<jats:p>Plants are used by humans not only as food, but also for therapeutic purposes in medicine, as fuel and coloring matter. Plants, which are among the natural products consumed as traditional medicines, are used in the treatment of many diseases. Nowadays, many plants are widely used as nutritional supplements to strengthen the immune system or as an auxiliary nutritional supplement with other drugs in the treatment of chronic diseases. The plant Arum maculatum L. examined in this study is an angiosperm and monocotyledonous plant belonging to the family Araceae and a species in the order Arales. In this study it is aimed to study the bioavailability of Arum plant by using C. elegans nematode as a model organism. This study, the effects of the extract obtained by ethyl alcohol and water phase extraction of A. maculatum L., which is collected in spring and summer months and consumed by cooking fresh leaves and believed to be a source of healing, on the life span, egg production and growth-development parameters of Caenorhabditis elegans nematode were investigated. The data obtained were evaluated by SPSS program. Significant differences were found in C. elegans cultures of the extracts obtained from the leaves and flower parts of the plant in ethyl alcohol and water solvents compared to the control group. It was observed that the survival rates of C. elegans nematodes generally increased with the application of different doses of plant water extracts. This research will provide a reference for further research on the mechanism of Arum plants in the treatment of some diseases. Our research shows that this plant may have the potential therapeutic target about fertilization and growth and development process.</jats:p>
Çalışma köy okulunda öğrenim gören 8. sınıf öğrencilerinin görsel okuma biçimlerini tespit etmeyi amaçlamaktadır. Bu çalışmanın yapılma sebebi, literatürde 8. sınıf köy okullarında öğrenim gören öğrencilere yönelik görsel okuma özelinde yapılmış bir çalışmaya rastlanılmaması ve merkezi yerleştirme sınavlarında görsel okumaya yönelik soruların artış göstermesidir. Çalışma durum çalışma modeli ile kurgulanmış, nitel bir araştırmadır. Çalışma grubunu kolay ulaşılabilirlik ve ölçüt örneklem yoluyla seçilen 8. sınıfta öğrenim gören 56 köy okulu öğrencisi oluşturmaktadır. Çalışmada veri toplama aracı olarak, görsellere ait yorumların istendiği açık uçlu çalışma kâğıtları kullanılmıştır. Cevaplar betimsel analize tabi tutularak Hasan Efe’nin “Karikatürü Düşündüren İnsan” kitabında belirttiği görsel metin olarak karikatürün anlam yapısı konusunda derin yapı ve yüzey yapı başlıklarına göre kategorize edilerek incelenmiştir. Cevaplarda öğrencilerin çoğunluğunun yüzeysel yapıyı tasvir ettiği sonucuna ulaşılmıştır. Bu kategorideki 12 öğrencinin cevabında düz okumada öne çıkan sembollerin yüzeysel yapıdan uzaklaşarak simgelere başka anlamlar yüklediği göze çarpmıştır. Sonuç olarak köy okullarında öğrenim gören çocukların çoğunun görsel okuma açısından yeterince gelişemediği görülmüştür. Öğretmen görüşlerine göre öğrenci velilerinin eğitime ilgisizliği, bu öğrencilerin öğrenim hayatları boyunca farklı uyarıcılarla karşılaşmaması ve teknolojik araçlara rahat erişimlerinin mümkün olmaması ile okuma alışkanlıklarının edinmiş olmamaları, bu duruma sebep teşkil eden durumlardır.
The design of the system used for brushless DC (BLDC) motor control in speed and position control is difficult due to the non-linear structure. Therefore, the designed controller is required to respond to these challenges and need high-efficiency operation. This paper presents the experimental validation of a robust speed control structure of a BLDC motor based on continuous sliding mode (CSM) and fractional-order sliding mode (FOSM) controllers. The controllers have been tested for low and medium speed reference signals and amplitude values. Then, both controllers have been compared in term of tracking performance and error elimination and the results have been shown graphically. Experimental results prove that the FOSM controller shows better trajectory tracking performance than CSM controller with high precision as well as good robustness against changes of references.
Earthquakes of magnitude Mw = 7.7 and Mw = 7.6 hit the city of Kahramanmaraş (Turkey) on 6 February 2023. These earthquakes caused serious damage in 11 provinces in Turkey resulting in over 50,000 deaths and huge economic losses with the collapse of thousands of buildings. Two consecutive devastating earthquakes have severely damaged the reinforced concrete building stock located in Malatya. There are many reasons reinforced concrete structures suffer damage under the influence of seismic loads. These reasons can be listed as material and section properties that do not comply with earthquake codes, workmanship defects, ground parameters that are not considered and design errors, as seen in field investigations after earthquakes in Turkey in the past. In this research, a field study was conducted on reinforced concrete buildings damaged after the earthquakes in Malatya province. The causes of structural damages in reinforced concrete buildings between 6–26 years of age were assessed in terms of design and material defects. The structural damages were mainly caused due to insufficient stirrups in structural members, short column, strong beam–weak column, failures of infill walls, soft story type collapse, poor concrete quality, and reinforcement corrosion. In addition to the field investigation, the spectrum relationships created using raw acceleration data obtained from DEMP (Disaster and Emergency Management Presidency) stations in Malatya province were compared with the design response spectra.
