Medium-range topological constraints in binary phosphate glasses

2013 ◽  
Vol 138 (24) ◽  
pp. 244507 ◽  
Author(s):  
B. P. Rodrigues ◽  
L. Wondraczek
Keyword(s):  
Phosphate Glasses ◽  
Topological Constraints ◽  
Medium Range

scholarly journals The Structure of Lead-Indium Phosphate Glass

1994 ◽  
Vol 376 ◽  
Author(s):  
K. Suzuya ◽  
D. L. Price ◽  
C.-K. Loong ◽  
B. C. Sales ◽  
L. A. Boatner
Keyword(s):  
Phosphate Glasses ◽  
Index Of Refraction ◽  
Preparation Temperature ◽  
3 Dimensional ◽  
Coordination Numbers ◽  
Dimensional Network ◽  
Medium Range ◽  
A Chain ◽  
Lead Pyrophosphate ◽  
Short Range Structure

ABSTRACTLead-indium phosphate glasses exhibit a number of useful properties such as a high index-of-refraction, low preparation temperature and melt viscosity, and good chemical durability. The structure of such a glass (composition in wt. %: 65 PbO, 29 P2O5, 6 In2O3) has been investigated by total neutron scattering using the GLAD diffractometer at Argonne's spallation neutron source IPNS. Peaks corresponding to the P-O, Pb-O/In-O, and 0-0 pairs were observed in the radial distribution function. The short-range structure in the glass, in terms of average coordination numbers and bond distances, is compared with those of a pure P2O5 glass and with the crystal structure of lead pyrophosphate, Pb2P2O7. Unlike silicate glasses in which the SiO4 tetrahedra form a 3-dimensional network, the PO4 tetrahedra in phosphate glasses form a chain-like structure. The structural modification by the lead cations in phosphate glasses appears to occur mainly in the medium range affecting the lengths and connectivity of the chain-like structure.

Structure and dynamics of phosphate glasses

1998 ◽  
Vol 77 (2) ◽  
pp. 357-362 ◽  
Author(s):  
A. Matic, L. Borjesson
Keyword(s):  
Phosphate Glasses ◽  
Structure And Dynamics

Medium-range Orders in Amorphous Alloys and Their Role on the Plasticity: A Molecular Dynamics Viewpoint Study

2010 ◽  
Vol 48 (2) ◽  
pp. 101-108 ◽  
Author(s):  
Chang-Myeon Lee ◽  
Mirim Lee ◽  
Kwang-Ryeol Lee ◽  
Kyung-Han Kang ◽  
Byeong-Joo Lee ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Amorphous Alloys ◽  
Medium Range

Driver Knowledge and Beliefs About Antilock Brake Systems: Have Preconditions for Behavioral Adaptation Been Met?

2001 ◽  
Vol 1779 (1) ◽  
pp. 62-67 ◽  
Author(s):  
Martin Lee-Gosselin ◽  
Pierre-Sébastien Fournier ◽  
Isabelle Béchard
Keyword(s):  
Behavioral Adaptation ◽  
Standard Equipment ◽  
Telephone Interviews ◽  
Advantages And Disadvantages ◽  
Knowledge And Beliefs ◽  
Behavioral Adaptations ◽  
Open Questions ◽  
Medium Range ◽  
Level Of Knowledge ◽  
Light Duty Vehicles

Some studies suggest that the benefits of antilock brake systems (ABS) may be offset through behavioral adaptation, such as driving faster or following closer. Whether preconditions for behavioral adaptation exist was examined by investigating driver knowledge and beliefs about ABS. Telephone interviews were conducted throughout Quebec early in 1999 with principal drivers of a stratified random sample of 404 drivers with currently registered light-duty vehicles, registered to the same person for at least 18 months. The response rate was 82 percent of 492 reached. Only medium-range and high-end 1990-1995 vehicles, for which ABS was either standard equipment or unavailable, were selected. The protocol involved mostly open questions that encouraged respondents to reveal their knowledge and beliefs with minimal prompting. The results indicated an important lack of understanding, on the part of a majority of drivers, regarding the functioning and use of ABS. This varied from an inability to identify conditions in which ABS is favorable or unfavorable to serious misconceptions; about 25 percent were wrong about whether their vehicle was ABS equipped. Cognitive preconditions for behavioral adaptations—sometimes increased prudence—were found for a minority of this sample, and there may be a relationship between a low level of knowledge and the perceived possibility of driving faster with these brakes. There appears to be a case for improved public and dealer-delivered information on the advantages and disadvantages of ABS in different driving conditions, which if balanced should not increase unsafe behavioral adaptation.

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