bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Key Technologies of VR based on MEC
Authors: Jiang Yuhao 
Published: April 2021

Abstract
Multi access edge computing (MEC) is an extension of 5G network on the edge side. Its network characteristics of high bandwidth and low delay provide necessary guarantee for the extreme user experience of VR (virtual reality). At the same time, the distributed architecture of 5g MEC network and the fast data exchange capability between nodes provide the hardware foundation for VR application marginalization deployment and equipment mobility access. Considering the cost and experience of VR, this paper first analyzes the advantages and disadvantages of VR based on traditional hardware architecture, and then describes the benefits of MEC on VR cost and experience. Finally, taking VR live video scene as an example, the key technologies of VR based on MEC are described.
Research on Mathematical Methods of Improving Fama and French Three-factor Model Based on ETF Factors
Authors: Wu Yanqing , Mo Xiaochong , Wang Yuanxin , Gan Fuwen 
Published: April 2021

Abstract
Will ETF factors help to improve Fama and French 3 factor Model? Research has examined the Fama French model in different countries and its risk premium in different mathematical ways. This paper reconstructs the Fama-French model by replacing market capitalization size index (SMB) and book-to-market ratio index (HML) to other Exchange Traded Fund (ETF) factors to investigate whether ETF factors will improve the Fama French model. After comparing 15 ETFs, Factors EMD (GDP growth index) and SMG (factor IYC minus factor IYK) are chosen for our adapted risk model because of a relatively low rate of correlation and covariance. 20 sample stocks are selected form various industries and market capitalization size, and used to test to the performance of FFM and the new FFM. The result has been analyzed from 3 different ways: correlation and covariance, R squared, and p value. Although the new model fails to perform better than a traditional FFM, it may be improved by adding more factors or choosing factors which are more representative of the market.
Basic structure and mathematical model of integrated energy system in ecological park
Authors: Song Qianqian , Liu Yongfu , Zhang Limei , Yang Tongxu , Zhen Linteng 
Published: April 2021

Abstract
The ecological parks are rich in available resources and have various types of energy. The reasonable utilization of the available resources in the park can promote the healthy development of the park. This paper analysed the wind and solar energy resources and their output in the ecological park, and gave mathematical models of typical energy production, conversion, and storage equipment. According to the energy consumption characteristics of the park, the ecological parks were classified based on the characteristics of wind and solar power generation, and the basic structure of the integrated energy system of the ecological park was given.
Research on the flow field of variable head water flow standard facility based on numerical simulation method
Authors: Li Haiyang , Zhang Liang , Hong Bian , Li Xuejing , Chen Yuyang 
Published: April 2021

Abstract
This paper introduces a basic method of using numerical simulation to calculate the internal flow field of variable head water flow standard facility. The content includes the procedure of 3D geometric modeling, mesh gridding and boundary condition setting. The numerical results visually shows the flow filed in the facility, of which proved the correctness and feasibility of the method. The simulation results provide constructive suggestions for the design and manufacture of variable head water flow standard facility.
Research on Credit Strategy Based on XGBoost Algorithm and Optimization Problem
Authors: Cheng Yunke 
Published: April 2021

