which can cause erosion, (2) livestock sector activities in the form of chicken farming, where the community directly discarding the remnants of chicken feed is discharged directly into the river so that it can increase the pollution load of TSS parameters. Parameters of BOD in Section 6 and Section 16 must be reduced by a pollution load of 453.60 Kg / day (Section 6), 1,308.96 Kg / day (Section 16), This is due to this high pollutant source such as: (1) domestic / domestic waste activities, (2) rice field agriculture. Whereas the COD parameters in areas 3, 7, 14, 15, and 16 must be reduced by 3,862 kg / day (section 3), 16, 783.20 kg / day (section 7), 3,149.28 Kg / day (segment 14), 9,629.28 Kg / day (section 15) and 22,589.28 Kg / day (section 16), this is because there are still many agricultural, plantation and livestock areas so that many sources of pollutants enter the Batang Kuranji river from chemicals organic so that the river water in Batang Kuranji can still accept pollution loads, for the COD parameter the approach is more inorganic chemistry and there are many inorganic chemical compounds in the disposal of liquid waste in the Company / Industry. With the quality conditions of the current Batang Kuranji River in the Padang City segment, control efforts are needed for the pollution. Related to the results of the study, and from the conclusions obtained, the efforts made for optimal control are the application of environmentally sound spatial principles.
The use of sugar-cane waste (Bagasse) energy as substitution of fossil-fuel energy in Krebet Sugar Factory, East Java, Indonesia
Authors: Eka Sari Kartika , Meidiana Christia
Published: August 2019

Industry is one form of economic activities that process raw material and/or utilize industry resource to produce product with a higher value or benefits. Rapid growth of industrial activities an increase community’s welfare. While on other side, industrial development can increase the value of CO2 emission that can influence global warming. Krebet Sugar Factory in one of the largest sugar industries in Indonesia and so far, still using fossil fuels (gasoline, diesel, residue oil) as energy resource in production process. Based on 2011 National Greenhouse Gas Emission Reduction Action Plan, CO2 emission reduction’s target in Indonesia, especially in industrial sector for year 2020 is 0,001 Gton CO2 (Scenario 26%). One of mitigation action that can be done to support CO2 emission reduction is using alternative energy resource/fuel bagasse. The aim of this research is to evaluate utilization of factory waste for alternative energy resource/fuel (bagasse). Krebet Sugar Factory have production capacity of 840 ton/day. Average of Electricity resource provided by PT. PLN is 26,40 KVA/month, while the electricity average usage provided by Krebet Sugar Factory’s power plant is 4.320 KVA/month and Krebet Sugar Factory Fuel’s consumption for one year is 19.500 ton. Based on production data, average bagasse production of Krebet Sugar Factory is 420.533,34 ton so can produce energy value in the amount of 4.878,19 Terajoule that can be used as an alternative energy resource.
The endurance test of Nannochloropsis sp. paste isolated from Lampung Mangrove Centre (LMC)
Authors: Tugiyono  , Setiawan Agus , Rusyani Emy , Suharso  , Nurjannah Siti
Published: August 2019

Nannochloropsis sp. has been used as natural feed because it has high nutrition that is good for fish larva growth and development. However, the Nannochloropsis sp. availability continually is in insufficient amount and this often becomes a problem in culturing because this is difficult to culture in mass volume. The objective of this research was to make Nannochloropsis sp. paste and to test the paste quality based on the life endurance of Nannochloropsis sp. cells from isolate of Lampung Mangrove Centre in intermediate scale culture by using different fertilizer combination and NaOH doses. This research used factorial completely randomized design with two treatments and three repetitions. The first treatment was administration of agricultural fertilizer combination of (P) urea 40 ppm, ZA 20 ppm, and TSP 5 ppm, and Conway (C) technical fertilizer as control. The second treatment is the administration of NaOH doses of: 100 ppm, 125 ppm, 150 ppm, and 175 ppm. Data were analyzed by using One Way Analysis of Variance (ANOVA), and Least Significant Difference test with α = 0.05 was performed whenever any significant difference was found. The research result showed that Nannochloropsis sp. paste from isolate of Lampung Mangrove Centre had highest life endurance level with Conwy technical fertilizer and dose of NaOH 100 ppm with population density of 18066666.67 x 104 cell/mL.
The geodiversity potential of Tanah Datar District developing into a geotourism asset as a geopark in Indonesia
Authors: Osronita  , Anwar Syafri , Heldi  , Barlian Eri
Published: August 2019

