Strings through the Microscope *

بررسی تکنیک بافت دست بافت های عشایر فارس بافته های منسوخ شده

This study examines weaving techniques in three rare samples of Ghashghaei tribe hand-woven artifacts. Two first samples, “Shishe dermeh baafi” and “O’ei baafi” (2 laaye baafi) we found similarities and differences in the weaving structures, which are: Similarities: Both are hand-woven products woven through flat weaving, having two opposite colours warp and woof. ...

The Analytic Technique and Experimental Research Methods of Post-buckling about Slender Rod Strings in Wellbore

The buckling behavior of rod strings in wellbore is one of the key issues in petroleum engineering. The slender rod strings in vertical wellbore were selected as research objects. Based on the energy method, the critical load formulas of sinusoidal and helical buckling were derived for the string with the bottom of the wellbore pressure. According to the sinusoidal and helical buckling’s geomet...

A Fast and Accurate Global Maximum Power Point Tracking Method for Solar Strings under Partial Shading Conditions

This paper presents a model-based approach for the global maximum power point (GMPP) tracking of solar strings under partial shading conditions. In the proposed method, the GMPP voltage is estimated without any need to solve numerically the implicit and nonlinear equations of the photovoltaic (PV) string model. In contrast to the existing methods in which first the locations of all the local pe...

ar X iv : g r - qc / 0 31 20 38 v 2 2 0 Ju l 2 00 4 Strings and Branes under Microscope

It is shown that in the standard vacuum 5D Kaluza-Klein gravity there is wormhole-like solutions which look like strings attached to two D-branes. The asymptotical behaviour of the corresponding metric is investigated.

Study on Linear Density Effect on the Vibration Behavior of Textile Strings Using Video Processing