Abstract
Small and medium-sized enterprises are the important foundation of national economic and social development, and play an important role in expanding employment, increasing income, improving people’s livelihood and national taxation. In this paper, the credit decision-making of small and medium-sized enterprises is deeply studied, and reasonable credit risk quantification results and targeted credit strategies are given. To solve the first problem, this paper establishes a multi-index scoring model based on XGBoost algorithm. According to the extracted features, the credit risk of 123 enterprises is quantitatively analyzed, and the enterprises are scored according to the quantitative results. Prioritize them by score and enterprise credit rating, take interest rate and loan amount as decision variables, and bank profit as objective function, establish a multivariate and single-objective credit strategy optimization model, and get the optimal credit strategy for each enterprise when the annual total credit is fixed. In view of the second question, this paper takes the data in Annex 1 as the training set based on the first question, and extracts the features of the relevant data in Annex 2. Using the enterprise multi-index classification scoring model based on XGBoost algorithm, the credit rating of 302 enterprises is predicted and their credit risks are quantitatively analyzed, and the enterprises are scored according to the quantitative results. Prioritize them by score and enterprise reputation grade, establish the same optimization model as the first one, and formulate specific credit rules to make the results meet the limit conditions of total credit, thus determining the interest rate and loan amount of each enterprise, and obtaining specific credit strategies. In view of the third question, this paper takes the epidemic situation in SARS-CoV-2 as an example, and comprehensively considers the impact of this sudden factor on different industries and different types of enterprises on the basis of the second question. Based on the impact of corporate profits, the data are updated, the indicators are extracted again, and the XGBoost enterprise multi-index classification scoring model is used to predict the credit rating of 302 enterprises again and quantitatively analyze the credit risk, and the enterprises are scored according to the quantitative results. Once again, they are prioritized according to the score and the reputation level of the enterprise. Use the optimization model in question 2 to adjust the corresponding credit strategy. The model established in this paper considers more indicators, and the quantitative and prediction results are reasonable. The algorithm and model can comprehensively consider the impact of unexpected factors and adjust the credit strategy in time. In addition to being applied to credit decision-making of small and medium-sized enterprises, it can also be extended to other types of financial fields, providing ideas for solving related problems.
Design of High Precision Image Measurement System for Small Workpiece
Authors: Zhang Xuelin , Fu Fengzhi , Fan JunPeng , Fan Hua 
Published: April 2021

Abstract
At present, there are many problems in the measurement of small machined parts (size ⩽ 70mm, such as micro circuit board, small non-standard parts, etc.), such as the difficulty and low efficiency of detection, the large data of sizes to be detected, and mainly rely on manual work. A high-precision image measurement system based on machine vision is designed in this paper, and the systematic error and random error of the machine vision measurement system are improved from hardware and software. Experiments show that size measurement of small workpiece with high efficiency and high accuracy can be realized by the system successfully. The measurement accuracy reaches micron level, which fully meets the testing requirements of production line, and has great value of industrialization promotion.
Hematology of Pangasionodon hypopthalmus Reared Under Controlled Photoperiod
Authors: Windarti  , Amin B , Simarmata A H. 
Published: April 2021

Abstract
Manipulated photoperiod has been used to improve the growth of cultured Pangasionodon hypopthalmus. Photoperiod length affects the fish physiology in general and thus reflected in its hematological condition. The hematology of P. hypopthalmus reared in short photoperiod was studied in May–August 2020. There were three treatments applied, namely natural photoperiod (P-Nat, fish tanks were placed under clear plastic tent), 18 hours dark (P-18D, the tanks were placed under dark tarp tent for 18 hours) and 24 hours dark (P-24D, the tanks were placed under dark tarp tent continuously). The fish (3 inches TL, 4 grams BW) were reared in circular tanks ( 100 L) at a density of 30 fishes/tank and fed with commercial fish feed pellets twice a day,, ad libitum. Blood samples were obtained prior to the experiment and at the 8th week. Results showed no significant differences in hematological parameters of the fishes among treatments. The number of erythrocytes and leucocytes in the pre-treated fish was approximately 1,850,000 and 55,200 cells/ml, respectively. While those of the treated fish was 1,760,000 and 54,600 cells/ml (P-Nat); 1.760.000 and 55,000 cells/ml (P-18D) and 1,790,000 and 55,000 cells/ml (P-24D). In pre-treated fish as well as all treated fishes, hemoglobin was around 10 g/dL and glucose was around 110 mg/dL. The percentage of leucocyte type cells were as follows: lymphocyte 65%, monocyte 24%, thrombocyte 6%, neutrophil 3%, eosinophil 1% and basophile 1%. The value of hematological parameters indicate that the fish was in normal and healthy condition and thus it is proved that shortened photoperiod do not affects P. hypopthalmus health in general.
Influence of Phytogenic Feed Additives on The Health Status in The Gut and Disease Resistance of Cultured Fish
Authors: Caipang C M A , Suharman I , Avillanosa A L , Gonzales-Plasus M M 
Published: April 2021

