bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Spray Drying Process for Food Bioactive Compounds
Authors: Akca Emine Erdağ , Çağındı Özlem , Köse Ergun
Published: August 2023

In addition to the essential nutrients found in the structure of foods, some compounds that have positive effects on health are gradually taking their place in nutritional recommendations. Food-derived bioactive are known as these non-nutritional compounds and are secondary metabolites of plants consisting of vitamins, minerals, fatty acids, phytosterols, polyphenols, anthocyanins, carotenoids, probiotics, and bioactive peptides. There are difficulties in ensuring the stabilization of bioactive compounds that have positive effects on human health during production, product, and storage periods. Encapsulation techniques are used to preserve these compounds from decreased biological activity, interaction with environmental conditions, physicochemical and organoleptic adverse effects. Micro and/or nanoencapsulation are an effective method that increases the stabilization of bioactive food compounds and enables their use in food systems. Among encapsulation technologies, spray drying, which is cost-effective, is one of the most frequently used methods for micro- and nano-sized encapsulation of different bioactive compounds, especially for the encapsulation of heat-sensitive compounds. The aim of this study was to provide an overview of the micro/nanoencapsulation of food-derived bioactive compounds by spray drying with different encapsulation agents and to investigate oxidative stress, temperature effect, storage stability, bioavailability as well as the advantages and disadvantages of this method..
Hazır Yemek Sektöründe Sürdürülebilirlik
Authors: Akca Emine Erdağ , Dedeoğlu Mustafa , Savlak Nazlı
Published: August 2023

Son on yılda sürdürülebilirlik kavramının hem bilim insanları tarafından araştırma konusu olarak hem de uygulamaya dönüştürülmesi alanında yapılan girişimler yoğunluk kazanmıştır. Gıda endüstrisi de sürdürülebilirlik endişesinin büyük bir paydaşı olarak söz konusu girişimlerin odak noktasında yer almaktadır. Günümüzde tüketicilerin de bir gıda materyalini satın alma veya bir yemeği tüketme davranışları üzerinde sürdürülebilir de etkili olmaya başlamıştır. Gıda firmalarının müşterilerine iyi bir tadın yanı sıra, daha az kimyasal katkı, çevre dostu gıda, sürdürülebilir menüler ve çevreye duyarlı girişimler sunmaları onları avantajlı konuma getirmeye başlamıştır. Dünya nüfusun ev dışı yemek tüketim alışkanlığında artan eğilim hazır yemek sektörünün gıda pazarındaki payını zamanla artırmaktadır. Bu sebeple hazır yemek sektörleri hem üretim hem de tüketim tarafında sürdürülebilirliği sağlamak için benzersiz bir konumda yer almaktadır. Bu çalışmada gıda sektörünün ana üretim ve tüketim kollarından birisi olan hazır yemek sektörünün faaliyetlerinin çevresel, sosyal ve ekonomik boyutları sürdürülebilirlik açısından incelenmiştir.
Dairy Protein vs. Plant Protein and Their Consumer Perception
Authors: Tirtom Sena , Akpınar Aslı
Published: August 2023

Proteins are crucial macronutrient for human health. Animal, dairy, and some plant proteins are considered high-quality proteins that provide health and metabolic benefits based on the digestible levels of essential amino acids they contain. Animal protein is rich in many essential amino acids, but excessive animal protein intake greatly increases fat intake. Therefore, due to the improvement in people's living standards and increase in protein intake, the animal protein supply is not sufficient to meet the increasing demand of people. Technologically, milk proteins are the most important component of milk due to their unique properties that allow milk to be converted into a wide range of products such as cheese or yoghurt quite easily. It is widely accepted that dairy products are excellent sources of highly digestible essential amino acids. Nowadays, plant protein is preferred because has advantages such as it is an abundant source, cheap, easy to obtain, preferred by special consumer groups such as vegan/vegetarian, does not contain cholesterol and preventing diseases. In the last decades, the increasing interest of both producers and consumers in plant proteins and the decrease in animal protein intake and inclination to plant protein intake with the innovations in the markets emphasize the importance of these alternative sources. In this review, information is given about the importance of milk proteins and plant proteins and the role they play in consumer preference is mentioned.
Alagöl Gölü Değişiminin Uzaktan Algılama ile Haritalanması
Authors: Abdrakhmanova Altynay
Published: August 2023

Bu çalışmanın temel amacı, Alagöl Gölü'nün kıyı şeridinin yıllar içindeki konumsal değişimlerini uzaktan algılama yaklaşımları kullanаrak analiz etmektir. Bu amaç doğrultusunda üç adet Landsat 5 ve Landsat 8 uydu görüntüleri çalışmanın uygulаma safhasında kullanılmıştır. Bu çalışmаdа Alagöl Gölü’nün alanındaki ve kıyı şeridindeki değişimin olası nedenleri araştırılmıştır. Gölün kıyı şeridi değişimleri, çok zamanlı uydu görüntüleri ve uzaktan algılama teknikleri kullanılarak belirlenmiştir. 1993, 2009 ve 2018 yıllarına ait Landsat 5 ve Landsat 8 uydu görüntüleri kullanılmıştır. Gerekli geometrik düzeltmeler yapıldıktan sonra, gölün kapladığı alan ve kıyı şeridinin belirlenmesi için kontrollü sınıflandırma yöntemleri veri setine uygulаnmıştır. Sınıflandırmа uygulamasının dışında ayrıca modifiye normalize fark su indeksi de kullanılmış ve elde edilen görüntüler daha sonra CBS ortamında sayısallaştırılmıştır. Son olarak 1993-2018 yıllarında gölün kıyı şeridi değişimleri tespit edilmiştir.
Impact of Foreign Direct Investment on Poverty in Ghana: A Johansen Co-integration Analysis
Authors: Muntaka Abdul Rahman Mohammed , Oyebamiji Oluwaseun Adeoye , Adeniyi Abiola
Published: August 2023

