bluuebunny/crossref_metadata_2025 huggingface dataset:
Spatial Technology Based Participatory Digital Database for Village Potentials
Authors: Nurdin N , Inaku D F , Rasyid A R , Agus  , Akbar AS M. , Al Azizi S Q , Alimuddin A , Jalil A R
Published: May 2021

Geodatabase or digital spatial database is one of the GIS applications with an integrated database that has become a data source center that can be accessed for information and analysis needs by various existing applications. Participatory digital database has the potency to be used for inventorizing and collecting a complete, comprehensive, and detailed village/sub-district potentials spatial data. This research aims to provide knowledge as well as skills to the community, especially sub-district officials about a standardized spatial-based digital database of village potentials. The study took place in Langnga village, Mattiro Sompe District, Pinrang Regency, South Sulawesi, Indonesia. Methods used in this research are UAV Data Processing, Geodatabase System Compilation, Census and Cadastre Surveys, and Integration of Non-Spatial Data with Spatial Data. By compiling village potentials geodatabases, we constructed a Langnga village’s potentials map which can be used as a reference for planning and development of the village.
Empowering Fish-Farmer through Coastal Field School: Towards Sustainable Aquaculture Practice
Authors: Qurani I Z , Fawzi N I , Fadilah R , Kismorodati W
Published: May 2021

Central Java Province is among the largest aquaculture producers in Indonesia. This hefty contribution also comes with a challenge of degraded coastal areas primarily due to mangrove conversion into ponds, land subsidence, and raising sea surface. In Demak Regency, abrasion and robs flood have adversely affected the farmers’ aquaculture ponds since the past decades. The changing coastal environment and lack of knowledge to adapt in aquaculture management led to declining production that hampered the community’s resilience in the future. To help the farmers to thrive, an initiative called Coastal Field School (CFS) was implemented in 10 villages in Demak. Principally, CFS is a participatory learning method that emphasizes problem solving and discovery based on learning toward their production systems. The entire CFS program took place in 2015 – 2020, however this study only focused on the CFS conducted in Bedono village during May 2019 – September 2019. This paper discusses the CFS impact on the farmers’ knowledge change using the indicators of farmers’ program participation level, pre-test and post-test result to determine the knowledge improvement, aquaculture management technique, and productivity rate. The test was analyzed using a paired t-test where the knowledge level of farmers increased significantly (p < 0.001). The farming productivity rate also improved by nearly 30%. It is concluded that CFS can strengthen the farmers’ resilience in the degraded coastal area in Demak.
The distribution of Corbicula fluminea (Muller, 1774) and its outer shell colour in Sabah and Sarawak
Authors: Aweng E R , Arham Muchtar A B , Salam M A , Sharifah Aisyah S O , Azlan A , Zulhazman H , Mohammad Amizi A , Zul Ariff A L
Published: May 2021

Corbicula fluminea is one of the freshwater bivalves, which is small in size and lives in the river or at the bottom of the lake all over Malaysia including Sabah and Sarawak. Corbicula fluminea comes in different outer shell colour for different sites. The differences in outer shell colour are believed to be due to substrates composition, and land uses. Thus, to determine the distribution of Corbicula fluminea in Sabah and Sarawak and to determine the influence of river substrates and land uses on the outer shell colour of Corbicula fluminea, a survey was conducted in the selected area involving Sabah and Sarawak. The method utilized was by obtaining information from the villagers through informal conversational interview, observations, and followed by collecting the samples at the river using a special tool. The coordinate of each place where the sample was taken was recorded using the Garmin model GPSmap 62. Meanwhile, the digital calliper was used to measure shell height (H) and length (L). Statistical analysis of the chi-square test has been used to determine the relationship between the considered categorical variables in this study. Results indicate that the state of Sarawak has an irrigation canal that provides irrigation to the paddy field and one river, namely Sarawak Kanan River, which contains C. fluminea. As for Sabah, C. fluminea was found in 2 irrigation canals that also provide irrigation to paddy fields and 2 rivers, namely Tempasok River in Kota Belud and Kinarut River in Papar. Meanwhile, from the chi-square test result clearly shows that the outer shell colour of the C. fluminea depends on the type of substrate and landuse but not influenced by the location neither by zone nor the area such as urban, suburban or rural at the significant level of 0.05. This data is expected to be used by the authorities responsible for finding the conservation and restoration methods to ensure that C. fluminea does not disappear from the state of Sabah and Sarawak. This study could also help to ensure that the source of income for traditional fishermen who depend on C. fluminea is not affected.
Organic content and the number of Corbicula fluminea (Muller, 1774) in Lubok Tani Irrigation Canal, Tumpat, Kelantan
Authors: Rak A E , Omar S A S , Ibrahim M Z , Samae S H
Published: May 2021