AbstractPhytogenics are plant-derived natural compounds in the diets that aim to improve animal production. Several of these plant-derived substances have been tested in various aquaculture fish species particularly on their effects on growth and systemic immune response. Most of the previous studies demonstrated positive effects in improving growth, lowering the feed conversion ratio (FCR) and modulating the various immune response parameters in fish. While nutritional strategies are mostly designed towards the use of plant-based materials as feed ingredients or partial substitutions for the more expensive fish meal in the fish diets, recent initiatives have been targeting the use of these phytogenics as feed additives. The tissues and organs of the digestive system are the ones that have close contact with the phytogenic additives once these are ingested by the fish. Once, digested and absorbed, these substances are distributed throughout the body where they affect the physiological conditions of the fish, including its ability to provide resistance against various infectious diseases. The present work provides a short review on the effects during dietary administration with these phytogenics on gut health and disease resistance in fish. A synthesis of available information on these biological aspects in fish will provide a platform towards developing functional feeds in aquaculture.
Estimation of Growth Parameter on Sailfin Catfish (Pterygoplichthys pardalis) in Bengawan Solo River, Central Java Province
Authors: Aida S. N. , Ridho R. , Saleh E. , Utomo A. D. , Nurhayati  
Published: April 2021

Abstract
Bengawan Solo river 548.53 km is the longest river in Java Island Indonesia, which crosses provinces of Central Java and East Java. Bengawan Solo river is heavily polluted by agricultural, industrial and domestic wastes, especially in Surakarta Residence, Central Java. The impacts of pollution in Bengawan Solo river are poor water quality, the population of native fish has declined sharply and some were almost extinct. The fish that develop was Sailfin catfish (Pterygoplichthys pardalis) because these fish were resistant to pollution. The study aimed to determine the growth parameters of Sailfin catfish (P. pardalis) in Bengawan Solo river. Estimation of growth parameter using length frequency data analysis was done using the FISAT program package. The results of growth parameters of Sailfin catfish (P. pardalis) showed that infinity length (L∞) = 41.75 cm; acceleration of growth (K) = 0.48 cm/year. Natural mortality (M) = 1,1; fishing mortality (F) = 2.47; and total mortality (Z) = 3.57. Exploitation rate (E) = 0.69. The conclusion is the fishing mortality of Sailfin catfish is quite high, while natural mortality is low because the fish are resistant to pollution.
Green Catfish (Hemibagrus nemurus) Seeds Cannibali at Different Stocking Densities
Authors: Heltonika B , Zairin M , Widanarni  , Suprayudi M A , Manalu W , Hadiroseyani Y 
Published: April 2021

Abstract
Green catfish is a high economic value commodity in Riau. However, cannibalism in green catfish seeds is still an obstacle in its hatchery, and so far there has been no specific study of cannibalism in green catfish. The purpose of this research was to study the cannibalism of the green catfish seeds at different stocking densities. The research used a completely randomized design with four treatments, namely stocking density 1 (A), 2 (B), 3 (C) and 4 (D) indvidual/liter with five replications. A feed with 40% protein was given four times a day at satiation. The results indicated that the cannibalism index increased with the increase in stocking density, namely 32, 34.5, 53.33 and 51.50%, respectively. The highest incidence of cannibalism was at stocking density of 3 individuals/l, but it was not different from that of 4 individuals/l. The dominant cannibalisms are type 1 cannibalism, namely 26, 27.5, 50.67 and 43.75% respectively; however, type 2 cannibalism did not differ among treatments. There was no difference in growth performance among treatments. It could be concluded that there is a link between cannibalism and an increase in stocking density in the green catfish seeds.
Financial Analysis of The Purse Seine Fisheries Business in Panimbang Fishing Port
Authors: Irnawati R , Supadminingsih F N , Surilayani D , Nurdin H S , Susanto A , Hamzah A 
Published: April 2021

