WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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

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4/3 problem, Poynting theorem, and electromagnetic energy-momentum tensor
(Canadian Science Publishing, 2015) Kholmetskii, Alexander L.; Missevitch, Oleg V.; Yarman, Tolga
We show that the familiar 4/3 problem originates from the incorrect determination of the momentum of the electromagnetic field generated by an isolated charged particle, which results from an incorrect application of the Poynting theorem to the field. To demonstrate this, we consider a macroscopic problem: splitting a charged oil droplet into two identical smaller droplets in the rest frame K of the original droplet, and in another inertial frame K' moving with respect to K with some constant velocity, and arrive at a physically senseless solution in the framework of the standard approach. To solve this problem in a correct way, we suggest a modified Poynting theorem for an isolated charge and recalculate the momentum of the electromagnetic field of this charge, which yields the usual relativistic relationship between the field energy and momentum. Our approach is not at odds with the idea about "Poincare stresses"; however, in contrast to the standard method, it provides a usual relationship between the "Poincare stress-energy" and the associated momentum stress component. Finally, the continuity equation in four-dimensional form for the case of isolated moving charge is also proposed, which completely resolves the 4/3 problem.
Abnormal Right Ventricular to Pulmonary Artery Coupling in Patients with End-Stage Kidney Disease and Normalization After Renal Transplantation: A Observational Study
(Karger, 2025) Cetin Guvenc, Rengin; Guvenc, Tolga Sinan; Karakaya, Ezgi Sude; Acik, Hasan; Korkmaz, Aysu; Salem, Abdul Fattah; Gurkan, Alp
Introduction: Pulmonary hypertension and right ventricular (RV) dysfunction are associated with an increase in mortality and worse prognosis in patients with end-stage kidney disease (ESKD), but pathophysiologic mechanisms underlying the progression of RV dysfunction remain incompletely understood. The present study aimed to understand right ventricular to pulmonary artery (RV-PA) coupling, which is an early indicator of transition to RV dysfunction, to better characterize adaptive RV response to increased afterload in ESKD patients and changes in RV-PA coupling following renal transplantation. Methods: One hundred eleven patients with ESKD, including 49 patients scheduled for renal transplantation, underwent a detailed echocardiographic examination and measurement of tricuspid annular plane excursion to pulmonary artery systolic pressure (TAPSE/PASP) ratio, and a repeat examination was performed 6 months after the baseline examination. Results: Patients with ESKD had significantly lower TAPSE/PASP ratio at baseline (1.02 [0.71-1.63] vs. 1.29 [1.09-1.96], p < 0.001). In 40 patients that underwent transplantation, TAPSE/PASP ratio increased significantly from (0.97 [0.72-1.42] to 1.30 [1.01-1.82], p = 0.03), while in 27 patients remained on dialysis, there was a nonsignificant reduction in TAPSE/PASP ratio (1.21 [0.71-1.62] vs. 0.84 [0.61-1.38], p = 0.44). The change in TAPSE/PASP ratio correlated significantly with the change in pulmonary vascular resistance (OR: 0.61, 95% CI: 0.51-0.72, p < 0.001) and left ventricular mass index (OR: 0.97, 95% CI: 0.96-0.99, p = 0.001) after adjustment. Conclusions: Patients with ESKD had abnormal RV-PA coupling, as indicated by a reduced TAPSE/PASP ratio, which normalizes 6 months after renal transplantation.
Abstract Elliptic Equations with Integral Boundary Conditons
(Shanghai Scientific Technology Literature Publishing House, 2016) Shakhmurov, Veli
This paper focuses on nonlocal integral boundary value problems for elliptic differential-operator equations. Here given conditions guarantee that maximal regularity and Fredholmness in L-p spaces. These results are applied to the Cauchy problem for abstract parabolic equations, its infinite systems and boundary value problems for anisotropic partial differential equations in mixed L-p norm.
