bluuebunny/crossref_metadata_2025 huggingface dataset:
Mitigation: Lessons Learnt from Botanical Gardens in Indonesia
Authors: Oot Hotimah , Iskandar Rudi , Husmiati Ratu
Published: December 2019

Construction of Botanical Garden (BG) in Indonesia is taking place rapidly. Construction of BG is listed in the second National Medium-Term Development Plan 2010-2014 which is stipulated through the Presidential Regulation No. 5 of 2010, as one of the 9th National Priority activities concerning Environment and Disaster Management. These provisions have positioned BG in an effort to rescue, study and use Indonesian plants as increasingly strategic. The target of Indonesian BG in 2020 is to be able to collect 75% of Indonesian plants. Botanical Garden not only have important roles in the fields of conservation, research, environmental education and tourism, but also made significant contributions to environmental services. The construction of BGs in various regions in Indonesia has an important role in assisting to realise the government’s commitment to reduce carbon emissions by 26%, conserving and utilising local potential flora, providing natural laboratories for research, education and tourism purposes, and supporting the implementation of green open space programmes. Based on the Presidential Regulation No. 93 of 2011 concerning BG, BG was stated as ex-situ plant conservation areas that played roles in reducing the rate of degradation of plant diversity, so that it was crucial to develop BG. Botanical garden must be built in a planned, coordinated manner and meet the standards of building of a BG. Management of BG involved the maintenance and utilisation of BG, plant collections and supporting infrastructures.[1] Botanical garden served to help reforest the city with various types of species as the lungs of cities that produced oxygen, prevented erosion, and drought, as well as educative recreational sites. Disaster mitigation associated with BG denotes that the construction of BG in various parts of Indonesia is an effort to reduce the risk of disasters such as floods, droughts, air pollution, and loss of diversity of germplasm, and public awareness in the face of disaster threats. Stakeholders involved in the construction of BG are Indonesia Institute of Sciences/LIPI, local government, schools, universities, and non-governmental organisations. Public awareness in facing the threat of disasters through BG could be done through developing and implementing an environmental education of BG.
AIM/End-use Model for Selecting of Low-Carbon Technology in Indonesia’s Iron and Steel Industry
Authors: Dewi R G , Zunita M , Sevie G N , Kurniawati F W
Published: December 2019

As an intensive energy-consuming, iron and steel making industry has significantly contributed to the national GHG emissions as the energy consumption is supplied by fossil fuels with high carbon emissions. The industry also releases GHG emissions during production processes, in which the emissions are considered as IPPU (industrial process and product use) category. There are still rooms for improvements in this industry, particularly those related to the efficiency improvement of energy use as well as material use or processes that could lead to the GHG emission reductions. Therefore, the iron and steel industry important roles to achieve the target of Indonesia’s NDC commitment in reducing GHG emissions and also towards the direction of low-carbon development and future climate resilience. In this study, a quantitative evaluation was conducted to analyse the effectiveness of emissions mitigation on potential energy saving and carbon emission reduction using the bottom-up AIM/End-use energy model in 2010-2050. This tool was used to select an optimal technology in detail with minimum cost approach. Several energy models have been proposed previously to quantify carbon emissions. However, a separate analysis of emissions from energy usage and IPPU (Industrial Process and Product Use) has never been done. The energy model was built under the baseline scenario and the following relevant mitigation scenario options were investigated: (i) adjusted the production structure, by increasing material efficiency with the scrap use in steel production process BF-BOF (Blast furnace-Basic oxygen furnaces) route and scrap-EAF (Electric arc furnace) route (CM1 scenario), (ii) maximised energy efficiency, by promoting low-carbon technology and non-blast furnace technology (smelting reduction) that is unimplemented early in modelling years in Indonesia will be included in the energy model for future reference (CM2 scenario), (iii) carbon emissions reduction through substitution of fossil fuels to low emission fuels (CM3 scenario). The expected results from the AIM/End-use model of Indonesia’s steel industry is to provide optimal mitigation options in terms of emission reductions and costs.
Projected extreme climate indices in the java island using cmip5 models
Authors: Putra I D G A , Rosid M S , Sopaheluwakan A , Ulina Y C , Harsa H , Permana D S , Cho J
Published: December 2019

Climate change has brought great environmental impacts that cause economic disruption as it causes extreme climate phenomena such as floods and droughts. The projection of precipitation and temperature is crucial to develop the adaptation and mitigation options, as well as to improve the operational strategies in various sectors. This study used Coupled Model Intercomparison Project Phase 5 (CMIP5) that consists of 29 GCMs to make the projection of precipitation and temperature (2011–2100), along with daily observational data from 16 stations over the Java island for 20 years (1986–2005) to evaluate the models. Spatial and temporal correlation method was used to evaluate the climate models and 5 GCMs with the best performance were selected to project the precipitation and temperature. A bias correction method called Simple Quantile Mapping (SQM) was used to adjust the climate models to better represent the observational data. Representative Concentration Pathway (RCP)4.5 dan RCP8.5 scenarios were chosen and the extreme weather events were depicted using the Expert Team for Climate Change Detection and Indices (ETCCDI), which includes annual total precipitation (Prcptot), consecutive dry days (CDD), consecutive wet days (CWD), monthly maximum temperature (TXx) and monthly minimum temperature (TNn). Using the multi model ensemble (MME) from the 5 best GCMs, the projection of 5 extreme climate indices over Java island shows a relative increase to the historical period.
Dragonfly Species Diversity (Odonata) in Three Telaga on The Highland Freshwater, West Java
Authors: Wibowo S S , Basukriadi A , Winarni N L
Published: December 2019