AbstractA purse seine is one of the productive fishing gear catching pelagic fish. The feasibility of the purse seine business in Panimbang was needed to analyze after the tsunami disaster in late 2018. The research aims to analyze the financial aspect of purse seine fisheries business in Panimbang fishing port. The study was conducted from May to October 2019 using survey methods. The data were collected, including investment and operational cost, amount of catches and price, and fishing unit specification. Data analysis includes calculation of benefit, Revenue Cost Ratio (R/C), Net Present Value (NPV), Net Benefit-Cost Ratio (Net B/C), Internal Rate of Return (IRR), and Payback Period (PP). The result showed the vessel of purse seine based on Panimbang used 30 GT with the vessel’s engine 120 HP. The net of purse seine was 1,000 m in length and 50 m in depth. The benefit of purse seine business was IDR 1.2 billion; revenue was IDR 3.4 billion, R/C was 1.54, NPV IDR 3 billion, Net B/C 2.58, IRR 56.57, and PP when the business reaches in 1 year seven months three days. The entire financial of purse seine after the tsunami disaster in Panimbang is still profitable and feasible.
Economic Valuation of Mangrove Ecosystem Services in Sungai Apit District, Siak Regency, Riau Province, Indonesia
Authors: Warningsih T. , Kusai K. , Bathara L. , Zulkarnain Z. , Deviasari D. 
Published: April 2021

Abstract
The mangrove ecosystem is one of the ecosystems that has high productivity in coastal and marine areas, especially in supporting the productivity of fishery resources. This is due to the function of the mangrove ecosystem as ecological and socio-economic. Therefore, to determine the high level of mangrove utilization in the coastal area of Siak Regency, an economic assessment of mangrove ecosystem services is necessary. This research aimed to study quantified mangrove ecosystem services in Siak Regency, Indonesia. Methods for data collection included field survey and interview, performed between July - August 2020. The economic value assessment comprised valuation on following service groups, i.e. supporting, provisioning, regulating and cultural services. The results showed that the economic value obtained from all studied services reached IDR 29,180,852,208 per year, IDR 24,747,680,000 per year, IDR 90,291,590,933 per year and IDR 9,245,925,366 per year, respectively. In conclusion, a total amount of economic value for mangrove ecosystem services in Sungai Apit District, Siak Regency was IDR 153,466,048,507,014 per year, which was equivalent to IDR 300,090,044,0 per hectare per year.
Characteristics of Sea Waves Condition at The Northern and Eastern of Bintan Island within Period of 2015-2019
Authors: Suhana M. P. , Shafitri L. F. , Putra R. D. , Nugraha A. H. , Koenawan C. J. , Idris F. , Karlina I. , Febrianto T. , Anggraini R. , Apdillah D. , Nurjaya I. W. , Natih N. M. N. , Syakti A. D. 
Published: April 2021

AbstractThe objective of this research was to collect the comprehensive information about the characteristics of sea waves in the northern and eastern of Bintan Island Sea based on differentiation in oceanographic conditions between the north and east coast of Bintan Island. The north coast of Bintan Island faces the open seas directly with a potential high wave and cause several characters of coastal damage, including coastal abrasion. The characteristics of sea waves are obtained by forecasting, namely converting wind speed values using the SPM (Shore Protection Manual) method. The results of this study collected comprehensive information of sea waves on the north coast during the 2015-2019 period showed a dominant pattern with the direction of sea wave propagation from north and south, while for the eastern region the wave propagation trends prevailing from north and southeast. The maximum sea wave height in the northern of Bintan Island Sea reaches 3.32 m with a period of 8.70 s while in the eastern of Bintan Island Sea the maximum of wave height condition reaches 2.90 m with a period of 8.32 s. The maximum sea wave conditions on the north and east coasts of Bintan Island occur during the north wind season (December-February) and is directly proportional to the requirements of higher wind speeds. The minimum sea wave conditions occur during the east monsoon (March-May) where during that period the wind speeds that blow are very low condition. The results of this study indicate that wind speeds in northern Bintan Island are related to wave conditions. Our research proves that higher wind speeds form higher wave conditions.
Diversity of Epipelic Diatom in The Waters of Tanjung Pinang City Province of Riau Islands
Authors: Siregar S. H. 
Published: April 2021