In this study, a thermodynamic analysis of a solar assisted Rankine-Goswami integrated cycle is carried out for a range from 230 to 240 MW sizes. To illustrate the performance characteristics of these integrated cycle, an exergy analysis is conducted to pinpoint the losses due to internal and external irreversibilities of each component. In addition, the effect of design parameter such as condenser pressure on the performance of the integrated cycle is examined. The results shows that the variation of condenser pressure from 4 kPa to 24 kPa greatly reduces the exergy efficiency of the system. Moreover, it is found the exergy efficiency of standard solar assisted Rankine cycle case is 42.8% whereas the exergy efficiency of solar Rankine-Goswami multigeneration system is 47.03%.
concrete strength levels, namely, of 25 and 40 MPa. Load-displacement curves, energy absorption capacities, stiffness degradation, the moment-curvature relationship, the plastic hinge mechanism and the ductility index were experimentally obtained at two different concrete types along with the measured stress-strain properties of the conventional and perlite concrete. The test results showed that the construction of the RC columns using only perlite may become possible in future by providing an adequate concrete stress-strain capacity, which will be improved.
The negative results resulting from the corrosion of reinforced concrete reinforcement are important for the investigation of corrosion in the reinforced concrete reinforcement. Corrosion affects the performance levels of reinforced concrete structures in addition to shortening the service life of the economic sense, and in the following stages of the destruction of structures can lead to destruction. With the resulting corrosion; the reduction of the reinforcement cross-sectional area leads to negative results such as the volume increase caused by the corrosion product and the decrease in the bond strength between the concrete and the reinforcement. With these results, the bearing capacity, bending and torsional strength of reinforced concrete elements are reduced, and the targeted building performance is avoided. Studies on estimating the bending behavior of rusted reinforced concrete elements are suffıciently available in the current literature; The behavior of rusted reinforced concrete elements under the effect of simple torsion has not been studied yet. This behavior, combined with the primary crack widths formed by corrosion, adversely affects the torsional stiffness according to the cracked section. For this purpose, 6 reinforced concrete beams of C25 concrete class were rusted at different rates by using accelerated corrosion method. In order to obtain the real corrosion rates, the reinforced concrete reinforcements were removed by mechanical and chemical cleaning before the beams were removed after the loading tests. In order to fınd the actual mass losses of all windings and longitudinal reinforcements, the masses of the reinforcements in the precision balance were recorded and compared with the fırst masses and the actual corrosion rates were also obtained.
Printed Circuit Boards (PCBs) are electronic boards that hold electronic components together and provide the electrical connection between these components. Printed circuit boards offer many advantages over traditional wired circuits, such as durability, less heat, minimal wiring, and ease of assembly. Correct design and production of printed circuit boards significantly affect the quality and efficiency of printed circuit boards. In this study, a defect detection system based on machine learning and deep learning algorithms is proposed to help produce printed circuit boards accurately and minimize the error rate. In the proposed system, missing hole, mouse bite, open circuit, short, spur, and spurious copper defects on the printed circuit have been determined. According to the results obtained, According to the results obtained, success accuracies of 74.62% were obtained with YOLO-v4, 47.83% with HOG+SVM, and 39.86% with HOG+KNN. It has been seen that the algorithms discussed in the study are applicable in the detection of defects in printed circuit boards.
In the study, the degradation of landfill leachate by single ultrasound (sonolytic) and sonolytic combined with Fe2+ and TiO2 catalysts was carried out in laboratory conditions. The effect of pH and ultrasonic wave amplitude was also investigated in terms of color removal, total organic carbon (TOC) and chemical oxygen demand (COD) from leachate by the sonolytic degradation process. In this process, the color removal efficiency was recorded as 81.81% at 620 nm, pH = 2.0 and 70% wave amplitude. The sonocatalytic degradation of landfill leachate accompanied by different catalysts was studied by using the 70% wave amplitude at pH = 2.0 and room temperature for 20 min. The sonocatalytic degradation of leachate by using Fe2+ and TiO2 was found to be significantly higher than sonolytic degradation (p < 0.05). As the Fe2+ concentration increased from 1.0 to 3.0 mg/L, the COD and color removal of leachate significantly decreased (p < 0.05) from 50 to 35.7% and from 95.5 to 90.9%, respectively. The experimental data obtained from sonocatalytic degradation was analyzed using the Behnajady–Modirshahla–Ghanbery (BMG) kinetic models and found to be compatible. The results showed that the combination of catalyst and sonolysis was a highly effective way to remove color, COD and TOC from landfill leachate.
