InGaAsP grown by He plasma assisted Molecular Beam Epitaxy has a 15 ps carrier lifetime and a sharp band edge allowing for an ultrafast response and a strong optical nonlinearity at the telecommunications wavelength of 1.55 μm. S.D. Benjamin, Li Qian, J.E. Ehrlich, P.W.E. Smith, B.J. Robinson, D.A. Thompson Picosecond carrier lifetime in InGaAsP... 1 Picosecond Carrier Lifetime in InGaAsP Grown...

The concrete always contains microstructures like micro-crack, voids, etc. These parameters affected the lifetime of materials. This article presents a computation algorithm to predict brittle materials which depends on distribution micro-crack in proposed model is based subcritical crack growth using linear elastic fracture mechanics (LEFM) approach. considers both tensile and shear fracturing...

The Bi-2223 phase growth was studied on the view growth Kinetics and described by using suggested kinetic equations, and the kinetics parameters of the 2223 growth were experimentally determined. The precursor particle size effect on Bi-2223 phase growth was studied, as well. Precursors in this experiment were made by four different techniques with different particle sizes, and samples were sin...

Actively generated mechanical forces play a central role in axon growth and guidance, but the mechanisms that underly force generation and regulation in growing axons remain poorly understood. We report measurements of the dynamics of traction stresses from growth cones of actively advancing axons from postnatal rat DRG neurons. By tracking the movement of the growth cone and analyzing the trac...

In the toad Bufo calamita, among-population variation of size follows roughly a converse Bergmann cline, but populations exist that do not fit this pattern. We propose that latitudinal body size variation is a byproduct of adaptive covariation among the life-history traits juvenile growth rate, longevity and lifetime fecundity. We choose five populations (two in Andalusia, two in Catalonia and ...

As the trend in requirements of electronic packaging is toward higher I/O, greater performance, higher density, and lighter weight, the use of area array packaging technology is expected to increase. The type of packaging, such as ball grid array (BGA), chip scale package (CSP), and Flip Chip, provides the ultimate in high I/O-density and count with superior electrical performance, and very sma...

We propose a new class of cluster growth models where growth sites have a finite lifetime ~, which contains as special cases the Eden model (r = oo) and the kinetic growth walk (~ = 1). For finite but large ~ values the growth process can be characterized by a crossover time tx; for times below t x an Eden-type cluster is formed, while for times above tx the growth process belongs to the univer...

abstract: the lifetime of a cutting tool is an important and determinant parameter for evaluating its performance. the amount of tool abrasion affects seriously dimensions and surface quality of the working piece so that one of the main factors to determine the lifetime of a tool is the level of its wearing. for this purpose, an abrasion standard is defined for each particular tool above which ...

In this research, the lifetime of green organic light emitting diodes (OLEDs) is studied using four passivation layers. To encapsulate the OLEDs, MgF2, YF3, composed of alternating MgF2/ZnS and YF3/ZnS layers were grown by thermal vacuum deposition. Measurements show that the device lifetime is significantly improved by using YF3 and ZnS as passivation layers. However, diodes encapsulated by Mg...