A relation among DS^{2}, TS^{2} and non-cylindrical ruled surfaces

$TS^{2}$ is a differentiable manifold of dimension 4. For every $Xin TS^{2}$, if we set $X=(p,x)$ we have $=0$ since $vec{p}$ is orthogonal to $T_{p}S^{2}$, therefore $parallel vec{p}parallel =1$. Those there could exist a one-to-one correspondence between $TS^{2}$ and $DS^{2}$. In this paper we gave and studied a one-to-one correspondence among $TS^{2}$, $DS^{2}$ and a non cylindrical ruled surface. We showed that for a restriction of an anti-symmetric linear vector field A along a spherical curve $alpha (t)$ there exists a non-cylindrical ruled surface which corresponds to $alpha (t)$ and has the following prametrization [alpha (t,lambda )=alpha (vec{t})+A(alpha (t))+lambda alpha (vec{t})] So it is possible to study non-cylindrical ruled surfaces as the set of $(alpha (t),A(alpha (t)))$, where $alpha (t)in S^{2}$ and $A$ is an anti-symmetric linear vector field in ${cal R}^{3}$

Turkish EFL learners’ perceptions of native English-speaking teachers and non-native English-speaking teachers in higher education

The question of what makes a good teacher of English has aroused researchers’ interest for many years, and the existing studies comparing NESTs (native English-speaking teachers) and NNESTs (non-native English-speaking teachers) have focused mostly on students’ perceptions of these teachers. The current study aims to explore in the first phase if there is a meaningful difference between Turkish EFL learners’ perceptions of NESTs and NNESTs on their first encounter with them. The second phase explores whether any changes have occurred in students’ preconceptions regarding NESTs within the course of time. The participants are 120 Turkish monolinguals from a private university. Quantitative data was collected through questionnaires consisting of Likert-scale items in both phases. An interview session was added to the second phase to obtain more in-depth insights into students’ perceptions. The findings showed that students had neutral perceptions of NESTs and NNESTs. However, in the second phase, the data analysed via qualitative content analysis demonstrated that students’ perceptions were found to have positively changed for NESTs, particularly in terms of personality dimension. In both phases, students perceived NESTs in linguistic and professional dimensions, and NNESTs in pedagogical dimension rather positively.publisher versio

Capital Fixity and Mobility in Response to the 2008-09 Crisis: Variegated Neoliberalism in Mexico and Turkey

The article examines the 2008-9 crisis responses in Mexico and Turkey as examples of variegated neoliberalism. The simultaneous interests of corporations and banks relative to the national fixing of capital and their mobility in the form of global investment heavily influenced each state authority’s policy responses to the crisis at the expense of the interests of the poor, workers, and peasantry. Rather than pitching this as either evidence of persistent national differentiation or some Keynesian state resurgence, we argue from a historical materialist geographical framework that the responses of capital and state authorities in Mexico and Turkey actively constitute and reconstitute the global parameters of market regulatory design and neoliberal class rule through each state’s distinct domestic policy formation and crisis management processes. While differing in specific content the form of Mexico and Turkey’s state responses to the crisis ensured continuity in their foregoing neoliberal strategies of development and capital accumulation, most notably in the continued oppression of workers. That is, the prevailing strategy of accumulation continues to be variegated neoliberalism

Machine-based classification of ADHD and nonADHD participants using time/frequency features of event-related neuroelectric activity

Objective Attention-deficit/hyperactivity disorder (ADHD) is the most frequent diagnosis among children who are referred to psychiatry departments. Although ADHD was discovered at the beginning of the 20th century, its diagnosis is still confronted with many problems. Method A novel classification approach that discriminates ADHD and nonADHD groups over the time-frequency domain features of event-related potential (ERP) recordings that are taken during Stroop task is presented. Time-Frequency Hermite-Atomizer (TFHA) technique is used for the extraction of high resolution time-frequency domain features that are highly localized in time-frequency domain. Based on an extensive investigation, Support Vector Machine-Recursive Feature Elimination (SVM-RFE) was used to obtain the best discriminating features. Results When the best three features were used, the classification accuracy for the training dataset reached 98%, and the use of five features further improved the accuracy to 99.5%. The accuracy was 100% for the testing dataset. Based on extensive experiments, the delta band emerged as the most contributing frequency band and statistical parameters emerged as the most contributing feature group. Conclusion The classification performance of this study suggests that TFHA can be employed as an auxiliary component of the diagnostic and prognostic procedures for ADHD. Significance The features obtained in this study can potentially contribute to the neuroelectrical understanding and clinical diagnosis of ADHD. © 2017 International Federation of Clinical Neurophysiolog

Perforated mixed carcinoid-adenocarcinoma in transverse colon and at gastroenterostomy site: case report

Goblet cell carcinoid of the large intestine is a rare neoplasm, usually located in ascending colon and rectum. A 60-year-old male patient underwent surgery after the diagnosis of acute abdomen. Exploratory laparotomy revealed perforation with a diameter of 1 cm at the site of the previously performed gastroenterostomy and dilatation of the right colic flexure, secondary to a solid obstructive mass located in the mid-portion of transverse colon. Histopathological investigation of the biopsies, taken from the gastroenterostomy site and the tumor, revealed mixed carcinoid-adenocarcinoma with carcinoid component, predominantly composed of goblet cells. Three cycles of FOLFOX-4 protocol was administered. Following respiratory distress secondary to pulmonary metastasis, the patient's condition deteriorated and subsequently died in the fourth postoperative month. Our aim with this paper is to point out that more cases should be reported for more effective diagnosis, histopathological study, clinical investigation, treatment and prognosis of this specific neoplasm

A glucose biosensor based on novel Lutetium bis-phthalocyanine incorporated silica-polyaniline conducting nanobeads

The facile preparation of highly sensitive electrochemical bioprobe based on lutetium 13 phthalocyanine incorporated silica nanoparticles (SiO2(LuPc2)) grafted with Poly(vinyl 14 alcohol-vinyl acetate) itaconic acid (PANI(PVIA)) doped polyaniline conducting nanobeads 15 (SiO2(LuPc2)PANI(PVIA)-CNB) is reported. The preparation of CNB involves two stages (i) 16 pristine synthesis of LuPc2 incorporated SiO2 and PANI(PVIA); (ii) covalent grafting of 17 PANI(PVIA) onto the surface of SiO2(LuPc2). The morphology and other physico-chemical 18 characteristics of CNB were investigated. The scanning electron microscopy images show 19 that the average particle size of SiO2(LuPc2)PANI(PVIA)-CNB was between 180-220 nm. 20 The amperometric measurements showed that the fabricated SiO2(LuPc2)PANI(PVIA)-21 CNB/GOx biosensor exhibited wide linear range (1-16 mM) detection of glucose with a low 22 detection limit of 0.1 mM. SiO2(LuPc2)PANI(PVIA)-CNB/GOx biosensor exhibited high 23 sensitivity (38.53 μA mM−1 cm−2) towards the detection of glucose under optimized 24 conditions. Besides, the real (juice and serum) sample analysis based on a standard addition 25 method and direct detection method showed high precision for measuring glucose at 26 SiO2(LuPc2)PANI(PVIA)-CNB/GOx biosensor. The SiO2(LuPc2)PANI(PVIA)-CNB/GOx 27 biosensor stored under refrigerated condition over a period of 45 days retains ~ 96.4 % 28 glucose response current