Authors:
SERGIU FENDRIHAN, FLORICA CONSTANTINESCU, Oana Sicuia, Sorina Dinu, Marian Lixandru
Year: 2017,
Volume: 1,
Number: 1
(1 downloads)
Abstract
Ice nucleating bacteria can harm plants by stimulating the formation of ice in their tissues. On the other
hand they contribute to cloud formation and rain precipitation on earth. It looks like they can play a role to local
weather formation. In the same time the ice nucleating bacteria, has proteins which can bind ice crystal and
contribute to the crystals formation. They can be dangerous during late frosts in the spring in orchards, affecting
the blossoms, and producing damages and crop looses. They can be used in different purposes, in order to
obtain ice in different conditions. The damage in orchards is highlighted. Some bacterial products were issued in
order to fight with this kind of frost and to protect plants.
Keywords: ice nucleating bacteria, plant protection, Pseudomonas, INA genes
Authors:
Ali Magdy, Ghada Diaa, Hany Abdalla
Year: 2017,
Volume: 1,
Number: 1
(0 downloads)
Abstract
In this study, fourteen reinforced concrete beams were tested to investigate the shear behavior of lightweight fiber reinforced concrete beams. Lightweight Expanded Clay Aggregate (LECA) was used as a partial and full replacement to the normal weight aggregate. The experimental program included three lightweight concrete beams with partial replacement of aggregate, nine lightweight concrete beams with full replacement of aggregate, and two normal weight control beams. In each group one beam was cast using steel fiber concrete, one with polypropylene fiber concrete, and one without fibers. The effects of parameters such as weight of concrete, type of fibers, area of stirrups, and shear span to depth ratio (a/d) on the beams behavior are presented. The response of the tested beams is analyzed in terms of mode of failure, deflection, strain, cracking load, and ultimatecapacity. The test results are compared to those estimated from different design codes for lightweight concrete structures.
Keywords: lightweight concrete; shear behavior; failure mode; cracking load; ultimate load
Authors:
Camila Rodríguez Boada, Ismael Lavandera Rodríguez
Year: 2017,
Volume: 1,
Number: 1
(0 downloads)
Abstract
The objective of this thesis is centered in the synthesis of a method of design of broadband monopole antennas for the range of HF and VHF. The antenna must have a practical size to be installed in a mobile station (automobile) and the power must radiate omnidirectionally for transmission of interference in the frequency band of interest (20-100MHz). There are several antenna topologies that can be used, each with a variety of options of loaded sections and of them the antenna selected was the traditional monopole antenna of whip type, due to its practical size to be installed in a mobile station and the stability of its structure. With the help of CST Studio Site 2015 software, the simulation and optimization processes of the proposed antenna were carried out. This antenna was numerically optimized taking into account the load elements and considering the return losses (S11), the voltage standing wave ratio (VSWR) and the gain value, among other parameters. The results of the optimal load solution for the monopole antenna are compared to each other to arrive at the best design. The best result obtained is the monopole antenna with four load sections distributed along its length. The simulation results should show that the proposed antenna to meet the specifications of the voltage standing wave ratio below 3 (VSWR<3:1) over the entire frequency band specified.
Keywords: Antenna, monopole, wideband,VHF.
Authors:
Seyed Mahmood Hashemi
Year: 2017,
Volume: 1,
Number: 1
(0 downloads)
Abstract
The Internet of things (IoT) affects on humans life deeply. There are traditional cyber threats and also new threats. There is no guard and immunity for systems against the innumerable variance of attack and exploitation. In this paper, an approach base on Polling System is presented for secure routing IoT devices. We use polling system with probabilistic routing, so there is a probability to move from one queue to another. Probabilistic polling system allows us to perform priority of stakeholders’ votes.
Keywords: Internet of Things; Secure Routing; Polling System
Authors:
Tuahman Sipayung, Raja Masbar
Year: 2017,
Volume: 1,
Number: 1
(0 downloads)
Abstract
This research was conducted to analyze the influence of the Influence of Economic Infrastructure (Transportation And Warehousing, Electricity And Gas, Information And Communication) And Social Infrastructure (Education And Health) On Increasing Gross Regional Domestic Revenue (PDRB Daerah In the short term, the expenditure of ILG has the effect of reducing regional GDP, thereby increasing the imbalance between the western and eastern regions by 30 percent.But in the long run it will decrease inequality.The same condition can happen in the long term (western region) that has advanced impact spread effects to the region (47 percent), ILG (78 percent), IIK (37 percent, IP (17 percent) All of these variables are positive and significant, except for the coefficient of IK (- 47 percent) long-term consequences of increasing budget allocations for electricity infrastructure k and gas carry consequences on health infrastructure.