Flexible pavements stand out as the most commonly used worldwide, compared to rigid and composite pavements, owing to their versatility and widespread application. The use of hot mix asphalt (HMA) in flexible pavements causes significant environmental concerns due to high CO2 emissions and energy consumption, whereas warm mix asphalt (WMA) technologies have gained popularity in recent decades, offering a more sustainable alternative by enabling asphalt production at lower temperatures. WMA technologies can be categorized into three main groups: foaming, organic additives, and chemical additives, with each offering distinct benefits for performance and environmental impact. One of the chemical additives used in WMA production is Cecabase RT BIO10. In this study, virgin bitumen with 50/70 penetration was modified by adding Cecabase RT BIO10 at four levels: 0%, 0.3%, 0.4%, and 0.5% by weight. The experimental design employed a Taguchi L16 orthogonal array to systematically evaluate the effects of various factors on modified bitumen performance. Binders were prepared at four temperatures (110 °C, 120 °C, 130 °C, and 140 °C), four mixing durations (15, 20, 25, and 30 min), and four mixing speeds (1000, 2000, 3000, and 4000 rpm), enabling an efficient analysis of each parameter’s impact. The prepared binders were subjected to a series of tests, including penetration, softening point, flash point, rotational thin film oven test (RTFOT), elastic recovery, Marshall stability, ultrasonic pulse velocity (UPV), and FTIR analysis. These tests were conducted to investigate the effects of various parameters and levels on the binder properties. Additionally, stiffness and seismic modules were evaluated to provide a more comprehensive understanding of the binder’s performance. The experiment results revealed that the penetration, elastic recovery percentage, and Marshall stability increased with increasing additive content while the softening point and RTFOT mass loss decreased. At a high service temperature of 40 °C, the stiffness modulus of the modified bitumen decreased slightly. At a low service temperature of −10 °C, it decreased further. Additionally, the incorporation of Cecabase RT BIO10 led to an increase in the seismic modulus. Through optimization using the Taguchi method, the optimal levels were determined to be a 0.4% Cecabase RT BIO10 ratio, 140 °C mixing temperature, 30 min mixing time, and 1000 RPM mixing speed. The optimal responses for each test were identified and integrated into a unified optimal response, resulting in a comprehensive design guide with 95% confidence level estimates for all possible level combinations.
Günümüzde betonarme yapılarda, betonun ana bileşenlerinden olan agregalar çeşitli çevresel ve ekonomik problemlere neden olmaktadır. Bu durum, yapı sektöründe sürdürülebilir ve çevre dostu alternatif malzeme arayışını artırmıştır. Bu çalışmada, doğal perlit agregasının betonarme kirişlerde basit burulma etkisi altındaki yapısal davranışa etkileri araştırılmıştır. Deneysel çalışmada, C25 ve C40 sınıfında geleneksel betonlar ile P25 ve P40 sınıfında doğal perlit agregası kullanılarak üretilen betonarme kiriş numuneleri hazırlanmıştır. Numuneler, basit burulma etkisi altında eksenel yüklemeye tabi tutulmuş ve rijitlik, çatlak davranışı, nihai tork kapasitesi gibi parametreler değerlendirilmiştir. Elde edilen bulgular, doğal perlit agregasının betonarme kirişlerde burulma davranışı üzerinde olumlu etkiler gösterdiğini ve sürdürülebilir beton üretimi için potansiyel bir alternatif olabileceğini ortaya koymuştur.
Korozyona maruz kalmış betonarme yapıların sismik performanslarının tahmin edilmesi korozyona uğramamış yapılara göre daha zordur. Gerçekleştirilen bu deneysel çalışma ile birlikte korozyona maruz kalmış betonarme elemanları üzerine yapılacak olan çalışmalara ışık tutulması amaçlanmıştır. Beş adet tam ölçekli betonarme kolonu hızlandırılmış korozyon yöntemi kullanılarak farklı korozyon oranları için paslandırılmıştır. Paslandırılmış betonarme kolonları sabit eksenel yük altında monotonik yüklemeye tabi tutularak, akma ve nihai yükleri, süneklik oranları ve enerji yutma kapasiteleri deneysel olarak elde edilmiştir. Betonarme kolonlarındaki gerçek korozyon oranları yükleme deneylerinden sonra betonarme kolonlarının kırılarak ve gömülü olan tüm betonarme donatılarının çıkartılması ile elde edilmiştir. Yapılan deneysel çalışma sonucunda, monotonik yüklemenin tersinir-tekrarlanır yüklemeye göre zayıf yönleri göz önüne alınan deprem indeksleri açısından değerlendirilmiştir. Elde edilen deneysel sonuçlar doğrultusunda ileriki korozyon çalışmaları için önemli önerilerde bulunulmuştur. Gerçekleştirilen bu çalışma kapsamında, paslanmış betonarme kolonlarının monotonik yükleme etkisi altında süneklik oranları ve enerji yutma kapasiteleri artan korozyon oranına bağlı olarak azalmıştır. Monotonik yükleme etkisi altında pasın belirli oranlarına kadar sağlamış olduğu sargı etkisi ve buna bağlı olarak deprem indekslerindeki artışlar net bir şekilde görülememiştir. Tek doğrultuda göçme modu kabulü ile yapılacak olan sismik değerlendirmelerde kullanılmak üzere paslanmış betonarme kolonların süneklik ve enerji yutma kapasitelerinin tahmin edilebilmesi için iki ampirik model geliştirilmiştir.
