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Real-Time HIL Simulation for Frequency Regulation in DFIG with AGC: An Egyptian Case Study
No full text49th Annual Conference of the IEEE Industrial Electronics Society, IECON 2023 -- 16 October 2023 through 19 October 2023 -- Singapore -- 194573A sudden change in loads creates troubles in grids/microgrids (MGs) such as frequency fluctuations. For balancing between generation and demand, a Doubly fed induction generator (DFIG) has been incorporated into the Egyptian power system (EG-EPS) to provide additional inertia. The studied EG-EPS consists of three conventional power plants (reheat, non-reheat, and hydro) as the main sources of generation, with 20% DFIG participation. The existing literature highlights that the control methods employ for LFC and DFIG in MGs are insufficiently coordinated for minimizing deviations in frequency and power. This limitation arises due to narrow control constraints and inadequate sensitivity to disturbances. To this regard, this paper proposes an adaptive control-based balloon effect modulation (BE) to tune the PID controller for the Automatic Generation Control (AGC) and to tune the PI controller of the DFIG speed controller. The balloon effect tool is used to minimize the impact of system load disturbance by increasing the optimizer sensitivity and traceability. The EG-EPS is examined under the influence of a 2% step load perturbation and random load variations using dSPACE DS1006 and real-time digital simulator (RTDS) as a Hard-In-Loop (HIL) test platform. The proposed controller demonstrates superior performance compared to the conventional one in terms of overshoot, undershoot, and stabilizing time. © 2023 IEEE.Ministry of Higher Education of the Arab Republic of Egypt; Villum Fonden, (25920); Villum Fonde
Software in the Loop (SIL) Simulation for an Autonomous Multirotor Flight Planning and Landing with ROS and Gazebo
No full text7th International Symposium on Innovative Approaches in Smart Technologies, ISAS 2023 -- 23 November 2023 through 25 November 2023 -- Istanbul -- 196776Unmanned Aerial Vehicles (UAVs) have emerged as a transformative asset in surveillance, mapping, and delivery tasks since they have sophisticated autonomous capabilities. This paper focuses on enhancing the UAV autonomy by addressing the autonomous detection of suitable landing sites and safe landing flight planning, which are both critical in emergency scenarios. To mitigate the possible risks during the flight tests, vision-based sensors and image processing techniques, along with the developed guidance and control algorithms are evaluated in Software in the Loop (SIL) simulation using the Robot Operating System (ROS) and Gazebo simulation environments. The key novelty of this paper is proposing a vision-based hybrid LQR-integrator flight planning strategy for safe landing and optimal control of the UAVs. Therefore, this paper incorporates the image processing techniques for the landing site detection and UAV kinematics for safe and autonomous landing on the selected site. Further contributions of this paper are the selection of a compatible image processing technique, translation of the selected site position data into a control reference frame, development of a novel controller strategy, and the utilization of an observer for destination verification. Through the comprehensive simulations using Gazebo and ROS, the paper evaluates the effectiveness of the proposed framework, paving the way for further real-world testing and implementation. © 2023 IEEE.Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTAK, (120 M793
Turkish Adaptation and Psychometric Properties of Nijmegen Gender Awareness in Medicine Scale: Assessment of Validity and Reliability
No full textObjective: Gender affects how we serve and receive medical care. World Health Organization evaluates gender as a social determinant of health. However, a knowledge gap exists among GAMS) in the Turkish language and define Turkish medical students' gender awareness level and related factors.Methods: Two hundred seventy-two medical students participated in this cross-sectional study. The GAMS were utilized to collect data; in addition to sociodemographic form.Results: Cronbach Alpha value for the gender sensitivity subscale of Turkish N-GAMS was calculated as 0.810, gender role ideology towards patients as 0.919, and gender role ideology towards doctors as 0.896. In the confirmatory factor analysis conducted for the scale's factor structure, the scale had a three-factor structure