In the past years, Ghana has witnessed a significant increase in Foreign Direct Investment which is expected to translate into transformative growth that reduces poverty and inequality; however, the country’s poverty and income inequality profile remain high. Foreign direct investment (FDI) and poverty research are important because FDI can have both positive and negative effects on poverty levels in host countries [1]. The positives imply that FDI can bring in capital, technology, and job opportunities, which can help reduce poverty by boosting economic growth and raising people's living standards. On the other hand, FDI can displace local businesses, exacerbate income inequality, and have environmental consequences that harm the poorest members of society. Understanding the relationship between FDI and poverty can assist policymakers and businesses in making informed decisions that promote inclusive and sustainable economic growth and reduce poverty. This study investigates the impact of FDI on poverty in Ghana using a 29-year data set from (1990 to 2018). Analysis was done using the Johansen Cointegration technique. The literature informed the variables used for this study. The Gini coefficient (which serves as a proxy for poverty and its parts of the FGT poverty indices family), foreign direct investment (FDI), GDP per Capita, exchange rate, trade openness, and inflation rate were all cointegrated. The results of the study showed that FDI, GDP per capita, inflation rate, and exchange rate widen the income inequality gap, hence, increasing the poverty incidence. In contrast, an increase in trade openness reduces the Gini coefficient implying a reduction in income inequality and poverty.
A Review of an Eleventh Order of Chebyshev–Halley Type Method for Solving Nonlinear Equations
Authors: Raba Bana Ali , Dal Fadime
Published: August 2023

In this paper, we present a new eleventh order method for solving nonlinear equations numerically. This method is based on the methods of Chebyshev and Halley methods and requires five function evaluations (two function calculations, two first derivative calculations, and a second derivative calculation). Therefore, the efficiency index of this method is √11 5 = 1,615. The numerical comparisons made also show that the method of this article has good efficiency.
Engineering Applications of Polynomial Matrix Method: A Review
Authors: Çevik Mehmet , Sezer Mehmet
Published: August 2023

The modeling of natural phenomena is based on ordinary and partial differential equations, which appear in all branches of science and engineering. For this reason, applied mathematicians and engineers have tried to develop new methods of solutions to these equations. One of the widely used numerical methods for the solution of ordinary and partial differential, integro-differential, and integral equations is the Polynomial Matrix Method (PMM). In this study, these methods are introduced first and then a brief history of the development of the method is given. Almost 30 polynomials used in this collocation approach are mentioned. Fundamental principle of the PMM is explained. Engineering applications such as in single and multi-degree of freedom systems, mechanical vibrations, heat equations, diffusion equation and others are reviewed.
New Polygonal Numbers Identity by using Animation Proof Technique
Authors: Sarp Ümit
Published: August 2023

Polygonal numbers are a special set of numbers that arise in geometry, specifically in the study of polygon shapes. These numbers have a rich history in mathematics and continue to be an area of active research and investigation in various mathematical disciplines. In this study, a brief introduction to the two-dimensional figurated numbers known as polygonal numbers is provided. Then a new polygonal numbers theorem about them is proved by using animation proof technique.
Auxetic Thin-Walled Square Tubes Subjected to Oblique Loading
Authors: Yolcu Dilek Atilla , İlgen Fatih , Baba Buket Okutan
Published: August 2023

The use of auxetic structures with a negative Poisson’s ratio in thin-walled tubes, which are widely used in many fields, is one of the topics discussed recently. This is because re-entrant auxetic tubes are generally more resistant to loads such as compression and impact than conventional honeycomb structures due to their high indentation resistance. However, there is limited information in the literature regarding the use of these structures on different sides of the thin-walled tube. In addition, there are few studies on how the compressive behavior of the re-entrant auxetic structure changes when subjected to an oblique load. In this study, the effect of oblique loading on thin-walled square tubes with re-entrant and traditional honeycomb structures on the sides was investigated numerically. The side faces of the tubes were designed using auxetic re-entrant and conventional honeycomb cells with constant ligament properties. Four different types of square tubes were created with the designed re-entrant auxetic and conventional honeycomb side faces. These structures are; all side faces re-entrant (RRRR), all side faces honeycomb (HHHH), opposite side faces re-entrant-honeycomb (RHRH), and adjacent side faces re-entrant-honeycomb (RRHH). Oblique loads were applied to the edges and corners of these structures and their behavior was examined. The results showed that the use of different lattice structures on the thin-walled tubes significantly affected their behavior.
Torque Vectoring on Front Wheel Drive Vehicle with Hub Motors
Authors: Doğru Abdulhamid Han , Yildirim Buse , Umutlu Rafet Can
Published: August 2023

Nowadays electric vehicles (EVs) which are equivalent to fossil fuel vehicles and run on more environmentally friendly fuels, have become popular in the automotive industry. So EVs have very common use areas in that field. Driving stability and safety are also of great importance in these widely used vehicles. In this sense, torque vectoring (TV) appears as the most modern approach.TV control systems provide the distribution of torque to the wheels by the effect of the yaw moment. The application of torque vectoring in vehicles reduces power losses in the motor driver and the vehicle’s power consumption. Using efficient torque vectoring algorithms for electric vehicles, this research describes existing and emerging vehicle technology related to yaw moment management and traction control. The article provides the allocation of wheel torques for a two-wheel drive all electric vehicle with individually controlled engines. Lateral dynamics and moment dynamics were used in the construction of this torque allocation. In addition, the lateral velocity and yaw rate of the vehicle related to the specified inputs were calculated from the nonlinear front wheel drive vehicle model which was designed by MATLAB. The reference yaw rate and the yaw rate, which is the output of the system, were compared and the error in between and the Proportional Integral Derivative (PID) controller were fed. The hub motor, which is widely used in electric vehicles and is easy to control, was used as the engine in the system. While increasing the control on this vehicle, the designed torque vectoring system also increased the stability and driving performance during turning.
Experimental Investigations on the Thermal Performance of an Office-Type Heat Recovery Ventilation System
Authors: Güngör Sahin , Sabancı Veli
Published: August 2023