Accuracy of Digital Impressions Obtained Using Six Intraoral Scanners in Partially Edentulous Dentitions and the Effect of Scanning Sequence
(Quintessence Publishing Co inc, 2021) Diker, Burcu; Tak, Onjen
Purpose: To compare the accuracy of six intraoral scanners in two different partially edentulous maxillary models and to evaluate the effect of scanning sequence on accuracy. Materials and Methods: Maxillary Kennedy Class I and Class IV situations were used as reference models. The reference datasets were obtained by scanning the models using a highly accurate industrial scanner (ATOS Core 80, GOM). The following six intraoral scanners were evaluated: Trios 3 (3Shape), iTero Element 2 (Align Technology), Emerald (Planmeca), CEREC Omnicam (Dentsply Sirona), CEREC Primescan (Dentsply Sirona), and Virtuo Vivo (Dental Wings). A total of 120 scans from both models were obtained using the six intraoral scanners and divided into two groups based on scanning sequence. Accuracy was evaluated by deviation analysis using 3D image processing software (Geomagic Studio 12, 3D Systems). Kruskal Wallis and Mann-Whitney U tests were performed (P <= .05) for statistical analysis. Results: There were significant differences in the accuracy of digital impressions among intraoral scanners and scanning sequences. The trueness of the Trios scanner and the precision of the Trios, Primescan, and iTero scanners were significantly higher than for the other scanners. The Emerald had the lowest accuracy among the six intraoral scanners tested. Accuracy was affected by scanning sequence when using the Virtuo Vivo, Emerald, Primescan, and iTero. Conclusion: In Kennedy Class I and Class IV partially edentulous cases, it is useful to consider that the intraoral scanner used may affect the accuracy of the digital impression.
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.
Adaptation, validity, and reliability of the metacognition questionnaire-30 for the Turkish population, and its relationship to anxiety and obsessive-compulsive symptoms
(Turkiye Sinir ve Ruh Sagligi dernegi, 2008) Tosun, Ahmet; Irak, Metehan
Objective: The present study aimed to evaluate the psychometric properties of the short form of the Metacognition Questionnaire (MCQ-30) in a population of Turkish university students. The metacognitions questionnaire (MCQ) measures individual differences in a selection of metacognitive beliefs, judgments, and monitoring tendencies considered important in the metacognitive model of psychological disorders. Method: The study included 850 university students from 15 Turkish universities. Mean age age of the participants was 21.22 years, 282 (33.17%) were female, and 558 (66.82%) were male. Results: Construct validity was evaluated by exploratory and confirmatory factor analysis (CIA). Exploratory factor analysis revealed that the Turkish version of MCQ-30 has 5 components, which is some factor structure as the original form. In addition, the fit indices of CIA suggested an acceptable fit to a 5-factor model consistent with the original MCQ-30. The Turkish MCQ-30 showed acceptable to good test-retest reliability, internal consistency, and convergent validity. Significant positive relationships between the subscales of MCQ-30 and measures of anxiety and obsessive-compulsive symptoms provided further support for the convergent validity of the Turkish version. Moreover significant negative correlations were observed between age and the MCQ-30 subscales, and the effect of gender was significant on some of the subscales. Conclusion: The psychometric properties of the Turkish version of MCQ-30 showed that the instrument is a valuable additional tool for the assessment of metacognition in Turkey.
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.
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.
Advancing dentistry: fractal assessment of bone health in pediatric patients with celiac disease using dental images
(Quintessence Publishing Co inc, 2023) Bulut, Muge; Tokuc, Muge; Aydin, Merve Nur; Civan, Hasret Ayyildiz; Polat, Esra; Dogan, Guzide; Beser, Omer Faruk
Objectives: To assess the effects of a gluten-free diet on bone structure in children with celiac disease using fractal analysis on panoramic radiographs. Method and materials: A total of 49 patients with celiac disease aged 6 to 13 years, separated into two groups as previously and newly diagnosed, and a control group of 32 healthy individuals were evaluated. In previously and newly diagnosed patients with celiac disease, body mass index Z-scores were calculated, calcium, alkaline phosphatase, vitamin D3, and parathormone levels were measured, and bone mineral density Z-scores were obtained from dual energy x-ray absorpti-ometry. In all patients, the fractal dimensions of the right and left temporomandibular condyles were evaluated with the fractal analysis method on panoramic radiographs. Results: The mean values of serum biomarker levels and the body mass index and bone mineral density Z-scores for both celiac groups were within the normal reference range. No statistically significant difference was determined between right and left condyle fractal dimen-sions values in the three groups examined. In terms of both right and left condyle fractal dimensions values, there was a statis-tically significant difference between groups. The highest fractal dimensions values were determined in the previously diagnosed group. Conclusions: Differences in fractal dimensions values were observed among patients with celiac disease following the glu-ten-free diet. Utilizing fractal analysis on panoramic radiographs can prove valuable for dental practitioners in evaluating bone min-eral density due to its cost-effect iveness, easy accessibility, and reduced radiation exposure for patients, enabling them to provide comprehensive oral health care and potential early interventions for patients with celiac disease. (Quintessence Int 2023;54: 822-831; doi:
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.