Corbicula fluminea can be found living in the bottom of lakes, rivers and irrigation canal in Kelantan. C. fluminea usually receives nutrients and food source that are carried along with the runoff and these nutrients are considered pollutants to the water. Plus, the number of C. fluminea present is believed to be influenced by organic content in the sediment. Hence, the objective of this study was to determine the concentration of organic matter in the sediment and the number of C. fluminea at Lubok Tani Irrigation Canal, Tumpat, Kelantan. Samples were collected from two points, with six composites sampling of sediment and six samples of C. fluminea. Thus, organic matter in sediment was measured using Loss on Ignition analysis. The results indicated that an average of 55 clams was collected at the left bank, 57 clams at the middle and right bank. The average organic matter at the left bank was recorded at 1.61%, centre at 1.37%, and right bank at 2.42%. The results showed that area with higher organic matter had higher composition and size of C. fluminae. This study also showed that C.fluminae in the study area started to reproduce in May and believed to be matured in August. However, more data collection is required to obtain a significant statistical correlation. In conclusion, organic matter in substrates can influence the composition and size of C. fluminae and the suitable harvest time can be scheduled to ensure the sustainable harvesting.
Meat and meat-based products: Challenges and opportunities in halal food security
Authors: Ruzulan Z , Jamaludin M A , Ishak A H
Published: May 2021

The demand for halal meat and meat-based products among the Muslim population in Malaysia has been increasing as meat is an essential food. Meanwhile, the non-Muslims are also becoming aware of the quality of halal meat, hence the access towards halal meat and meat-based products are increasing as well. However, the local production of halal meat is insufficient to cater the demand and this leads to the dependency on imported meat to ensure that halal meat is made available and accessible to the society in Malaysia. This paper discusses the challenges and opportunities of halal meat and meat-based products for the sustainability of the halal food security in Malaysia. Document searching technique based on the available literature was used to fulfil the objectives of the study. The study found that the complex halal meat chain with several government agencies concerning halal matters lead to the inefficient treatment of maintaining the halal integrity. For this reason, focusing on the viable opportunities to increase the local meat production is significant in ensuring that the supply of meat is sufficient and halalan tayyibban.
Relation subsidence and water level of peatland cultivated with oil palm in Riau, Indonesia
Authors: Wasilul Lutfi M , Baskoro D P T , Anwar S , Pulunggono H B
Published: May 2021

This study was aimed to determine the relation changes in the subsidence and the depth of water level of peatlands cultivated with oil palm. The research site is the oil palm plantations in Koto Village, Gasib District, Siak Regency, Riau, Sumatera. The observations were in 4 blocks, namely block L1 (shrubs), Block D1 (oil palm aged 15 years), D8 (oil palm aged 10 years), and D31 (oil palm aged 20 years). Research parameters include peat subsidence and groundwater level. The results showed that the value of peat subsidence was fluctuative. This fluctuation was due to the rise and fall of the groundwater level. The highest rate of decline is shown in block L1 with 0.75 cm y−1 with SD 1.03 and the groundwater level in D1 with 52 cm. The water level is influenced by the condition of the monthly rainfall. The correlation between land subsidence and peat water level shows a close and significant relationship (p <0.01, r = 0.871).
Effect of different drying methods on the antioxidant properties of leaves of Centella asiatica
Authors: Abdul Rahim M S A , Baharudin N A , Ahmad Nazri I A , Mohamad S , Muazzam K A A R
Published: May 2021

Centella asiaticais one of the vital plant sources of antioxidants properties for consumption or medicinal purposes. This study aimed to determine the effect of three different drying methods (freeze drying, oven drying and dehydration drying) on the antioxidant of leaves ofC. asiatica. The antioxidant properties and IC50value of different concentration of methanolic extract solution (0.5 mg/ml, 0.25 mg/ml, 0.125 mg/ml and 0.062 mg/ml), were evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. The drying conditions and time required for freeze drying, oven drying and dehydration drying were -45°C for 3 days, 60°C for 5 hours and 35-43°C within 1-3 hours, respectively. Samples with lower IC50value showed a stronger antioxidant activity since low IC50 determine the efec. The freeze-dried ofC. asiaticasample at 0.05 mg/ml concentration exhibited the highest scavenging activity (93.97 ± 0.45%) with the lowest IC50value (0.05 mg/ml) whereas the lowest scavenging activity was shown by dehydration dried ofC. asiaticasample at 0.05 mg/ml concentration (55.08 ± 0.03%) with the highest IC50value (0.36 mg/ml). This indicates that as the concentration increases, the radical scavenging activity increases. Thus, it is highly recommended to use freeze drying as the method to conserve the maximum amount of antioxidant properties inC. asiaticaleaves.
Projected conservation of agricultural land to prevent detrimental effects of land-use changes upstream Brantas Watershed in Indonesia
Authors: Bushron R , Rachman L M , Baskoro D P T
Published: May 2021

