CALENDAR-NETWORK PLANNING OF CONSTRUCTION OF LINEAR OBJECTS IN THE MEDIUM OF MS PROJECT

The article reveals the features of the organizational and technological design of linearextended objects in the context of modern development of information modeling technologies for highways (IMD). The method of automated construction of calendar-network schedules of construction of highways in the MS Project environment is proposed, taking into account the spatial decomposition of a linearly extended object into homogeneous areas. The principles of hierarchical structuring of types of work and technological processes are indicated. An example of a transition from a linear graph and a Gantt chart constructed in the MS Project to network models using the critical path method is given, taking into account the options for stretching frontal and resource links between the work. The conditions for simulation modeling in the MS Project environment for identifying the risks of production and operational management of construction . The approach outlined in the article reveals additional possibilities for designing the organization of construction of linear objects aimed at improving the effectiveness of methods of information modeling in construction

Reasoning of group constructive solutions of a roadbed on automobile roads’ areas in the conditions of cryolithic zone

The authors propose a method for solving the problem of belonging group constructive solutions of a roadbed to areas with repetitive, along a route, engineering and geological conditions in design of roads on permafrost grounds. There is developed an algorithm of selecting effective options based on combinatorial method on criterion of minimizing total discounted costs for construction, major repair, repair and maintenance of a road construction during life cycle. The result of problem solution is structuring of an object, which serves as the basis for the organizational and technological design

Z-pinch plasma lens focusing of a heavy-ion beam

For the first time a heavy-ion beam was focused using a z-pinch plasma lens. The diameter of an incident, parallel, 460-MeV argon-ion beam was reduced from 8 mm (FWHM) to 2 mm within 230 mm downstream of the plasma. Inside a cylindrically symmetric plasma column a high-gradient, azimuthal magnetic field is produced during a z-pinch discharge. For axially moving, high-energy charged particles this field configuration provides strong, first-order focusing simultaneously in both transversal planes. The measured spot size agrees with numerical calculations taking into account the finite beam emittance, and charge exchange as well as energy-loss processes contributing to aberrations

Measurement of stopping power of 240 MeV argon ions in partially ionized helium discharge plasma

An energy loss of 240 MeV argon ions in a Z-pinch helium plasma has been for the first time observed throughout the entire pinching process. Standard Stark broadening analysis gives an electron density ranging from 4 to 6 × 1017 cm−3 during the pinch. To deduce stopping power from the energy loss, the target thickness of the helium plasma has been evaluated assuming the mean charge of helium based on thermal equilibrium. The observed electron density and the mean charge of helium give a target thickness of 30 ± 3 μg cm−2 from 1 μs to 1.8 μs after the discharge ignition. The measured stopping power exceeds a tabulated value for cold helium gas by a factor of 2 to 3 around the time of the first pinch. The experimental stopping power is compared with theoretical values calculated using an equation of stopping power for a partially ionized plasma.</jats:p