JMASM 55: MATLAB Algorithms and Source Codes of \u27cbnet\u27 Function for Univariate Time Series Modeling with Neural Networks (MATLAB)

Artificial Neural Networks (ANN) can be designed as a nonparametric tool for time series modeling. MATLAB serves as a powerful environment for ANN modeling. Although Neural Network Time Series Tool (ntstool) is useful for modeling time series, more detailed functions could be more useful in order to get more detailed and comprehensive analysis results. For these purposes, cbnet function with properties such as input lag generator, step-ahead forecaster, trial-error based network selection strategy, alternative network selection with various performance measure and global repetition feature to obtain more alternative network has been developed, and MATLAB algorithms and source codes has been introduced. A detailed comparison with the ntstool is carried out, showing that the cbnet function covers the shortcomings of ntstool

Turkish cargo strategies

Serdar Demir divided his speech to three sections as Turkish Airlines, Turkish cargo and Turkish cargo strategies at the 3rd airport. In the first section, he talked about general situation of Turkish Airlines. In the second section, he talked about Turkish Cargo within the framework of Turkish Airlines and finally, in the third section, he explained what new airport brings to the Turkish air cargo.Serdar Demir konuşmasını Türk Hava Yolları, Türk Kargo ve 3. Havalimanında Türk kargo stratejileri olarak üç bölüme ayırdı. İlk bölümde, Türk Hava Yolları’nın genel yapısı hakkında konuşmuştur. İkinci bölümde, Türk Hava Yolları altında Türk kargo stratejileri hakkında konuşmuştur ve son olarak, üçüncü bölümde, yeni havalimanının Türk hava kargosuna neler getireceğini açıklamıştır

Composites of reactive silica nanoparticles and poly(glycidyl methacrylate) with linear and crosslinked chains by in situ bulk polymerization

Composites of poly(glycidyl methacrylate) (PGMA) and L-lysine-coated silica nanoparticles with varying contents were prepared by in situ bulk polymerization using benzoyl peroxide (BPO) as free radical initiator. Silica nanoparticles covered by L-lysine molecules were synthesized using emulsion method. Dynamic light scattering measurements confirmed that the particles are highly monodisperse with the diameter of 10 nm and free of aggregates in the monomer (glycidyl methacrylate, GMA). Upon polymerization of the homogeneous particle/monomer dispersion, aggregates of individual silica nanoparticles are observed by tapping mode atomic force microscope (AFM). Amine and/or carboxylic acid sites on particle surface covalently react with the oxirane groups of the polymer backbone. The aggregation was substantially suppressed by using a difunctional comonomer divinyl benzene (DVB) in polymerization. A three-dimensional polymer network, P(GMA-DVB), forms throughout the system. This structure leads to significant progress in particle dispersion, therefore in physical properties of the resulting composite. We demonstrated that the composites prepared by crosslinked chains are thermally more stable and mechanically stiffer than those prepared by linear ones.TÜBİTAK TBAG-109T905; TÜBİTAK TBAG-108T446; State Planning Organization (DPT-2003K120690-6

Analysis on Loneliness Levels of Students in Summer School of Physical Education and Sports School

The purpose of this study is to analyze the loneliness levels of students studying in 2017-2018 summer school of Balıkesir University School of Physical Education and Sports by some demographic characteristics. This is a descriptive study. The research population is composed of 865 students studying in 2017-2018 summer school of Balıkesir University School of Physical Education and Sports and the sample is composed of randomly selected 348 students. “UCLA Loneliness Scale” adapted into Turkish by Demir (1989) was applied in the study. The overall reliability of the loneliness scale was found to be α = 0.74. Kolmogorov Smirnov test was evaluated for the conformity of UCLA Loneliness Scale to the normal distribution in data analysis. Since all data were observed not to be normally distributed, Mann Whitney U and Kruskal Wallis tests ranked among the non-parametric tests were performed to compare the loneliness levels. All analyses were performed with SPSS v17.0 (SPSS Science, Chicago, IL, USA). In conclusion, it has been determined that the loneliness levels of the participants are high (51.07%), there is no statistically significant difference by the variables of sex, age, adequate leisure time, recreation and the place of residence while significant differences have been observed by the variables of department, branch and grade

Kentsel Katı Atık Üretiminin Belirleyicileri

In this paper the economic and social determinants of solid waste production in Turkey are investigated. For this purpose, the econometrics models are estimated by using the cross sectional data in 2001 of 81 provinces from Turkish Statistical Institute Databank. The dependent variable in the models is average amount of solid waste discharged annually per capita. Independent variables are gross domestic product per capita, population, average size of households, rate of children aged 0-4, population density, rate of graduated :from university and median age. According to the estimation results, the effects of the population, gross domestic product per capita and average size of households on the average amount of solid waste per capita is significant. These results which are related to Turkey are agreed with the results in literature in terms of magnitudes and signs of the coefficients. However because of inadequate data, the results should be assessed providentl

