Microstructure Controlled Shear Band Pattern Formation and Enhanced Plasticity of Bulk Metallic Glasses Containing in situ Formed Ductile Phase Dendrite Dispersions

Results are presented for a ductile metal reinforced bulk metallic glass matrix composite based on glass forming compositions in the Zr-Ti-Cu-Ni-Be system. Primary dendrite growth and solute partitioning in the molten state yields a microstructure consisting of a ductile crystalline Ti-Zr-Nb β phase, with bcc structure, in a Zr-Ti-Nb-Cu-Ni-Be bulk metallic glass matrix. Under unconstrained mechanical loading organized shear band patterns develop throughout the sample. This results in a dramatic increase in the plastic strain to failure, impact resistance, and toughness of the metallic glass

Worldwide Advances in Seismic Zonation

Seismic zonation is the process that integrates the hazard, policy, and built environments to produce maps that divide a geographic region into smaller areas or zones which can be used by community decision makers to answer the question, Where is the best location to locate and build a specific structure. Seismic zonation maps have been produced by almost every country in the world with the most rapid advances occurring after 1968

Large supercooled liquid region and phase separation in the Zr–Ti–Ni–Cu–Be bulk metallic glasses

Results of calorimetric, differential thermal analysis, and structural measurements are presented for a series of bulk metallic glass forming compositions in the Zr-Ti-Cu-Ni-Be alloy system. The calorimetric data for five alloys, prepared along the tie line between phase separating and nonphase separating compositions, show that the transition from phase separating to nonphase separating behavior is smooth. The bulk glasses near the center of the tie line exhibit large supercooled liquid regions: Delta T approximate to 135 K, the largest known for a bulk metallic glass

Sessile droplet evaporation on superheated superhydrophobic surfaces

This fluid dynamics video depicts the evaporation of sessile water droplets placed on heated superhydrophobic (SH) surfaces of varying cavity fraction, F_c, and surface temperature, T_s, above the saturation temperature, T_sat. Images were captured at 10,000 FPS and are played back at 30 FPS in this video. Teflon-coated silicon surfaces of F_c = 0, 0.5, 0.8, and 0.95 were used for these experiments. T_s ranging from 110{\deg}C to 210{\deg}C were studied. The video clips show how the boiling behavior of sessile droplets is altered with changes in surface microstructure. Quantitative results from heat transfer rate experiments conducted by the authors are briefly discussed near the end of the video.Comment: videos include

LPS/11 Users Manual

A package of programs for solving small linear programming (LP) problems on a PDP-11 computer is described. The package consists of eight executable programs, equivalent to corresponding procedures in an MPS, and includes both the primal and dual algorithms and two parametric algorithms. The programs are written entirely in FORTRAN IV (the PDP dialect) and are designed for all in-core operation during solution of the model case. The size of models is arbitrarily limited to 100 rows and 250 columns to make this mode of operation possible on a relatively small computer. The eight programs are quite similar to the corresponding procedures in large MPSs, both in construction and operation, and give essentially identical results. Output formats are also very similar to those of standard MPSs. It is possible to modify the programs for larger models and to transfer them to other computers but certain internal changes will be required. Some of these considerations are discussed in the final section

On Complaints About Applying Models Effectively

There is a growing dissatisfaction in many quarters with the use of mathematical modeling, and skepticism about its effectiveness, particularly with large-scale models. In the past two to three months alone, this has been brought to my attention in at least six instances, some forcefully. I believe this is an extremely serious matter. Despite impressive prestige and far-ranging efforts in an almost unbelievable number of places, systems analysis is never its own sponsor. During the past quarter century, an impressive array of theories, techniques, methods and know-how has been created and effective use of this technology is now sorely needed in meeting extremely serious problems. However, no funded activity can long survive and prosper if it is not perceived as contributing something meaningful to society. In short, our time has come but we had better be able to deliver because, otherwise, we are merely an expensive frill. Admittedly, the effectiveness of modeling is not entirely in the hands of technical specialists an issue to which IIASA is devoting much attention. However, it is useful to be aware of how our efforts are viewed by others who do sponsor projects in the field and some of the misgivings and complaints which they express

Testing milk and cream

Caption title.Digitized 2006 AES MoU

User-Oriented Network: Part IV. A Suggested Set of Network Commands

In the discussions in Parts II and III (IIASA WP-75-82 and WP-75-83), several commands and their mnemonics were invented. This was done as occasion required without any overall description of style or extent. Before proceeding with further discussions of possible network facilities and features, it seems appropriate to define a more comprehensive set of commands in a consistent manner