consisting of gender sensitivity, gender role ideology towards patients, and gender role ideology towards doctors, which are interrelated. In the criterionrelated validity analysis, gender sensitivity was associated with empathy (r=0.206 p=0.001) and benevolent sexism (r=0.148 p=0.015). Gender role ideology toward patients scores was related to male gender (t=3.920 p<0.001), low empathy (r=-0.159 p=0.009), hostile sexism (r=0.638 p<0.001), and benevolent sexism (r=0.545 p<0.001). Gender role ideology towards doctors was related to male gender (t=2.669 p=0.008), low empathy (r=-0.143 p=0.018), hostile sexism (r=0.618 p<0.001), and benevolent sexism (r=0.573 p<0.001).Conclusions: N-GAMS is valid and reliable among Turkish medical students. Turkish medical students in our sample are less gender-sensitive than their European counterparts. There is a need for education on gender awareness in medical schools
Cardioprotective Effect of Pistacia vera L. (Green Pistachio) Hull Extract in Wistar Albino Rats with Doxorubicin-Induced Cardiac Damage
No full textBackground: Pistacia vera L. (green pistachio) has been shown to increase antioxidant capacity and protect against cardiovascular diseases and cancer. This study investigated the protective effect of the Pistacia vera L. hull in rats with experimental cardiac damage induced by doxorubicin. Methods: Sixty adult Wistar albino rats were randomly divided into 5 groups (n=12). Sham, doxorubicin, doxorubicin + Pistacia vera L. extract 50 mg/kg, doxorubicin + Pistacia vera L. extract 100 mg/kg, and Pistacia vera L. extract 100 mg/kg. Biochemistry param- eters, total antioxidant status, total oxidant status, oxidative stress index, 8-hydroxy- deoxyguanosine, and caspase 3/7 values were measured in serum samples. Excised heart tissues were examined histopathologically. Results: The groups were statistically significantly different in 8-hydroxy-deoxyguanosine, caspase 3/7, total antioxidant status, total oxidant status, oxidative stress index, and basal biochemical parameter values (P < .05, P < .001). In group II, 8-hydroxy-deoxyguanosine, caspase 3/7, and total oxidant status values increased while the total antioxidant status value decreased (P < .001). In the treatment groups (group III and group IV), 8-hydroxy- deoxyguanosine and caspase 3/7 values decreased compared to group II (P < .001). While total oxidant status and oxidative stress index values decreased in the treatment groups, total antioxidant status values increased (P < .001). The histopathological examination of the heart revealed fewer areas of focal necrosis in the treatment groups compared to group II. Conclusion: In this study, the cardioprotective effect of Pistacia vera L. hull extract was investigated in vivo. It was shown that Pistacia vera L. hull extract reduced apoptosis and deoxyribonucleic acid damage in the face of cardiac damage and had antioxidant activ- ity. Future studies will increase our knowledge on this subject
Ethical Climate: Exploring the Knowledge Base
No full textThe ethical climate concept has emerged as an influential paradigm in the 1990s, following the study of business ethics centered on corporate scandals. Extensive studies and reviews have been fueled by thirty years of knowledge accumulation. However, few bibliometric studies are conducted, and none focus on the knowledge base.Using bibliometric analyses, this study aims to investigate knowledge base for ethical climate from 1988 to 2022.Authors, journals, and documents were initially examined in terms of production, citation, and co-citation analyses using an integrated thematic approach.Next, the conceptual patterns through co- occurrence analyses and the structure of international collaboration were investigated. Bibliometric analyses show that the rapidly growing body of literature in the 2000s has shifted its focus to areas like sales and marketing and, particularly, the nursing environment.The study provides readers with a roadmap and recommendations for further study
Investigation of the construction and demolition materials reinforced by geosynthetics