This research aims to project the conservation of agricultural land due to land-use changes in 2029 in the upstream Brantas watershed, in avoiding agricultural land degradation to realize sustainable agriculture. This study applies the Cellular Automata (CA)-Markov combined model to quantitatively predict and spatially simulate the trend of land-use change in 2029. Analysis of total sediment and flow out uses Soil Water Assessment Tools (SWAT) analysis applied to land use in 2019, and land use in 2029 the CA-Markov prediction result. After that, a technical vegetative and civilian conservation projection model was carried out using SWAT. The results of the observation-model sediment validation resulted in a Nash-Sutcliffe Efficiency (NSE) value of 0.87. The projection results of agricultural land conservation in land-use in 2029 resulted in a total sediment value of 1500,483 tons/ha/year, indicating a decrease in total sediment of 55 % compared to the total sediment in 2029 without conservation, and and 8% compared to the total sediment in 2019.
Viability of bovine opu-derived oocytes to honeybee as cryoprotectant
Authors: Jie T C , Rahman M M , Pitchayapipatkul J , Mashitah S M , Nor Azlina A A , Raja Ili Airina R K
Published: May 2021

This study designs to determine the effectiveness of Honeybee (HB) as cryoprotectants (CP) on viability vitrified-thawed bovine oocytes derived from OPU using Trehalose as control. Cattles were subjected to superstimulation protocol, per session conducted five days where three days both cattle were administrated 100 mg follicle stimulation hormone (FSH) within 24 h once and two days of “resting period” totalling two sessions. The “coasting period” (FSH starvation) between sessions was four days (96 h). Oocytes collection via OPU were performed at fifth day (120 h). The ovarian growth was observed via ultrasonographic before OPU. Prior to vitrifying oocytes with treatment Trehalose (T1) and HB (T2) followed by warming protocol, oocytes subjected to in vitro maturation (IVM). Oocytes viability were evaluated by fluorescein diacetate staining. Results showed ovarian growth for first session was larger size follicles than the second session for both cattle. Total number of oocytes obtained were 60. Oocytes viability treatment T2 was significantly higher (90.9%) than T1 (70.4%). This study concludes that HB as CP in vitrification protocol was able to achieved high oocytes viability with oocytes derived via OPU suggesting Honeybee as an alternative CP for oocytes vitrification.
Effects of pickling steps on antioxidant activity of guava
Authors: Ramli N S , Mohamad Saadon N R
Published: May 2021

Pickling has been used for centuries to increase the shelf life of foods. Pickling of fruit involves several steps including washing and salting. This processing may affect the retention of antioxidant compounds. The consumption of antioxidant-rich fruits has been associated with reduce the risk of oxidative stress-related diseases. However, there is limited information available on the antioxidant activity of fruits during the pickling steps. Therefore, the study is conducted to determine the ascorbic acid content (AA), total phenolic content (TPC), total flavonoid content (TFC), and antioxidant properties using ferric reducing power (FRAP) and 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity (DPPH) assays during the pickling process (salting, washing, and pickling) of guava. The results showed that guava pickle showed a higher amount of TPC and TFC, but lower AA (p<0.05) in comparison to the fresh guava. There were no differences in the antioxidant activities of pickled and fresh guava. Similarly, salting and washing did not significantly change the AA, TPC, TFC, and antioxidant properties of the samples (p>0.05). Findings from the present study revealed that guava pickle could be a good source of antioxidant polyphenols. Further study is needed to identify the phenolic compounds responsible for antioxidant activity.
Storage stability of sweet corn (Zea mays var saccharata Bailey) jam: effect of sugar to inulin ratios on physicochemical, ascorbic acid, β-carotene and sensory characteristics
Authors: Zainol M K , Cheang L N , Zuraidah N , Yahya F , Zin Z M
Published: May 2021

This study aimed to investigate the effect of different concentrations of inulin on the properties of sweet corn jam from Zea mays var saccharata Bailey during storage. Six different formulations of sweet corn jam (4.5%, 9%, 13.5%, 18% and 22.5% inulin) along with control samples (0% inulin) were prepared. Physical properties including water activity, total soluble solids, pH, firmness, spreadability and colour analysis together with proximate analysis, ascorbic acid and β-carotene composition were evaluated in 4 weeks of storage. Sensory acceptability test of the samples on colour, spreadability, taste and overall acceptability was carried out. Results showed that addition of inulin in sweet corn jam significantly affecting (p<0.05) the water activity, L* value and texture quality. Inulin could be added up to 9 % without significantly affecting (p<0.05) the acceptance of colour and taste of sweet corn jam. Comparative study was done on control and 9 % of inulin added sweet corn jam. Sample with 9.0% of inulin gave significantly higher (p<0.05) moisture and ash content. However, samples with 9.0% of inulin gave significantly lower (p>0.05) carbohydrate and β-carotene content. This study shows that inulin is not only good as prebiotic but has the potential to replace sugar added into healthy food products such sweet corn jam, since it could improve the nutritional quality of sweet corn jam with satisfying sensory acceptance.
Form Finding Architectural Shading Device: Reinterpretation of Batik Pattern through Parametric Approach
Authors: Jati Esti Setyaning , Hariyadi Agus
Published: May 2021

