Slant helices and Darboux helices in Myller Configuration

In this paper, we study slant helix (or $\overset{\_}{\xi}_{2}$-helix) and Darboux helix in Myller configuration $M$. We show that a curve in $M$ is a slant helix if and only if it is a Darboux helix. We give the alternative frame of a curve in $M$. Furthermore, we obtain the differential equations characterizing the curves in $M$ by means of both Frenet type frame and alternative frame.Comment: arXiv admin note: text overlap with arXiv:2305.0754

Osculating mate of a Frenet curve in the Euclidean 3-space

A new kind of partner curves called osculating mate of a Frenet curve is introduced. Some characterizations for osculating mate are obtained and using the obtained results some special curves such as slant helix, spherical helix, C-slant helix and rectifying curve are constructed

Evaluating functional capacity, and mortality effects in the presence of atrial electromechanical conduction delay in patients with systolic heart failure

Objective: Atrial functions are relatively suppressed in heart failure (HF). We aimed to investigate the associations of intra- and inter-atrial electromechanical conduction delay (EMCD) with functional class and mortality over a 12-month follow-up period. Methods: The prospective study included 65 patients with systolic HF and 65 healthy subjects with normal sinus rhythm. Left ventricular (LV) systolic functions and left atrial (LA) dimensions and volumes were evaluated by transthoracic echocardiography. Tissue Doppler imaging (TDI) signals at the lateral border of the mitral annulus (lateral PA’), septal mitral annulus (septal PA’), and tricuspid annulus (tricuspid PA’) were measured. Intra- and inter-atrial EMCD were calculated. Results: Mitral inflow velocities were studied using pulsed-wave Doppler after placing the sample volume at the leaflets’ tips. The peak early (E wave) and late (A wave) velocities were measured. The septal annular E/E’ ratio was relatively higher and lateral, septal, and right ventricular S, E’, and A’ waves were significantly lower in the HF group than in the control group (12.49±6.03 - 7.16±1.75, pE/E’ <0.0001). Intra-atrial EMCD was detected as 117.5 ms and inter-atrial EMCD as 127.5 ms in patients with prolonged atrial EMCD. A significant increase was found in prolonged intra- and inter-atrial EMCD according to functional capacity increase (p=0.012 and p=0.031, respectively). The incidence of mortality was significantly higher in patients with prolonged atrial EMCD (p=0.025), and 5 patients in the HF group died during the study over the 12-month follow-up period. Conclusions: In this study, we found a relationship between prolonged atrial conduction time and increased functional class and mortality in patients with systolic HF. © 2016 by Turkish Society of Cardiology

Primary School Students’ Attitudes toward Science Courses

Bu araştırmanın amacı ilköğretim birinci kademe dört ve beşinci sınıf öğrencilerinin fen bilgisi dersine karşı tutumlarını ortaya çıkarmaktır. Uşak’taki ilköğretim okullarından tabakalı örneklem metoduyla seçilen 832 öğrenci araştırmamızın örneklemini oluşturmuştur. Öğrencilerin tutumlarını ölçmek için 24 maddeden oluşan ve güvenirliği %81 bulunan bir ölçme aracı hazırlanmıştır. Verilerin analizi için tanımsal istatistik ve üç faktörlü varyans analizi (ANOVA) kullanılmıştır. Sonuç olarak, öğrencilerin fen bilimlerine yönelik olumlu tutuma sahip oldukları fakat ölçeğin alt boyutlarından birisi olan bilimsel bilginin doğasına yönelik olumlu tutuma sahip olmadıkları görülmüştür. Diğer taraftan öğrencilerin cinsiyeti, sınıflarına ve sosyo-ekonomik açıdan tutumlarında anlamlı farklılığa rastlanmazken, sosyo-ekonomik durumları daha iyi olan öğrencilerin tutumları olmayanlara göre daha olumlu çıkmıştır. Fen bilgisi dersi notları yüksek olan öğrencilerin tutumları olmayanlara göre anlamlı bir şekilde yüksek çıkmıştır.Advisor : Asst. Prof. Dr. Lütfullah TÜRKMEN The purpose of this study was to reveal the attitudes of 4th and 5th grade primary school students toward science course. The sample of this study was 832 students selected with the stratified sampling method from the primary schools located in the province of Uşak. 24 items open-ended attitude scale with 0.82 reliability coefficient was prepared to measure the attitudes of 4th and 5th grade students toward science course. Descriptive statistics and three-way analysis of variance (ANOVA) were employed to analyze the data of study. In the result, students have positive attitudes toward science courses but only in one sub-scale students have negative attitudes toward the nature of science. While the gender, grade levels and some socio-economic factors of students do not indicate significant difference at the base of the attitudes toward science courses, the students having better socio-economic conditions have higher positive attitudes than those of students not having. Students who have better grades in science courses have significantly higher attitudes toward science courses than those of students having low grades in science courses

