Burak OĞUL

Article | 2019 | MANAS Journal of Engineering (MJEN)7 ( 2 )

The behaivour of the solutions of the following system of difference equations is examined, x(n+1)=x(n-20)/[1+x(n-2)x(n-5)x(n-8)x(n-11)x(n-14)x(n-17)] where the initial conditions are positive real numbers. The initial conditions of the equation are arbitrary positive real numbers. Also, we discuss and illustrate the stability of the solutions in the neighborhood of the critical points and the periodicity of the considered equations

Canıl İSKAKOVA

Article | 2023 | MANAS Journal of Engineering (MJEN)11 ( 1 )

Maksym is a Kyrgyz ethnic beverage made from milled cereals such as wheat, barley, or maize, boiled in water, and then fermented using yeast and lactic acid bacteria as a starter culture. The aim of this study was to investigate the changes in the consistency and sensory properties of Maksym after industrial production during refrigerated storage. The acidity of the beverage increases and the total soluble solids decrease after 21 days. The amount of lactic acid bacteria (LAB) and yeast after production were 9.36 and 9.46 log cfu/mL, respectively. After 21 days it is indicated that the amount of both starter cultures decreased by 2 . . .log units. In terms of acceptability, the sensory properties after 7 days of storage received the highest rating. However, the acidic taste after 21 days of storage received the lowest rating. Rheological measurements carried out at 5, 10, 20, and 30°C also revealed these changes. Four rheological models (Newtonian, Herschel-Bulkley, Ostwald De-Waele, and Casson) were used to describe the flow behaviour of the beverage. The Casson model was superior to other rheological models. The effective viscosity of Maksym was decreased from 2.66 to 1.96 mPa·s after 21 days of cold storage. The activation energy was decreased from 23.10 and 14.94 kJ/mol and indicated the thinning of viscosity of the beverage. The obtained parameters can be used to predict the shelf-life model and product labelling by its expiry period, as well as to control the quality of Maksym. Keyword: maksym; fermented beverage; rheological properties; microbiology; sensory; storag More less

Dağıstan ŞİMŞEK | Peyil Esengul Kızı

Article | 2018 | MANAS Journal of Engineering (MJEN)6 ( 2 )

In this paper the solutions of the following difference equation is examined

Camilya SMANALİYEVA | Cıldızay ÖZBEKOVA | Asılbek KULMIRZAYEV

Article | 2019 | MANAS Journal of Engineering (MJEN)7 ( 1 )

The objective of this paper was to study the fatty acid composition, and thermal and rheological behavior of Kyrgyz yak (Bos grunniens) visceral fats compared to visceral fats of cow (Bos taurus) and horse (Equus caballus). The result of the studу revealed that the content of saturated fatty acids (SFA) in yak fat was higher than those of unsaturated fatty acids (UFA) (about 58.3 and 38.0 %, respectively). The UFA content in yak fat was higher compared to cow fat (about 27.1 %) and lower than that of horse fat (about 60.0 %). The melting temperatures determined using DSC were found to be 55.18±0.71, 54.98±3.01, 37.60±1.92 °C for yak . . ., cow and horse fat, respectively. These results were close to the solid-liquid transition temperature determined by oscillation rheology (52.20±0.89 °C for yak, 53.56±3.53 °C for cow and 33.7±1.84 °C for horse fat). Rotational rheological measurements at 35 °C have shown that yak fat had shear thinning flow behavior with high a viscosity of 226 mPas compared to horse fat, which has Newtonian flow behavior with a viscosity of about 36 mPas (γ=100s-1). Results on properties obtained in this study will help to understand the contribution of yak fats to the structural properties of new products with these alternative fat sources More less

Ulan BRİMKULOV | Rayımbek SULTANOV

Article | 2015 | MANAS Journal of Engineering (MJEN)3 ( 1 )

Seyyar robotların konum belirleme problemi robotun ortamdaki kendi konumunu bulmaya yönelik çalışmasıdır. Konum belirleme kabiliyeti seyyar ve otonom robotlar için önemli rol oynar çünkü robot amacına ulaşmak için konumunu bilmesi gerekir. Konum belirleme probleminin birkaç türü vardır. En temel problem 'Konum takip etme'dir. Bu durumda robotun başlangıç konumu bilinmektedir ve bir kaç hareket sonrasında robotun konumunu doğrulamaya 'Konum takip etme' denir. Global konum belirleme ise daha zordur, çünkü bu problemde robotun başlangıçtaki konumu bilinmemektedir ve ayrıca robotun hareket ve sensörlerinde hata olabilir. Bu durumda robo . . .t sensör ve hareket bilgilerini kullanarak konumu hakkında farklı tahmin ve ınanç oluşturduktan sonra problemi stokastik yöntemler ile çözmesi gerekir.Bu çalışmada robotun konum belirleme problemini çözen stokastik algoritmalar incelenip birbiri ile karşılaştırılmaktadır. Bunu yapmak için Markov, Kalman ve Monte-Carlo algoritmalar için görsel uygulama yapılarak problemi çözmedeki geçerliliği gösterilmektedir. – Anahtar sözcükler: Seyyar Robot, Konum belirleme, Markov, Kalman, Monte-Carlo, Stokastik yöntemler More less

Ömer AKIN

Article | 2018 | MANAS Journal of Engineering (MJEN)6 ( 2 )

In this paper we have frstly defned a metric in intuitionistic fuzzy environment and studied its properties. Then we have proved that the metric space of fuzzy number valued functions is complete under this metric. We have studied the concept of Aumann integration for intuitionistic fuzzy number valued functions in terms of α and β cuts. We have given the relation between Hukuhara derivative and Aumann integral for intuitionistic fuzzy valued functions by using the fundamental theorem of calculus.

