WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14517/18

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Citation Count: 0
5th and 6th grade students' perceptions of communication
(Pegem Akad Yayincilik Egitim Danismanlik Hizmetleri Tic Ltd Sti, 2020) Duran, Aysemin; Duran, Aysemin; Eğitim Bilimleri / Educational Sciences
This study aims to examine how 5th and 6th grade students perceive the phenomenon of communication. It was designed as a qualitative research and the phenomenological method was used. Totally, 80 students constituted the study group. A two-part "Communication Perception Form" was created by the researchers in order to determine the perceptions of the students regarding the phenomenon of communication. Content analysis technique was used in evaluating the data obtained in this study. Data on the phenomenon of communication were gathered among five categories (nature, emotion, food, existence, tool/mediator). In the visual metaphors of the students, it was seen that they drew telephone and talking people mostly. The metaphors developed by the 5th and 6th graders, which are the first levels of secondary school, can be considered as important indicators for understanding the positive and negative effects of communication on students. In this study, where communication generally evokes speech or correspondence, it can be suggested that students acquire this skill in various fields through programs, since it is seen that students make more in-depth descriptions in visual expression.
Citation Count: 2
Abstract elliptic operators appearing in atmospheric dispersion
(Springeropen, 2014) Shakhmurov, Veli B.; Sahmurova, Aida
In this paper, the boundary value problem for the differential-operator equation with principal variable coefficients is studied. Several conditions for the separability and regularity in abstract L-p-spaces are given. Moreover, sharp uniform estimates for the resolvent of the corresponding elliptic differential operator are shown. It is implies that this operator is positive and also is a generator of an analytic semigroup. Then the existence and uniqueness of maximal regular solution to nonlinear abstract parabolic problem is derived. In an application, maximal regularity properties of the abstract parabolic equation with variable coefficients and systems of parabolic equations are derived in mixed L-p-spaces.
Citation Count: 0
Abstract elliptic operators appearing in atmospheric dispersion (vol 2014, pg 43, 2014)
(Springer international Publishing Ag, 2014) Shakhmurov, Veli B.; Sahmurova, Aida
[No Abstract Available]
Citation Count: 5
Academic domains as political battlegrounds: A global enquiry by 99 academics in the fields of education and technology
(Sage Publications Ltd, 2017) Al Lily, Abdulrahman E.; Göğüş, Aytaç; Stoloff, David; Gogus, Aytac; Erguvan, Inan Deniz; Awshar, Mapotse Tome; Schrader, P. G.; Eğitim Bilimleri / Educational Sciences
This article theorizes the functional relationship between the human components (i.e., scholars) and non-human components (i.e., structural configurations) of academic domains. It is organized around the following question: in what ways have scholars formed and been formed by the structural configurations of their academic domain? The article uses as a case study the academic domain of education and technology to examine this question. Its authorship approach is innovative, with a worldwide collection of academics (99 authors) collaborating to address the proposed question based on their reflections on daily social and academic practices. This collaboration followed a three-round process of contributions via email. Analysis of these scholars' reflective accounts was carried out, and a theoretical proposition was established from this analysis. The proposition is of a mutual (yet not necessarily balanced) power (and therefore political) relationship between the human and non-human constituents of an academic realm, with the two shaping one another. One implication of this proposition is that these non-human elements exist as political actors', just like their human counterparts, having agency' - which they exercise over humans. This turns academic domains into political (functional or dysfunctional) battlefields' wherein both humans and non-humans engage in political activities and actions that form the identity of the academic domain. For more information about the authorship approach, please see Al Lily AEA (2015) A crowd-authoring project on the scholarship of educational technology. Information Development. doi: 10.1177/0266666915622044.