No full textMany researchers suggest using construction and demolition materials in engineering applications (C & D) rather than virgin aggregates (VA). However, the engineering properties of the C & D tend to be poorer than those of the VA. This study presents the results of plate loading tests performed on unpaved roads with the C & D, reinforced by different types of geosynthetics on the soft subgrade. As part of these tests, the effects of some geosynthetics' parameters such as (1) the embedment depth, (2) height and pocket opening of geocell, (3) the embedment depths and number of geogrids, (4) the distance between geogrids, and (5) the stiffness of geotextile on the bearing capacity of the unpaved road were investigated. Besides, the same plate loading test was also conducted on an unpaved road built by the VA. As a result of this study, although the performance of the C & D was determined to be less than that of the VA, it was concluded that the C & D performed well enough to be used as an alternative to the VA on unpaved roads. Besides, with a very small number of geosynthetics, it was determined that the C & D could have a better performance than that of the VA
Implementation of shear-locking-free triangular refined zigzag element for structural analysis of multilayered plates with curvilinear fibers
No full textModeling and analysis of composites with curvilinear fiber reinforcement is rather challenging in terms of ac-curacy and computational cost associated with variable material stiffness. In this study, to reduce the compu-tational cost drastically without sacrificing the numerical accuracy, variable stiffness composite laminate (VSCL) is modelled as a single layer based on the refined zigzag theory (RZT). To this end, a three-node triangle RZT element formulation is adopted and effectively implemented for static analysis of multilayer composites and sandwich plates with curvilinear fiber paths. Moreover, to accurately model the strains in VSCL, the derivatives of the zigzag functions with respect to planar coordinates are considered for each ply within the laminate in the RZT kinematic-strain relations. Enhanced capability of the present model is verified by performing compre-hensive numerical investigation on several benchmark cases. The obtained results are compared with those present in the literature and three-dimensional elasticity solutions. Hence, it is demonstrated that the triangular RZT element is a fast, robust, and accurate structural analysis platform that can potentially lend itself to the optimization of curvilinear fiber angles of VSCL
Researching the possibilities of making noodles with tiger nut pomace
No full textLisansüstü Eğitim Enstitüsü, Gıda Mühendisliği Ana Bilim DalıBu çalışmada Türkiye'de geleneksel yöntemle üretilen erişteye, besinsel lif ve minerallerce zengin olan ve üretimi yeni yeni gelişen yer bademinin posasının unu, farklı oranlarda (%10, %20, %30) ilave edilerek erişte yapma olanakları araştırılmış ve erişteye fonksiyonel özelliklerin kazandırılması amaçlanmıştır. Ham maddelerin ve eriştelerin bazı fiziksel, kimyasal, toplam fenolik madde ve antioksidan özellikleri ile eriştelerde duyusal özellikler belirlenmiştir. Ham maddelerde (buğday unu ve yer bademi unu) sırasıyla nem değerleri %12.19 ve %7.92, kül değerleri %0.47 ve %1.33, protein değerleri %10.38 ve %4.79, yağ değerleri %1.42 ve %26.87, diyet lifi değerleri de %4.96 ve %27.39 olarak hesaplanmıştır. Üretilen eriştelerin de nem değerleri %8.68 ile %11.24 arasında, kül değerleri %0.61 ile %1.10 arasında, protein değerleri %15.49 ile %19.43 arasında, yağ değerleri %3.65 ile %10.24 arasında ve diyet lifi değerleri de %8.25 ile %17.34 arasında belirlenmiştir. Yer bademi unu ilavesi ile eriştelerde diyet lifi, kül ve yağ içeriklerinde artış olduğu gözlemlenmiştir. Ham maddelerde (buğday unu ve yer bademi unu) sırasıyla renk değerleri L* 95.40 ve 67.18, a* 0.57 ve 5.64, b* 9.31 ve 21.5, c* 9.33 ve 22.23, h 86.46 ve 75.3 olarak ölçülmüştür. Üretilen eriştelerin de renk değerleri L* 77.31 ile 89.39 arasında, a* 2.68 ile 3.39, b* 14.60 ile 15.30 arasında, c* 14.84 ile 15.68 arasında, h 77.48 ile 79.63 arasında ölçülmüştür. Yer bademi unu kullanımı eriştelerin L* (parlaklık) ve h (renk açısı) değerlerini düşürmüş fakat a* (kırmızılık), b* (sarılık) ve c* (renk doygunluğu) değerlerini genel olarak artırmıştır. Ham maddelerde (buğday unu ve yer bademi unu) sırasıyla toplam fenolik madde miktarları 73.23 µg GAE/g ve 107.98 µg GAE/g, DPPH (% inhibisyon) metodu ile antioksidan aktivite değerleri de %11.83 ve %39.75 olarak belirlenmiştir. Üretilen eriştelerin de toplam fenolik madde miktarları 74.74 µg GAE/g ile 87.32 µg GAE/g arasında, DPPH (% inhibisyon) metodu ile antioksidan aktivite değerleri de %12.57 ile %17.89 arasında olduğu belirlenmiştir. Eriştelerde ağırlık artışı değeri kontrol örneğinde %148.99 iken yer bademi ilavesine bağlı olarak bu oran artmış ve %201.38 değerine ulaşmıştır. Hacim artış değerleri incelendiğinde %221.89 ile %270.11 arasında değiştiği ve genel olarak bir