This study aims to determine the geodiversity potential of Tanah Datar District, developing into a geotourism asset as a Geopark in Indonesia. This type of research is qualitative descriptive research. The research data acquisition technique was carried out by observation, literature study, interview, FGD (Focus Group Discussion), the method used to determine the delineation of the geoheritage area using the Geographic Information System (GIS) using GIS Arc Software 10.5. The results of geodiversity potential research in Tanah Datar District consist of 3 geosites; 1) Mount Marapi, Mount Singgalang-Tandikek, Straightness of Five Fault Lake (5) Fault Lake and Active Sectional Tectonic Lake 2) Waterfall from hot spring 3) Straightness of Andesite Intrusion. The Geo Area Tabek Patah Salimpaung Normal Fault includes geosite; 1) Straightness of Fault and Fault Talent 2) Lineage of Telaga Line Saga Telaga Air Pakis and Telaga Air Taranang. Geo Lintau Buo Karst Area with Geosite 1) Eksokarst 2) Sinkhole 3) Underground River 4) Goa / Ngalau with Stalactite-Stalagmite 5) Dolina. The potential of this geodiversity is Geotourism Assets and the potential for the development of Indonesian Geopark.
Study on sustainability status of smallholder oil palm plantations Jambi Province, Sumatra Indonesia
Authors: Rosyani  , Edison  , Asmadi
Published: August 2019

The growth of oil palm plantations in Indonesia is growing rapidly. Issues of oil palm plantations that are not environmentally friendly are continuously exposed. The purposes of this research are, 1) To determine the role of smallholder in managing oil palm plantations, 2) To analyse the status of sustainability of oil palm plantations, 3) To find sensitive attributes that affect the sustainability of smallholder oil palm plantation management. Analysis method is to answer the first objective which is done descriptively, the second objectives was conducted with MDS approach, with Rappalm, third objectives are to analyse attribute lever was conducted with Leverage analyse. The result of the research is that smallholders can cultivate oil palm plantations. The status of sustainability indicated a very sustainable status (80.41), meaning that economic factors and social factors leverage ecological factors to be sustainable. This means that smallholder should improve the pattern of oil palm crop farming, with lever attributes, namely tree planting among islands of oil palm (plot scale). The integration of sensitive attributes, with the economic dimension and social dimension, produced a research output which have provide solutions sustainability of the smallholder oil palm plantation.
The contributions of discipline and environmental knowledge on clean behavior of students in Public Elementary School 19 Kampung Baru Pariaman, West Sumatra
Authors: Syah Nurhasan , Edinov Sanny
Published: August 2019

This study aims to obtain a description of the contribution of discipline and environmental knowledge to the clean behavior of students in public elementary school of 19 Kampung Baru, Pariaman. Quantitative approach was used in this research. The sample of this research were the students in grade I-VI at public elementary school and taken by simple random sampling of 81 students. The data were collected by asked to fill in the questionnaires. Results showed that: (1) There was a contribution of discipline (X1) to students clean behavior (Y) equal to 27.70%, (2) There was a contribution of environmental knowledge (X2) to students clean behavior (Y) equal to 53.00% And (3) There was a contribution of discipline (X1) and environmental knowledge (X2) to the students clean behavior (Y) of 54.20%. The results suggest that the discipline (X1) and environmental knowledge (X2), either individually or jointly contributes to students clean behavior (Y). This provides some explanation as to why principals and teachers in school should monitor the students discipline and environmental knowledge. This knowledge can support the clean behavior to the surrounding environment. On the other hand, it is also advisable for students to always improve their own discipline and environmentalknowledge.
The role of natural science courses to implement the environmental education in elementary school (curriculum 2013)
Authors: Titiek Winanti E , Kustini Indiah , Rahmadiyanti Erina
Published: August 2019

