l. The mechanical behaviour of crab shell is similar to that of prawn solid cuticle, especially in the occurrence of a low strain discontinuity in their bulk tensile stress-strain curves. 2. Although isolated crab chitin breaks in tension by the progressive failure of individual lamellae and exhibits post-fracture delamination, whole crab cuticle fails in an entirely brittle manner. 3. The mech...

Many elementary school teachers realize that more and more hands-on activities is not the solution to unsatisfactory science literacy. The process-product debate of the 1960s reform in which alphabet science programs exclusively promoted hands-on concrete discovery activities was not successful for about 75% of elementary school teachers. The uncertainty of unstructured explorations, the discou...

'Modern mathematics education relies heavily upon the.cognitive 4 theories of Jean Piaget and Jerome Bruner. These theories"provide the bais for explanations of levels of development as well as direction for instructional procedures. Research relayed to cognitive abilites in learning disabled adolescents, specificallyin mathematics, are virtually,nonexistent. The preSent investigation sought to...

In recent years, the Lamb wave analysis by the multi-channel analysis of surface waves (MASW) for concrete structures has been an effective nondestructive evaluation, such as the condition assessment and dimension identification by the elastic wave velocities and their reflections from boundaries. This study proposes an effective Lamb wave analysis by the practical application of MASW to concre...

We analyze the concrete security provided by a signature scheme described in a recent Internet Draft by McGrew and Curcio.

The saccule is known to play an important role in hearing in fishes. In this study we investigated spatial frequency selectivity of single saccular afferents in a teleost fish (the sleeper goby, Dormitator latifrons) to acoustic particle motion at 50-400 Hz. Saccular afferents have similar distributions of best sensitivity (-90.0 to -54.8 dB re. 1 g, mean +/- s.d.=-81.1+/-8.0 dB) and characteri...

An analysis of group influence processes indicates that the functional relationship between attraction to a group and influence exerted by the group depends on the importance to the individual member of any freedom that is threatened by group pressure to conform. This proposition was tested by an experiment in which the effect of group conformity pressure on public and private opinions was meas...

This is Part II of a two part paper dealing with the current state of knowledge of the fire-safe structural design and construction of unbonded post-tensioned (UPT) flat plate concrete structures. Part I provided detailed results of nineteen transient high temperature stress relaxation tests on restrained UPT tendons of realistic length and parabolic longitudinal profiles. Experimentation ident...

A computational model is presented for determining deformations in complexly stressed beams of a structurally non-linear reinforced concrete frame transcendental state caused by special emergency action the form sudden removal one structural elements. The determination stress-strain after formation spatial cracks elements was carried out using calculated section. At same time, dynamic additiona...

The aim of the study is to select rational axle loads rolling stock and establish conditions for their circulation on railways Republic Uzbekistan. In this work, research has been carried out assess indicators stress-strain state rail track elements from action with various axial loads. dynamic wheel rail, tensile stresses at edges foot, in wooden sleepers (rubber under-rail pads reinforced con...