Considering the global energy crises and climate change, the importance of energy recovery grows day by day. At this point, heat recovery ventilation (HRV) systems contribute energy saving by the help of heat exchange in between the cold and hot air streams. Furthermore, the Covid-19 pandemic shows us that ventilation is an inevitable part of heating, ventilation, air-conditioning and refrigeration (HVAC-R) systems to satisfy indoor air quality within the subregions of human-living constructions. In this experimental work, we use an industrial HRV system to examine the thermal performance under various air flow rates. The HRV unit mainly contains cold and hot stream fans, crossflow heat exchanger, air filter, and flow rate controller. The thermal scenarios are considered under winter climate conditions; therefore, temperature levels of the fresh and exhaust air streams are determined about 280K and 300K, respectively. In addition, thermal investigations are conducted with different mass flow rates. The temperatures are measured via thermocouples and collected by a precise multi-channel data logger. The results indicate that the investigated HRV system contribute both indoor air quality (complies with ASHRAE 62.1 standard) and reduction of air conditioning energy consumption.
Quasi-Static Punch Shear Responses of Glass/Epoxy Composites Reinforced with Pinecone upon Immersion in Acidic and Basic Solutions
Authors: Kandaş Halis , Özdemir Okan
Published: August 2023

Nowadays, vehicles that are equivalent to fossil fuel vehicles and operate with more environmentally friendly approaches are becoming popular in the automotive industry. Electric vehicles (EV), which is one of these approaches, have very common usage areas in this field. Driving stability and safety are also of great importance in these widely used vehicles. In this sense, torque vectoring (TV) appears as the most modern approach. TV control systems provide the distribution of torque to the wheels by the effect of the yaw moment. The application of torque vectoring in vehicles reduces power losses in the motor driver and the vehicle’s power consumption. Using efficient torque vectoring algorithms for electric vehicles, this research describes existing and emerging vehicle technology related to yaw moment management and traction control. The article provides the llocation of wheel torques for a two-wheel drive all electric vehicle with individually controlled engines. Lateral dynamics and moment dynamics were used in the construction of this torque allocation. In addition, the lateral velocity and yaw rate of the vehicle related to the specified inputs were calculated from the nonlinear front wheel drive vehicle model which design by MATLAB. The reference yaw rate and the yaw rate, which is the output of the system, were compared and the error was given to the PID controller as an input. Torque producer of the system is a hub motor, which is popular in electric vehicles and simple to control. While increasing the control on this vehicle, the designed torque vectoring system also increased the stability and driving performance during turning.
Experimental Analysis of Auxetic Structures with Different Cell Parameters under Uniaxial Compression
Authors: Yolcu Dilek Atilla , İlgen Fatih , Baba Buket Okutan
Published: August 2023

The structures at varying operating conditions are exposed to loads that can lead to damage. One of the structural loads that cause damage is compression load. However, such loading causes different effects on auxetic structures having the negative Poisson's ratio. Since these structures contract under compressive loads, they exhibit higher indentation resistance than conventional cellular structures. In this study, the effects of changing the ligament length and ligament angle in auxetic re-entrant structures under uniaxial compressive loading were experimentally investigated. The auxetic re-entrant structures were fabricated from PLA material by a three-dimensional printer using fused deposition method. The tests were performed under quasi-static uniaxial compression load and the test was continued until the indentation point. As a result of the tests, shrinkage of the cross-section was observed, and it was revealed that there is an inverse relationship between the ligament length and the maximum compressive load. In addition, it was clearly observed that the maximum compression load increased as the angle increased for the maximum ligament length.
Natural Fibers in Uganda Suitable for Sustainable Natural Fiber Reinforced Composites
Authors: Mugarura Isaac , Çevik Mehmet
Published: August 2023

The use of natural fibers in composite polymers has grown rapidly and has gained popularity in various areas. Most of these natural fibers can also be found in Uganda. Many sectors are currently shifting to “green technologies” that are environmentally friendly in order to reduce synthetic plastic wastes and pollutions. Natural fibers are at low-cost with high specific properties and low densities. Based on these factors, most developing countries already begun using natural fibers to produce good quality products that are effective and economical. Countries like Uganda are the future source of many known and many unknown natural fibers. One of the uses of natural fiber reinforced composites is the automotive industry; Uganda is a promising country in this sense. In this study, we will review the natural fibers in Uganda suitable for natural fiber reinforced composites. These are, namely, mutuba tree (ficus natalensis), rice and coffee husk, cotton, Sansevieria trifasciata, banana fibers, sisal fibers, marsh grass and bamboo fibers. These plants are found in many other countries; however, a combined investigation is presented in our study. These fibers are mainly used in textiles, automotive industry, and lightweight items. Their future use as structural parts of low to medium strength are evaluated.
Compression after Impact Behavior of S2-Glass Reinforced Composite Plates at Low Temperatures
Authors: Karakuzu Ramazan , Kandaş Halis
Published: August 2023