Keywords: Economic Infrastructure, Social Infrastructure, Gross Regional Domestic Revenue
Authors:
Karim Lahmar
Year: 2018,
Volume: 2,
Number: 1
(0 downloads)
Abstract
The hydrological rate of flow of the watershed of Lake Laya El Hammam depends on its morphometric and
geological features as well as its precipitation.The watershed of Lake Laya El Hammam is part of the coastal
watersheds in the central-east of Tunisia. It is the only watershed which is not affected by hydraulic constructions
such as dams. Besides, it features a surface area that extends to 204 km2 and a high recorded rainfall. To
determine the hydrological rate of flow of the watershed, we had to identify its geological and morphometric
characteristics, and gauge the flow of Lake Laya El Hammam. The final results have allowed us to identify: the
general aspect of the flow of water in the watershed of Lake Laya El Hammam, the relationship lake/ sheet and
the importance of gauging in Eastimating the rate of flow of water during periods marked by lack of rain.
Keywords: watershed, hydrological rate of flow, Lake of Laya El Hammam, Tunisia.
Authors:
Egemen Hopalı, Özalp Vayvay
Year: 2018,
Volume: 2,
Number: 1
(0 downloads)
Abstract
In the recent years, Internet of Things (IoT) has acquired a remarkable attention. IoT projects a world where
billions of smart, interacting things are able to offer various services to near and remote entities. This innovative
technology enables users to identify and control services. Customers can benefit from the functional guidance.
Therefore, the voice of customers is transmitted to manufacturers. The benefit and welfare that the IoT brings
about are undeniable; on the other hand, there are some challenges to apply IoT. The main objective of this
study is to reveal the usability challenges of IoT in developing countries through a detailed literature survey.
Keywords: Internet of Things (IoT); innovation; cyber physical systems (CPS); security
Authors:
Denis Chemezov
Year: 2018,
Volume: 2,
Number: 1
(0 downloads)
Abstract
Testing results of a multi-cavity mold for injection molding of MIM 4140 alloy are presented in the article.
Recommendations for manufacturing of forming parts of the mold were given. Based on an implemented
technological process of casting and subsequent laboratory researches an information was obtained about the
condition of a casting (hardness on Super-Rockwell, shrinkage and quality of a surface layer of material before
and after heat treatment). Calculated overall dimensions of the forming parts of the project mold will allow making
forecast of shrinkage of MIM 4140 alloy after injection molding.
Keywords: a casting, a mold, MIM 4140 alloy, a surface layer, injection molding.
Authors:
Mehmet ERİŞ, Özalp VAYVAY
Year: 2018,
Volume: 2,
Number: 1
(0 downloads)
Abstract
Software projects’ past goes back to four or more decades. We encounter the first software project risk
management paper in 1991[1] and the study [2] reports that in 1995 US spent $250 billion to software projects
and these projects had estimated $59 billion in cost overruns and another $81 billion had spent on canceled
software projects.Although failures are tremendous, we have observed the project risks and critical success
factors are given like shopping lists and so the remedies of risk factors. Very few studies exist for searching the
relationships of these risk factors and the relationship between remedies and risk factors. We are trying to
construct a simple model of risks and remedies borrowing concepts from systems and control theory.
Keywords: ijiesr, www.ijiesr.com, ERP Projects
Authors:
Hakan İNAÇ, Özalp Vayvay
Year: 2018,
Volume: 2,
Number: 1
(0 downloads)
Abstract
Today, the most important modes of transportation for cities are public transportation. Public transport provides
citizens with fast, reliable, timely and inexpensive transportation.Public transportation systems are constructed
according to the size of the cities. Bus systems are the most common means of public transport in small-scale
cities. However, as cities grow, the rail system becomes an important model for public transportation.
Turkey's largest city of Istanbul has a population of over 14 million. With a 149 km rail system line, it is aimed to
create a railway system network of 1.000 km for public transportation in Istanbul.
In this context, 276 km railway system construction is continuing. The completion of the investments financed by
the municipality and the government at the targeted time and in the desired qualification is very important in
terms of the quality of life of the citizens. For the Rail System Lines, risk management is required to achieve the
intended objectives.
In this study; continuing rail system projects in Istanbul; design, engineering services (supervisor) and
construction phases. For the study, a risk matrix was created and a questionnaire survey was conducted with 60
senior experts working on the Istanbul rail system projects in the public and private sectors. Survey results and
evaluations were given in the study.
Keywords: risk management;survey;stakeholders management; sustainablity; istanbul; rail system.
