International Journal of Natural Science and Reviews


Using Mathematical Model to Analyze the Northward Migration of Marine Life

Research Article of International Journal of Natural Science and Reviews Using Mathematical Model to Analyze the Northward Migration of Marine Life Yixin Deng1*, Yulin Chen2 1College of International Communications, China Three Gorges University, Yichang, 443002, China. 2College of Science, China Three Gorges University, Yichang, 443002, China. #These authors contributed equally to this work and should be considered co-first authors. This paper studies the migration of fish caused by the rise of sea water temperature caused by global warming. It is required to predict the migration sites of herring and mackerel in the next 50 years, as well as the best, worst and most likely time for small-scale fishing companies in the original area of Scotland to continue fishing, and to formulate reasonable business strategies for such companies, while taking into account the territorial waters of other countries. The grey prediction model and linear regression model are established. By querying the sea temperature in the geographic location range ( , ) from 2010 to 2018, we predict it in terms of the quarter as the time unit. Because the result of grey prediction model is not in accordance with the reality, the final data is obtained by linear regression model. According to the data analysis, the migration routes of fish are all northward, and the main direction is to migrate to the coast of Norway, but some of herring will move to the coast of Iceland later. The grey prediction algorithm and BP neural network algorithm used in this paper have been widely used in solving all kinds of practical problems in reality, so the conclusion of this paper is feasible and extensive. Keywords: Move north; Grey prediction; Linear regression model; Ecological planning ...

Motor Vehicle Maintenance Scheduling Model Based on Genetic algorithm

Research Article of International Journal of Natural Science and Reviews Motor Vehicle Maintenance Scheduling Model Based on Genetic algorithm Yishuai Tian1*, Mingxuan Lou1, Xinhai Zhao1, Yalong Zheng1 1College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China. To solve the problem of EMU maintenance planning time, we established a hybrid linear programming model based on adaptive genetic algorithm. According to the different levels of bullet train maintenance and the different arrival time, the constraint conditions are found, and the overall minimum maintenance time is taken as the objective function. Then the problem is transformed into a hybrid Flow-shop scheduling problem with unique process constraints, and an adaptive genetic algorithm is used to solve it again. It is concluded that the total maintenance takes 1125 minutes, and no blockage occurred in all EMU during the maintenance period. To provide a consistent basis for bullet train maintenance time and scheduling. Keywords: Linear programming; Genetic algorithm; Hybrid; Flow-shop; Train maintenance ...

Integrated Application of Organic and Inorganic Fertilizer to Improve Nutritive Quality of Maize and Soybean Intercrop

Research Article of International Journal of Natural Science and Reviews Integrated Application of Organic and Inorganic Fertilizer to Improve Nutritive Quality of Maize and Soybean Intercrop Almaz M. Gezahegn1 and M.M. Yusoff2 1Ethiopian Institute of Agricultural Research, 2300, Addis Abeba, Ethiopa 2Faculty of Agriculture, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia A field experiment was conducted to evaluate the use of integrated fertilizers on the nutritive quality of maize and soybean in intercropping system in 2014 at field 2, Universiti Putra Malaysia (UPM) Serdang, Selangor, Malaysia. Fertilizer applications were either in the form of inorganic (NPK) or poultry manure (PM). Treatments comprised of combinations of three intercropping systems (sole maize, sole soybean, and maize + soybean) and four nutrient managements (control, 100% NPK, 100% PM and 50 % NPK + 50% PM). The experiment was laid out in a randomized complete block design (RCBD) with 3 replications. Results showed that intercropping maize with soybean significantly reduced protein and nutrient content of soybean; however, the oil content of soybean, sugar, oil, protein and nutrient content of maize were not significantly affected by intercropping. Sole and integrated application of NPK and PM increased the quality of both crops over control. Integrated application of 50% NPK and 50% PM fertilizer gave higher oil, protein and nutrient content of both crops. Use of 100 % PM gave better quality than the application of NPK fertilizer for both crops. This work was supported by Organization for Women in Science for the Developing World (OWSD) and Swedish International Development Cooperation Agency (SIDA). Keywords: intercropping, integrated, fertilizer, quality ...

Design and realization of fault simulation software for cooling water system of marine diesel engine

Research Article of International Journal of Natural Science and Reviews Design and realization of fault simulation software for cooling water system of marine diesel engine LI Bao-yue, JIANG Guo-he, CHEN Bi-we Merchant Maritime College, Shanghai Maritime University, Shanghai 201306, China Aiming at the problems of high training cost and high safety risk in the training of marine diesel engine cooling water system operators, a mathematical model is established based on the technical parameters, working conditions and measured data of MTU20V956TB92 marine diesel engine cooling water system. The simulation software of diesel engine cooling water system faults is developed by using Visual Studio 2012 platform, which realizes from mathematical model to code. Conversion to simulate the working state of ship cooling water system in normal operation and failure. The results show that the system can accurately simulate the normal operation and fault state of the cooling water system, and improve the actual ability of the trainers to respond to the fault of the ship cooling water system. Keywords: Marine diesel engine; Cooling water system; Fault simulation ...

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international Journal of Natural Science

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