Composite materials are used in a wide variety of applications due to their durability, high mechanical strength and low weight. As a result, they have application in several industrial areas. The automotive, marine and aerospace industries are a few of these sectors. Glass fibers are the most often implemented reinforcement material in composites because of their lower cost and greater strength compared to other types of fibers. They can be employed with ease in the aircraft industry due to their high degree of thermal resistance. These aspects have led to many researchers on S2-glass composites. There are gaps in the literature despite the fact that there have been numerous studies on this topic. In this study, the vacuum assisted resin infusion method (VARIM) was used to manufacture S2- glass/epoxy composites with 18 layers. Firstly, pre-curing was carried out during the production process at 50 °C for 30 minutes, followed by an 8-hour curing process at 80 °C. After production, the composite material was cut into 100 mm x 150 mm sized specimens. Impact test was performed at room temperature with the Ceast 9350 Fractovis Plus impact test machine for different impact energies. Then, Compression after impact (CAI) tests were conducted at low temperatures for impacted and unimpacted specimens to assess influence of impact damage on the residual compressive strengths of the composite plates by Universal Shimadzu testing machine according to Boeing CAI fixture (ASTM D 7137). Impact behavior and the effect of low temperature on the CAI strength of S2-glass/epoxy composite plate were investigated.
Dynamic Compressive Behavior of Glass/Epoxy Composites Using Split Hopkinson Pressure Bar
Authors: Al-Shamary Aidel Kadum Jassim , N. Abed Abdul Rahman , Karakuzu Ramazan
Published: August 2023

In this study, E-glass/epoxy composites were subjected to Split Hopkinson Pressure Bar (SHPB) tests to obtain the compressive properties of composite under the different strain rate values. Composite materials were manufactured by vacuum assisted resin infusion moulding (VARIM) method. Then cylindrical SHPB specimens with 6 mm diameter and 6 mm height were obtained by cutting the composite with water jet through the thickness. E-glass/epoxy specimen was connected to the SHPB test apparatus. The variation of strain according to time was obtained by using axial strain-gage. Then compressive stresses were calculated by using strain values, the modulus of elasticity and the area of the pressure bar, and the area of specimen. The variations of engineering stress according to the engineering strain and time, and engineering strain rate vs time were obtained under different velocities or strain rates. The results shows that velocity or strain rate has a significant effect on compressive properties of E-glass/epoxy composite.
A Case Study on PV-Aided Net Zero-Energy Building: the Daycare in IKCU
Authors: Djana Loic Rebnodji , Gungor Sahin
Published: August 2023

At the core of our growing societies, energy supply stands as one of the major concerns today, and it will be an inevitable challenge for our near future. As the nations are looking to find solutions for the transition from fossil fuels – depleting at a high rate – to alternative energy sources, solar energy through PV cells is getting attention as an affordable and easily implemented option especially for power supply in commercial and residential buildings. This work consists in analyzing the possibility to cover the entire energy needs of a building via PV solar cells for the case of a constructed daycare. In this case study, HVAC energy requirement has been calculated by the TS825 standard. The standard specifies a method for calculating the net heating/ventilation energy need and provides the rules for calculating the maximum allowable temperature in buildings. First, dimensions of the investigated building are taken and characteristics affecting the thermal insulation are assessed. Then, other energy needs, mainly lighting and electrical devices, are computed in the analysis as internal electricity needs. The scope of this work extends to the assessment of indoor air quality for occupants of building, which is an important aspect in our case study where the occupants are children. ASHRAE standards 62.1 is utilized for this purpose. The standard specifies minimum ventilation rates and other measures intended to provide acceptable indoor air quality to human occupants and that minimizes adverse health effects. The results are obtained for monthly varying solar exposition in the specified area where the building is located to provide supply for the determined energy demand via solar energy. Finally, monocrystalline PV panel system has been proposed with proper orientation and adequate power potential. Based on the obtained results, as well as the economical aspect, inferences and suggestions are made for improvement.
Optimization of Oxidation Time During Graphene Oxide Production
Authors: Kanbur Kürşat , Birlik Işıl , Sargin Fatih , Ak Azem Funda , Türk Ahmet
Published: August 2023

Graphene oxide (GO) consists of one or several stacked graphene structures equipped with various functional groups. It has applications in many areas such as biomaterials, energy storage. sensors and photocatalytic degradation thanks to its high surface area, adjustable band gap and dispersibility in various solvents. Although there are various production techniques for GO synthesis, Improved Hummer’s Method stands out with its high efficiency and controllable production parameters. In this method, graphite is oxidized after intercalation with various acids and GO is obtained by exfoliation in the next stages. The effects of production parameters such as oxidation time, oxidant type, oxidant amount, drying processes are generally investigated in Hummer's method. In this study, the effect of oxidation time on GO structure was investigated. In this context, GO was synthesized with various oxidation times by using Modified Hummer's Method. Then, the structural and optical properties of GO were investigated by X-Ray diffraction (XRD), Fourier-Transform infrared spectroscopy (FTIR) and UV-Visible Light spectrophotometer (UV-Vis). The results showed that there is an optimum oxidation time for the oxidation degree of GO structure.
Photocatalytic Performance of 3D Printed Polymer Composites: Effect of Matrix Material
Authors: Özler Berk , Güler Saadet , Yavaş Ahmet , Yıldırım Serdar
Published: August 2023