Primary School Students’ Attitudes toward Science Courses

Bu araştırmanın amacı ilköğretim birinci kademe dört ve beşinci sınıf öğrencilerinin fen bilgisi dersine karşı tutumlarını ortaya çıkarmaktır. Uşak’taki ilköğretim okullarından tabakalı örneklem metoduyla seçilen 832 öğrenci araştırmamızın örneklemini oluşturmuştur. Öğrencilerin tutumlarını ölçmek için 24 maddeden oluşan ve güvenirliği %81 bulunan bir ölçme aracı hazırlanmıştır. Verilerin analizi için tanımsal istatistik ve üç faktörlü varyans analizi (ANOVA) kullanılmıştır. Sonuç olarak, öğrencilerin fen bilimlerine yönelik olumlu tutuma sahip oldukları fakat ölçeğin alt boyutlarından birisi olan bilimsel bilginin doğasına yönelik olumlu tutuma sahip olmadıkları görülmüştür. Diğer taraftan öğrencilerin cinsiyeti, sınıflarına ve sosyo-ekonomik açıdan tutumlarında anlamlı farklılığa rastlanmazken, sosyo-ekonomik durumları daha iyi olan öğrencilerin tutumları olmayanlara göre daha olumlu çıkmıştır. Fen bilgisi dersi notları yüksek olan öğrencilerin tutumları olmayanlara göre anlamlı bir şekilde yüksek çıkmıştır.Advisor : Asst. Prof. Dr. Lütfullah TÜRKMEN The purpose of this study was to reveal the attitudes of 4th and 5th grade primary school students toward science course. The sample of this study was 832 students selected with the stratified sampling method from the primary schools located in the province of Uşak. 24 items open-ended attitude scale with 0.82 reliability coefficient was prepared to measure the attitudes of 4th and 5th grade students toward science course. Descriptive statistics and three-way analysis of variance (ANOVA) were employed to analyze the data of study. In the result, students have positive attitudes toward science courses but only in one sub-scale students have negative attitudes toward the nature of science. While the gender, grade levels and some socio-economic factors of students do not indicate significant difference at the base of the attitudes toward science courses, the students having better socio-economic conditions have higher positive attitudes than those of students not having. Students who have better grades in science courses have significantly higher attitudes toward science courses than those of students having low grades in science courses

FEN BİLİMLERİ ENSTİTÜSÜ/LİSANSÜSTÜ TEZ PROJESİ

KARBORAN İÇEREN N-HETEROSİKLİK KARBENLERİN KARBONDİOKSİT YAKALANMASINDA KULLANILMAS

Hydronephrosis and pelvic rupture due to calculus with completely normal laboratory results

Both side pain and urinary system pathologies are common reasons for admission to emergency departments. Spontaneous renal pelvic rupture is also very rare. Existing renal anomalies and calculi also increase the risk of rupture. Here, we present a 50-year-old male case who developed unilateral renal pelvis rupture spontaneously without trauma

Characterization, optimization, and evaluation of preservative efficacy of carboxymethyl cellulose/hydromagnesite stromatolite bio-nanocomposite

Currently, researchers are focusing on the development of nano-additive preservatives during the worldwide COVID-19 pandemic. This research aimed to constitute a small sized preservative nano-formulation which emerges from the biopolymer carboxymethyl cellulose (a green stabilizing agent) and hydromagnesite stromatolite (a fossilized natural additive). In this study, we investigated the optimization of the experimental design of carboxymethyl cellulose/hydromagnesite stromatolite (CMC/HS) bio-nanocomposites using a green and one-step sonochemical method at room temperature. In addition, we constructed a mathematical model which relates the intrinsic viscosity with all operating variables, and we carried out statistical error analysis to assess the validity of the proposed model. The characterization and chemical functional groups of CMC/HS bio-nanocomposites were determined by different advanced techniques such as SEM, HRTEM, DLS, FTIR, XRD, and BET. The challenge test was used to show the preservative efficacy of CMC/HS bio-nanocomposites against Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Candida albicans, and Aspergillus brasiliensis. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltrazolium bromide (MTT) assay was performed on L929 cells to evaluate the in vitro cytotoxicity of CMC/HS bio-nanocomposites. According to the results, we showed that the synthesized CMC/HS bio-nanocomposites have no cytototoxic effects on L929 fibroblast cells and could be considered to be an alternative green nano-additive preservative against pathogenic microorganisms

Comparison of pulmonary autopsy findings of the rats drowned at surface and 50 ft depth

Introduction: When a body is recovered from the water after a fatal SCUBA diving accident, it is useful to know if the diver was under pressure or not when he/she took his/her last breath, in order to determine the cause and manner of the death. If the victim was under pressure, the air remained in the lungs of the diver will be equal to the environmental pressure. If the body comes to the surface, the air in the lung will expand according to the Boyle's Gas Law and give mechanical damage to the surrounding tissues, due to decreases in environmental pressure. We designed an experimental study to see the difference in pulmonary autopsy findings of the rats that drowned under normobaric and hyperbaric conditions