Journal of Theoretical and Applied Sciences


Determination of Appropriate Seed Rate and Row Spacing of Bread Wheat for Highlands of Guji Zone

Research Article of Journal of Theoretical and Applied Sciences Determination of Appropriate Seed Rate and Row Spacing of Bread Wheat for Highlands of Guji Zone Seyoum Alemu, Yared Tesfaye, Obsa Chimdesa, Kabna Asefa, Girma Teshome Bore Agricultural Research Center Wheat is one of the major staple crops in Ethiopia in terms of both production and consumption. Even though it is such an important cereal crops in Ethiopia, it is giving low yield due to many production constraints such as lack of improved varieties, poor agronomic practice (inappropriate seeding rate and row spacing), diseases, weeds and low soil fertility in Ethiopia in general and in Guji zone in particular. Therefore, field experiment was conducted during the 2015-2017 main cropping season at Bore and Ana sora to assess the effect of seeding rate and row spacing on yield components and yield of bread wheat; and to determine appropriate seeding rates row spacing for bread wheat. The experiment was laid out RCBD in a factorial arrangement with three replications using a wheat variety known as ‘Huluka’ as a test crop. The treatments consisted of four levels of seeding rate (100, 125, 150 and 175 kg ha-1) and four levels of row spacing (15, 20, 25 and 30 cm) consisting a total of 16 treatments. Analysis of the results revealed that all parameters were significantly (P<0.05) affected by the interaction of the factors (seeding rate x row spacing) as well as the main effects except date to 50% heading and plant height which did not significantly (P<0.05) affected. The highest grain yield (4239 kg/ha) were obtained from combination of 150 kg/ha seeding rate and 20cm row spacing. Therefore, use of 150 kg/ha and 20cm row spacing can be recommended for production of bread wheat for the study area (Bore and Ana Sora) and other ...

Optimal Solution in Generator Selection

Research Article of Journal of Theoretical and Applied Sciences Optimal Solution in Generator Selection Zhong Zheng1*, Yu Cao2, Hairui Zhang2, Weiming Jing3, Qian Cao4 1College of Electrical Engineering & New Energy, China Three Gorges University, Yichang, 443002, China. 2College of Science, China Three Gorges University, Yichang, 443002, China. 3College of Computer and Information Technology, China Three Gorges University, Yichang, 443002, China. 4College of Foreign Languages, China Three Gorges University, Yichang, 443002, China. This paper focuses on the application of nonlinear programming in solving the optimal selection strategy of generator. A nonlinear programming model for optimal scheme selection was established. Comparative analysis, numerical combination analysis and sensitivity analysis were used to solve the problem, and MATLAB, LINGO and other software were used to assist the calculation. According to the actual background provided in this paper, it can be concluded that the minimum cost of this factory in a week of power failure is 1868443.7 yuan without charging. If the remaining 20% of the battery is taken into account, the minimum charge is 2575502.0 yuan. After obtaining the results, the sensitivity analysis was carried out to improve the practicability of the results. Keywords:  Nonlinear programming model; Sensitivity analysis; Numerical combination analysis ...

Nutritional Value and Associated Potentials Risks of Seafood Consumption

Review Article of Journal of Theoretical and Applied Sciences Nutritional Value and Associated Potentials Risks of Seafood Consumption Abdul Kader Mohiuddin Department of Pharmacy, World University of Bangladesh, 151/8, Green Road, Dhanmondi, Dhaka – 1205, Bangladesh Seafood provides essential nutrients to the body. A study funded by CDC found that eating seafood for essential Omega-3 fatty acids can prevent 84,000 deaths each year [1-3]. According to a Harvard study, 3-ounce servings of fatty fish a week reduces the risk of dying from heart disease by nearly 40% [4]. Eating 8 two servings of fish per week during pregnancy can improve baby’s IQ, cognitive development, and eye health [5,6]. Older adults with the highest fish consumption live and average of 2.2 years longer [7]. But all these statements possess another side of the coin. Food-born poisoning, mercury-lead-arsenic-cadmium poisoning, exposure to polycyclic aromatic hydrocarbons (PAHs) raised the issue of safety with aberrant consumption of seafoods. Seafood choices that are very low in mercury include: salmon, sardines, pollock, flounders, cod, tilapia, shrimp, oysters, clams, scallops and crab. The U.S. Food and Drug Administration (FDA) and Environmental Protection Agency (EPA) have developed directions to help consumers minimize risks that could be associated with several pollutants (specially mercury) in seafood. Keywords:  Nutritional Value, Associated Potentials Risks, Seafood Consumption ...

The Ultimate Strength of Ring Stiffened Cylindrical Shell and Its Influence Factors

Research Article of Journal of Theoretical and Applied Sciences The Ultimate Strength of Ring Stiffened Cylindrical Shell and Its Influence Factors XIONG Zhixin1, HUI Hanju1*, HUANG Zhiquan2 1College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. 2College of Logistic Engineering, Shanghai Maritime University, Shanghai 201306, China. Calculating the modes of cylindrical shell, then embed them into ideal perfect cylindrical pressure-resistant shell as the initial geometric imperfections to form the modal. According to the characteristics of each mode, the first 30 modes can be classified into four types, and it is found that the mode of the first type is the worst defect form. By calculation, the cylinder shell has the minimum ultimate strength when the 23rd mode happened. The sensitivity analysis of cylindrical shells with initial geometric defects shows that the critical buckling load has approximate linear relationship with different thickness radius ratio and defect amplitude. Six cylindrical shells of different materials are selected for research, and it is found that although the modal orders of the worst geometric defects of various materials are not the same, they all belong to the first type of mode. The comparison showed that the 921 steel and 909 steel materials are economic. Keywords:  Ring-stiffened cylinder; Ultimate strength; Initial imperfection; Mode ...

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Journal of Theoretical and Applied sciences

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