Alterations in right ventricular mechanics in patients with Behcet's disease
(Springer, 2022) Dinc Asarcikli, Lale; Saritas, Fatih; Guvenc, Tolga Sinan; Can, Fatma; Sert, Sena; Cetin Guvenc, Rengin; Unal, Sennur
Manifest myocardial involvement is somewhat rare in patients with Behcet's disease (BD), although echocardiographic studies suggest that subclinical alterations in left ventricular (LV) contractility is rather common. Data on right ventricular (RV) involvement in BD is rather scarce. This study aims to determine whether RV systolic performance is affected in BD patients, and to understand the clinical and echocardiographic correlates of RV contractility in these patients. Forty-five patients who fulfilled criteria for BD and 45 age and gender matched controls were enrolled. All participants underwent a comprehensive echocardiographic examination, including deformation imaging, to characterize RV mechanics. Conventional morphologic and echocardiographic indicators of RV morphology and function were not different between groups, but RV apical strain and RV free wall strain (FWS) were significantly lower in BD patients as compared to the controls (P < 0.001 and P = 0.02, respectively). The only significant correlates of FWS were tricuspid regurgitation velocity and related indices in healthy controls, while FWS correlated with LV global longitudinal strain (GLS), morphologic measures of left and right atria and ventricles, and with conventional measures of right ventricular contractility. The relationship between FWS and GLS remained statistically significant after adjusting for other clinical and echocardiographic parameters (beta = 0.379, P = 0.01). In patients with BD, there is a subclinical alteration in RV contractility and the degree of alteration in the RV systolic performance paralleled that of LV. Thus, present results support the presence of RV involvement in these patients.
Amelioration of propionic acid-induced autism spectrum disorder in rats through dapagliflozin: The role of IGF-1/IGFBP-3 and the Nrf2 antioxidant pathway
(Pergamon-elsevier Science Ltd, 2024) Erdogan, Mumin Alper; Nesil, Pemra; Altuntas, Ilknur; Sirin, Cansin; Uyanikgil, Yigit; Erbas, Oytun
The biological effects of dapagliflozin, a sodium-glucose cotransporter-2 (SGLT2) inhibitor, reveal its antioxidant and anti-inflammatory properties, suggesting therapeutic benefits beyond glycemic control. This study explores the neuroprotective effects of dapagliflozin in a rat model of autism spectrum disorder (ASD) induced by propionic acid (PPA), characterized by social interaction deficits, communication challenges, repetitive behaviors, cognitive impairments, and oxidative stress. Our research aims to find effective treatments for ASD, a condition with limited therapeutic options and significant impacts on individuals and families. PPA induces ASD-like symptoms in rodents, mimicking biochemical and behavioral features of human ASD. This study explores dapagliflozin's potential to mitigate these symptoms, providing insights into novel therapeutic avenues. The findings demonstrate that dapagliflozin enhances the activation of the nuclear factor erythroid 2-related factor 2 (Nrf2) antioxidant pathway and increases levels of neurotrophic and growth factors such as brainderived neurotrophic factor (BDNF), insulin-like growth factor-1 (IGF-1), and insulin-like growth factorbinding protein-3 (IGFBP-3). Additionally, dapagliflozin reduces pro-inflammatory cytokines, including tumor necrosis factor-alpha (TNF-alpha) and interleukin-17 (IL-17), and decreases the oxidative stress marker malondialdehyde (MDA). Dapagliflozin's antioxidant properties support cognitive functions by modulating apoptotic mechanisms and enhancing antioxidant capacity. These combined effects contribute to reducing learning and memory impairments in PPA-induced ASD, highlighting dapagliflozin's potential as an adjunctive therapy for oxidative stress and inflammation-related cognitive decline in ASD. This study underscores the importance of exploring new therapeutic strategies targeting molecular pathways involved in the pathophysiology of ASD, potentially improving the quality of life for individuals affected by this disorder.