Citation Count: 21
Accuracy of single implant scans with a combined healing abutment-scan body system and different intraoral scanners: An in vitro study
(Elsevier Sci Ltd, 2021) Cakmak, Gulce; Donmez, Mustafa Borga; Atalay, Sevda; Yilmaz, Hakan; Kokat, Ali Murat; Yilmaz, Burak
Objective: The aim of the present study was to evaluate the accuracy of single implant scans with a combined healing abutment-scan body (CHA-SB) system using different intraoral scanners. Methods: A partially edentulous model with an implant was fabricated, and a CHA-SB system was secured on the implant. The model was scanned using an industrial-grade blue light scanner (ATOS Core 80) and a master reference model was generated (MRM). The model was also scanned with 4 different intraoral scanners (IOSs) [(Virtuo Vivo (VV), TRIOS 3 (T3), Omnicam (CO), and Primescan (PS)]. Test scans (n = 8) were superimposed over the MRM using the best fit algorithm (GOM Inspect 2018; GOM GmbH). After superimpositions, distance and angular deviations at selected areas on CHA-SB system were calculated. The data were analyzed with a 1way ANOVA and Tukey HSD tests for trueness and precision (alpha=0.05). Results: The differences in trueness (distance deviations) among tested IOSs were nonsignificant (P=.652). VV presented the highest angular deviations (P <=.031), and the angular deviations in other IOS scans were not found different (P >=.378). The precision of distance deviation data was not significantly different among scanners (P=.052). For the precision of angular deviation data, significant differences were found among IOSs (P=.002). Compared with PS (P=.007) and T3 (P=.014), VV had significantly lower precision, which was not significantly different than that of CO (P=.815). Conclusions: The accuracy (angular deviation) of scans of a combined healing abutment-scan body system on a single implant varied depending on the IOS. VirtuoVivo scans had the lowest accuracy in terms of angular deviations. When the distance deviation data were considered, scan accuracy of scanners was similar. Clinical Significance: A recently introduced combined healing abutment-scan body system combines the acquisition of both the implant and the soft tissue. When different intraoral scanners scan the combined healing abutment-scan body system, the scan accuracy may vary.
Citation Count: 2
Accuracy of the Anatomic Placement in Ultrasonography Guided Facet Joint Blockage with Supervising of C-Arm Fluoroscopy
(Briefland, 2019) Erdogan, Sinan; Okur, Sibel Caglar; Atici, Aysegul; Gokcen, Huseyin Bahadir; Polat, Baris; Atici, Yunus
Background: Facet joint blockage is a type of regional anesthesia which is performed selectively on the medial branch of the ramus dorsalis of the spinal nerve and is a current approach for the treatment of pain originating from facet arthropathy. This current approach to chronic low back pain caused by facet joint pathology is usually performed with ultrasound guidance. Objectives: The accuracy of anatomical placement of the facet joint with ultrasonography guidance is determined by C-arm fluoroscopy image taken as reference. Patients and Methods: A total of 22 patients who were diagnosed with facet joint syndrome were involved in the study. After detecting the superolateral corner of the facet joint, which is the target point with ultrasound, the control was provided with C-arm fluoroscopy by giving radiopaque fluid. In order to verify the localization, a mixture of 40 mg triamcinolone and 1 cc 2% lidocaine was injected. Results: Nerve blockage was applied to 67 facet joints at L3 - L4, L4 - L5 and L5 - Si level in a total of 22 patients (15 female and seven male) diagnosed with facet joint syndrome. The patients' mean age was 63 (range, 48 - 80), the mean body mass index was 28.4 (range,18.9 -38.1) and the mean time to determine facet localization with ultrasonography (USG) was 240 seconds (range,140 -320). Patients' mean visual analog scale (VAS) decreased from 7 (range, 6 - 9) to 2.5 (range, 1- 6). In the C-arm fluoroscopy control after the injection of radio-opaque material, the needle was found to be located in the lamina in four segments and it was relocated. In addition to this, two facet joints were not localized in ultrasound. This study concluded that the location of the facet joint with USG guidance is possible with 91% sensitivity and 100% positive predictive value when C-arm fluoroscopy was regarded as a gold standard in determining facet joint localization. No complications were observed. Conclusion: The results showed that ultrasonography guided facet joint block can be considered as a minimally invasive procedure that could be easily applied without radiation exposure.