The use of technology is a big opportunity to explore architectural design. This research examines the possibility of form-finding process by using computational design approach to generate shading devices that can represent local identity and provide efficient energy use of the building. Some examples of geometric Batik patterns found on the local screen used in one of the Indonesian traditional houses will be transformed into perforated shading devices. The process consists of three stages: understanding the symmetry group of each pattern with crystallographic chart analysis, generating a digital mesh of the objects by using photogrammetry method, and reinterpreting the object mesh to the perforated panel using parametric approach. The result shows that Banji pattern on p4gm symmetry group, while Kawung pattern on p4mm, Parang pattern on p1, and Nitik pattern on c2mm. On the photogrammetric stage, the digital three-dimensional meshes are successfully formed by using 13-19 overlapping photographs of the objects. From the last stage, perforated batik pattern panels are generated and it is possible to set the perforation percentage to reach desired WWR value. This experiment indicates that the use of computational design is possible to develop the local ornaments into a controllable perforated shading device.
Modeling Complexity of Urban Land use and Transportation In Semarang City
Authors: Widjonarko  , Maryono  , Fauzia
Published: May 2021

The development of urban areas will increase the travel demand of its population. Travel demand is often associated with the type of activity indicated by the type of land use. Travel demand can be predicted with developments in land use. The development of increasingly complex land uses will result in higher trip generation, so we need a model that can be used to estimate trip generation. The research objective is to understand the relationship between trip generation and travel attraction as a travel request with land use characteristics in the city of Semarang. The method used is spatial regression using variables Y (trip generation), X1 (housing area), X2 (trade area), X3 (industrial area), X4 (office area) and X5 (education area). All data uses spatial units in the kelurahan. Spatial regression results indicate that the movement in the city of Semarang is strongly influenced by housing activities, trade activities and offices. Industrial and educational activities make less significant contribution. The mathematical model of spatial regression of population movements in the city of Semarang can be denoted as follows Y = 626,41 + 28,69X1 + 0,06X2 + 5,49X3-18,84X4-10,71X5.
Urban Transformation in a Globalising World, Innovations and Local Leadership: The Case of Denpasar, Bali
Authors: Setiawan B. , Mutiarni Yosi S. , Fakhri Usa , Dewi Putu Sri R.
Published: May 2021

Located in the heart of the so-called ‘paradise island’ Bali, a medium-sized city, Denpasar is facing unprecedented transformation. As the capital city of Bali Province, which is the highest contributor for tourism sectors in Indonesia, it has experienced rapid economic and population growth. Coupled with pressures from global forces in the tourism industry, Denpasar could perceive both negative impacts as well as challenges due to the urban transformation. This paper concerns how a city deals with the unprecedented urban transformation and globalisation, a city in the developing world such as Denpasar can survive and achieve some progress. It aims to document and assess, in particular, local government’s innovations and leadership in ensuring the sustainability of the city. It is a descriptive and exploratory, based on field works, interviews, FGDs, and the available secondary data. This paper has successfully explored that Denpasar has launched many innovations to deal with current problems and to ensure its sustainability. Aside from that, it argues that innovations and local leadership are keys for the city to be able to respond to an unprecedented urban transformation and a changing world, as the answer for lacking the empirical experiences of local context for advancing urban sustainability.
Urban Form Factors that Play Important Roles on UHI Spatial-Temporal Pattern: A Case Study of East Surabaya, Indonesia
Authors: Syafitri Rivan A W D , Pamungkas A , Santoso E B
Published: May 2021

Urban Heat Island (UHI) has a negative effect on the local climate and ecological environment. On the other hand, urban form has an impact on the urban thermal environment. However, the relationship between UHI’s temporal spatial pattern and the urban form is still unclear. Our research explores the distribution patterns of UHI in East Surabaya based on surface temperature data calculations from Landsat imagery in 2001-2019 every 5 years. The results show that have been inconsistencies in the UHI pattern over the past 18 years and the most significant change occurred in 2016 and 2019. There is a difference in the intensity of UHI between built up area and non-built up area. Factors that are characteristic of urban form include urban green infrastructure, urban geometric and urban material with their respective variables. Using spatial regression OLS (Ordinary Least Square) variables that affect UHI include albedo type, sky view factor, building density, urban green space and urban water space. The mean building high variable has a negative correlation with UHI, this explains that the higher the building does not necessarily affect the increase in urban temperature. Our research can be a reference in formulating UHI adaptations.
Investigation on Accident Hotspot Area Using Social Media Data
Authors: Othman Shafuan , Halim Maisarah Abdul , Saraf Noraain Mohd , Salleh Siti Aekbal
Published: May 2021