Analysis of complications following posterior vertebral column resection for the treatment of severe angular kyphosis greater than 100°
(Turkish Assoc Orthopaedics Traumatology, 2017) Atici, Yunus; Balioglu, Mehmet Bulent; Kargin, Deniz; Mert, Muhammed; Albayrak, Akif; Kaygusuz, Mehmet Akif
Objective: The aim of this study was to evaluate the complications, efficacy and safety of posterior vertebral column resection (PVCR) in severe angular kyphosis (SAK) greater than 100 degrees. Methods: The medical records of 17 patients (mean age 17.9 (range, 9-27) years) with SAK who underwent PVCR, were reviewed. Mean follow-up period was 32.2 (range, 24-64) months. Diagnosis of the patients included congenital kyphosis in 11 patients, post-tuberculosis kyphosis in 3 patients and neurofibromatosis in 3 patients. The sagittal plane parameters (local kyphosis angle, lumbar lordosis, sagittal vertical axis, pelvic tilt, sacral slope and pelvic incidence) were measured in the preoperative and the early postoperative periods and during the last follow-up on the lateral radiographs. Results: The mean preoperative localized kyphosis angle was 121.8 degrees (range, 101 degrees-149 degrees). The mean local kyphosis angle (LKA) was 71.5 degrees at postoperatively evaluation (p < 0.05). Complications were detected in 12 patients (70.6%) with spinal shock in 4 patients, hemothorax in 3 patients, postoperative infection in 2 patients, dural laceration in 2 patients, neurological deficit in 2 patients (1 paraplegia and 1 root injury), the shifted cage in 2 patients and rod fracture in 2 patients. Neurological events occurred in six patients (35%) with temporary neurological deficit in 5 patients and permanent neurological deficit in 1 patient. Conclusion: PVCR is an efficient and a successful technique for the correction of SAK. However, it can lead to a large number of major complications in SAK greater than 100 degrees. Level of evidence: Level IV, therapeutic study. (C) 2017 Turkish Association of Orthopaedics and Traumatology. Publishing services by Elsevier B.V.
Analysis of the effects of subthalamic nucleus deep brain stimulation on somatosensation in Parkinson's disease patients
(Springer-verlag Italia Srl, 2020) Huzmeli, Esra Dogru; Yilmaz, Atilla; Okuyucu, Esra
Objective Despite the subthalamic nucleus (STN) deep brain stimulation (DBS) is a treatment commonly used to ameliorate the motor symptoms of Parkinson's disease (PD), its effects on somatosensation is unclear. The purpose of this study was to investigate the potential effects of DBS on temperature, proprioceptive, tactile, exteroceptive, pain and cortical sensations, and odor identification in PD patients. Methods The study included 14 patients (with a mean age of 59.78 +/- 11.03 years; range, 44-70 years) with idiopathic PD who underwent DBS surgery for movement disorders caused by PD at the same Neurosurgery Department. All patients were tested while DBS was turned on (DBS-ON) and off (DBS-OFF). To clearly observe the effect of removing stimulation off, DBS devices were turned off by experimental clinical personnel for a minimum duration of 30 min prior to examination. Temperature, proprioceptive, tactile, exteroceptive, pain and cortical sensations, and odor identification were examined. Results We found that two-point discrimination was significantly lower during DBS-ON than DBS-OFF (p = 0.031). Tactile sensation and kinesthesia deviation degree were lower during DBS-ON than DBS-OFF, but were non-significant (p > 0.05). The number of correct answers on an assessment of graphesthesia was higher during DBS-ON, but was non-significant as well (p > 0.05). Odor identification was better during DBS-OFF. Conclusions DBS may have an effective role to improve somatosensation and DBS-related benefits may not be explained by improvements in motor function alone, but rather by enhanced somatosensory processing. Further studies with larger study groups are needed.