Odonata was very selective to the habitat selection. Their sensitivity toward environment makes them be good indicator species. Information of species diversity of Odonata in the highland of tropical freshwater lakes is still rare. The purpose of this research was to compare species diversity of Odonata in Telaga Biru Mount Gede Pangrango National Park, Telaga Warna, Nature Park, and Telaga Saat, West Java. Data of Odonata population were collected using fixed point count method. The results showed that species diversity of Odonata in Telaga Saat is higher than Telaga Warna, Nature Park and Telaga Biru, Mount Gede Pangrango National Park. Species diversity indices of Odonata in the three of lakes ranged between 0.78 – 1.75 and were categorized medium and low diversity. Jaccard index of similarity showed that Telaga Warna and Telaga Saat had the similar communities of Odonata. The high index of species diversity of Odonata in Telaga Saat was probably due to the higher intensity of light, which created the higher air temperature at the lake. Species richness, diversity and Shannon index of Odonata was the highest in Telaga Saat compared two other sites.
Population structure and conservation strategy of Rafflesia zollingeriana Koord. in Bandealit Resort, Meru Betiri National Park
Authors: Maezulpah N , Briliawan B D , Fairuz R , Iman D T , Pratama M , Ahsania D A , Nurhayati  , Saidah I , Nurhaeni W , Hidayati S N , Khoirunnisa E , Tyas A , Hikmat A
Published: December 2019

Rafflesia is a rare species that become an icon for Indonesia. However, data on population dynamics and distribution of Rafflesia are are still limited. This study aimed to analyze the distribution and population structure of Rafflesia zollingeriana and its present condition in Meru Betiri National Park (TNMB). The research carried out at the Bandealit Resort used a purposive sampling method in two sample plots of 100 m × 100 m with R. zollingeriana as the midpoint. A sub-plot of 2 m × 2 m established at the location where R. zollingeriana found in the sample plot. This study observed 88 and 102 individuals of R. zollingeriana in Sample plot-1 and Sample plot-2, respectively. Population structure of R. zollingeriana found distributed at clusters in all plots.
Species Composition and Stand Structure in sub-montane Forest of Mount Galunggung, Tasikmalaya, West Java
Authors: Fathia A A , Hilwan I , Kusmana C
Published: December 2019

Mount Galunggung is an active stratovolcano in Tasikmalaya, West Jawa, which shows the last major eruption in 1982-1983. This eruption caused the changes in forest vegetation, so this study aims to analyze species composition and stand structure in Mount Galunggung forest. This study conducted using a combination between transect and line plot methods. Based on the findings, there are 58 species of trees and its regeneration belonging to 24 families and 63 species of understorey belonging to 21 families. The highest species number of trees and its regeneration comes from Theaceae (7 species), Lauraceae (7 species), Moraceae (5 species), and Myrtaceae family (4 species). Furthermore, the highest species number of understorey comes from Urticaceae (4 species), Rubiaceae (3 species), and Orchidaceae (3 species) family. The species composition of trees and its regeneration dominated by pioneer species such as Homalanthus populneus, Ficus spp., and Schima wallichii, and climax species such as Castanopsis javanica, C. tungurrut, and Macropanax dispermum. Besides that, understorey dominated by Begonia robusta, Pilea melastomoides, and Athyrium sorgonense. Diameter distribution of the trees forming inversed J-curve that was dominated by 10-20 cm diameter class. Stratification of the trees canopy dominated by C stratum (4-20 m).
Assessing the potential of Gunung Dahu Research Forest as Source-Identified Seed Stand of Shorea leprosula Miq
Authors: Pratiwi A T D A , Pamoengkas P , Rachmat H H
Published: December 2019

Shorea leprosula Miq is a species from Dipterocarp family with high economic value but has complex problems in seeds availability and storage. S. leprosula stand in Gunung Dahu Research Forest (GDRF), Bogor-West Java has been flowering for several times that makes these stand to have potential to be developed as seed stand. This research was aimed to assess the potential of Gunung Dahu Research Forest as source-identified seed stand for S. leprosula. Assessment was carried outin plot number 1, 2, 5, 7 and 21A by developing a scoring technique to several criteria, those were: total amount of seed trees, stand’s quality, flowering and fruits quality, stand’s health, trees parentage, accessibility, and stand’s security. Only those of plots having 94 points or above would be accepted as seed stand and that designated plot number 2, 5, and 21A with total score 131; 131.5; and 96.5 points accepted as seed stands while plot number 1 and 7 were failed to fulfil the criteria. Among those of accepted plots, plot number 5 has higher potential as seed stand because it has fewer disturbances than plot number 2.
Growth Response of Kopsia (Kopsia arborea Blume) Plants to Applied Endophytic Fungi
Authors: Rasyad S M , Wulandari A S , Istikorini Y
Published: December 2019