Human behaviour is strongly influenced by prerequisite knowledge, residential, working place, and schools/studying place situation as well as friend or companion’s behaviour. Soldiers have different behaviours compared to educators, doctors, farmers, traders, and so forth. To make students become environmentally friendly-human beings, they need to have knowledge on how to protect the environment. Since 1986, the Republic of Indonesia government has included environmental education into school curriculum; and the end is the 2013 curriculum (C-13). There are eight subject courses in elementary school’s 2013 curriculum. Of the eight subjects, Natural Science is relevant subjects as a means to implement the environmental education (EE) concepts. Natural Science is taught in grades IV, V, and VI using thematic approaches for 9 x 40 minutes a week. However, the implementation of C-13 in elementary schools is still less optimal because there are still many prerequisite factors to be fulfilled, such as: infrastructure, learning resources, teachers’ skills, and assessment systems. In conclusion, Natural Science subjects has a significant role to debrief the environmental education concepts especially in elementary school. Thus, learning model and media of natural science need to be further developed.
Mapping of potential green city attributes in Batu District, Batu City
Authors: Utami Azis Sri , Eka Sari Kartika , Nirvana Hanita
Published: August 2019

Batu District is located in Batu City defined as BWK I which is designated as central government development, modern trades and services development, tourism development, supporting services of tourism accommodation and education area. As the center of city development, the area / development that occurs in Batu District will have an impact on the increase in temperature. This research aims to identify the Batu District based on green city attributes such as green open space, green waste, green water, green transportation, green energy, green building, green planning and design, and green community that can be developed in Batu District. The method of analysis in this research are using descriptive analysis to determine the attributes of green city that can be found in Batu District. Based on the description of the seven attributes of Batu City, it is known that Batu City has 5 green city attributes that are being developed, namely Green open space of 32.317 m2, Green Waste (separate waste bins and 5 garbage bank communities), Green Water (29 9 units of recharge wells, 4 communal waste water treatment plant (WWTP) and 1 individual WWTP. Green Energy (30 units of biogas) and Green Community (5 green city observers). As for the development of Green Building and Green Transportation attributes have not been done in Batu City.
Critical land mapping for the development of biomass-based energy in East Lombok Regency, Indonesia
Authors: Narendra B H , Widiatmaka  , Kusmana C , Karlinasari L , Machfud
Published: August 2019

Utilization of critical land as woody biomass plantations need to be supported by information on the potential of critical land. The objective of this research was to delineate a critical land using remote sensing and GIS techniques combined with Analytical Hierarchy Process method. The parameters used were land use/cover, slope, rainfall erosivity, tolerable soil erosion, soil erodibility, land management, and land productivity. The Analytical Hierarchy Process method was used to provide the weight of each parameter. Land use/cover map was interpreted from SPOT-7 satellite imageries acquired in 2017. The other parameter maps were built based on reference maps, secondary and field data collection as well as soil sample analysis. The resulted map showed that 32.7% area of East Lombok Regency was categorized as a critical area. Based on the land status, the critical land area located in the State Forest was smaller (42%) than on the Area for Other Utilization (58%). Utilization of critical land as woody biomass plantation should be prioritized on the shrub-covered land using community forest scheme, while for the area of State Forest, the plantation can be only planted in the production forest area applying industrial plantation forest or community plantation forest scheme.
Determining the public understanding on the public policy based on cosmopoliteness and innovativeness
Authors: Rahmatulloh  , Made Putrawan I , Yufiarti
Published: August 2019

The aim of this research is to determine the relationship between Cosmopoliteness, and Innovativeness with the public understanding on public policy in Jakarta, Republik Indonesia. A survey method was applied with a correlational study. The respondents were the heads of families and 120 samples were chosen randomly. There were four instruments which measured the public comprehension (rel..922), Cosmopoliteness (rel. .912), and Innovativeness (rel. .935). Data were analyzed by two-way ANOVA. The result of this research was revealed that there was positive and significant correlation among those variables. Therefore, it is concluded that to increase the public’s understanding on public policy, reinforcement in aspects of Cosmopoliteness and Innovativeness need to be improved.
Evaluating the implementation of Konawe regional regulation number 5/2007 on public mining management
Authors: Yuslan  , Nadiroh  , Mukhtar Mukhneri
Published: August 2019