Citation Count: 0
Acute spinal epidural hematoma: A case report and review of the literature
(Turkish Assoc Trauma Emergency Surgery, 2020) Akar, Ezgi; Ogrenci, Ahmet; Koban, Orkun; Yilmaz, Mesut; Dalbayrak, Sedat
Spinal epidural hematoma (SEH) is a rare but a significant cause of spinal cord compression and neurologic deficits. Its etiology is usually unknown and requires emergency intervention. The present study aims to review the clinical significance, treatment strategies and clinical outcomes of traumatic SEH with a rare case presentation. Our patient was a 42-year-old female who presented with back pain and loss of sensation and strength in the legs. The patient did not have any disease and did not use anticoagulant drugs. The patient developed numbness in her legs half an hour after having a traditional back walking massage due to occasional back pain. She was paraplegic and anesthetic when seen in our clinic. Thoracic computed tomography (CT) and magnetic resonance imaging (MRI) revealed posterior epidural hemorrhage at Th3-Th4 levels. In the 12th hour, the hematoma was evacuated by an emergency decompressive hemilaminectomy. At the postoperative 24th hour, the patient had symptomatic improvement, and in the sixth month, the patient was mobilized with support. SEH is a rare condition that should be considered in patients with sudden onset of back pain and extremity weakness. Although the gold standard diagnostic tool is MRI, CT is often sufficient to avoid delayed surgery. Immediate surgical decompression (laminectomy/hemilaminectomy) should be performed in cases diagnosed with SEH with neurological deficits.
Citation Count: 1
Adaptation of internal audit system to supervisory system in the provincial directorate of national education and a model proposal
(Pegem Akad Yayincilik Egitim Danismanlik Hizmetleri Tic Ltd Sti, 2020) Baris, Ali Erkan; Atanur Baskan, Gulsun
The aim of this research is to provide a supervision model for provincial directorates of national education in accordance with contemporary audit approaches. The study is designed as a mixed research method. The participants of the study include 4082 people; 3576 teachers, 452 administrators (10 provincial/district national education directors and assistant directors, 11 branch managers, 431 school principals and assistant principals) and 10 education supervisors working in public schools and institutions in Nevsehir in 2017 and 44 education supervisors working in the ministry of education. Data collection tools were developed by the researcher. The quantitative data were collected by the Adoption and Applicability Scale of the Internal Audit System (AASIAS). Qualitative data were collected through semi-structured interview form. Results of the study showed that the participants adopted the internal audit system to a great extent and found it applicable in provincial directorates of national education. In addition, the opinions of the participants were integrated into the internal audit system and a supervision model was developed for the purpose, structure and process dimensions of provincial directorates of national education.
Citation Count: 7
Adaptation problems and attitudes of teachers towards technological material using in courses
(Elsevier Science Bv, 2011) Korucu, Oktay; Aktas, Ceyhan; Katrancioglu, Sevan
With digital boards student can interact with claver course contents, teachers can save the board picture. It can be thought that digital boards are so efficient and useful. However, the main point is adaptation capabilities of existing teachers. Considering the capabilities of teachers on technological materials, it is difficult to achieve targeted success. So before building technological infrastructure to every classroom, it is important to make knowledge about these technologies. Because it is more important how you can benefit from technology than what it can be do. As a result in-service training is very important about using new technologies for existing teachers before facing with that. The sample of this study comprised of 50 participants who are high school and primary school teachers. The data were collected through a questionnaire. (C) 2011 Published by Elsevier Ltd.