artış olduğu görülmektedir (p<0.05). Kontrol örneğinde suya geçen kuru madde miktarı %3.97 gibi bir değerde iken %30 ikameli örnekte %12.43 gibi yüksek değerlere çıkmıştır. Artan yer bademi unu oranı ile birlikte suya geçen madde miktarının da arttığı tespit edilmiştir. Optimum pişme süresi incelendiğinde kontrol örneği 14.51 dk iken yer bademi unu ilave oranı arttıkça optimum pişme süresi azalmış ve %30 ikameli örnekte 6.52 dk olarak tespit edilmiştir. Pişmemiş eriştelerde renk, çatlaklık, yüzey düzgünlüğü, görünüş ve genel beğeni (tercih sırası) duyusalında en yüksek puanı kontrol örneği alırken en düşük puanı %30 yer bademi unu ilaveli erişteler almıştır. Pişmiş eriştelerde de renk, koku, tat, yapışkanlık, görünüş, ağız hissi (sertlik) ve genel beğeni (tercih sırası) duyusalında yüksek puanı kontrol örneği ile %10 ikameli örnek almıştır. En düşük puanı %30 ikameli örnek almıştır. Yer bademinin gıdaları zenginleştirmek amacıyla iyi bir polifenol kaynağı olabileceği, gıdaların besinsel özelliklerini iyileştirebileceği ve literatür araştırmalar sonucunda da insan sağlığına faydalı olabileceği görülmüştür.In this study researched about dietary fibre and to the flour of the tiger nut which is rich in minerals and which is newly developed (10%, 20%, 30%) additional noodle making possibilities were researched. It is aimed to gain functional properties to noodles. Some physical, chemical, total phenol and antioxidant properties with sensory properties were determined in raw materials and noodle. Respectively humidity values are 12.19% and 7.92%, ash values 0.47% and 1.33%, protein values 10.38% and 4.79%, fat values as 1.42% and 26.87%, dietary fibre values as 4.96% and 27.39% are calculated in raw materials. The moisture values of the noodles produced are between 8.48% and 11.24% ash values between 0.61% and 1.10%, protein values between 15.49% and 19.43% between 3.65% and 10.24%, and dietary fibre values between 3.65% and 10.24%. It was determined between 17.34%. It has been observed in additional of tiger nut and nutritional fibre, and fat content. In raw materials (wheat flour and Tiger nut flour), colour values are L* 95.40 and 67.18, a* 0.57 and 5.64, b* 9.31 and 21.5, c* 9.33 and 22.23, h as 86.46 and 75.3 measured. The colour values of the noodles produced are L* between 77.31 and 89.39, a* between 2.68 and 3.39, b* between 14.60 and 15.30, c* between 14.84 and 15.68, h between 77.48. It was measured between 79.63. The use of Tiger nut flour values the L* (brightness) and h (colour angle) values of the noodles decreased a* (redness), b* (yellowness) and c* (colour saturation) values in general as increased. Total phenolic amounts had determined as 73.23 µg GAE/g and 107.98 µg GAE/g with DPPH (% inhibition) method and antioxidant activity amounts had determined as %11.83 and %39.75. Noodles are also total phenolic substance amounts between 74.74 µg GAE/g and 87.32 µg GAE/g, DPPH (% inhibition) The antioxidant activity values were found to be between 12.57% and 17.89% with the method determined. While the weight gain value in the noodles was 148.99% in the control sample, it was dependent on the addition of Tiger nut. As a result, this ratio increased and reached the value of 201.38%. When we look at it, it is seen that it varies between 221.89% and 270.11% and there is a general increase is seen to volume increase values. The amount of dry matter transferred to the water in the control sample was 3.97% value, while it increased to high values such as 12.43% in the 30% substituted sample. It was determined that the amount of substance passing into the water increased with the almond flour ratio. When looking at the optimum cooking time, the control sample is 14.51 minutes, while the Tiger nut flour As the addition rate increased, the optimum cooking time decreased and 6.52 min in the 30% substituted sample was detected. Colour, cracks, surface smoothness in uncooked noodles, control sample with the highest score on the sensory appearance and general taste (order of preference) while noodles with 30% Tiger nut flour added the lowest score. Baked color, odour, taste, stickiness, appearance, mouthfeel (hardness) and general taste in noodles. (order of preference) sensory received a control sample with a high score and a 10% substituted sample. It received the lowest score 30% substituted sample. Tiger nut can be a good source of polyphenols to enrich foods. It can be said that it can improve the nutritional properties of foods. As a result of literature researches, has been shown to be beneficial to human health
