Engineering Research and Reviews

Aiming at the problems of high operating cost, high training cost and large site requirement of traditional marine engine platform, the software of fault diagnosis system for marine diesel engine intake and exhaust system is developed by using Visual Studio 2012 platform. The relevant mathematical model is established by numerical method, and the conversion from mathematical model to code is realized to simulate the working status of marine intake and exhaust system in normal operation and failure. The results show that the simulation system runs well with low cost and small site requirement. It can accurately simulate the normal operation and fault state of the ship intake and exhaust system. It can be used for training work and improve the actual response ability of the trainers to the fault of the ship intake and exhaust system.

Due to the increase of private vehicles in China cities, high-level pollution is often detected in urban street canyons. The study selected Jinlu building as the research object and used FLUCK985 particle counter to collect the particles concentration at different heights, at the same time, combined with meteorological to study the vertical variation characteristics. Finally, combined with the feature of human body, the exposure assessment method was used to analyze the effects of particulate matter on human health. The results are as follows. (1) As the diameter increased, particles number decreased. The CV (Coefficient variation) alongside viaduct was smaller than non-viaduct and the CV degree is weak or moderate. (2) The contamination degree in viaduct is greater than non-viaduct. The particulate concentration decreased with the increase of floor, but near viaduct, the coarse and fine particles showed different trends. (3) The early peaks concentration was more than evening peaks in sunny, windy and rainy days, among them, the sunny concentration was more than rainy days; the windy days concentration was changed during the different diameter. (4) the viaduct RDD was more than non-viaduct. The RDD was highest in Older; the second was Adult and Child RDD was the lowest. The RDD in early peak was higher than evening peak of which PM10 always stay on the nasal cavity. Thus the people should try to shorten linger under viaducts so as to prevent the coarse particles from causing discomfort to nasal cavity.

The calculation of the masses of celestial bodies based on the theory of vortex gravity, cosmology and cosmogony is proposed. The actual values of the masses of celestial bodies are two orders of magnitude greater than the generally accepted values.

Reliable and stable island power supply system is an important guarantee for the development of the island. Based on the island connected to the main network by cable, this paper proposes an interactive multi-energy complementary microgrid consisting of new energy generation, electric energy interaction, electric vehicle charging and discharging, home photovoltaic system, power distribution and emergency rescue. The electricity generated by the residents themselves can be used by themselves, and the excess can be sold back to the main network. This system makes full use of the characteristics of electric vehicles energy storage and mobility and participate in grid dispatching, which can improve the popularity of new energy power generation, balance the peaks and valleys of island electricity consumption and reduce the cost of electricity for residents.

As Nigeria takes a bold step to revive her iron ore company, it is pertinent she takes adequate account of her economic and technological limitations, in order to achieve a return on this venture. To this end, the Net Discounted Present Value approach to investment appraisal in mine economics, was employed to evaluate two feasible investment options (spare part importation and conventional sand casting) for sourcing parts of earthmoving equipment on the profitability of Nigeria’s iron ore mining company (NIOMCO),over a period of five years. Findings revealed that, both options are not profitable to the federal entity, owing to the high rate of Nigeria’s inflation (15.98%) and unfavorable market exchange rate of $1 to 359.201. However, it recommends that the entity be privatized to financially buoyant investors, able to withstand the cost of operating the company. Also, a new price has to be set, using the absorption pricing technique, in order to absorb running costs, through the projected period of five years. In addition, no additional unit of labour, be employed, due to its evident burden on running expenses, over the projected period of five years. Unfortunately, selling iron ore concentrate at the prevailing market price ($62.59) was found not to be profitable to the entity. To this effect, the design of modalities aimed at penetrating and coping in the domestic market is a necessity, to enhance the entity’s sustainability, in the short-run. This is subject to further research.

A new principle of origin and the nature of the action of gravity forces are proposed. Forces of universal attraction have plane-symmetrical directions. On this basis, it becomes possible to reconsider certain regularities in natural science. The new principle of gravitation will allow to explain physical paradoxes, to improve methods of scientific research and some technological processes.

The purpose of this project is to share the finding of study and advocate the need for the administration of Federal Polytechnic Oko to undertake the issue of providing Water to the Polytechnic community as paramount and the solution to the receding Iyiocha lake which could useful in the provision of water. The poor state of water and sanitation facilities in the campus particularly the permanent site is a major factor for the declining health and the reduction in productivity among the students and staff. The major water and sanitation related ailments reported in the school apart from malaria are diarrhea and worm infestation, which indicates that water and sanitation facilities are inadequate in the campus and to ascertain the cause of solution to the receding lake. Therefore, there is a need for such facilities to be provided and upgraded in spite of the environmental consequences of the receding lake which is to be (-1.1) due to environmental impact, also in the rainy season to observe good contribution of water from the lake to the ground water ,as it ceases to discharge to the Lake during rainy season. The main objectives are to identify enough water to serve the population with adequate water supply and promoting better health practice focusing on the use of clean water, good hygienic and proper excretion disposal. Moreover rainfall data was collected from the department of Geography and Meteorology, Nnamdi Azikiwe University Awka, was used to determine the re

The paper describes the consequence of environmental development as degrading, disrupting process to social activities, leading to unconducive life through economic, social system and cultural value. Environment and Development complementing each other, where a carefully nurtured environment continues to provide the basis for continuous development.

This paper investigate an approach based on Ant Colony Optimization to identify optimal size, number, cost and placement of D-STATCOMs in radial distribution systems. Objective functions integrating power loss, voltage deviation and cost minimizations are solved by Ant Colony algorithm developed in MATLAB. This algorithm is tested on the IEEE 33- bus system and on a real distribution network of SBEE (Beninese Society of Electrical Energy). As results, it is observed that losses are reduced to 22.42 percent for IEEE 33-bus system with five D- STATCOMs and global installation and operating estimated cost of 3546762.35 dollars in first, and then, losses are reduced to 61.63 percent with four D-STATCOMs and cost of 2493146.29 dollars for a real distribution system of SBEE.

Compared with the common angle steel tower, the narrow base steel pipe tower has the advantages of simple structure, beautiful appearance, small floor area and better coordination with the urban environment. In the construction of urban high pressure transmission line, the narrow base tower has its own unique advantages and wide application prospects. It has the advantages of ordinary iron tower processing, transportation, assembly, cost saving, small occupancy of single column steel pipe rod, small line corridor and beautiful beauty. In the optimization design of the narrow tower, how to take the wind vibration coefficient of the tower, how to consider the bending moment of the rod end, the design of the narrow base tower and the structure optimization of the narrow tower tower are all the problems to be solved urgently. In this paper, the modal analysis of a single tower is carried out to determine its vibration mode, and then the wind vibration coefficient of a narrow tower is analyzed. Finally, the influence of x and y direction vibration on the frequency of the tower is obtained.