The plant always associates with microbes for its life, includes the endophytes. Aim of this study is to examine the effect of endophytic fungi on Kopsia (Kopsia arborea) seed germination and seedling growth. Here, we used endophytic fungus from forest pathology laboratory, namely Phomopsis sp1, Phomopsis sp2, and Helminthosporium sp. All endophytic fungi were combined with liquid fertilizer to assess Kopsia seedling growth. The results showed that the Kopsia seed germinations, which treated with endophytic fungi have a higher value than the control. The endophytic fungi Phomopsis sp1 and Helminthosporium sp could increase the number of leaves without adding liquid fertilizer, while the Phomopsis sp2 needed liquid fertilizer for it. The NPA and the IMB values of the Kopsia seedlings are 0.71-1.71, and 0.18-0.33 strongly indicates the readiness of Kopsia seedlings to plant in the field, respectively.
Effectiveness of Soil Conditioner for the Growth of Acacia Seeds in Dystropepets
Authors: Wulandari R S , Suryantini R , Latifah S
Published: December 2019

Acacia mangium is one of the vegetation that can growth on dystropepts, but its growth has not shown the right quantity and quality. This is caused by the deficient nutrient in dystropepts. To increase productivity can add soil conditioners. The purpose of this research was to obtain an effective soil conditioner for acacia growth in dystropepts. This experimental research using complete randomized design. Factors studied were K = Control, A= Bacteria 10 gr, B = Trichoderma 10 gr, C = Mycorrhiza 40 gr, D = NPK fertilizer 20 gr, and E = Manure 200 gr. Dystropepts soil used as much as 1,000 gr for each treatment. Each treatment is repeated 5 (five) times. The observation variables consisted of height and number of leaves. The results showed that the treatment of adding conditioner significantly affected the growth of acacia seedlings in dystropepts. The addition of trichoderma is the best treatment for increasing seedling height (3.0) and number of leaves (7.4). Soil conditioners from microbes and fertilizers are effective for stimulating the growth of acacia seeds in dystropepts.
The potential of Curcuma longa, Curcuma xanthoriza and Centella asiatica in Silvofarmaka System Based on Melia azedarach and Azadirachta excelsa
Authors: Arif M A , Hartoyo A P P , Wijayanto N , Ananda R W , Naufal H
Published: December 2019

Silvofarmaka system is optimizing land management by combining forestry plants and medicinal plants. The purpose of this research is to study the potential of Turkey (C. longa), Curcuma (C. xanthorrhiza) and Pegagan (C. asiatica) under Mindi (M. azedarach) and Sentang (A. excelsa) in the silvofarmaka system. There are 60 seedlings for each species planted under Mindi and Sentang under 5 years, and there is no shade tree as a control. We measured the diameter and size of the Turmeric and Curcuma rhizomes, and the number of Pegagan leaves. The results showed that the average diameter of Turmeric (9.225 cm) and Curcuma (15.125 cm) under the shade of the tree was higher than under the shade of the tree. The difference in growth may be due to the intensity of sunlight. Turmeric, Curcuma, and Pegagan can grow in the shade of light. While the intensity of sunlight in this study is low, namely 304,536 lux (without the shade of a tree), 63.45 (under Mindi), and 47.72 (under Sentang). This lower intensity of sunlight causes lower biomass (diameter and leaves). The medicinal plants need more light intensity to grow optimally so that further activities (e.g. pruning and thinning) are needed..
Vegetative propagation of Dryobalanops sumatrensis and Dryobalanops oblongifolia subsp. oblongifolia by shoot cuttings
Authors: Siregar IZ , Kustiyarini NF , Wati R , Rachmat HH , Siregar UJ , Dwiyanti FG
Published: December 2019

The existence of Dryobalanops sumatrensis and D. oblongifolia subsp. oblongifolia in Indonesia’s natural forest is increasingly threatened due to land use changes and illegal logging leading to the urgent need of conservation actions in the field. Vegetative propagation by shoot cuttings has been proposed as an alternative method, yet there have been still lacks of information regarding the suitable rooting media and the use of shoots from saplings as cutting materials. This study was to evaluate the survival rate, rooting and shoot sprouting abilites of D. sumatrensis and D. oblongifolia subsp. oblongifolia on two different media (mineral soil and peat). Saplings of the D. sumatrensis aged older than 7 years old and D. oblongifolia subsp. oblongifolia aged less than 2 years old were used as cutting materials. The results showed that the survival rate of D. sumatrensis in peat (43.75%) and mineral soil media (43.75%) was lower than D. oblongifolia subsp. oblongifolia in for peat media (54.55%) and minerals soil media (71.88%). The rooting and shoot sprouting percentage of D. sumatrensis in peat and mineral soil media was also lower than D. oblongifolia subsp oblongifolia. This pattern revealed that the media treatment (peat and minerals) did not affect the survival rate and rooting ability of D. sumatrensis shoot cuttings, but has an effect on D. oblongifolia subsp. oblongifolia.
The Carrying Capacity of Ecosystem Services of Mangrove Angke Kapuk Area, Jakarta Bay
Authors: Sofian A , Kusmana C , Fauzi A , Rusdiana O
Published: December 2019

