This paper describes a technique for determining the position of the friction stir welding (FSW) tool with respect to the weld seam during welding. This technique is proposed for online misalignment detection or as a position estimator for in-process tracking of the weld seam for FSW.

The end of fife (EoL) new aircraft panels made Al-Li alloys in which the stringers and skin were joined, either by laser beam welding (LBW) or friction stir (FSW), was investigated at lab scale. Different cutting strategies, ranging from only for size reduction to full separation all materials, including removal welded seam, defined, with objective recycling maximum amount panel scrap back into...

Asymmetric cell division is critical during development, as it influences processes such as cell fate specification and cell migration. We have characterized FRK-1, a homolog of the mammalian Fer nonreceptor tyrosine kinase, and found it to be required for differentiation and maintenance of epithelial cell types, including the stem cell-like seam cells of the hypodermis. A genomic knockout of f...

In gen(-, ral ,a seam may f ai I as a result of longitudinal or transverse loading. Previous workers have reported transverse seam strength to be a prime requirement in most cases of Joining woven fabrics by the means of sewn seams. Transverse seam breaks can be divided into two types: Type I in which only the sewinq thread breaks (with Lhe fabric undamaged); and Irype II in which only the fabr...

The methods of numerical simulation and on-site measurement is used to analysis reasonable coal pillar width (CPW) roadway support in isolated panel extra-thick seam. Numerical modeling shows that a maximum vertical stress 32.9 MPa, concentration factor reaches 2.99, which more affected by the mining adjacent panel, peak on both sides higher. By comparing failure deformation characteristics dif...

BACKGROUND The development of a connection between the uterus and the vulva in the nematode Caenorhabditis elegans requires specification of a uterine cell called the utse, and its attachment to the vulva and the epidermal seam cells. The uterine pi cells generate the utse and uv1 cells, which also connect the uterus to the vulva. The uterine anchor cell (AC) induces the vulva through LIN-3/epi...

The Caenorhabditis elegans GATA transcription factor elt-1 has previously been shown to have a central role in the specification of hypodermal (epidermal) cell fates and acts several cell divisions before the birth of hypodermal cells. Here we report that elt-1 also has essential functions during subsequent development. Reporter gene studies show that elt-1 expression is maintained in lateral s...

5-Diazo Meldrum's acid (DMA) undergoes a photo-induced Wolff rearrangement (WR). Recent gas-phase experiments have identified three photochemical products formed in a sub-ps scale after irradiation, a carbene formed after nitrogen loss, a ketene formed after WR and a second carbene formed after nitrogen and CO elimination (A. Steinbacher, et al. Phys. Chem. Chem. Phys., 2014, 16, 7290-7298). In...

Abstract At present, non-pillar entry protection in longwall mining is mainly achieved through either the gob-side retaining (GER) procedure or driving (GED) procedure. The GER leads to difficulties maintaining roadway both previous and current panels. A narrow coal pillar about 5–7 m must be left GED procedure; therefore, it causes permanent loss of some coal. pre-backfill (GPD) effectively re...

This paper explores the contribution of systems modeling to the design and analysis of viability in service systems. We apply a modeling framework called SEAM (Systemic Enterprise Architecture Method) to gain an understanding of how a service system maintains its identity and remains viable in its environment. SEAM embodies theoretical insights from systems science and organizational cybernetic...