Increasing Temperature and Flow Management Alter Mercury Dynamics in East Fork Poplar Creek

2021 ◽  
Author(s):  
Scott C. Brooks ◽  
Carrie L. Miller ◽  
Ami L. Riscassi ◽  
Kenneth A. Lowe ◽  
Johnbull O. Dickson ◽  
...  
Keyword(s):  
Flow Management ◽  
East Fork Poplar Creek ◽  
Increasing Temperature

Theoretical study of the prestressing strand's stress by computer modeling methods

2020 ◽  
Vol 76 (11) ◽  
pp. 1139-1148
Author(s):  
A. G. Korchunov ◽  
E. M. Medvedeva ◽  
E. M. Golubchik
Keyword(s):  
Residual Stresses ◽  
High Strength ◽  
Pearlitic Steel ◽  
Internal Stresses ◽  
Steel Microstructure ◽  
Compressive Stresses ◽  
Wide Range ◽  
Prestressing Strands ◽  
Increasing Temperature ◽  
Wire Strand

The modern construction industry widely uses reinforced concrete structures, where high-strength prestressing strands are used. Key parameters determining strength and relaxation resistance are a steel microstructure and internal stresses. The aim of the work was a computer research of a stage-by-stage formation of internal stresses during production of prestressing strands of structure 1х7(1+6), 12.5 mm diameter, 1770 MPa strength grade, made of pearlitic steel, as well as study of various modes of mechanical and thermal treatment (MTT) influence on their distribution. To study the effect of every strand manufacturing operation on internal stresses of its wires, the authors developed three models: stranding and reducing a 7-wire strand; straightening of a laid strand, stranding and MTT of a 7-wire strand. It was shown that absolute values of residual stresses and their distribution in a wire used for strands of a specified structure significantly influence performance properties of strands. The use of MTT makes it possible to control in a wide range a redistribution of residual stresses in steel resulting from drawing and strand laying processes. It was established that during drawing of up to 80% degree, compressive stresses of 1100-1200 MPa degree are generated in the central layers of wire. The residual stresses on the wire surface accounted for 450-500 MPa and were tension in nature. The tension within a range of 70 kN to 82 kN combined with a temperature range of 360-380°С contributes to a two-fold decrease in residual stresses both in the central and surface layers of wire. When increasing temperature up to 400°С and maintaining the tension, it is possible to achieve maximum balance of residual stresses. Stranding stresses, whose high values entail failure of lay length and geometry of the studied strand may be fully eliminated only at tension of 82 kN and temperature of 400°С. Otherwise, stranding stresses result in opening of strands.

Low Reynolds number flow around and heat transfer from a heated circular cylinder

2010 ◽  
Vol 1 (1-2) ◽  
pp. 15-20 ◽  
Author(s):  
B. Bolló
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
Lift Coefficient ◽  
Reynolds Numbers ◽  
Low Reynolds Numbers ◽  
Reynolds Number Flow ◽  
Two Dimensional Flow ◽  
Number Flow ◽  
Low Reynolds ◽  
Increasing Temperature

Abstract The two-dimensional flow around a stationary heated circular cylinder at low Reynolds numbers of 50 < Re < 210 is investigated numerically using the FLUENT commercial software package. The dimensionless vortex shedding frequency (St) reduces with increasing temperature at a given Reynolds number. The effective temperature concept was used and St-Re data were successfully transformed to the St-Reeff curve. Comparisons include root-mean-square values of the lift coefficient and Nusselt number. The results agree well with available data in the literature.

LATE AND NON-PAYMENTS ISSUES IN THE MALAYSIAN CONSTRUCTION INDUSTRY: PERSPECTIVE OF BUILDING MATERIAL SUPPLIERS

2020 ◽  
Vol 6 (1) ◽  
pp. 39
Author(s):  
Mohd Fisal Ishak ◽  
Kartina Alauddin ◽  
Mohd Shahrol Hafiz Ibrahim
Keyword(s):  
Construction Industry ◽  
Cash Flow ◽  
Financial Management ◽  
Building Material ◽  
Building Materials ◽  
Management Team ◽  
Flow Management ◽  
Cash Flow Management ◽  
Main Effect ◽  
Klang Valley

Payment in the Malaysian construction industry has generally been an issue of concern. Late and non-payment problem is endemic in construction and needs to be addressed. The aim of this study is to investigate the issues related to late and non-payment based on the building materials suppliers’ perspective. Questionnaires were distributed to suppliers of building materials in the Klang Valley. Findings from the study shows the main cause of late and non-payment is the paymaster’s poor financial management while the main effect of late and non-payment is problem with the cash flow.  The most recommended possible solution to cope with the issue is for the paymaster to conduct training on financial and cash flow management to the management team in the company.  

Flow Management in Transition

1996 ◽  
Vol 4 (4) ◽  
pp. 225-227 ◽  
Author(s):  
Amedeo R. Odoni
Keyword(s):  
Flow Management

Traffic Flow Management Impact on Delay and Fuel Consumption: an Atlanta Case Study

2012 ◽  
Vol 20 (3) ◽  
pp. 203-224 ◽  
Author(s):  
Shon R. Grabbe ◽  
Banavar Sridhar ◽  
Avijit Mukherjee ◽  
Alexander Morando
Keyword(s):  
Fuel Consumption ◽  
Traffic Flow ◽  
Flow Management ◽  
Traffic Flow Management
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