Additive manufacturing has started to be used in many sectors today (e.g. aerospace, dentistry, biomaterials, drug industry) and is still a developing material production method. Three-dimensional (3D) printers are the main devices used in this method, which enables production without the need for molds. These 3D printers are divided into mechanical, electrical and photochemical types. Photosensitive resins are used for production in photochemical three-dimensional printers. These resins contain monomer, oligomer, photoinitiator and optionally filler material. The change of monomer, oligomer, and filler materials in the structure also affects various characteristics of the obtained polymer including mechanical, electrical, magnetic, and photochemical roperties. To the extent of our literature review, it has been determined that there are not enough studies on the effect of the change in the matrix material of the polymer matrix composite materials produced with 3D printers on the photocatalytic performance. With this motivation, in this study, the photocatalytic performance of composite samples obtained by the incorporation of nano-sized TiO2 particles(1.5 wt.%) into two different acrylate-based resin mixtures was compared. Bisphenol-A glycidyl dimethacrylate (bis-GMA) and urethane dimethacrylate (UDMA) based monomers were used as matrix material, and triethylene glycol dimethacrylate (TEGDMA) was used as the diluent. TiO2 nanoparticles and photoinitiator were added into the prepared mixtures and mixed in a magnetic stirrer until a homogeneous mixture was obtained. Then, polymer samples were obtained by printing the resins with a 3D printer in 20x35x3 mm dimensions. The photocatalytic activity of the obtained polymers under visible light irradiation was tested. Experimental results revealed that even a small amount of TiO2 is effective in imparting photocatalytic activity to the structure, and besides, the effect of bis-GMA-based matrix material on photocatalytic performance is more pronounced than that of UDMA-based matrix material.
A Comprehensive Analysis of Urban Heat Island Determination Methods
Authors: Sütçüoğlu Gökçe Gönüllü , Önaç Ayşe Kalaycı
Published: August 2023

Population density in urban centers causes an increase in the amount of construction and energy consumption. In addition to being the areas where human activities that cause climate change are most intense, cities are also the areas where the negative effects of climate change are observed most intensely. One of the most obvious effects of climate change observed in urban areas is the formation of urban heat island, which occurs due to reasons such as the increase in the number of structural areas and impermeable surfaces, the amount of energy consumption, the number of vehicles and people, the decrease in open green areas, and the lack of planning to increase the ecosystem service quality in the planning of these areas. While the formation of urban heat island negatively affects the thermal comfort of the citizens in the summer months, it also increases the amount of energy used for cooling indoors, and this situation causes a vicious circle when the directly proportional relationship between energy consumption and heat island formation is considered. Urban heat islands have been the subject of many different occupational disciplines, and various methods have been tried for the determination of heat island formation. In this study, different methods used in urban heat island determination studies were examined, the accuracy of the applied methods in the context of the study area scale, and the advantages and disadvantages of each method were discussed comparatively, considering today's technological possibilities.
Evaluation of User Experience of Indoor Display in Virtual Reality (VR)
Authors: Karcı Ahenk , Önaç Ayşe Kalaycı
Published: August 2023

Housing is one of the most essential needs of humanity since the beginning of existence. The discipline of architecture has emerged and developed based on this need and has continued to evolve with the advancement of civilization and technology. When looking at the history of architecture, it can be seen that the visualization of architectural design has a long history. Nowadays, with the parallel development of computer technologies, architectural visualization techniques have also greatly advanced. Virtual reality (VR) technology is used in many sectors such as education, health, and entertainment today. The discipline of architecture enables designers to visualize their designs in a realistic way. Especially in the architecture field, where isualization is very important, the use of this technology is crucial in increasing the realism of the user's experience in the design phase. VR is a developing and wide-spreading technology in the field of architecture these days. Although there are studies on this subject in literature, studies which are examining the effect of VR technology in architectural visuals on people's sense of reality and feelings about the VR experience are limited. The aim of this study is to help fill the gap in this subject of iterature. The main purpose of this study is to investigate the experience and reality sense of architectural design visuals’ aterials, light and shadow, outdoor view, indoor plants, furniture, objects, and participants’ feelings of provide through the use of virtual reality (VR). In this context, the use of VR technology in architecture was examined first. Later, a three-dimensional interior space environment designed was visualized using computer techniques and experienced by users through a VR headset. In the study, the participant's feelings about the VR experience and their thoughts on the realism of the experience were revealed through the prepared survey questions.
Sponge City Based on Blue – Green Urbanism
Authors: Gündel Hande , Önaç Ayşe Kalaycı
Published: August 2023

Blue-Green Infrastructure systems are essential and valuable solutions for urban and rural areas which are facing climate change problem. As climate change negatively affects vegetation systems, water systems, and life cycles, blue-green infrastructure solutions enhance the urban and rural landscape. The system combines the green and water networks and also manages stormwater. BGI develops a variety of urban ecological, economic, social functions, and also urban sustainability and liveability. In addition to these, the systems decrease the need of grey infrastructure and the negative impacts on urban ecology. BGI plays a specific role on development of stream and coastal systems, and also urban green areas. The system emphasizes the protection of hydrologic system and hydrodynamic processes, accordingly, water management systems which consist of rain gardens, green roofs, vertical greening systems, and permeable pavements are used. In the scope of the study, creation of Sponge City with Blue-Green Infrastructure systems and the construction processes are scrutinized. In connection with the idea, sponge city design tools are described.
Green Biosynthesis of Silver Nanoparticles from Wild Mushroom (Ganoderma lucidum) First Time in Iraq
Authors: Sadiq Shadman Tariq , Sulaiman Sara Qahtan
Published: August 2023