Mangrove ecosystems have an important role and provide ecosystem services that support the surrounding life, but their existence gets to experience pressure and degradation continuously. This study aims to analyze the ecosystem services carrying capacity of Angke Kapuk Mangrove (MAK) Jakarta Bay. The carrying capacity of the MAK ecosystem area was analyzed by examining the condition of ecosystem services and the carrying capacity of the protected function of the MAK and surrounding ecosystems. The condition of ecosystem services refers to the carrying capacity (D3TLH) map of the Muara Angke Kapuk mangrove ecosystem Area, Jakarta Bay, P3EJawa KLHK, while the carrying capacity of the protected function refers to the 2014 Ministry of Environment (KLH) D3TLH Guidelines and remote sensing and GIS techniques. MAK ecosystem areas are mostly in the low ecosystem services category. The results of the analysis show that the carrying capacity of the protected area of MAK ecosystem in Penjaringan District is 0.32, which means the carrying capacity of the protected function of the region is categorized damaged. These results provide an overview of the challenges and threats that occur in the MAK ecosystem area so that it requires attention and strategic efforts in maintaining the sustainability of ecosystem services.
Distribution of Mushrooms in the Resort Cikaniki at Mount Halimun Salak National Park
Authors: Hasibuan R S , Jenuarista S T
Published: December 2019

Mount Halimun Salak National Park (TNGHS) is one of the conservation areas in West Java. One of the areas in TNGHS is Cikaniki Resort which has various mushrooms. Mushroom is one of the potential biodiversity that has been developed for various purposes such as food, medicine and others. The purpose of this study was to determine the potential of mushroom and the distribution of mushroom in the cikaniki resort of Mount Halimun Salak National Park. The method was line transect. The results of this study were that there were 50 types of mushrooms, 35 mushrooms known to the name of the species and 15 unknown names of mushroom which distribution to an altitude of 1638 masl. Mushrooms were used as food producers such as, Agaricus bisporus, Auricularia polytricha, Agarics, Auricularia delicate, and Tramella fuciformis. Mushrooms were used as medicines such as Ganoderma applanatum, Laetiporus sp., And Phellinus linteus.
Paludiculture: can it be a trade-off between ecology and economic benefit on peatland restoration?
Authors: Tata Hesti Lestari
Published: December 2019

Restoration of degraded peatlands has been taken into serious action in Indonesia. Paludiculture, which is defined as a cultivation on wet and rewetted peatlands, has been promoted as a solution of peatland restoration. The drained peatland should be blocked and rewetted to increase water table and reduce emission. While planted suitable plants and trees on wet and rewetted peatlands which have economic benefit is challenging. We conducted review and synthesis based on published and unpublished papers resulted from activities of peatland restoration in Indonesia, to show whether paludiculture may provide a balance of both ecology and economic benefits. Results show that rewetted on degraded peatlands reduces green-house-gas emission. However, few tree options for wet and rewetted peatland restoration which provides economic benefit. Tree selection usually based on specific site, price and market. Peatland restoration is complexs, therefore the paradigm of peatland restoration should focus on socio-ecological restoration first. Economic benefit will come later as both tangible and intangible economic benefits. Economic friendly schemes, such as REDD+ and rewards for environmental services (RES) may be more suitable as a trade-off in peatland restoration.
The Growth of Kapur Tanduk (Dryobalanops lanceolata Burck.) on Different Levels of Canopy Opening and Fertilization
Authors: Mardhatillah R , Pamoengkas P , Darwo
Published: December 2019

Critical land rehabilitation efforts in the forests areas are important activities to be undertaken. Dipterocarpaceae is a potential species to be developed in the restoration of degraded forest areas, one of which is Kapur Tanduk (Dryobalanops lanceolata Burck.). This study aims to determine the influence of canopy opening factor, dose of manure, and environmental conditions (temperature, humidity, slope, and soil conditions) to the growth of D. lanceolata in research plots (KHDTK Haurbentes, West Java). The results showed that the different levels of canopy opening (71.34%, 37.91%) and the dose of manure (0, 2, 4 kg / planting hole) have no significant effect either single or interaction both to the increase in diameter and height of D. lanceolata. The Different levels of canopy opening in both areas resulted that different responses in the early days of growth, the degree of opening of 71.24% (open area) had a good response to the diameter growth while at the level of opening of 37.91% (under the shade) had high growth rate of plants. Thus, until the age of 6 months D. lanceolata has a good adaptability to the degree of canopy opening in between 37-72%. The environmental conditions in the research plots in KHDTK Haurbentes are suitable with the characteristics of the growing species so it can support the growth of D. lanceolata.
Diversity of Arbuscular Mycorrhizal Fungi as Affected by Time Consequences Revegetation Age in Post Coal Mine Area at PT Berau Coal Tbk, East Kalimantan Indonesia
Authors: Salim M A , Budi S W , Setyaningsih L , Iskandar  , Kirmi H
Published: December 2019