Fatalities about road accidents become one of the main issues in this country. The precaution step should be taken to create a map of the accident area to create awareness among road users. The problem is data about the accident cases get by a local authority does not provide the specific location of the accident cases. It only shows the number of accident cases in every section in Shah Alam. To solve this problem, data from social media will be used to get the specific location of accident cases around Shah Alam. This research aims to investigate the capability to extract data from twitter for the use of analytic purposes. There are 2 objectives used which is first, to analyse data from social media among the road user about the accident road on the hotspot area for analytic purpose. The second is to produce a map of the accident hotspot area in Shah Alam by using Twitter data. Methods use is divided by two which is one method in terms of coding by using Rstudio and another method is using ArcGIS software. There are 4 analysis was used which is data extraction analysis, data mining analysis, data usage analysis and data achieving analysis were done to produce the 2 types of result which are the location of accident cases that contain specific coordinate and a map of accident hotspot area in Shah Alam. As a conclusion, the objective of the research is successful by producing the 2 types of result and at the same time, the aim of the research was achieved by showed data that extract from Twitter can be used in creating a map of accident hotspot which is one of analytic purpose.
Euler Pole Parameter Estimation of Sunda Plate from Present-Day GPS Site Velocities in Malaysia
Authors: Affandi Muhammad Luqman Ahmad , Aris Wan Anom Wan , Din Ami Hassan Md , Omar Abdullah Hisam
Published: May 2021

Malaysia is situated at Sunda plate that experience highly dynamic of earth’s crust with frequent earthquake and volcano activities. The effect of plate motion causing the static-based geodetic reference frame in Malaysia is no longer relevant to support the centimeter level of Global Positioning System (GPS) application. Therefore, an updated Sundaland plate motion model is necessary to cater to the effect thus preserving the reliability of the geodetic reference frame. This study aimed at determining regional plate motion of Sundaland in support of dynamic reference frame. The work involved in generating precise Position Errors Time Series (PETS) from GPS Continuous Operating Reference System (CORS) data in Malaysia and neighbouring country. The Coordinates Time Series (CTS) were then used to estimate velocity vector and the precision form the results depicted at -8.0429±3.0215mm, 3.873±3.288mm, and 0.913±7.775mm for component northing, easting and up, respectively. From the velocity vector, location of Euler pole of Sunda plate was found at latitude 5.8482 ° N and longitude -95.1017 ° E with estimated angular momentum of 0.201Ω/Myr± 0.0389. It can be expected that the result will be useful for maintaining the reliability of the reference frame in South East Malaysia.
Conventional Approach to Harmonious Coordinated Cadastral Database Weakness
Authors: Looi K S , Chan K L , Isahak M F , Hamzah H , Muda N , Lim B W , Yeap W C , Tan L C
Published: May 2021

The eKadaster system depended solely on the use of coordinated cadastral database known as the National Digital Cadastral Database (NDCDB) with an expected accuracy of ±10cm. Till date, there is an approximately of 7.8 million land parcels and 21.9 million boundary markers in the NDCDB that covers the total area of 132,183 km2. However, the NDCDB accuracy of ±10cm is still not at a satisfactory acceptance level and the adjustment keeps continuing without carrying out verification to the data sources weakness of varying accuracy and input errors. Thus, the foremost important corrective is to ensure the adjustment input files to have the exact value of the sources by further divided the existing adjustment blocks into smaller blocks to verify the input data line by line. A well distributed cadastral control points and latest NDCDB accessibility are also extensively needed to plan and to strengthen the adjustment network. The comparison result of the randomly picked ground truthing points in the field has shown a significant impact on the displacement accuracy that meet the expected tolerance of ±10cm or better after the data input file is cleaned without input error. And to further strengthen the adjustment network in order to make NDCDB accuracy better, the current cadastral control points shall need to tie to a highest accuracy fundamental network.
Research Status of Soil Organic Remediation - Visual Analysis of Literature Based on Web of Science Database
Authors: Yang Chenxi , Wang Jian
Published: May 2021

In order to understand the latest research progress, research trend and future research hotspot of remediation of soil organic pollutants at home and abroad, this paper uses the core database of web of science and its own literature analysis tools, vosviewer visual analysis software and origin, etc., and publishes the top 10 countries (regions) in the amount of papers and publications at different times, research institutions, research directions, journal sources and other types of published literature on remediation of soil organic pollutants were analyzed. The results showed that: with the growth of time, the number of publications increased gradually; China, the United States and Spain ranked in the top 3, among which China had 9 organizations in the top 10; the journal with the most publications was Chemosphere, while the journal with the most citations was water research, indicating that the remediation of soil organic pollution mostly drew lessons from the remediation of water organic pollution.
Research of Waste Sorting System Based on Convolutional Neural Network
Authors: Cheng Jingyi , Pang Qiang
Published: May 2021

As the civilization progresses, the issue of garbage classification is becoming of widespread concern for the global community. Traditional garbage classification has problems such as low efficiency, high cost and poor classification effect. In response to these problems, a new garbage classification system based on convolutional neural network algorithm is proposed. It combines software and hardware realizing the functions of identification, classification and unified management of garbage. Advantages, such as high efficiency, low cost, accuracy and stability, have been demonstrated.
Analysis of Meteorological Service Effect of a Low-cloud and Low-visibility Weather Process at Shanghai’s two Airports
Authors: Ma Li , Wei Xiaodong , Zhou Xiaoning
Published: May 2021