Citation Count: 0
Addendum to Spinal Schwannomatosis: Case Report of a Rare Condition
(Turkish Neurosurgical Soc, 2017) Hakan, Tayfun; Celikoglu, Erhan; Aker, Fugen; Barisik, Nagehan
[No Abstract Available]
Citation Count: 0
Addressing urinary incontinence by gender: a nationwide population-based study in Turkiye
(Bmc, 2023) Yavuz, Melike; Etiler, Nilay
BackgroundUrinary incontinence (UI), which usually occurs in women but affects both sexes, is a significant public health challenge. This study aims to comprehensively investigate the prevalence and determinants of UI in men and women, considering gender-specific factors.MethodsThe study performed a secondary analysis on data obtained from 13,383 individuals surveyed in the 2019 Turkish Health Survey, providing a representation of the Turkish population. The dataset included sociodemographic and health-related variables like UI, body mass index (BMI), physical activity, smoking, and chronic diseases-statistical analysis employed chi-square tests and gender-stratified logistic regression models to identify UI-associated factors.ResultsOur results showed that UI affected 8.8% of the population, with a striking gender disparity. Women had a notably higher prevalence at 11.2%, while men had a lower rate of 5.5%. Importantly, this gender gap narrowed with age. For example, in the 34-44 age group, the female/male ratio was 6.9, but it decreased to 1.4 in the 65-74 age group. Marital status and employment status played significant roles. Separated, divorced, or widowed individuals, particularly women, had the highest prevalence at 19.3%. Employment status influenced UI prevalence, with employed men having the lowest rate (2.1%), while retired women faced the highest rate (15.0%). Higher BMI, especially in obese individuals, significantly raised UI prevalence, reaching 7.9% for men and 15.8% for women. Physical inactivity, notably in women (17.0%), and prolonged sedentary hours (13.9%) were associated with higher UI rates. Former smokers, especially women (15.9%), had a notable impact on UI. Poor perceived health and chronic conditions like Chronic Obstructive Pulmonary Disease (COPD), hypertension, and diabetes were significantly associated with higher UI prevalence. Logistic regression analysis revealed that age, education, perceived health status, COPD, and diabetes were significant factors associated with UI in both sexes, while in women, BMI, physical activity, and smoking also played notable roles.ConclusionsThis extensive UI study has unveiled notable gender disparities and determinants. Notably, these disparities decrease with age, underlining UI's changing nature over time. Modifiable factors impact women more, while non-modifiable factors are linked to men. The study underscores the importance of tailoring healthcare strategies to address UI based on gender.
Citation Count: 9
Adherence to guideline-directed medical and device Therapy in outpAtients with heart failure with reduced ejection fraction: The ATA study
(Turkish Soc Cardiology, 2020) Kocabas, Umut; Kivrak, Tarik; Oztekin, Gulsum Meral Yilmaz; Tanik, Veysel Ozan; Ozdemir, Ibrahim Halil; Kaya, Ersin; Pehlivanoglu, Seckin
Objective: Despite recommendations from heart failure guidelines on the use of pharmacologic and device therapy in patients with heart failure with reduced ejection fraction (HFrEF), important inconsistencies in guideline adherence persist in practice. The aim of this study was to assess adherence to guideline-directed medical and device therapy for the treatment of patients with chronic HFrEF (left ventricular ejection fraction <= 40%). Methods: The Adherence to guideline-directed medical and device Therapy in outpAtients with HFrEF (ATA) study is a prospective, multicenter, observational study conducted in 24 centers from January 2019 to June 2019. Results: The study included 1462 outpatients (male: 70.1%, mean age: 67 +/- 11 years, mean LVEF: 30%+/- 6%) with chronic HFrEF. Renin-angiotensin system (RAS) inhibitors, beta-blockers, mineralocorticoid receptor antagonists (MRAs), and ivabradin were used in 78.2%, 90.2%, 55.4%, and 12.1% of patients, respectively. The proportion of patients receiving target doses of medical treatments was 24.6% for RAS inhibitors, 9.9% for beta-blockers, and 10.5% for MRAs. Among patients who met the criteria for implantable cardioverter-defibrillator (ICD) and cardiac resynchronization therapy (CRT), only 16.9% of patients received an ICD (167 of 983) and 34% (95 of 279) of patients underwent CRT (95 of 279). Conclusion: The ATA study shows that most HFrEF outpatients receive RAS inhibitors and beta-blockers but not MRAs or ivabradin when the medical reasons for nonuse, such as drug intolerance or contraindications, are taken into account. In addition, most eligible patients with HFrEF do not receive target doses of pharmacological treatments or guideline-recommended device therapy.