Bibliometric analysis of academic studies on project management success
No full textLisansüstü Eğitim Enstitüsü, Ekonomik ve Sosyal Etki Değerlendirme Çalışmaları Ana Bilim DalıProje yönetimi, projenin belirlenen hedeflere ulaşmak için zaman, bütçe ve kapsam gibi faktörleri dikkate alarak planlama, organize etme, yönlendirme ve her aşamayı kontrol etme sürecidir. Bu bağlamda proje yönetimi askeri, mimari, eğitim ve sanayi gibi farklı niteliklere sahip her alanı ilgilendirebilmektedir. Nitekim birçok ulusal ve uluslararası çalışana sahip sektör yatırımcıları bünyesinde oluşturdukları proje departmanlarıyla bu alana verdikleri önemi ortaya koymaktadır. Proje yönetiminin gün geçtikçe öneminin hissedilmesiyle birlikte uluslararası sahada varlığını hissettiren proje yönetiminde söz sahibi olan Project Management Institute (PMI), International Project Management Association (IPMA) ve Association for Project Management (APM) gibi kuruluşlar da çizdikleri yol haritalarıyla günümüzde proje yöneticilerine katkıda bulunmaya devam etmektedirler. Ayrıca alana özgü yapılan akademik çalışmalar projelerin başarıyla yönetilmesinde proje yöneticilerine katkı sunan diğer yol göstericiler olmuşlardır. Tez çalışmasında, proje yönetimi başarısı konusunda Web of Science (WoS) veri tabanında endekslenen akademik makaleler incelenmiş ve bibliyometrik analiz yöntemiyle tablo, grafik ve bilim harita tekniği kullanılarak yorumlamalar yapılmıştır. Sonuçlar proje yönetimi başarısına yönelik literatürün yorumlanmasını içerdiğinden bu alanda yapılacak çalışmalar için yol gösterici niteliktedir ve alanın geçmişini analiz ederken geleceğine ilişkin çıkarımlar yapması açısından oldukça önemlidir. Anahtar Kelimeler: Proje, Proje Yönetimi, Proje Başarısı, BibliyometriProject management is the process of planning, organizing, directing and controlling every aspect of a project, taking into consideration factors such as time, budget and scope in order to achieve the defined objectives. In this context, project management is relevant to various fields with different characteristics, including military, architecture, education and industry. Indeed, the establishment of project departments by sector investors with numerous national and international employees highlights the importance they attach to this field. As the significance of project management is increasingly recognized, organizations such as the Project Management Institute (PMI), International Project Management Association (IPMA), and Association for Project Management (APM) have emerged as influential players in the international arena, providing valuable contributions to project managers through their outlined roadmaps. Furthermore, specific academic studies conducted in the field have served as additional guiding references for project managers in successfully managing projects. In the thesis study, academic articles indexed in the Web of Science (WoS) database were examined in terms of project management success and interpretations were made using bibliometric analysis methods, including tables, graphs and science mapping techniques. The obtained results hold significant guiding qualities for future studies in the field, as they involve the interpretation of literature related to project management success. Moreover, they are important in terms of making inferences about the future while analyzing the past of the field. Keywords: Project, Project Management, Project Success, Bibliometric
Numerical Investigation of the Passive Flow Control Around a Circular Cylinder
No full textThe effects of a perforated cylinder on the passive flow control around a circular cylinder mounted on a wall were investigated. The perforated cylinder was placed outside of the single circular cylinder concentrically. The large-eddy simulation was used to resolve the flow field. The study was aimed at both reducing the drag coefficient of the single cylinder and controlling the fluctuating forces acting on the single cylinder caused by vortex shedding in the downstream wake. The results showed that the structure of the downstream wake flow of the single cylinder changed significantly after placing the perforated cylinder. For example, von Karman vortices disappeared, and the maximum magnitude of turbulent kinetic energy, TKE, in the downstream wake was reduced. The time-averaged drag coefficient of the single cylinder was decreased by 69%. In addition, the maximum value of the lift coefficient of the single cylinder was reduced by eight times when the perforated cylinder was placed outside the single cylinder