The emergence of low-cloud and low-visibility can affect air activities, and bring huge economic losses to airlines. Based on the aviation meteorological observation, forecast and airport alert of Pudong and Hongqiao airports, this paper analyses the meteorological service effect of a low-cloud and low-visibility weather process in Shanghai from January 27th to 28th, 2016. The results show that: (1) The absolute error between forecast and actual situation of Pudong and Hongqiao airport presents an obvious normal distribution and the forecast accuracy of Pudong is higher than that of Hongqiao. (2) For the airport with cloud ceiling of 30m∼60m and prevailing visibility of 600m∼800m, the alert of Pudong airport is more accurate and advanced, but for the airport with cloud height of less than 30m and prevailing visibility of 400m∼600m, the airport alert is quite different from the actual situation, and lacks lead time. (3) The alert of Hongqiao airport is accurate for the airport with visibility less than 800m from 03:30 to 10:30 on 28th, and the lead time is relatively high. However, it lacks the lead time for the airport with prevailing visibility greater than 1000m at 11:00 on 28th.
Study on Fenton Repair Technology of Soil Organic Pollution
Authors: Luo Yuhu , Sun Pei
Published: May 2021

Fenton oxidation technology has a good effect in the repair of soil organic pollution. The article emphatically introduced the working principle and research status of Fenton technology to remediate soil organic pollution, and made a prospect for the development of Fenton technology.
Hydrothermal synthesis of Cu-doped ZnS for enhanced photocatalytic degradation of tetracycline under the visible light
Authors: Li Shangzhewen
Published: May 2021

Undoped and Cu-doped ZnS were sucessfully synthesized by hydrothermal method. X-ray diffraction, Fourier transform infrared spectrometer, scanning electron microscope, transmission electron microscopy and UV-vis spectrophotometer were used to characterize the synthesized products. Characterization results indicated that Cu has been successfully doped into ZnS, and the doped material was smaller and had looser surface. In addition, the band gap was decreased from 3.50 eV to 2.27 eV through doping of Cu. Photocatalytic degradation of tetracycline confirmed the superiority of Cu-doped ZnS compared with ZnS, and the electron paramagnetic resonance and quenching experiment were used to investigate the photocatalytic mechanism, ·OH was regarded as the dominant species for tetracycline oxidation degradation. The effects of tetracycline concentration and catalyst dosage were further studied. Also, the good stability of Cu-doped ZnS was demonstrated via the 5-cycle test.
The Effective Application of the Sustainable Development Concept in Construction Engineering - Case Study of the Construction Work of Modern Art Design Teaching and Training Centre by Shanghai Art & Design Academy
Authors: Liu Zhen
Published: May 2021

Manpower, machine, material, law, and environment are the five driving fact ors in a construction project; the joint workforce of real estate owners, project supervis ion, construction management, engineering design and other staff in the process of pro ject implementation imposes itself with a significant characteristics of looseness, due t o different units having their own interest demands. As an organizer, how to lead this “ talent-intensive” but loose technical team and promote their proactiveness; how to com plete the project under the premise of low consumption, high quality and high efficienc y, while the individual interests are also met remains a challenge. Therefore, on top of a comprehensive organizational structure, an effective construction management syste m and a strict quality supervision system/measures, team building and the psychologic al satisfaction of the needs of the staff remain key to the achievement of goals. In the p rocess of construction projects, to improve technology efficiency and meet the concept of sustainable development, green construction technology should be enhanced in app lications. On the premise of meeting the requirements of the project, it is essential to e nhance sustainability of the construction work, avoid excessive consumption of materi als, reduce construction costs, and to minimize the impact on the surrounding environ ment. The utilization of green construction technology can effectively achieve environ mental benefits, avoid excessive interference, and eventually improves the effectivenes s and environmental management level of the construction project.
Analysis on the quality system and effect of Environmental Hygiene Surveillance in the Prevention and Control of Infectious Diseases
Authors: Fu Aoran , Zhang Yihang , Zhang Jimin
Published: May 2021

Whether the nature and task of the actual work of environmental sanitation in our country should be changed or adjusted, at present, the coexistence of environmental vehicle science and environmental medicine in our country, how to treat the situation of the coexistence of environmental health work and environmental protection work and how to deal with it correctly in order to facilitate further development and so on. In essence, these problems are the development direction of environmental hygiene and environmental health work in our country. To study the role of public health surveillance in current disease prevention and control. Analyze the literature to clarify the concept, content and specific role of public health surveillance. The main contents of environmental health monitoring are the prevention of sudden accidents, long-term environmental pollution and the detection of environmental hygiene. Through the effective prevention and evaluation of human disease and health, the normal life and health of residents can be guaranteed. Through the development of effective solutions, we can play the role of public health surveillance and improve the effect of disease prevention and control.
Instance Segmentation of Traffic Scene Based on YOLACT
Authors: Li Xingxing , Duan Chao , Zhi Yan , Yin Panpan , Wang Ningxing
Published: May 2021