Arbuscular Mycorrhizal Fungi (AMF)is one of the fungi that can be found in almost every ecosystem including post-coal mining land. This study aims to analyze the diversity of AMF in different age of revegetation of post-coal mining land area. Soil samples were collected from six different age of revegetation of post-coal mining area (unrevegetated area, 0, 2, 4, 6 and 8 years) and from natural forest as comparison. AMF spore isolation was carried out using wet-sieving method, while spore identification was carried out based on several morphological characters according to INVAM guideline. The results of the observation showed that with increasing of revegetation age will be able to increase the number of AMF populations (R2= 84.96%). The highest AMF population was found at the age of 10 years after revegetation of land with the number of 492 spores per 20 grams soil, while the lowest AMF population was found in unrevegetated area with the number of 12 spores per 20 grams of soil. AMF genera found included Glomus, Acaulospora, Gigaspora, Scutellospora, and Dentiscutata. Glomus and Acaulospora were the dominant AMF in every land revegetation age (100% of frequency). AMF populations was correlated strongly with soil organic content (r = 0.79).
The analysis of the influence of delay absorbing sequence on flight delay propagation
Authors: Wang Yutong , Zhu Jinfu , Liu Chang
Published: December 2019

Due to the connection between the flights, flight delay will be spread to the downstream flights via the flight string. Therefore, we need to take some corresponding measures to mitigate flight delay propagation. Firstly, based on the sequences of flight delay absorption by buffer time, the paper analyzes the law of delay propagation among different nodes from three different perspectives. Then, based on the random forest algorithm, the factors affecting delay propagation are sorted by order of importance, and the key influencing factors of delay propagation are obtained. Finally, through a case study of an airline’s flight operation data, some measures to mitigate flight delays are proposed from the perspective of adjusting buffer time.
Evaluation Model of Urban-Rural Transportation Integration Development Level
Authors: Yin Huanhuan , Zhao Zhu , Song Huiying , Su Yuanying
Published: December 2019

Promoting the urban-rural transportation integration, promoting the extension of public transport facilities to the countryside and the coverage of public transport services to the countryside, are also important measures to promote the construction of new urbanization and achieve a well-off society in an all-round way. The research on the evaluation of the development level of urban-rural transport integration can help us to understand the development status of urban-rural transport integration more clearly, which can promote and guide the urban-rural transport system to achieve coordinated development. By establishing the evaluation index system of the development level of urban-rural transport integration, this paper puts forward the evaluation method of the development level of urban-rural transport integration, objectively and accurately evaluates the development level of urban-rural transport integration, and provides theoretical support and basis for effectively promoting the development of urban-rural transport integration.
Aircraft Departure Fuel Consumption Improvement Model Based On Flight Data
Authors: Huang Qianwen , Zhang Ming , Liu Sihan
Published: December 2019

Accurate assessment of aircraft fuel consumption is an important means for airlines to reduce flight costs and control fuel emissions. By analyzing the actual flight data of QAR, the functional relationship between the aerodynamic parameters in the fuel consumption model of the departure climb phase is fitted, and the crosswind is added to the fuel consumption assessment model. Based on the analysis of the departure training of Qingdao Airport, the fuel consumption model of the exit climbing stage was calculated using the improved fuel consumption model. The results showed that the calculation accuracy of the wind tunnel experiment was improved by 3.6%, and the theory of the fuel evaluation experiment considering the crosswind was considered. The accuracy of the model calculation and QAR data is 93.3%.
Aerodynamic Load Characteristics of High-Speed Train under Different Wind Load Models
Authors: Liu Rong , Yin Zhiqiang , Chen Guang
Published: December 2019

In order to study the difference of unsteady aerodynamic loads of high-speed train under different wind load models, considering the assumption of uniform wind and the random characteristics of wind, the turbulent velocity field is generated by CDRFG method. A numerical model of cross-wind aerodynamics for high-speed trains was established by using STAR-CCM+, and solved by the IDDES method. The time history curve of fluctuating wind was transported into the computational domain as a function to calculate the computational fluid dynamics directly. The variation law and difference of aerodynamic load of high-speed train under two kinds of wind load models are obtained. With the increase of yaw angle, the maximum, average and standard deviation of aerodynamic load coefficient increase, and the coefficient fluctuation becomes more intense. The aerodynamic performance of the head car is the worst among the three cars. The PSD of aerodynamic load under stochastic wind is higher than that under uniform wind. With the increase of yaw angle, the corresponding PSD difference of aerodynamic load between stochastic wind and uniform wind increases, which indicates that the effect of pulsation is more obvious.
Evaluation and research on site selection scheme of high-speed railway station based on binary semantic combination weighting method
Authors: Li Xilin , Chen Long
Published: December 2019