Citation Count: 2
Adhesion of conventional and self-adhesive resin cements to indirect resin composite using different surface conditioning methods
(Taylor & Francis Ltd, 2017) Cilingir, Aylin; Bilhan, Hakan; Cilingir, Altug; Gomec, Yavuz; Ozcan, Mutlu
This study evaluated the adhesion of conventional and self-adhesive resin cements to indirect resin composite (IRC) using different surface conditioning methods. Cylindrical IRC specimens (N=192) were randomly assigned to four surface conditioning methods (n=8 per group): (a) Control group, (b) Hydrofluoric acid, (c) Tribochemical silica-coating, and (d) 50m Al2O3 air-abrasion. Specimen surfaces were finished using silicon carbide papers up to 600 grit under water irrigation, rinsed and dried. Direct composite blocks were bonded to IRC specimens using three conventional resin cements (Multilink, Panavia F2.0, and Resicem) and three self-adhesive resin cements (RelyX U100, Gcem, Speed Cem). Specimens were subjected to shear bond strength test in a Universal Testing Machine (0.5mm/min). Failure types were categorized as mixed, adhesive and cohesive. Data were analyzed using 2-way ANOVA and Tukey's tests. Two-parameter Weibull modulus, scale (m) and shape (0) were calculated. The bond strength results (MPa) were significantly affected by the surface conditioning method (p<0.0001) and cement type (p<0.001). For Panavia F2.0, Resicem, air-abrasion with 50m Al2O3 significantly increased the results (22.6 +/- 6.5, 26.2 +/- 6.5, respectively) compared to other conditioning methods (13.6 +/- 1.4-21.9 +/- 3.1) but for Multilink, hydrofluoric acid etching (20.5 +/- 3.5) showed significantly higher results (p<0.01). For the self-adhesive resin cements, air-abrasion with 50m Al2O3 significantly increased the results compared to other conditioning methods, except for RelyX U100 (p<0.05). After air-abrasion with Al2O3, Gcem, (11.64), RelyX U100 (9.05), and SpeedCem (8.29) presented higher Weilbul moduli. Exclusively cohesive failure in the IRC was observed with RelyX U100 and Speedcem after Al2O3 air-abrasion.
Citation Count: 7
Adjacent Segment Disease (ASD) in Incidental Segmental Fused Vertebra and Comparison With the Effect of Stabilization Systems on ASD
(Springernature, 2021) Hekimoglu, Mehdi; Basak, Ahmet; Yilmaz, Atilla; Yildirim, Hakan; Aydin, Ahmet Levent; Karadag, Kursat; ozer, Ali Fahir
Objective Adjacent segment disease is a controversial process after spine stabilization. The two important factors discussed are natural aging and hypermobility in incidental segmental fusion anomalies; patients have two or more fused vertebrae from birth, which are the results of spinal movement restriction due to the fusion of some spinal units. This article's main purpose is to determine the degree of relationship of hypermobility and the aging process in the deterioration of the disks adjacent to fusion. Methods In this study, the degenerative process developed by hypermobility in the adjacent segment due to incidental segmental fusion was evaluated. The MRI images of 52 adjacent and nonadjacent disks of 45 patients in total were analyzed according to the Pfirrmann grading systems. The average Pfirrmann rating of the disks just above and below the fused segment and the distant first, second, and third non-neighboring levels were evaluated and calculated, respectively. Results The highest rate of incidental fusion is determined on the cervical area with 51.9%, followed by the thoracal area with 32.7%, and the lumbar area with 15.4%. Damage to the adjacent segment disks in cases with incidental fusion can still be seen at any age, with fusion, indicating that the hypermobility effect plays a more prominent role. The evidence of hypermobility without aging is that the segments adjacent to fusion undergo more degeneration than the distant disks. Conclusion Adjacent segment disease is under the influence of many factors. Our findings suggest that its incidence is increasing with the pathological processes initiated by hypermobility. It seems that, at least, it carries equal importance as compared to age. Fusion surgeries damage the adjacent segments under the influence of the passage of time beyond the physiological aging of the patient.