As deep learning shines in the field of machine vision, this article uses the YOLACT instance segmentation algorithm to solve the detection and segmentation of pedestrians, vehicles and other objects in traffic scenes. In this paper, the backbone in the YOLACT algorithm is changed from the original resnet50 to the lightweight resnet18 to ensure that the algorithm can be deployed on Jetson-AGX-Xavier, and the processing speed can reach 9.4 frames per second, and the map can reach 81%. In NVIDIA 2070 super, the inference speed on the graphics card can reach 40 frames per second.
Landslide risk assessment based on combination weighting-improved TOPSIS
Authors: Yu Dejie , Lv Lansong , Meng Fanqi , Gao Feng , He Jing , Zhang Lixia , Li Yufei
Published: May 2021

Landslide risk assessment is of great significance to landslide disaster monitoring and prevention. A landslide hazard evaluation method based on combination weighting and improved TOPSIS method is proposed. TOPSIS based on grey correlation degree is applied to landslide hazard evaluation, and a new closeness degree is constructed to evaluate landslide hazard level. The subjective and objective weights of evaluation indexes are obtained by G1 method and entropy weight method, which improves the accuracy of TOPSIS evaluation results. The case analysis shows that the method has high accuracy, certain rationality and effectiveness, and can provide a reference for landslide disaster prevention.
Distribution characteristics of movable fluid in tight sandstone based on nuclear magnetic resonance
Authors: Yang Chunlong , Xie Zengye , Li Jian , Zheng Yue , Wang Xiaobo , Guo Jianying , Yang Chunxia , Liu Zhixin , Zhang Lu
Published: May 2021

Movable fluid parameter is an important index to evaluate the seepage characteristics of tight sandstone reservoir. Combined with high-pressure displacement and nuclear magnetic resonance movable fluid testing principle, the nuclear magnetic resonance movable fluid characteristics of six typical tight sandstone core samples of Xujiahe Formation in Central Sichuan Basin were studied. Based on mercury injection capillary pressure curve, the nuclear magnetic resonance T2 spectrum distribution was converted into pore throat According to the radius distribution, the minimum pore throat radius of the movable fluid and the contribution of different pore sizes to the movable fluid are determined. The research shows that the movable fluid saturation of the tight sandstone reservoir in the second member of Xujiahe Formation in Central Sichuan is closely related to the pressure difference, with good logarithmic correlation, and the main contribution to the movable fluid saturation is the reservoir space > 0.1 μm. 70% of the total movable fluid saturation is injected at a lower pressure (about 5MPa). In the later stage, high pressure injection can only enter the reservoir pore with small pore size, and the total amount is small and increases slowly. Therefore, the total contribution of high pressure drive to gas saturation in the later stage is small.
Dynamic Mechanical Properties of Basalt Fibre Reinforced Foam Concrete at High Strain Rates
Authors: Wang Jingwen , Wang Wei , Liu Chao , Zhao Jiayi
Published: May 2021

Dynamic compressive properties of basalt fibre reinforced foam concrete (BFFC) under different strain rates (from 0 to 2000/s) were investigated. Series of experiments were conducted on BFFC (900, 1100 and 1300 kg/m3) with 0.2% volume fraction fibre content respectively. Split Hopkinson pressure bar (SHPB) system was utilized to measure the dynamic response of BFFC. Mechanical properties including stress strain characteristics, strain rate sensitivity and peak strength of BFFC were discussed. The results show that BFFC reveal strain-hardening phenomenon and strain rate sensitivity under high strain rates, the peak compressive strength was significantly improved with the increase of density.
Study on construction technology of hydraulic climbing formwork for super high-rise building under aluminum formwork system
Authors: Li Shimin , Yu Ziqiang , Meng Zhaohu , Han Guangzhao , Huang Fajing , Zhang Dafa , Zhang Yunlong , Zhu Wenbo , Wei Dun
Published: May 2021

The requirements for construction technology of super high-rise buildings are always at a relatively high level. With the rapid development of our society and the continuous improvement of scientific and technological strength, in recent years, the aluminum formwork construction technology and hydraulic climbing formwork construction technology in high-rise buildings and super-high-rise buildings have developed rapidly, and have been widely used in actual construction. The super high-rise building of this project adopts aluminum formwork+hydraulic climbing formwork system for core tube construction. This paper analyzes and studies the cooperation and application of hydraulic climbing formwork construction technology in core tube under aluminum formwork system, the safety of frame body and the treatment of special parts for readers’ reference.
Blockchain-based IoT Consensus Mechanism System
Authors: Wu Yue , Song Liangtu , Liu Lei , Zhou Linli
Published: May 2021