Nowadays there is an increasing interests about nanoparticle due to its application in medical and industrial products, green rout and safely producing of nanoparticles consider important for recent life technology, silver nanoparticles (AgNPs) one of the most safe compound to human and environment due to its low effect an low toxicity even with direct contacting and consuming release low particles of silver, for these reasons , the availability and low costing technology we produced silver nanoparticles from eco-friendly mushroom G. lucidum first time in Iraq. AgNPs were prepared by using aqueous extract of G. lucidium as a reducing agent for silver nitrate (AgNO3). The characteristics of silver- anoparticles were determined, including: Determining the highest absorption of silver nanoparticles by UV-VIS spectrophotometer, the shape and size of silver nanoparticles by atomic force microscopy (AFM), as well as determining the type of chemical bonds or functional groups bound to the prepared AgNPs by Fourier-transform infrared spectroscopy-FTIR. Scanning Electron Microscopy used for study of Particle size and shape. The results showed the emergence of a spectral imaging beam using a spectrophotometer that ranged between 350-900 nm, where the best absorption beam was at a wavelength of 450 nm, while the result of AFM showed the surface topography of silver nanoparticles with an average size of 62.78 nm. FTIR spectrum revealed strong absorption peaks 1091-3434 cm-1, as well as their role in the stability of these molecules. The size of spherical particles ranged between 17.15 - 25.81 nanometers under SEM.
Havacılık Sanayiinde Kullanılan Bir Parçanın Alüminyum Alaşım ve Karbon Fiber Takviyeli Kompozit Malzeme Mukavemet Analizi
Authors: Kaya İlteriş , Çevik Mehmet
Published: August 2023

Modern uçak gövdelerinin en az yüzde 30-40'ı artık fiber takviyeli polimer kompozit malzemelerden yapılmaktadır ve bu alandaki teknolojik gelişmeler nedeniyle bu oran hızla artmaktadır. Bu çalışma, polimer kompozitlerin havacılık endüstrisindeki kullanımlarını ve sonlu elemanlar metodu ile yapılan karşılaştırmalı bir mukavemet analizini içermektedir. Çalışmamızda, F-16 savaş uçaklarında hâlihazırda kullanılmakta olan ana iniş takımı FS 341.80 kodlu alüminyum alaşımlı yapısal parçasının geometrik yapısı, ağırlığı ve maruz kaldığı kuvvetler ile sınır şartları tespit edilmiştir. Mevcut parçanın, zorlu bir iniş senaryosu durumunda maruz kaldığı kuvvetlere göre sonlu elemanlar analizi ANSYS yazılımı ile yapılmıştır. Ardından, aynı parçanın karbon fiber takviyeli kompozit malzemeden sonlu eleman modeli oluşturulmuştur. Önceki senaryoda uygulanan yükleme durumu yeni modele de uygulanmıştır. Her iki malzeme ile oluşturulmuş modellerdeki eşdeğer gerilme, eşdeğer toplam gerinim, maksimum kayma gerilmesi ve toplam deformasyon değerleri sayısal olarak hesaplanmıştır. Her iki malzeme için elde edilen sonuçlar karşılaştırılmıştır. Karşılaştırma sonucunda aynı yükleme ve sınır şartları için kompozit malzemede eşdeğer gerilme değerlerinde, eşdeğer toplam gerinim değerlerinde, maksimum kayma gerilmesi değerlerinde ve toplam deformasyon değerlerinde azalma olduğu görülmüştür. Bunun yanında parçanın toplam ağırlığında da azalma sağlanmıştır. Bu gelişmenin, uçağın ağırlığı azaltmanın yanında yorulma ömrünü ve bakım süresini de uzatması beklenmektedir.
Phát triển năng lực giải quyết vấn đề toán học cho học sinh lớp 10 qua dạy học giải bài tập phương trình quy về phương trình bậc hai
Authors: Võ Xuân Mai , Tô Quốc Lộc
Published: August 2023

Theo Chương trình Giáo dục phổ thông môn toán năm 2018, năng lực giải quyết vấn đề toán học là một trong những năng lực thành tố quan trọng của năng lực toán học cần hình thành và phát triển cho học sinh. Nhiều nhà giáo dục trong nước đã quan tâm nghiên cứu đề xuất các cách thức khác nhau nhằm phát triển năng lực giải quyết vấn đề toán học cho học sinh trong dạy học toán. Trên cơ sở các nghiên cứu đó, bài viết đề cập các biểu hiện của năng lực giải quyết vấn đề toán học đối với học sinh trung học phổ thông, từ đó đề xuất một số biện pháp phát triển năng lực giải quyết vấn đề toán học cho học sinh qua dạy học giải bài tập phương trình quy về phương trình bậc hai (Toán 10).
Vận dụng phương pháp mô hình hóa trong dạy học khái niệm toán học
Authors: Trần Thị Bích Hòa
Published: August 2023

Bài báo đề xuất phương pháp mô hình hóa vận dụng vào dạy học các khái niệm trong toán học dựa trên cơ sở lý thuyết về mô hình hóa được các nhà nghiên cứu đưa ra để nghiên cứu các đối tượng toán học nói chung. Để minh họa rõ phương pháp mô hình hóa, bài báo trình bày một trong số những bài giảng trong học phần Đại số tuyến tính được giảng dạy cho sinh viên ngành Công nghệ thông tin, Trường Đại học Công nghệ thông tin và Truyền thông Việt-Hàn, qua đó khẳng định tính hiệu quả của phương pháp dạy học này.
Thực trạng dạy học môn Khoa học tự nhiên của giáo viên trung học cơ sở ở vùng Đồng bằng sông Cửu Long
Authors: Huỳnh Thị Thúy Diễm , Đinh Minh Quang , Nguyễn Quyền Trân
Published: August 2023