Abstract
Degradation indicator of water quality can be seen from changes in water quality parameters. Diatoms are one organism that can be used as an environmental bioindicator. Diatoms are the primary producers in waters so they have a very important role in the food chain. Data was collected in situ in the Tanjung Unggat waters of Tanjung Pinang City. The method used in this study is a survey method, where data is obtained through observations and measurements in the field. The samples taken are then taken to the laboratory for analysis. Epiphyte diatom samples were taken from 4 stations with different activities. Based on observations of the identification of diatom epipelic that has been done, found 22 diatom genera, namely, Pleurosigma sp., Navicula sp., Diploneis sp., Achnanthes sp., Synedra sp., Nitzschia sp., Gyrosigma sp., Surirella sp., Coscinodiscus sp., Thallasiossira sp., Thallasionema sp., Pinnularia sp., Plagiotropis sp., Halamphora sp., Biddulphia sp., Melosira sp., Chaetoceros sp., Triceratium sp., Isthmia sp., Licmopora sp., and Rhizosolenia sp. The abundance of diatoms in epipelic samples, which ranged from 905277 - 599530 ind / cm2. The structure of Epipelic Diatom Community average diversity index ranges from 3.72 to 4.65 and the dominance index value ranges from 1.09 to 1.46 and the uniformity index value ranges from 0.95 to 1.21.Then based on the results of the Storet Index classification, getting a score of -52.75 on 8 parameters tested. This scoring means that around the category of Class D Tanjung Pinang Coastal waters with a score ≥ -31 are classified as Heavy Polluted waters with the determination of the status of the waters quality is limited to 8 parameters tested.
Antioxidant Activity of Astaxanthin Flour Extract of Mud Crab (Scylla Serrata) with Different Acetone Concentrations
Authors: Karnila R. , Edison  , Ramadhani N. R. 
Published: April 2021

Abstract
Mud crabis one of Indonesia’s economically valuable fishery commodities, the high demand for crab from world and domestic trade will have an impact on the resulting waste in the form of shell waste. Crab shells contain bioactive compounds that have the potential to be antioxidant astaxanthin. This study consisted of four stages, namely (1) astaxanthin extraction (2) yield (3) terpenoid test (4) antioxidant test (DPPH). The objectives of this study were (1) to determine the amount of astaxanthin yield, (2) to determine the terpenoid test, (3) to determine the potential for antioxidant activity in mangrove crabs. The data obtained were tabulated in the form of tables and graphs, which were analyzed descriptively. The results showed that the yield with different acetone concentrations produced the highest yield of A 65%, namely 4.46 g, A 50%, namely 3.36 g and A 80% in the amount of 1.71 g. The antioxidant activity showed that treatment with the concentration of acetone extraction was able to produce the IC value of50 lowestwith acetone concentration of 65% compared to the extraction concentration of 50%. The ICvalue50 of 805.837 ug / mL is still classified as having weak or inactive antioxidant activity.
Utilization of Fermented Salted Marine Trashfish Meal for Replacing Fishmeal in Nemurus Catfish (Hemibagrus nemurus) Diets
Authors: Hasan B. , Iriani D. , Sumarto  , Warningsih T. 
Published: April 2021

Abstract
This research was carried out to determine the substitution values of fermented salted marine trash fish (FSMTF) for dietary conventional fishmeal (CFM) on growth of nemurus catfish. Four isoproteic (34% crude protein) and isocaloric (3.15 kcal DE g−1) diets were formulated. One diet was a control diet (C) in which 44% CFM was included and no FSMTF. Other three diets were test diets in which CFM was substituted with FSMTF, 50% (FSMTF-50), 75% (FSMTF-75) and 100% (FSMTF-100). A commercial diet (COM) which composed of 31 % crude protein and 2.90 kcal DE g−1 was also tested as a comparison. Nemurus catfish, 47±3.94 g in weight were distributed into triplicate net cages (2x2x1.5 m), 40 fishes per m3 water, and fed experimental diets two times daily for two months. Total substitution of fishmeal with FSMTF (FSMTF-100) in the fish diet did not affect fish growth (weight gain, specific growth rate, survival rate), feed efficiency ratio, protein efficiency ratio and protein utilization as compared to control diet. Total substitution of CFM with FSMTF gave better feed efficiency ratio, protein efficiency ratio and protein utilization than commercial diet. FSMTF therefore can completely replace CFM in the diet of nemurus catfish.