Aiming at the site selection problem of urban high-speed railway station, the objective weight and subjective weight of indexes were determined by two methods respectively. These two methods were the binary semantic entropy weight method and the binary semantic AHM method. Then according to the combination of weighting based on the principle of minimum overall distance, the evaluation model of high-speed railway station site selection scheme was established. Finally the classical TOPSIS method was used to solve the problem. Taking Lanzhouxi railway station as an example, this paper verifies the rationality and effectiveness of the evaluation method, and provides further reference for the evaluation and decision-making of high-speed railway station site selection in other cities.
Research on the application of new energy pure battery powered ships in the Yangtze River
Authors: Jiang Lei , Ji Yongbo , Yi Yalin , Li Kui
Published: December 2019

The Yangtze River, as the busiest inland river in the world, has implemented more stringent ship pollution prevention regulations in recent years. The new energy pure battery powered ship has the characteristics of “zero emission”, low vibration and low noise. Therefore, it has quickly become a hot spot for the green development of the Yangtze River inland shipping industry. This paper analyses the application of key technologies of new energy pure battery powered ships, and summarizes the technical standards, economic investment, management regulations and other issues faced in the actual promotion process, and puts forward related suggestions.
Research on visual analysis technology and application of urban road data
Authors: Shao Ziyi , Lin Zhang , Hao Wu
Published: December 2019

Many cities use the current wealth of multi-source data to create intelligent transportation systems, which visually process road data so that traffic consumers and traffic managers can better understand urban traffic conditions. Due to the heterogeneity, complexity and mass of these data, it is not easy to conduct effective analysis on them, and it is often necessary to integrate human perception in the analysis process, so as to cause extensive application of visualization. In this paper, we first briefly introduce the pre-processing of urban trajectory data, then systematically analyze the visualization of two data types of road traffic flow and traffic events, and finally briefly summarize the research trend of traffic visualization in recent years and put forward corresponding challenges. The results show that the early research focused on the visualization of road flow, including the main arrow diagram, Mosaic diagram, track wall, etc. With the deepening of visual analysis, the analysis of traffic flow increases to the analysis of traffic events. In recent years, there has been a new trend of mining and utilizing the attributes or semantics of traffic trajectories or traffic events. The research on traffic data visualization has been greatly expanded in breadth and depth.
Research on Urban Interconnection Index of Transportation Card Industry
Authors: Fang Qiushui , Li Zhiming , Wang Zhen , Wu Jincheng , Leng Mengtian
Published: December 2019

In order to intuitively reflect the operation situation and forecast the future trend of the traffic card industry, and enhance the data support ability for the service evaluation of the traffic card industry. Referring to the relevant research results, this paper combines the operating needs of the card companies and the construction principle of the index system, and constructs the service index system of the card industry based on the big data of the card industry, which can be used to monitor the operation situation of the card industry and the service status of the bus trip. It can also be applied to the industry supervision, business monitoring and users. Travel service. Then, taking the traffic card interconnection index as an example, this paper evaluates the status and causes of the provincial traffic card interconnection by using the data analysis platform of Guangdong Province’s traffic card, and puts forward the prospects for the construction of the comprehensive service index of the traffic card industry.
Establishment of Residual Value Assessment Model for Electric Vehicle Based on AHP
Authors: Cao Xin , Yang Weimin
Published: December 2019

With the rapid increase of sales of new energy vehicles in China, electric vehicles begin to enter the homes of ordinary people. Like traditional diesel locomotives, electric vehicles will also face the problems of residual value assessment and recycling in the life cycle of products. Based on the traditional evaluation of used vehicles of internal combustion engines, combined with the unique factors of electric vehicles, this paper analyzed the substantial devaluation, functional devaluation and economic devaluation of electric vehicles, systematically sorted out the influencing factors of residual value of electric vehicles, and constructed the calculation model of residual value of electric vehicles by reset cost method and AHP analytic hierarchy process. At present, the scale of electric vehicle has not been formed in our country, the state has not yet promulgated the relevant evaluation criteria for second-hand electric vehicle, and the second-hand electric vehicle has not formed a market. Therefore, the calculation model deduced in this paper can not be verified by the market for the time being, but it has certain reference significance for the evaluation of second-hand electric vehicle.
Performance Evaluation of a Hydrophobically Modified Anti-Slide and Anti-icing Coating
Authors: Shen Fan , Wei Guosu , Pang Ruonan , Liu Feiyi , Fang Sifa
Published: December 2019

Two-component oil-based polyurethane and two-component water-based polyurethane were used as main raw materials, and a hydrophobic modified anti-slip snow coating was prepared by adding a sodium chloride modified snow melting agent which was subjected to zeolite-diatomite slow release treatment. The performance of the coating was evaluated. The viscosity test showed that the viscosity of the coating was 4200 MPa, which ensured the fluidity of the coating. The contact angle test shows that the coating has a contact angle of 99.2° and belongs to a hydrophobic surface. The friction coefficient and texture depth tested shows that the material has a friction coefficient and depth of texture up to 81BPN and 72.5mm. The research results show that the coating has certain hydrophobic ability, can hinder the road surface freezing, and can release the snow melting agent for a long time, prolong the ice-suppressing effect of the coating, and has good anti-sliding ability, which can ensure the safety of driving in r ice and snow weather.
Research on Joint Optimization of Airport Surface Based on Improved A* Algorithm
Authors: Liu Jinxin , Feng Sixu , Zeng Xiaoyu
Published: December 2019

