The use of wireless sensor networks to monitor and control the precise agriculture is one of the areas which received broad concern in recent times, for the services, facilities and the reliability provided by these networks on the monitoring and con
trol level.
This research contributes to the study of the application of this technique in greenhouses deployed over large areas in our country. It offers solutions for networks of monitoring and control, in real time, and ensures a good performance according to the essential evaluating criteria, such as reducing the time-delay, and increases throughput, increases the delivery ratio of packets, and reduces the number of packets lost along with increased network load.
In order to do that, a number of scenarios are proposed. These scenarios are similar to the reality of the construction and operation of the greenhouses in our region relying on ZigBee technique. Wireless sensors networks of these scenarios have been tested, using simulation in order to make conclusion and recommendations to guide the work while installing such networks in place to work as their best for different areas and a large number of lounges
It is very important to the design and development of
natural isolating materials Which are used in the cover-up of solid waste landfill, clay soils or mixtures of these soils and some
additions used as an impermeable liner for construction of soli
d
waste landfill, The permeability coefficient of the materials used in the impermeable system is the most important factors to prevent water leakage into the body of landfill site and to prevent the Leachate of leak into groundwater and soil surrounding the landfillsites.
In this research has been the development and design
Oedometer cell to study volumetric distortions occurring in these
soils as a result of exposure of these soils to climatic conditions
during the implementation of impermeable layer or after
implementation due to rising temperatures in landfill because of
biological interactions taking place at these landfill.
It has been modified and the development of Oedometer
cell to become a thermal cell So that it can control the degree of
heat applied to the sample in the ring of device and then measure the volumetric changes in the sample, Oedometer cell has been linked to the permeability test system with variable head to measure the permeability of the testing sample, It was connected with the digital control , measuring and showing system for temperature and load and displacement.
The spread of the modern data transfer techniques, in modern industrial and agricultural applications, and service areas, leads to the need to transfer this data effectively and flexibly, within installations parts.
This research aims to apply the h
ybrid mechanism, based on the use of ZigBee technology, and CAN Bus together to ensure the best performance, in accordance with the performance indicators required by the networks of these facilities, in near-real time operation. The study attempts to compare this mechanism with other mechanisms proposed in similar research.
The proposed solution supports the use of a hybrid data transfer networks, based on the internetworking of CAN Bus networks, using a backbone based on wireless ZigBee technology. This solution proposes an appropriate structure for gateways between the hybrid parts of the network. The research has concluded that the proposed mechanism preference, compared with the proposed mechanisms in similar research, according to the standards of performance indicators, is suitable for this kind of networks, as it allows us to recommend the use of this mechanism in the service and industrial applications. The NS2 network simulator is used to evaluate and compare the obtained results.
The wireless sensors network applications are widely used in health monitoring systems. In fact, they contribute to the qualitative development of these networks so as to ensure the tireless clock surveillance, and improve and regulate the quality of
monitoring. Associated with improving the performance of wireless medical sensor networks WMSN is improving data transfer mechanism which is one of the most important areas of interest to research and study in recent times.
Hence the importance of this research lies in the study of the structures of wireless sensor networks that can be used to control the wards in hospitals, health centers and monitoring care. The research also draws necessary recommendations and suggestions for the selection of appropriate medical wireless sensors networks structure and proposees appropriate medium access control mechanism in order to build networks of different sizes.
This has been done by proposing appropriate scenarios for surveillance applications to perform simulation that is similar to the working conditions of the networks. This can ensure the transfer of nodes data to the main access point and can give an opportunity to study the impact of network architecture and how to use the data transfer technology, specifically the use of ZigBee technology, both with beacon mode enabled inenabled. Improvement was evaluated based on the basic parameters in such networks, such as throughput, the time delay, and the delivery ratio. The study found a set of recommendations regarding the size of the network, the type of structure and the mechanism used to access medium.
The Roller Compacted Concrete (RCC) offers a different concept in the creation of pavement and concrete dams it’s dry Beaton (Zero Abrams slump), with a low water content, and includes of dense mix consisting of graded coarse aggregate, and cementati
ons materials, and water, this makes it so difficult to compact it in big thicknesses layers without using large energy rollers compactors. concrete conveys by trucks, placed and compacted by using equipment asphalt pavement. The main advantage of this technique is in reducing the completion time and cost savings in labor and the possibility of replacing traditional materials in road paving. It also provides a solid surface smooth and polished, and would facilitate the operations of traffic expected in all circumstances and various factors such as axial loads and environmental conditions.
This paper presents a new technology for the manufacture of Roller compacted concrete samples by applying a mechanism of Vibro-compaction pressure on samples of fresh concrete. It had Been manufactured concrete samples differ from their limestone filler content, and after conducting an analytical study of the results of tests of these samples has been reached to ideal feller content for this type of concrete by reliance on the mechanical strength and speed of evolution with time as criteria for the basic design.
This research has been implemented in Homs city-Syria, in order to study the
configuration of the road network in residential district, and the debates about the most
efficient pattern in terms of functional performance, treeor grid pattern, or oth
er patterns.
In order to do that, it focused on the planning principles of functional performance, which
can be summarized to:( proximity, permeability, security). And worked on identifying
Accurately the functional performance indicators, and there measuring method, and they
were (Cell / Cul ratio – T / X ratio- distant between the center and the periphery - number
of cells per unit area –hierarchy). And applied it on the case studies: (organized / newly
planned residential districts). It turns out that the road network should have a medium
proximity and permeability for traffic,while it should be high for pedestrian. Therefore,the
network patternCandidate forbetterfunctional performance when it's nearly in the mid-way
between (tree and grid).
The Loos powder Sintering for metals powder is one of
the important manufacturing methods, where contact and
solidity are insured among particles, The high porosity
Filters which is sintered from metal powders is one of the
best filters .
The re
search aim especially to study the Temperature Effect
of loos powder sintering on Mechanical properties of
bronze gas filters works at 200 bar.
The idea of spatial interpolation stands of great importance depending on the accuracy of
estimated (Hydrogeological) parameters of this area, which reduces excessive efforts to
reach the best Hydrogeological model of the region with as little as p
ossible, thus reducing
the overall cost of the project.
The studied area is located within the Sin plain (the southern part of the JABLEH plain).
A free layer of water, ranging between 1m and 30m in thickness.
The study relied on groundwater level data, soil thickness and type in 339 wells.
The importance of this research Lies in mapping the best spatial distribution of
characteristics using spatial statistical methods
The aim of the research is to estimate the Coefficient of Permeability of the aquifer layer
and its effective thickness using the two methods of spatial statistics methods (Kriging and
IDW) for Hydrogeological parameters in the southern part of the Jableh plain.