Citation Count: 0
Advancements in MXenes and mechanochemistry: exploring new horizons and future applications
(Royal Society of Chemistry, 2024) Khosravı, Arezoo; Zarepour, A.; Nazarzadeh Zare, E.; Makvandi, P.; Khosravi, A.; Varma, R.S.; Zarrabi, A.; Genetik ve Biyomühendislik / Genetic and Bio-Engineering
MXenes, a class of two-dimensional (2D) materials derived from transition metal carbides, nitrides, and carbonitrides, have garnered significant attention due to their unique properties and potential applications in various fields, including energy storage, catalysis, and electronics. Mechanochemistry, the study of chemical reactions driven by mechanical forces, offers a novel approach to synthesize and manipulate MXenes, enhancing their properties and expanding their functional applications. This review explores the intersection of MXenes and mechanochemistry, highlighting recent advancements in the mechanochemical synthesis of MXenes and their derivatives. We discuss the mechanisms underlying the mechanochemical processes, including the role of shear forces, ball milling, and other mechanical techniques in facilitating the exfoliation and functionalization of MXenes. Furthermore, we examine the impact of mechanochemical methods on the structural integrity, surface chemistry, and electronic properties of MXenes, which are crucial for their performance in applications such as supercapacitors, batteries, and sensors. This review also addresses the challenges and limitations associated with mechanochemical approaches, including scalability and reproducibility, while proposing future directions for research in this promising field. By integrating mechanochemistry with MXene research, we aim to provide insights into innovative strategies for the development of advanced materials that can meet the demands of next-generation technologies. This synthesis of knowledge not only underscores the versatility of MXenes but also emphasizes the transformative potential of mechanochemistry in materials science. © 2024 RSC.
Citation Count: 3
Adverse Effect of Emotional Eating Developed During the COVID-19 Pandemic on Healthy Nutrition, a Vicious Circle: A cross-sectional descriptive study
(Asoc Espanola Dietistas Nutricionistas, 2021) Ozcan, Burcu Ates; Yeslikaya, Burcu
Introduction: Because of the new type of coronavirus disease (COVID-19) seen worldwide, many countries have a difficult time both in terms of health and economy. It is thought that infection and fear of death owing to the disease may cause a disturbance in the individuals' psychology. Moreover, precautions such as social distancing and quarantine to prevent the spread of the disease and the prolongation of these interventions may further aggravate the conditions, such as mood disorders and stress. This study was aimed to determine the emotional eating status of individuals during the COVID-19 pandemic and to determine its effect on a healthy eating attitude. Material and methods: This is a cross-sectional descriptive study with a total number of 578 adults without COVID-19 diagnosis and treatment (422 [73%] women, 156 [27%] men). The study was conducted using the Google Forms web survey platform. The link to the survey was shared via WhatsApp and Instagram. The participants were asked to share the study link to reach out to as many potential participants as possible throughout the nation using the method known as snowball sampling. A questionnaire form which includes sociodemographic characteristics, the Turkish version of the Emotional Eater Questionnaire (EEQ-TR), and the Attitude Scale for Healthy Nutrition (ASHN) were applied to the participants. EEQ-TR and ASHN forms were answered twice, retrospectively for the pre-COVID period and prospectively during the COVID period. Results: While average emotional eating scores increased compared to pre-COVID-19 scores, individuals shifted from low-level emotional eaters to emotional eaters (p < 0.000). On the other hand, the average ASHN scores decreased, and individuals shifted from the middle-level healthy eating attitude to a low level (p < 0.000). As the quarantine period increased, emotional eating, body weight, and body mass index (BMI) increased, and healthy eating attitude decreased (p < 0.05). Conclusions: Individuals' emotional eating increased due to social distancing, self-quarantine, or isolation in the COVID-19 pandemic. These changes are found to be effective in healthy eating in a negative way. Long-term unhealthy eating is not recommended for people's health. Therefore, it is necessary to inform individuals about stress management, healthy nutrition, the importance of regular exercise, and sleep patterns.
Citation Count: 9
AFFORDANCES OF HISTORIC URBAN LANDSCAPES: AN ECOLOGICAL UNDERSTANDING OF HUMAN INTERACTION WITH THE PAST
(Lodz Univ Press, 2014) Alves, Susana
Heritage has been defined differently in European contexts. Despite differences, a common challenge for historic urban landscape management is the integration of tangible and intangible heritage. Integration demands an active view of perception and human-landscape interaction where intangible values are linked to specific places and meanings are attached to particular cultural practices and socio-spatial organisation. Tangible and intangible values can be examined as part of a system of affordances (potentialities) a place, artefact or cultural practice has to offer. This paper discusses how an 'affordance analysis' may serve as a useful tool for the management of historic urban landscapes.