Joint optimization of runway and taxiway will help increase the usage rate of airport’s existing hardware and software resources and ease flight delays. Firstly, the paper considers the relevant regulations of taxiing and the constraints of runway release interval, and takes the shortest total taxi time of each flight as the objective function to construct a joint optimization model based on the basic element layout of the airport. Secondly, the A* algorithm is improved for its characteristics and the actual situation of the airport surface, and the optimization model is solved by this improved method. Finally, taking Nanjing Lukou International Airport as an example, the optimal solution obtained by improved A* algorithm is compared with the actual running data to verify the applicability of the model.
Research on a Method of Log Aggregation
Authors: Lai Xinming , Wang Haitao , Zhao Jing , Zhang Fan , Zhao Chao , Wu Gang
Published: December 2019

This paper proposed a log aggregation method in scale container platform. This method collects container log data from cluster nodes through system management tool and container governance tool, provides the indiscriminate collection service for different platforms, aggregates log data in time based on Storm stream processing to implement real-time performance, implement high performance and high availability of container log data aggregation under scale clusters based on Kafka as the aggregation queue of log data.
A new analytical framework for the location selection of shared car site
Authors: He Yonggui , Meng Wang , He Qi
Published: December 2019

Reasonable and effective sharing of vehicle location plans will be of great significance for improving the overall efficiency of shared vehicles and the allocation of urban transportation infrastructure resources. This paper predicts the demand for shared cars in Hangzhou by evaluating the ownership rate of shared cars, and estimates the maximum number of people that can be served at each level. Then, using K-means clustering method, the initial clustering center is selected according to the center of gravity method, and the clustering condition is formed by using the minimum distance from each vehicle demand point to the clustering center to form a clustering cluster. The number of service groups of the cluster is added, and the cluster center iteration is performed according to whether each cluster satisfies the number of service groups until the optimal number and location of the network points are obtained. Finally, according to the number of service persons, the construction scale of 12 selected outlets will be determined, and the plan for the location selection of shared car outlets in downtown Hangzhou will be obtained. The research results show that this method can provide an effective basis for the decision-making of shared car site selection.
Design of Acoustic Doppler Current Profiler Calibration System
Authors: Xie Hui , Liu Yicheng , Zhang Mingmin
Published: December 2019

In order to trace and transmit the velocity value of acoustic Doppler current profiler (ADCP), an ADCP velocity measurement method based on deep water channel and unmanned ship is proposed. An unmanned ship carrying ADCP moves at a uniform speed along the planned route. High-speed camera and total station are used as the main standard for time and length measurement. The average velocity of ADCP in the measurement section is measured as a reference value for velocity. Compared with ADCP velocity indication, the error of velocity indication is calculated. Real-time kinematic positioning technology (GPS-RTK) is used to map the trajectory and yaw error of unmanned ship and verify the instantaneous velocity stability. The test results show that, under the condition of unmanned ship setting speed of 1 m/s, the error of ADCP velocity indicated by inspection is -0.029 m/s, and the extended uncertainty of this test system is evaluated as U=0.071m/s, k=2.
A Practical Method of Modelling and Simulation for Ball End Mill CNC Grinding
Authors: Pei Qichao , Li Zhuyu , Cui Xuefei , Wang Hongyang , Zhang Wei
Published: December 2019

The spherical cutting edge on the ball end mill directly affects its cutting performance. This paper presents a practical method for end mill rake/clearance face modelling. The rake face is a developed ruled surface to fulfill the desired normal rake angle. Revolution surface of the bottom curve on the rake face avoids the interference between the wheel with the designed rake face while grinding. An equidistance curve of the cutting edge on the sphere is deduced by the geodesic curve in order to adjust the position of the cutting edge. With this new modelling method as a platform, it is very helpful for model modification and contour error compensation. The measurement results show that the average value of contour error on spherical cutting edge of the machined sample is 0.01mm inspected by the tool measuring instrument. Its validity is verified by good agreement between the results computed and the data measured.
Applications and prospects of titanium and its alloys in seawater desalination industry
Authors: Wang C P , Wang H Z , Ruan G L , Wang S H , Xiao Y X , Jiang L D
Published: December 2019

Seawater desalination (SD) is an effective method to solve the shortage of human water resources. Because of the excellent corrosion resistance of metallic materials in natural waters, as well as the best corrosion resistant, low density, high strength and good heat resistance in seawater, titanium and its alloys are considered the desirable marine material, including in SD equipment. This review introduces material characteristics of titanium and its alloys, and three currently most widely used commercial SD technologies: multiple effect desalination (MED), multi-stage flash (MSF) and reverse osmosis (RO). The applications and prospect of titanium and its alloys in SD industry are overviewed and analysed. This paper can be a reference for the future material selection of SD equipment.
A comprehensive study of three dimensional deviation analysis methods for aero-engine rotors assembly
Authors: Ding Siyi , Zheng Xiaohu , Bao Jinsong , Zhang Jie
Published: December 2019