Rita İSMAİLOVA

Article | 2018 | MANAS Journal of Engineering (MJEN)6 ( 1 )

With the development of information and communication technologies, the workflow of many processes has also changed. A scientific publication processes are also facing these changes. Publishing scientific articles is an expensive and time-consuming process that requires significant prior investment and technical expertise. On the other hand, the information systems are subject to updates, and without changes, they can become incompatible with new technologies after some period. In this study, the update of online publication and scientific content management system was analyzed. The system was tested for the quality in use and perfo . . .rmance, as well as to accordance with WCAG 2.0 accessibility checkpoints and user perception. The same tests were conducted after an update. Results of the tests showed that mostly the feature updates affected users’ perception, while improvements of performance higher compliance with accessibility standards had less effect. The further effect of a feature system update, such as menu position and type of implementation, were observed. The design allows to manage several journals. Moreover, the design allows adding new journals to the system as well. The publishing process in a system is article based. Unlike the previous version, the system stores an article metadata and can work with .pdf format. In addition, in this study we consider the requirements that need to be met by a publishing softwar More less

Mustafa Alp ÇETİN | Rita İSMAİLOVA

Article | 2019 | MANAS Journal of Engineering (MJEN)7 ( 2 )

When learning languages, writing an essay is one of the main methods for assessing students’ knowledge. However, with the development of ICT, language learning is also being transferred to online platforms. At the same time, as the number of students’ increases, the problem of evaluating students’ essays arises. In this paper, we offer an automated system that facilitates instructors while evaluating students’ essays. Currently, the system works for essays written in Turkish. The system was built using the Zemberek library. It allows one to extract text features the essay of several people at the same time on several indicators, nam . . .ely, morphological analysis, vocabulary, the use of different language structures, etc. Currently, many automated essay grading tools are proposed, and one of the main factors that defined their accuracy it the extraction of text features. Thus, as further work, it is planned to use the data obtained using this essay assessment system together with instructors’ evaluation to create an expert system for automatic essay evaluation using machine learning techniques More less

Mehmet TEKEREK | Cumagül Nurakun Kızı

Article | 2013 | MANAS Journal of Engineering (MJEN)1 ( 1 )

This paper describes efforts underway to construct a Scientific Publication Content Management System (SPCMS) with Peer Review Tools (PRT) for Academic Institutions. Firstly, known Scientific Publication processes have been reviewed and online publication process was chosen as a model for developing a scientific content publication and management system. Next, the developed system will be implemented as a case study to Kyrgyzstan - Turkey Manas University scientific journal publication system. Since it is aimed to construct an online only journals, the system is supposed to be fast-tracking, fully manageable and, on the other hand, . . .it should be highly secure since all the manuscripts are to be stored on the system. To undertake such problems as fast tracking, speedy data processing and security was decided to implement self-developed system by using PHP and AJAX programming on Apache server with MySQL data base application.The result of this research is an automated publishing system for scholar manuscript publications, from submission through peer review, aggregate, manage and publish university journals, utilizing a single, dynamic destination. - Keywords: Online Scientific Publication, Content Management Systems, Peer Review Tool More less

İsmet ALTINTAŞ

Article | 2021 | MANAS Journal of Engineering (MJEN)9 ( 2 )

This paper is a work on elementary soft (𝜖-soft) compact spaces. We first define the cofinite 𝜖- soft compact space and prove that the image of an 𝜖-soft compact space under a soft continuous mapping is 𝜖-soft compact space. We then examine the relationship between 𝜖-soft compact space and classical compact space and give an illustrative example.

Burak OĞUL

Article | 2020 | MANAS Journal of Engineering (MJEN)8 ( 2 )

In this paper, given solutions fort he following difference equation x(n+!) = x(n-14) / [1 + x(n-2) x(n-5) x(n-8) x(n-11)] where the initial conditions are positive real numbers. The initial conditions of the equation are arbitrary positive real numbers. We investigate periodic behavior of this equation. Also some numerical examples and graphs of solutions are given.

Elman HAZAR

Article | 2015 | MANAS Journal of Engineering (MJEN)3 ( 2 )

В рамках трехмерной линеаризированной теории устойчивости в случае неоднородных начальных напряженных состояний рассмотрены задача устойчивость и решен с помощью вариационных методов. Полученные результаты достаточно удовлетворительно соответствует точным решениям упругих и упруго-пластических задач при неоднородных пластических деформациях. - Ключевые слова: устойчивость, упруго-пластических, реологических, полость, критическая нагрузка = Stability problems for cases with unhomogenous initial tensions have been studied and solved in the fromework of Three dimensionel stability theory using variationel metod. Results of the elasti . . .k-plastik problems for homegenous plastik deformations are in reasonable agremeent with each other. – Keywords : Stability, elasto - plasticity, rheology, space critical force More less