This research aims at determining the implementation of Konawe regional regulation number 5/2007 on public mining management, with the focus on a C-Class mining activities in Tuoy Village. Tuoy Village, Unaaha District, is one of the center of C group mining activities in Konawe Regency, Southeast Sulawesi Province. It is recommended to the Regional Government and all elements involved in mining management to take concrete steps in preventing further damage to the environment in the futureby maximizing the implementation. To find out the implementation of Konawe Regional Regulation Number 5/2007 on Public Mining Management the writers use Merilee S. Grindle model of approach. The level of success of a public policy according to Grindle is determined by the level of policy implementation itself, which consists of the Content of Policy and the Context of Policy.
Study on Q modulation of longitudinal polarization electro-optical diffraction based on MgO: PPLN crystals
Authors: Wang Y H , Li Y , Liu H , Liu H Z , Yu Y J , Jin G Y
Published: August 2019

We add electrodes to the upper and lower surfaces of periodically polarized lithium niobate, and load voltages at both ends of the electrodes. Without introducing additional devices, we construct an electro-optic Q modulation mode similar to the principle of acoustooptic Q modulation. The diffraction characteristics of light propagating along the x-axis of PPLN are simulated, and the diffraction characteristics of the incidence Angle in Prague and electro-optic diffraction Q of the load voltage are studied. On the basis of experiment research, the final 10 kHz in repetition frequency, the pulse width of 8.58 ns of the vertical polarization electric light diffraction tuning Q laser output, maximum peak power of 1486 W, the highest average power of 3.6 W.
Austenite Grain Ultra-refinement of 42CrMo Steel Induced by Electropulsing Treatment
Authors: Zhang Jiatao
Published: August 2019

With the increasing demands for steel products with both higher strength and toughness to meet the requirements for weight reduction and security promotion, steels with fine grained microstructures cannot meet the application demands any more, and should be further strengthened without toughness or other property loss, such as fatigue lifetime. Ultragrain refinement is a promising way to strengthen steels without toughness loss. For steels with the final bainite, martensite or tempered martensite structures, microstructure refinement basically depends on the prior austenite grain size reduction. In this study, electropulsing treatment (EPT) was used to refine the austenite grain, because pulse current shows remarkable influence on microstructure of metallic material. Results in this study confirm that the prior austenite grains (PAGs) can be ultra-refined by pulse current. When the steel was quenched from peak temperature less than about 850°C during EPT, the average PAGs size was less than 5μm. With the increasing of peak temperature during EPT, the PAGs became coarsening. But the PAGs in samples quenched from peak temperatures less than 1000° were still finer than that quenched from recommend 850° during conventional heat treatment (CHT). EPT induced grain refinement is related to the thermal effect and athermal effect of high density pulse current. The thermal effect results in high heating rate as high as 7700°C/s. In order to analysis the influences of rapid heating effect and athermal effect of pulse current itself on the grain refinement, J Mat Pro software was used to calculated the PAGs size at the same heating rate as that during EPT, which represented the nucleation rate and grain size only under the influence of thermal effect related to rapid heating. However, the simulated result shown the PAGs cannot be ultra-refined during simplex rapid heating. This reveals that the athermal effect of high density electric current itself plays a key role in the EPT induced austenite grain ultra-refinement.
Research on Preparation Method and Mechanism of Cylinder Ultra-fine Crystal Metal Spinning
Authors: Yang Yu , Jia Yanyan
Published: August 2019