Nghiên cứu cung cấp thông tin về thực trạng dạy học môn Khoa học tự nhiên của giáo viên trung học cơ sở ở vùng Đồng bằng sông Cửu Long. Nghiên cứu này được thực hiện theo mô hình nghiên cứu điều tra cắt ngang với sự kết hợp của cả hai hình thức nghiên cứu định lượng và định tính. Kết quả nghiên cứu cho thấy đa số giáo viên trung học cơ sở đều đã trải qua tập huấn 4 modul chủ chốt: hướng dẫn thực hiện Chương trình Giáo dục phổ thông 2018, về sử dụng phương pháp dạy học và giáo dục, về kiểm tra, đánh giá học sinh, và về xây dựng kế hoạch dạy học và giáo dục theo hướng phát triển năng lực với tỷ lệ tham gia rất cao 92,63%. Tuy nhiên, giáo viên trung học cơ sở gặp rất nhiều khó khăn khi thực hiện việc dạy học môn Khoa học tự nhiên ở các lĩnh vực là cơ sở vật chất (16,81%), sách giáo khoa mới (14,29%) và việc xây dựng kế hoạch bài dạy (13,45%), Phương pháp và kỹ thuật dạy học (12,61%), Đối tượng người học (8,4%), Nội dung kiến thức dạy học và kỹ năng tổ chức các hoạt động dạy học (7,56%), Kiểm tra đánh giá (5,04%).
Liên kết tiêu thụ làm gia tăng lợi tức cho nông dân: trường hợp trồng lúa nhật tại tỉnh An Giang
Authors: Trần Thị Mỹ Phượng , Lê Cảnh Dũng
Published: August 2023

Lúa Nhật được trồng tại tỉnh An Giang trong các năm gần đây phục vụ xuất khẩu sang thị trường có thu nhập cao và chuyên biệt. Nghiên cứu này nhằm đánh giá lợi tức người nông dân thu được từ việc trồng lúa Nhật, đặc biệt trong trường hợp có liên kết tiêu thụ với công ty chế biến xuất khẩu gạo. Nghiên cứu được thực hiện dựa vào số liệu phỏng vấn trực tiếp 120 nông hộ trong vụ Đông Xuân 2021-2022, thuộc ba nhóm (i) hộ trồng lúa Nhật và có hợp đồng với công ty để tiêu thụ, (ii) hộ trồng lúa Nhật và bán lúa cho thương lái và (iii) hộ trồng lúa cao sản nhóm Indica tại tỉnh An Giang. Thống kê mô tả, phân tích phương sai và hồi quy đa biến là những công cụ được sử dụng để phân tích số liệu thu thập. Kết quả cho thấy rằng, lúa Nhật có năng suất tương đối cao và chi phí sản xuất cũng tương đồng với năng suất và chi phí của nhóm trồng lúa Indica. Tuy nhiên nhờ giá thu mua cao hơn của nhóm nông dân có hợp đồng tiêu thụ với công ty chế biến xuất khẩu đã làm tăng lợi nhuận rất đáng kể cho nông dân. Tiếp theo là lợi nhuận của nhóm hộ trồng lúa Nhật bán cho thương lái và cuối cùng là nhóm hộ trồng lúa nhóm Indica. Từ kết quả này một số hàm ý chính sách về giống và liên kết tiêu thụ được khuyến cáo.
Nghiên cứu các nhân tố tác động đến tính tích cực và kết quả học tập của sinh viên trên địa bàn thành phố Đà Nẵng
Authors: Ngô Đức Chiến , Nguyễn Thị Ngọc , Phan Thoại Chiêu
Published: August 2023

Thông qua các khái niệm cơ bản về tính tích cực trong học tập, kết quả học tập, các giả thuyết nghiên cứu và các công trình nghiên cứu đi trước, nhóm tác giả tiến hành khảo sát 343 sinh viên đang theo học tại thành phố Đà Nẵng nhằm đánh giá tác động của các nhân tố đến tính tích cực trong học tập và kết quả học tập của sinh viên tại thành phố Đà Nẵng. Từ đó, nhóm tác giả ứng dụng phần mềm SPSS và AMOS thông qua các phép phân tích cơ bản trong nghiên cứu định lượng như thống kê, đánh giá độ tin cậy Cronbach’s alpha, phân tích nhân tố EFA & CFA, mô hình SEM để thể hiện rõ kết quả các nhân tố tác động đến tính tích cực trong học tập và kết quả học tập của sinh viên tại thành phố Đà Nẵng. Kết quả nghiên cứu cho thấy: (1) Các nhân tố Cơ sở vật chất, Đội ngũ giảng viên, Chương trình đào tạo có ý nghĩa thống kê trong việc tác động đến Tính tích cực trong học tập của sinh viên; (2) Và nhân tố Tính tích cực trong học tập của sinh viên có ý nghĩa thống kê trong việc tác động đến Kết quả học tập của sinh viên.
Tình yêu của những con người bị tước đoạt nhân quyền trong Chí Phèo của Nam Cao và Nhà thờ Đức bà Paris của Victor Hugo
Authors: Bùi Ngọc Anh Thư
Published: August 2023

Văn học so sánh đã và đang là một lĩnh vực nghiên cứu đầy triển vọng. Thông qua bài viết này, chúng tôi mong muốn vận dụng lí thuyết của văn học so sánh vào nghiên cứu một trường hợp cụ thể, để thấy rõ hơn những tương đồng và khác biệt giữa cách thể hiện tình yêu của hai tác giả thuộc hai nền văn học, hai trào lưu văn học khác nhau. Với "Chí Phèo" và "Nhà thờ Đức Bà Paris", Nam Cao và Victor Hugo đã có nhiều phát hiện mới mẻ về sức mạnh của tình yêu đối với những con người dưới đáy xã hội.
Biện pháp nâng cao chất lượng phục vụ người sử dụng ở Trung tâm Học liệu Lê Vũ Hùng, Trường Đại học Đồng tháp
Authors: Nguyễn Hoàng Nam
Published: August 2023