With the continuous development of the Internet of Things (IoT), the application of blockchain technology to the Internet of Things has become a trend of the times. As we all know, the core of the blockchain lies in the consensus mechanism. In order to apply the blockchain to the Internet of Things, and for subsequent research needs, this research proposes a lightweight, high-throughput consensus mechanism system. Using scalable technology, any number of nodes and gateways can be set up. The experimental results show that the system throughput increases synchronously with the increase of the test load; in addition, when the test load is 800tps, the system throughput reaches the maximum value, which is close to 600tps. When the test load exceeds 800tps, the actual system throughput begins to drop, and about 90% of transactions have a delay time of 5000ms. This blockchain consensus system can be used for the simulation of lightweight IoT systems.
Research and optimal design of an energy efficient axial fan
Authors: Song Zhiwei
Published: May 2021

Ventilator, as a fluid machine, is widely used in many areas of national life, he has high efficiency, high flow, small volume and low pressure, etc., in daily life, mining and metallurgical industry and other fields have a wide range of applications. In this regard, efficiency and noise are two important indicators of fans, so for the existing fans, there is a need for a design that optimises the efficiency and noise of axial flow fans.
Research on Key Processes of Plastic Stamping and Forming Machinery Manufacturing Based on CAD Technology
Authors: Jin Dunshui
Published: May 2021

The paper adopts the parametric modeling technology of SolidWorks software, introduces CAE-driven design ideas in the stamping process, and realizes the parametric association and process of the blank grid and the tool grid based on the parametric tool grid model of the triangular face The parametric correlation between the parameters and the parametric correlation between the design model and the analysis model ensure that the product design, process design and forming simulation model are updated simultaneously, and the parametric CAE analysis and the true seamless integration of CAD/CAE are realized. By establishing a unified design and simulation model, the system avoids surface loss and accuracy loss caused by model data exchange between traditional CAE software and CAD platform. Through the parametric application of the forming simulation of the automobile bumper produced by an enterprise, and the comparison between the simulation results and the experimental results, the practicability and accuracy of the system are verified.
Research on Temperature Change of Reflow Furnace Based On Mathematical Modeling
Authors: Chen Hao
Published: May 2021

After referring to many documents, this article comprehensively considers various heat transfer methods, analyzes the heat transfer process of welded components, and establishes a temperature field distribution model based on one-dimensional transient heat transfer equation by ignoring some irrelevant conditions, and useing the finite difference method. We solve it and apply it to the optimization of furnace temperature curve. Due to the many types of reflow furnaces, this article mainly considers hot-air reflow furnaces. The heating methods are mainly heat convection and heat conduction, ignoring heat radiation. The welding area is established by the transient heat transfer equation. The temperature field distribution model is established, and the initial conditions and thermal boundary conditions are determined. Related heat transfer analysis is done for the front area, back area and gap areas. Finally, through the experimental data and the idea of least squares, the parameters of the electronic devices used in this experiment are obtained, and it also provides an idea to check whether the relevant parameters of the experimental materials are accurate. In order to make it easier for the staff to operate, this article proposes a method to find the maximum speed of conveyor belt, which has great practical significance.
Short-term Transmission Line load and State Evaluation method based on improved gradient lifting Stochastic Forest algorithm
Authors: Peng Xie , Yuanchuan Duan , Da Zhang
Published: May 2021

In order to accurately predict the short-term load change of power system and provide guidance for the safe, economical and efficient operation of power system, a power system load forecasting method which combines fuzzy clustering and random forest regression algorithm is proposed. the rough set is used to construct compensation rules to modify and compensate the prediction results. Based on the analysis of the factors affecting the state of overhead transmission lines, the state quantity system of overhead transmission lines containing 79 state variables is constructed based on the state variables selected by 8 units of the lines and the state quantities of special cases. In the random forest regression prediction, the same kind of data after clustering is used as the training set sample to construct the decision tree. Considering that the stochastic forest regression prediction is conservative and the power system load fluctuates greatly at the peak, the rough set theory is used to generate compensation rules to modify the load forecasting. Accurate state evaluation of overhead transmission lines in the power grid can effectively reduce the failure rate and improve the power supply performance of the system. Finally, an example is given to analyze the actual data of 66 kV voltage grade overhead transmission lines in a city. The results show that the accurate evaluation of the state of overhead transmission lines can be realized by using this method, so as to provide decision support for the operation and regulation of regional power grid.
Research and Discussion on Welding Mechanism of Reflow Furnace
Authors: Wang Youyou , Zhang Na , Yang Shichong
Published: May 2021

The flexible grasp of automatic welding technology is very important for the production of electronic products such as integrated circuit board, and the most critical step is to accurately control the temperature of the welding area. This paper will establish the mechanism model of the influence of the temperature of each temperature zone of the reflow furnace and the speed of the conveyor belt on the temperature of the welding area through the relevant thermodynamic theory, so as to help the relevant electronic product manufacturers to accurately control the temperature of the welding area. The mechanism model of temperature change in the center of welding area is established, and the heat transfer process is divided into three steps. Firstly, according to the temperature field of the air in the furnace, the air temperature corresponding to the gap in the small temperature zone is determined, and then the heat convection process between the air temperature in the furnace and the surface of the welding area is described by using Newton’s cooling law. Finally, Fourier law is used to study the heat conduction process in the welding area.