Modern industry requires metal materials with high forming quality and excellent mechanical properties. Ultra-fine grain metal makes ordinary steel obtain good comprehensive performance, reduce the consumption of high-performance metal, improve material utilization and performance, and is of great significance to the manufacturing industry. In this paper, the body-shaped cubic metal 20# steel cylinder parts are taken as research objects. By exploring the forming principle of ultra-fine crystal structure cylindrical parts, the finite element simulation of the strong spinning process of the cylindrical parts is carried out. And the forming process experiment of ultra-fine grain structure spinning and heat treatment experiment are also carried out. Thus, the plastic deformation mechanism is revealed, and a method for preparing an ultra-fine grain material based on combination of strong spinning and recrystallization annealing is proposed. The research reveals the relationship between mechanical properties and microstructure of ultra-fine grained materials. The research results have great scientific significance for promoting the development of ultra-fine grain metal material preparation technology.
Hot corrosion behavior of Yb2Si2O7 ceramic by NaVO3 and V2O5 at 700° to 900°
Authors: Zhang Yongqiu , Sun Daqian , Ren Zhenan , Zou Binglin
Published: August 2019

To better understand the hot corrosion behavior of Yb2Si2O7 ceramic in molten NaVO3 and V2O5, corrosion experiments were performed using sintered Yb2Si2O7 bulk ceramics with NaVO3 and V2O5 coatings at temperature range of 700 Ό to 900 °C in air. Corrosion products of YbVO4 and SiO2 were identified under NaVO3 corrosion. But only YbVO4 was found under V2O5 corrosion with some residual corrosion agent. In above two conditions, the corrosion products of YbVO4 have the same crystallographic structural characteristic, but morphology has significant difference. In the first case, YbVO4 is rod-like with a tetrahedral cone at each end because of NaVO3 being weak acid to lead to lower driving force for the corrosion reactions. Thus corrosion products of YbVO4 grew with less nuclei and large elongation. However, V2O5 showed strong acid with strong driving force bringing higher nucleation rate and suppressing the growth of YbVO4, which resulted in granular YbVO4. And the size of granular YbVO4 crystals increased slightly with test temperature rising.
Research on absorbing performance of activated carbon
Authors: Yu Zhang
Published: August 2019

The absorbing properties of activated carbon were studied and tested by making use of RCS in “the reflectivity testing measurement of radar absorbing material” of GJB 2038-94 in this work. The effect of electromagnetic parameters and thinness on absorbing properties of materials was discussed. The results indicate that in the whole 12∼18 GHz frequency band, the dielectric constant decreases with increasing frequency, the dielectric loss angle tangent with the frequency gradually increased, and the activated carbon is a kind of anti magnetic media, but it also has some paramagnetic. The sample thickness has little effect on the wave absorbing property in the 12∼18GHz frequency band;
Experimental techniques used in topological insulators and realization of quantum spin Hall effect
Authors: Zhang Yichen
Published: August 2019

With the theoretical development and prediction of various topological insulators in two and three dimensions, experimental realization of those topological states and engineering of their characteristics have been hotly pursued, among which the quantum spin Hall effect exhibited in two-dimensional topological insulators have raised lots of concern. This paper aims to firstly give a brief introduction to experimental techniques used in growing and characterizing topological insulators and then we focus on a specific direction, the realization of quantum spin Hall effect, to elucidate one ramification of the experimental progress in the realm of topological insulator. The quantum spin Hall effect distinguishes itself due to its lack of non-magnetic scattering preserved by time reversal symmetry in its edge channels. Thus, materials showing such phenomenon are significantly promising for achieving dissipationless spintronics.
Study on properties of aluminum alloy welded by friction stir welding
Authors: Luo Chuanhong , Zhang Jianqiang , Wen Jungang
Published: August 2019

In order to meet the special requirements of aerospace industry for materials of aluminum alloy, the precisely controlled heat treatment was studied. The 2219 aluminum alloy welded plate was prepared by friction stir welding, and its microstructure and mechanical properties were studied correspondingly. The reasons for strength reduction of welded joints are analyzed and summarized. The research results showed that the average tensile strength of the welded joints increased to 393 Mpa and the elongation increased to 12.6% of the base metal. With the special recrystallization technology of high temperature oscillation heat treatment, the fine grains can be maintained, the plasticity of aluminum alloy can be restored, which means that the softening problem can be eliminated and the mechanical strength can be improved.