We consider the problem of identifying sharp criteria under which radial H (finite energy) solutions to the focusing 3d cubic nonlinear Schrödinger equation (NLS) i∂tu + ∆u + |u|2u = 0 scatter, i.e. approach the solution to a linear Schrödinger equation as t → ±∞. The criteria is expressed in terms of the scale-invariant quantities ‖u0‖L2‖∇u0‖L2 and M [u]E[u], where u0 denotes the initial data,...

This study examines the relationship between both first language (L1) and second language (L2) reading attitudes, and learners' performance in L2 extensive reading. Four reading attitude variables were identified (Comfort, Anxiety, Value, Self-perception), both in L1 and L2, according to learners' responses to a questionnaire. Results of analyses using these four variables are summarised on two...

Interneurons play a key role in cortical function and dysfunction, yet organization of cortical interneuronal circuitry remains poorly understood. Cortical Layer 1 (L1) contains 2 general GABAergic interneuron groups, namely single bouquet cells (SBCs) and elongated neurogliaform cells (ENGCs). SBCs predominantly make unidirectional inhibitory connections (SBC→) with L2/3 interneurons, whereas ...

به علت تغییرات حجم ناشی از خطای ساخت، فرکانس کاواک‌های شتاب‌دهی در شتاب‌دهنده‌های خطی الکترون تغییر می‌کند. نتیجه تنظیم فرکانسی کاواک‌ها یکی مراحل مهم تست سرد است که باید الزامات آن طراحی لحاظ شود. پروژه ساخت ساختار موج‌ایستا برای شتاب­دهنده با دو انرژی، پس طراحی، یک آلومینیمی (شامل نیم کاواک و تزویج) ساخته شد. این جبران پیچ‌های استفاده پیچ‌ها جزیی کاواک‌ها، آن‌ها را می‌دهند. مقاله محاسبات شبیه...

طیف گامای آنی تولید شده حین تابش پروتون به بافت، برای آنالیز عنصری بافت تحت درمان کار گرفته می‌­شود. هدف اصلی این در پروتون­درمانی ردیابی غلظت اکسیژن تومور است. پایش برخط تغییر عنصر پزشک را سمت ارزیابی روند بهبود و تخمین پاسخ بدن بیمار هدایت می‌­کند. مطالعه گاما یک فانتوم چشم انسان آشکارساز HPGe با استفاده از ابزار Geant4 شبیه‌سازی ­کارگیری شبکه عصبی انجام شد. 33 نمونه حاوی تومورهای متفاوت نظر ...

In Dörnyei’s (2009a) theorizing, motivation is conceptualized to be generated by discomfort associated with the learner’s experience of a discrepancy between their current L2 self, and their ideal L2 self. However, in the L2 Motivational Self System, this discrepancy is not operationalized. A questionnaire containing measures of current L2 selves was administered to two cohorts of students lear...

The aim of the paper is to study the production of Estonian vowel categories by L2 speakers of Estonian with a Russianlanguage background and to compare the results with perception data from the same subjects. Ten native Estonian subjects and ten L2 speakers participated in both the reading of an Estonian text corpus and the perception experiment. It was found that mostly the production and per...

In L2 development, the cognitive complexity of tasks plays a crucial role in task performance and language features produced. However, there have only been few studies addressing the impact of task complexity on EFL learners' attention to L2 system and form-focused self-repairs (FFS).This study explores the role of increasing cognitive task complexity in EFL learners' form-focused attention (FF...

Since Heubner's (1985) pioneering study, there have been many studies on (mis) use/ non-use of articles by L2 learners from article-less and article languages. The present study investigated how Persian L2 learners of English produce and interpret English definite descriptions and demonstrative descriptions. It was assumed that definite and demonstrative descriptions share the same central sema...

The practice of developing and testing second language (L2) reading must follow as clear an understanding of this skill as possible, and such an understanding must be a result of rigorous research, both theoretical and empirical. Comparisons have been made between applied linguistic research on L2 reading and cognitive psychological research on L1 reading, both of which directly or indirectly c...