Cutting obstacle

Single-line sources are now available which cut down the number of resonance lines in a spectrum and thereby reduce the resolution problems considerably. Since many laboratories have access to electron and ion accelerators to produce the parent nuclides Co and Cu, the major experimental obstacles to Ni spectroscopy have been overcome and a good deal of successful work has been performed in recent years. Moreover, the development of synchrotron radiation instead of conventional Mossbauer sources is of additional advantage for future Mossbauer applications (see below). 

Building stone (dimension stone) is usually cut from the quarry face by means of a wire saw. Explosives are used only for clearing overburden or to remove obstacles. The process of quarrying is analogous to obtaining coal from opencast sites where the coal is at or near the surface of the ground. Under wet conditions,... 

Staffordshire remained poor up to the eighteenth century, despite its rich stores of mineral wealth, notably iron and coal. The lack of communication between this county and the rest of England was an obstacle to industrial and commercial development of Staffordshire. It was shut in on the north by tracts of moorland and limestone hills, with the wooded Cannock Chase on the south, and the Welsh mountains as a barrier in the western direction. The Trent, the main river in Staffordshire, rises in the north of the county, but only from the neighborhood of Burton-upon-Trent, on the eastern boundary of the county, was river navigation of any consequence. There was no way of reaching the western seaboard by water until the cutting of canals in the eighteenth century. 

Bangalore torpedoes are simple metal pipes or tubes a few centimetres in diameter and one or two metres in length. They are packed with high explosives and slipped into barbed wire fencing or wire obstacles to cut a path a few metres wide, or laid on the ground to detonate buried mines. 

First, failure to advance a stylet can be due to damage or fracture of the coil or to turns in the course of the lead. If advancement stops in the proximal tract of the lead, the operator must check to see whether the obstacle can be overcome by cutting the lead and advancing the stylet along the undamaged portion. In some ways, obstacles can be removed when the course of the lead is modified by the effects of dilatation, and subsequent... 

Wallace realized immediately after arrival on the Isthmus that the harsh terrain and the climate conditions were a serious obstacle to his project. The task ahead of him seemed almost impossible, to dig a canal 80 km long and 10 m below sea level stretching from the Atlantic to the Pacific Ocean. He would have to cut through dense jungle, control parts of the Chagres River, and haul away sections of the Culebra Mountain. Wallace asked for additional time to survey the area, but Roosevelt s directive to Make the dirt fly prevented any further delay. 

The main obstacle to the widespread use of microfiuidics in conjunction with MS is related to the fabrication of such systems. It still requires a considerable effort and costly equipment. Implementation of microchips often necessitates expert knowledge about the device assembly, maintenance, and trouble-shooting. However, the rapidly expanding 3D printing tools, and open-source electronic modules, can cut the costs of fabrication and promote the use of microfiuidic devices in kinetic studies conducted with MS detectors. We anticipate that, in the near future, a microscale total analysis system (pTAS) combining microfiuidics and miniature mass spectrometers will become an omnipresent piece of the laboratory toolkit. 

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