Authors:
Daewook Kim
Year: 2018,
Volume: 2,
Number: 1
(0 downloads)
Abstract
In this paper we consider the initial-boundary value problem for a nonlinear equation induced with
respect to the mathematical models in mass production process with the one sided spring boundary
condition by boundary feedback control. We establish the asymptotic behavior of solutions to this
problem in time, and give an example and simulation to illustrate our results. Results of this paper are
able to apply industrial parts such as a typical model widely used to represent threads, wires, magnetic
tapes, belts, band saws, and so on.
Keywords: Mass production process asymptotic Behavior one sided spring boundary condition boundary feedback control
Authors:
Aniagolu Celestine Obinna (Phd)1 ,, Obodo Mercy Chika, Ewurum Nonso Izuchukwu
Year: 2018,
Volume: 2,
Number: 1
(0 downloads)
Abstract
Nnewi in the past two decades has grown considerably not only in size and infrastructural
development but also as a commercial town to reckon with in Anambra State South-East Nigeria.
This work therefore tries to assess the performance of commercial real estate development as an
investment option in Nnewi using shops, offices and warehouses. This study is also delimited to old
Nnewi-Onitsha road, Edo-Ezemewi Road and Nwagbara Road which are important commercial roads
(CBD) in Nnewi. The study tries to determine the performance of the selected commercial uses in the
selected roads from 2006 – 2010 and 2011 – 2015. Thereafter a comparison of the two periods was
made. The survey research method was adopted. Data was collected through questionnaires
distributed to Landlords of commercial properties in the study area, Estate Surveyors and Valuer,
property developers in Nnewi and other secondary sources. The hypothesis developed was tested
using ANOVA. The study shows a significant difference in the performance of shops offices and
warehouses in Nnewi. The study recommended among other things that real estate investors in
Nnewi and indeed in Nigeria should seek the help of professionals (Estate Surveyors and Valuers)
who will carry out market and consumer preferences research/analysis before they venture into
commercial real estate development.
Keywords: Assessment, Performance, Investment options, Real Estate, Commercial Estate.
Authors:
Walid Aich
Year: 2018,
Volume: 2,
Number: 2
(0 downloads)
Abstract
A three-dimensional numerical analysis of laminar natural convection with entropy generation in an open
trapezoidal cavity filled with water has been carried out. In this investigation, the inclined wall is maintained at
isothermal hot temperature while cold water enters into the cavity from its right open boundary and all other walls
are assumed to be perfect thermal insulators. Attention is paid on the effects of buoyancy forces on the flow
structure and temperature distribution inside the open enclosure. Rayleigh number is the main parameter which
changes from 103
to 105
and Prandtl number is fixed at Pr =6.2. Obtained results have been presented in the
form of particles trajectories, iso-surfaces of temperature and those of entropy generated as well as the average
Nusselt number. It has been found that the flow structure is sensitive to the value of Rayleigh number and that
heat transfer increases with increasing this parameter.
Keywords: Natural convection; Entropy generation; Trapezoidal cavity; Rayleigh number; Nusselt number
Authors:
Richard OnyinoSimwa
Year: 2018,
Volume: 2,
Number: 2
(0 downloads)
Abstract
The effect of adverse climate change is of major concern worldwide and several approaches are being developed
to mitigate against anticipated economic and social disaster. Carbon emissions has been identified as a major
contributor to the adverse climate change and following the Kyoto protocol , European countries have , through a
caucus, effected a market to reward or fine members depending on their compliance position. The commodity for
the market is the carbon emission credits. Stochastic models for pricing of options on these credits are
considered in this paper. In particular, we determine the price basing on the Normal Inverse Gaussian and the
Brownian Motion models. Maximum Likelihood Estimation is applied to determine model parameter estimates in
each case. It is shown that the Normal Inverse Gaussian model has a better fit to the data but gives higher prices
for a given strike price , compared to the Brownian Motion model
Keywords: Carbon Emission Credit, Brownian Motion, Kyoto Protocol Compliance, Normal Inverse Gaussian Distribution, Fourier Transform, Risk-Neutral Option Pricing.
Authors:
Hans W.P. Koops
Year: 2018,
Volume: 2,
Number: 2
(0 downloads)
Abstract
In vacuum nano electronics different electron sources are used. They usually consist of hot or cold zirconia,
tungsten, or carbon tips, the latter being in diamond or nanotube form. Electron sources of a special composite of
precious metal crystals, which are embedded in a fullerene matrix, were first developed in 1992 at the Research
Institute of Deutsche Telekom FTZ in Darmstadt, Germany. With those very high emission current densities were
achieved and were brought to applications. Outstanding room temperature conductivities were achieved with
these nanogranular composite materials, and are presented here along with a model to explain the measured
data,
Keywords: compound materials, ijiesr
