The concept and methodology for interactive design of Methods of Statement based on the use of technical and informational models, technological charts, and 3D models of construction facilities is suggested. The article presents the peculiarities and principles for the speed-up assembling (erection, disassembling) of unified modular structures, prefabricated block sections, their transportation and rapidly erected modular buildings. The high speed of construction is reached due to the qualitative interactive Method of Statement, logistics of sequence and completeness of information, use of BIM technologies, unconditional use of permanent quality control of works execution at all construction stages with the automatic control of accuracy as to positioning of construction structures and execution of construction and technological operations.
The principles of high-speed pre-fabricated industrial construction in the conditions of Northern regions are as follows. There are several types of methods for using industrial unified structures pre-fabricated at the factory in the form of light-weight multi-layer sandwich panels and aggregated block-modules. They are: complex mechanization of assembly processes, transportation and sequenced-flow organization of assembly on the basis of supplying aggregated sandwich panels. Key importance belongs to the following: adaptability of project solutions to streamlined production, accuracy of assembly and regular pace of assembly operations in the construction site by means of transportable small-size equipment.
Recent experiments on atom loss in ultra-cold Fermi gases all show a maximum at a magnetic field below Feshbach resonance, where the s-wave scattering length is large (comparable to inter-particle distance) and positive. These experiments have been performed over a wide range of conditions, with temperatures and trap depths spanning three decades. Different groups have come up with different explanations, including the emergence of Stoner ferromagnetism. Here, we show that this maximum is a consequence of two major steps. The first is the establishment of a population of shallow dimers, which is the combined effect of dimer formation through three-body recombination, and the dissociation of shallow dimers back to atoms through collisions. The dissociation process will be temperature dependent and is affected by Pauli blocking at low temperatures. The second is the relaxation of shallow dimers into tightly bound dimers through atom-dimer and dimer-dimer collisions. In these collisions, a significant amount of energy is released. The reaction products leave the trap, leading to trap loss. We have constructed a simple set of rate equations describing these processes. Remarkably, even with only a few parameters, these equations reproduce the loss rate observed in all recent experiments, despite their widely different experimental conditions. Our studies show that the location of the maximum loss rate depends crucially on experimental parameters such as trap depth and temperature. These extrinsic characters show that this maximum is not a reliable probe of the nature of the underlying quantum states. The physics of our equations also explains some general trends found in current experiments.
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