آلیاژهای منیزیم معمولاً دارای عدم تقارن تسلیم در حالت کشش و فشار هستند که این عامل ناشی از سازوکارهای مختلف تغییر شکل پلاستیک فعال تحت بارگذاری‌های کششی فشاری است. مقاله بر روی شبیه‌سازی المان حجمی نماینده‌ی سه‌بعدی آلیاژ اکسترود شده تمرکز دارد تا با کمک روابط کریستال پلاستیسیته تأثیر شدت بافت پایه ـ را بررسی کند. پلاستیسته مبتنی‌بر لغزش به‌صورت یک زیربرنامه نرم‌افزار آباکوس (U‌M‌A‌T) برای آزمون...

This paper develops a fully modified OLS estimator for cointegrating polynomial regressions, i.e. for regressions including deterministic variables, integrated processes and powers of integrated processes as explanatory variables and stationary errors. The errors are allowed to be serially correlated and the regressors are allowed to be endogenous. The paper thus extends the fully modified appr...

This article deals with detection of nonconstant long memory parameter in time series. The null hypothesis presumes stationary or nonstationary time series with constant long memory parameter, typically an I(d) series with d > −.5. The alternative corresponds to an increase in persistence and includes in particular an abrupt or gradual change from I(d1) to I(d2), −.5 < d1 < d2. We discuss sever...

Data on carbon emissions, industrial output growth, population growth and FDI inflows are used for Bangladesh, Nepal and Maldives over 1972 – 2008. Time series data on all variables are nonstationary in terms of both ADF and KPSS tests with different orders of integration. As a result, ARDL model and VECM are estimated. There are evidences of cointegrating relationship among the variables, long...

&lt;p&gt;The aim of this study is to reveal the level time management thoughts pre-service teachers preparing for KPSS. For purpose, about were analysed in terms different variables. In study, survey method from quantitative research was used determine situation. 2019, Isparta and Burdur constituted group research. Voluntary 408 participated expressed their opinions. scales applied, 60 not incl...