Công tác phục vụ người sử dụng luôn được xem là công tác quan trọng nhất trong quá trình hoạt động của Trung tâm Học liệu Lê Vũ Hùng. Trên cơ sở trình bày những hoạt động trong công tác phục vụ người sử dụng tại Trung tâm Học liệu Lê Vũ Hùng, tác giả đề xuất một số biện pháp nhằm góp phần nâng cao chất lượng công tác phục vụ người sử dụng ở Trung tâm như: Tiếp tục đổi mới hình thức phục vụ người sử dụng; tổ chức các dịch vụ trực tuyến; bồi dưỡng nâng cao nhận thức, tinh thần trách nhiệm cho đội ngũ viên chức phục vụ; bổ sung tài nguyên thông tin; cải tạo không gian phục vụ; đầu tư, nâng cấp trang thiết bị hiện đại. Từ đó, sẽ giúp Trung tâm Học liệu Lê Vũ Hùng thực hiện và hoàn thành tốt chức năng là phục vụ các hoạt động hỗ trợ đào tạo, nghiên cứu khoa học của Nhà trường.
類型思維下“具有人身意義的特定物”之認定——以《民法典》第1183條第2款爲中心
Authors: 杜 嘉樹
Published: August 2023

針對《民法典》第1183條第2款下“具有人身意義的特定物”之認定問題，司法實踐狀况不容樂觀，總體而言裁判上缺少科學的認定方法。既有研究對特殊類型財産進行了概念化的初步嘗試具有一定啓發性，但却存在嚴重邏輯問題，有動搖外在體系之嫌。在“具有人身意義的特定物”的確立過程中存在著窮盡特徵的困難，立法上呈現出概念空洞化之危險傾向，而在司法裁判中則存在著以“歸屬”替代“涵攝”的現象。本文認爲應將“具有人身意義的特定物”作爲類型予以考察。作爲“規範性的現實類型”，“具有人身意義的特定物”系立法者對準外觀的描述，包含了“具有人身意義”“特定性”“有體物”三項特徵。在標準外觀背後，立法者的評價觀點在於對安全與自由之平衡。認定案涉客體能否歸入該類型實際上是基於評價觀點從整體上把握其與標準外觀的相似性。首先，司法者應考察特定事實，獲得案涉客體之整體圖像。其次，可利用既有實踐中的三類典型案型及其規則網絡進行判斷。最後，就超越典型案型的疑難案件而言，認定工作有賴於司法者的價值判斷。對於最終餘留的裁判空間，在排除明顯不屬“具有人身意義的特定物”客體後宜做肯定性評價，防止出現有違實質正義的裁判結果。
Students’ Perspective towards Educational Service Quality in Ethiopian Public University: A Triangulation Approach
Authors: Oliso Zelalem Zekarias , Alemu Demoze Degefa
Published: August 2023

In higher education, evaluating educational service quality from students’ perspective is vital to pinpoint institutional strengths and identify areas for improvement. The main purpose of this study was to examine students’ perspective towards education service quality of a public University in Ethiopia. Using qualitative case study design, the study employed purposive sampling technique to select participants including regular undergraduate students, student union representatives, teachers, department heads, college deans and student service directorate director. Semi-structured interview was conducted with twenty participants, consisting of six teachers, four student union representatives, five department heads, four college deans and one student service directorate director. Meanwhile, focus group discussion was conducted with twelve purposefully selected students. The thematic qualitative data revealed that students’ perception towards educational service quality of the University was found to be poor. This study further uncovered that poor provision of educational services affects students’ learning. Based on the findings, conclusions, recommendations and directions for further studies were forwarded.
A young man with Guillain–Barré syndrome, with a stroke-like presentation and physical findings suggestive of cervical myelopathy
Authors: Siddiqi Maria , Sardar Sundus , Alhatou Muhammad Ibrahim
Published: August 2023

We describe the case of a 44-year-old gentleman with hypertension and asthma presenting to the emergency department after noticing right upper-extremity weakness upon awakening. Brain imaging did not reveal a stroke. Initial neurological examination pointed to cervical myelopathy with radiculopathy as well as possible underlying length-dependent peripheral neuropathy as there was right arm strength of 4/5 and there were brisker (3+) reflexes all over except at the right biceps reflex and both ankle reflexes. Cervical spine magnetic resonance imaging (MRI) showed myelomalacia at the C2 level and an os odontoideum (OO). Os odontoideum is a chronic condition that occurs due to the failure of the center of ossification of the dens to fuse with the body of C2. By the next day after a few hours of sustaining a fall, weakness progressed to quadriparesis, without a sensory level on examination, followed by urinary retention. This situation was attributed to a possible cervical cord contusion due to the fall in the presence of OO, with other possibilities being spinal cord hemorrhage, infarct and transverse myelitis. However, repeat scanning of the cervical spine (MRI) did not reveal any acute cord changes. The initial examination for common causes of peripheral neuropathy did not reveal any findings. Finally, the diagnosis of Guillain–Barré syndrome (GBS) was considered, and treatment was initiated with intravenous immunoglobulin. Cerebrospinal fluid analysis was normal. The diagnosis was confirmed using electromyography. Our patient’s initial presentation of monoparesis and progression in an asymmetric descending manner was unusual for GBS. His initial presentation mimicked a stroke, and the later progression masqueraded as cervical myelopathy secondary to a chronic cervical cord lesion. The presence of a cervical cord lesion (upper motor neuron) concealed the expected areflexia in GBS. The presence of OO on spine imaging, absence of expected areflexia in GBS, and progression to paraparesis after the fall sidetracked the direction of the initial investigation and led to a relative delay in diagnosis. Nonetheless, appraising the diagnostic data in the clinical context led to an appropriate diagnosis. We emphasize the importance of reconciling the available clinical and diagnostic information to reach the correct diagnosis.