Fractions of the total head loss which constitute
the loss through duct fittings are calculated for various duct
runs in a conditioned air distribution system of a cafeteria
building project. An ‗Excel‘ plot shows a second order
increase of the fraction from 0.70 to 0.76 for an increase in
duct length from 6.2m to 22.1m. Also, an average fraction of
0.73 was obtained for an average duct length of 15.8m from
the computed values. The study shows that the loss through
duct fittings constitutes a major loss (being greater than 50%
of the total), as corroborated by results of earlier studies. The
fractions of head loss due to duct fittings obtained in this study
would serve as useful approximations for similar duct layouts
Distributed capacitive current of ultra high voltage
and extra high voltage (UHV&EHV) transmission lines has a
severe negative effect on current differential protection. The
current differential protection in this proposed paper is based
on distributed parameters line model of the transmission line
and has been used to solve the problem of distributive
capacitive current of transmission line. Time-domain algorithm
has been used to calculate currents at the set point of the line by
using both ends current. By adding linear interpolation with
low computational rate at each sampling points has been
achieved. The theoretical analysis of this method is broach to
demonstrate how the novel principle is of high sensitivity in
differentiating between the external and the internal faults of
the line. After theoretical analysis and applying the pristine
novel principle of current differential protection for UHV and
EHV transmission lines based on distributed parameters line
model, the simulation results illustrates that the analysis done
in this paper is quite appropriate as desired, correspondingly
this recently acquired principle is much reliable, compared to
the traditional principle.
Water power is a renewable energy which is economically cheap, clean and reliable. Theoretical hydropower resources of China amounted to 680 million kW, the greatest in the world. For the water maintains circulating according to a certain hydrologic cycle continuously and uninterruptedly, the water resources are considered to be a renewable energy. Therefore Hydropower is low cost due to firstly, the energy carried by the water flow is the only energy required for the power generation in the hydropower station. Secondly, the applied equipment is simpler than that of thermal power plant, thus costing less in maintenance and overhaul. If taking the fuel consumption into consideration, the annual operation cost of thermal power plant is 10~15 times higher than that of hydropower plant. Beside hydropower is clean during the course of hydropower generation, neither harmful gas, smoke, dust, ash will nor nuclear pollution will be caused. Hydropower generation has a high efficiency and conventional hydropower plant can make use of 80% water resources, while the heat efficiency of thermal power plant only reaches 30%~50%. In this paper, the study is established in the necessary Engineering development of hydropower plants and hydroelectric generation technology in China. The Chinese model base of hydropower plants features, functions, flow analysis chart and ecologic Issues are also discussed in this paper.
SEO is the process of taking actions to gain unique traffic from search engines your ranking and place on a search engine website depends on user queries which in turn on what your web page have done for Search Engine Optimization. The Web search engine is faced with a much difficulties, problems in maintaining or enhancing the quality of their performance. These problems are either uncommonly to this domain or novel variants of problems that have been studied in the literature. And the same time webmaster website web page owner facing problem to learn the search engines update policy and page ranking and index systems learn how and that thing keep important to enhance to quality of website web page to top ranking our studies focus new Google panda 4.0 policy update in search engine new Google panda 4.0 is extremely important for and quickly improve ranking of single original fresh website web page to it is keywords in top ranking in search engines. Your client has a website with the same copy used in multiple places push for immediate removal you notice this if you have you post a press release to multiple websites, for examples. The webmasters are more likely to be caught and penalized for duplicate content with the new panda update it is time to start editing and it causes their website to be completely blocked from ranking at all or at the extremely least cause their content to rank far lower than it.
To provide high date rate for indoor services and communication, femtocells and microcells are planned in LTE- Advance system but main problem is how to reduce the interference between micro and femto cells and in the middle of the femtocells. In this paper we proposed regional Average channel state (RACS) to estimate the influence of interference and then we proposed hybrid clustering based on interference graph (HCIG) to reduce interference between femtocells and microcells. Based on the Results our scheme is given to reduce the interference and improve the spectrum efficiency.
The composite insulation system of power transformers consisting of two insulation materials (cellulose and mineral oil) are the main insulation material of power transformer, the increase of moisture will reduce their insulation strength. Moisture equilibrium curves are the basis of power transformer moisture detection, however, the service data and theory analysis both indicate the present curves are not fit for old transformer. Therefore this research work is focused the law and mechanism of the impact of aging on moisture equilibrium of cellulose and mineral oil. In this paper theory of moisture absorption mechanism and impact factors of cellulose and mineral oil are analyzed. The various aged cellulose and mineral oil samples were analysis by thermal aging method. This research work is also analyzed the moisture equilibrium law and mechanism of cellulose and mineral oil, which have been both theoretical significance and applicable potentials.
Mobile and wireless networks have undergone rapid changes and have seen an unprecedented growth during the last few years. Traditional ways of networking have changed to accommodate new lifestyles and newer ways of working. Wireless networks offer several advantages over fixed or wired networks through mobility, flexibility, ease of access, speed of deployment, and low cost. Flexibility of wireless networks facilitates rapid deployment. Finally, this paper identifies the benefits of wireless technology for small businesses and features of wireless networks.