Anatomical and Morphometric Features of the Profunda Brachii Artery
(Medrang, 2024) Sanliturk, Yuesra Nur; Zeybek, Nursen; Gayretli, Ozcan; Ozturk, Adnan
When the literature is examined, studies evaluating the profunda brachii artery (PBA) are limited as most studies only investigate the artery's origin. In 44 upper extremities belonging to 24 human anatomical specimens, single and double PBAs were observed in 39 and five cases, respectively. In cases with a single PBA, the origin was the brachial artery (BA) in 35 cases and the posterior circumflex humeral artery in four cases. In cases with double PBAs, the artery's origin was the BA. Morphometric measurements of single and double arteries originating from the first branch BA were evaluated separately and compared according to sex and side. Our study, in which the PBA was examined morphologically and morphometrically, contributes to the literature anatomically and radiologically in treating humerus fractures and lateral arm-flap applications by surgeons.
Anatomical Relationship Between the Profunda Brachii Artery and the Radial Nerve at the Entrance and Within the Radial Groove
(Springer France, 2025) Sanliturk, Yusra Nur; Gayretli, Ozcan; Zeybek, Nursen; Ozturk, Adnan
PurposeIn this study, it was aimed to examine the relationship between the profunda brachii artery and the radial nerve at the entrance to and within the radial groove considering no comparable study was found in the literature.MethodDissection was performed in 44 upper extremities (21 right and 23 left) of 24 fixed cadavers used for medical education at Istanbul University, Istanbul Medical Faculty, Department of Anatomy.ResultsProfunda brachii artery was found to be a single artery in 39 extremities and a double artery in 5 extremities. In 27 cases with single PBA, the nerve was located superolateral to the PBA (Type A), and in 8 cases the nerve was located inferomedial to the PBA (Type B). In all 5 extremities with double profunda brachii artery, the proximal branch was superolateral (Type A) and the distal branch was inferomedial (Type B).ConclusionsThis research will support surgeons understanding how to better anatomically and radiologically treat humeral fractures and lateral arm flap applications.
Anisotropic Differential Operators with Parameters and Applications
(Springer, 2014) Shakhmurov, V. B.
In the paper, we study the boundary-value problems for parameter-dependent anisotropic differential-operator equations with variable coefficients. Several conditions for the uniform separability and Fredholmness in Banach-valued L (p) -spaces are given. Sharp uniform estimates for the resolvent are established. It follows from these estimates that the indicated operator is uniformly positive. Moreover, it is also the generator of an analytic semigroup. As an application, the maximal regularity properties of the parameter-dependent abstract parabolic problem and infinite systems of parabolic equations are established in mixed L (p) -spaces.
Apical debris extrusion of full-sequenced rotary systems in narrow ribbon-shaped canals
(Wiley, 2022) Al Omari, Taher; El-Farraj, Hamza; Arican, Burcin; Atav Ates, Ayfer
The apically extruded debris caused by TruNatomy System (TRN), RACE EVO system (RE) and VDW Rotate (VR) systems in mandibular anterior teeth with ribbon-shaped root canals were compared. The root canals (n = 20 in each group) were irrigated with NaOCl 2.5%, and the extruded debris was collected at pre-weighted Eppendorf tubes. The amount of apically extruded debris (mg) and the treatment time (s) were recorded. Tukey pairwise comparisons were performed to compare groups with a 95% confidence level. VR had significantly less debris extrusion values and treatment time than RE and TRN (P < 0.05). Although no difference was observed between RE and TRN in terms of apically extruded debris (P > 0.05), a significant difference in favour of RE was observed in terms of treatment time (P < 0.05). All the instruments extruded debris at varying weights.
Apparent paradoxes in classical electrodynamics: a fluid medium in an electromagnetic field
(Iop Publishing Ltd, 2008) Kholmetskii, A. L.; Yarman, T.
In this paper we analyse a number of teaching paradoxes of classical electrodynamics, dealing with the relativistic transformation of energy and momentum for a fluid medium in an external electromagnetic field. In particular, we consider a moving parallel plate charged capacitor, where the electric attraction of its plates is balanced by the pressure of gas convicted between the plates.
Apparent paradoxes in classical electrodynamics: relativistic transformation of force
(Iop Publishing Ltd, 2007) Kholmetskii, A. L.; Yarman, T.
In this paper, we analyse a number of paradoxical teaching problems of classical electrodynamics, dealing with the relativistic transformation of force for complex macro systems, consisting of a number of subsystems with nonzero relative velocities such as electric circuits that change their shape in the course of time.

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