Prijenos topline u mjehurastim stupcima

Bubble columns are gas-liquid contactors often used in industry. Although they are used primarily for mass transfer purpose, since gas and liquid phases are fed to the column at different temperatures, direct contact heat transfer becomes important as well. This research is about the heat transfer characteristics of bubble columns. Experiments were carried out using a plexiglass column with dimensions 160x160x1180 mm. Water was first put into the column to the height of 1 m and heated to the desired temperature, and then experiments were performed by introducing ambient air to the column and recording the variation in temperature of water and inlet and outlet air temperatures and humidities. Models developed for the convective heat transfer from the liquid interface to the gas in the bubble were used together with the experimental data to determine the heat and mass transfer coefficients. The volumetric heat transfer coefficient (hGa) was found to vary over the range 0,3-16 kW/(m3·K) with gas flow rate and the volumetric mass transfer coefficient (kGa) in the range 0,35-7,49 kmol/ m3·s·atm.Mjehurasti stupci su dodiri između plina i kapljevine koji se često koriste u industriji.. Iako ih se primarno koristi s ciljem prijenosa mase, budući da se plinska i kapljevita faza razdvajaju u stupce pri različitim temperaturama. tada njihov izravni dodir postaje važan za prijenos topline.. Ovo se istraživanje bavi karakteristikama prijenosa topline mjehurastih stupaca. Eksperimenti su napravljeni koriste cilindar od plexiglasa dimenzija 160x160x1180 mm. U cilindar je prvo ulivena voda do visine od 1 m i koja je zagrijavana do željene temperature, nakon čega se u tu vodu uvodio zrak okolišnje temperature, pri čemu se mjerila promjena temperature vode, kai i ulazna i izlazna vlažnost zraka. Modeli razvijeni za konvektivni prijenos topline sa slobodne površine kapljevine na mjehur su korišteni zajedno sa eksperimentalnim podacima za određivanje koeficijenata prijenosa topline i mase.. Iznađeno je da je volumetrički koeficijent prijenosa topline varirao u području 0.3-16 kW/(m3·K) s protokom zraka i volumetričkim koeficijentom prijenosa mase u području 0.35 – 7,39 kmol/(m3·s·atm

The using levels of the teaching methods and techniques by teachers

AbstractThis study aims to determine the teaching strategies, methods and techniques teachers use in Science and Technology classes and what they lack in this issue. 95 teachers, 45 of whom are science teachers and 50 of whom are primary school teachers, were subjected to a survey, and 33 teachers were interviewed orally. It was revealed that the teachers don’t have sufficient knowledge about teaching strategies, methods and techniques and that they can’t distinguish between these concepts. It was seen that the teachers use explanation and question-answer methods more often even though they know that the best technique is the experiment technique and they seldom get their students to carry out experiments. It was concluded that the teachers who don’t exploit various methods despite knowing their advantages need in-service trainings.

Traditional and New Types of Passive Flow Control Techniques to Pave the Way for High Maneuverability and Low Structural Weight for UAVs and MAVs

Prevailing utilization of airfoils in the design of micro air vehicles and wind turbines causes to gain attention in terms of determination of flow characterization on these flight vehicles operating at low Reynolds numbers. Thus, these vehicles require flow control techniques to reduce flow phenomena such as boundary layer separation or laminar separation bubble (LSB) affecting aerodynamic performance negatively. This chapter presents a detailed review of traditional passive control techniques for flight vehicle applications operating at low Reynolds numbers. In addition to the traditional methods, a new concept of the pre-stall controller by means of roughness material, flexibility and partial flexibility is highlighted with experimental and numerical results. Results indicate that passive flow control methods can dramatically increase the aerodynamic performance of the aforementioned vehicles by controlling the LSB occurring in the pre-stall region. The control of the LSB with new concept pre-stall control techniques provides lift increment and drag reduction by utilizing significantly less matter consumption and low energy. In particular, new types of these methods presented for the first time by the chapter’s authors have enormously influenced the progress of separation and LSB, resulting in postponing of the stall and enhancing the aerodynamic performance of wind turbine applications

MHD Stagnation Flow of a Newtonian Fluid towards a Uniformly Heated and Moving Vertical Plate

Stagnation flow of an electrically conducting incompressible viscous fluid towards a moving vertical plate in the presence of a constant magnetic field is investigated. By using the appropriate transformations for the velocity components and temperature, the partial differential equations governing flow and heat transfer are reduced to a set of nonlinear ordinary differential equations. These equations are solved approximately using a numerical technique for the following two problems: (i) two-dimensional stagnation-point flow on a moving vertical plate, (ii) axisymmetric stagnation-point flow on a moving vertical plate. The effects of non-dimensional parameters on the velocity components, wall shear stresses, temperature and heat transfer are examined carefully