Rotor assembly is a core tache in the whole process of aero-engine manufacturing. The assembly deviation analysis is an effective tool to control deviation propagation. For aero-engine rotors assembly, the traditional deviation control methods focus on the modeling of plane dimension chain and extremum analysis, which is difficult to comprehensively consider the rich geometrical errors and their relationship to each other; meanwhile, the precision prediction is too conservative to reduce the parts’ rework frequency and adjusting difficulty; In addition, traditional methods overemphasize the promotion of parts’ machining precision, and ignore the means of overall stack optimization. In recent years, three dimensional deviation analysis and control methods have a lot of developments. These methods synthetically consider the matters of size deviation, form and location deviation, fixing structure and the positioning relationship. The poor concentricity problem of gyro black assembly can be exactly described, which is beneficial to control assembly deviation. This paper deals with aero-engine rotors assembly problem from two perspectives: deviation expression and deviation propagation, gives the difficulties of this topic, and provides a detailed review on the most recent approaches about partial deviation expression and three dimensional chain propagation. Finally, a perspective overview of the future research about aero-engine rotors assembly is presented, such as rotors deformation, surface morphology representation and matching, and the relationship between assembly precision geometry and performance physical quantity.
Lithium insertion in Si electrodes studied by first principles method
Authors: Wu Ruiqi , Liu Fengbin , Lina Si , Zhao Nan , Yan Hongjuan , Chen Jianguo
Published: December 2019

Si has been considered as one of the most potential new-generation anode materials for high-capacity lithium-ion batteries. However, the lithiation and delithiation of lithium ions during the charge-discharge processes of the Si electrode would give rise to almost four-fold volume expansion, causing structural changes and cracks of the conductive network, limiting the application of Si-based anode material. In this paper, the lithium ions inserting into Si material at various positions and at different doping concentrations of lithium ions was studied by first-principles method. The stability of different insertion sites, the structural changes, band structures and density of States after Li insertion were analyzed. It has been found that the lithium ions doping is an interstitial doping rather than a substitutional one and the tetrahedral center (Td) site is the most stable insertion position. From the band structure analysis, it can be seen that the Si material with the insertion of lithium ions becomes metal-like, and as the concentration changes, silicon changes from an indirect gap semiconductor to a direct gap semiconductor. When the concentration reaches 12.5%, the structural expansion rate increases obviously. This work provides a strategy for the improvement of the Si based anode material used in high-capacity lithium-ion batteries.
Research Progress on Production Technology and Equipment of Fired Perforated Brick
Authors: Liu Hongmei , Zhang Jian , Wang Xingxing , Zhu Aidong , Ding Dawei , Ni Hongjun , Ai Wenbo
Published: December 2019

Fired perforated brick is a common material in modern construction industry. This paper introduced the production technology and equipment of fired perforated brick. Based on the research status of domestic and foreign scholars, technical difficulties and corresponding solutions of production process were analyzed and summarized. And the future of fired perforated bricks production equipment was discussed.
Microstructure of silver coating of cyanide-free brush plating based on multicomponent coordination system
Authors: Li Xinmei , Zhang Zhongwen , Suo Shuai , Qiao Yaxia , Du Baoshuai , Deng Hualing , Hao Zhang , Luo Hongjian
Published: December 2019

By using metallographic microscope, scanning electron microscope, X ray diffraction and other test methods, this paper studies the microstructure of brush silver coating prepared by multicomponent coordination systems, such as succinimide, 5,5-dimethyl hydantoin and mono potassium phosphate. The results show that the appearance of silver coating of cyanide free brush is silver white with uniform and even surface and the combination situation between silver coating and copper is great. The coating is the single silver particle structure whose arrangement is tight and size is small and even. It meets the requirements of microstructure of button contact used by high voltage switch and lays the theoretical basis for the development of electric brush plating repair technology of silver coating of button contact used by high voltage switch.
Interfacial stress of carbon fiber patch bonded to transverse cracked steel plate reinforcement
Authors: Fan Zhao , Zhang Xiangming , Wu Jing , Wang Anwen
Published: December 2019

A three-dimensional elastic-plastic finite element model was established in finite element software ANSYS to investigate the interfacial stress of carbon fiber patch bonded to transverse cracked steel plate reinforcement. The patch and adhesive were modeled as linear elastic. The steel plate was modeled as elastic-plastic. The load-deflection curve of the steel was obtained by bending test. The influence of crack depth, adhesive thickness, patch thickness and patch length on reinforcing efficiency was studied. The results show that the peel stress of the adhesive was distributed symmetrically along the center line, mainly concentrated on the crack center, near the crack and the patch ends. The peel stress at the crack center was always greater than the near crack. The shear stress is anti-symmetric along the center line, and the shear stress at the crack center is zero, mainly concentrated near the crack and plate end. The debonding may be initiated from the vicinity of the crack. Increasing the crack depth can significantly increase the peel stress and shear stress at the crack, but has little effect on the stresses at the end. Increasing the thickness of the adhesive can reduce the peel stress and shear stress at the crack center and near the crack, and the shear stress at the ends, but has little effect on the peel stress at the ends. Increasing the patch thickness can reduce the stress at the crack but increase the stress at the end. Increasing the patch length cannot reduce the stress at the crack, but significantly reduce the stress at the end.