Citation Count: 8
Airborne pathogen projection during ophthalmic examination
(Springer, 2020) Bostanci Ceran, Basak; Karakoc, Alp; Taciroglu, Ertugrul
Purpose Microscale droplets act as coronaviruses (CoV) carriers in the air when released from an infected person and may infect others during close contact such as ophthalmic examination. The main objective of the present work is to demonstrate how CoV deposited droplets are projected during biomicroscopy and to discuss what kind of precautions should be taken in ophthalmic practice. Methods A coupled fluid-structure system comprising smoothed particle hydrodynamics and the finite element method has been built to assess the projection of droplets spreading from an infected person. Different conditions based on the maximum exit flow velocity from the infector's mouth during the ophthalmic examination were modeled. Results During exhalation, for which the exit flow is similar to 1000 mm/s, the average horizontal distance of the flow front was similar to 200 mm while individual particles can reach up to similar to 500 mm. In case of coughing or sneezing (corresponding to an exit flow of similar to 12,000 mm/s), the average horizontal distance of the flow front was similar to 1300 mm. Conclusion During the ophthalmic examination, the proximity to the patient's nose and mouth was observed to be less than the horizontal distance of flow front particles. Even though mounted breath shields are used, particles flew beyond the shield and contaminate the ophthalmologist. Compared with the current protective breath shields, the use of a larger shield with a minimum radius of 18 cm is needed to decrease viral transmission.
Citation Count: 4
Alpha Head on Collision with a Fixed Gold Nucleus, Taking into Account the Relativistic Rest Mass Variation as Implied by Mass-Energy Equivalence
(Polish Acad Sciences inst Physics, 2014) Yarman, Nuh Tolga; Arik, M.; Kholmetskii, A.; Altintas, A. A.; Ozaydin, F.; Enerji Sistemleri Mühendisliği / Energy Systems Engineering
We reformulate the Rutherford scattering of alpha particle for a head on collision, taking into account the rest mass variation of the particle, as implied by the energy conservation law. Our relativistic reformulation (which includes the energy conservation) constitutes a new example for the breakdown of the Lorentz invariance. Briefly speaking, even at rest or during the whole scattering process, the distance between the alpha particle and the gold nucleus is not invariant but depends on the frame of the observer attached to either object. According to our relativistic reformulation, we also provide a new set of Lorentz transformations.
Citation Count: 1
Amine-functionalized mesoporous silica nanoparticles decorated by silver nanoparticles for delivery of doxorubicin in breast and cervical cancer cells
(Elsevier, 2024) Ghobadi, Melika; Khosravı, Arezoo; Ardestani, Mohammad Taha Salmanifard; Mousavi-Khattat, Mohammad; Shakeran, Zahra; Khosravi, Arezoo; Zarrabi, Ali; Genetik ve Biyomühendislik / Genetic and Bio-Engineering
Nanocarriers have demonstrated promising potential in the delivery of various anticancer drugs and in improving the efficiency of the treatment. In this study, silver nanoparticles (AgNPs) were green-synthesized using the extracts of different parts of the pomegranate plant, including the peel, flower petals, and calyx. To obtain the most efficient extract used for the green synthesis of AgNPs, all three types of synthesized nanoparticles were characterized. Then, (3-Aminopropyl) triethoxysilane-functionalized mesoporous silica nanoparticles (MSNs-APTES) decorated with AgNPs were fabricated via a one-pot green-synthesis method. AgNPs were directly coated on the surface of MSNs-APTES by adding pomegranate extract enriched with a source of reducing agent leading to converting the silver ion to AgNPs. The MSN-APTES-AgNPs (MSNs-AgNPs) have been thoroughly characterized using nanoparticle characterization techniques. In addition, DNA cleavage and hemolysis activities of the synthesized nanoparticles were analyzed, confirming the biocompatibility of synthesized nanoparticles. The Doxorubicin (DOX, as a breast/cervical anti-cancer drug) loading (42.8%) and release profiles were investigated via UV-visible spectroscopy. The fibroblast, breast cancer, and cervical cancer cells' viability against DOX-loaded nanoparticles were also studied. The results of this high drug loading, uniform shape, and small functionalized nanoparticles demonstrated its great potential for breast and cervical cancer management.

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