Bronx Community College

About: Bronx Community College is a education organization based out in The Bronx, New York, United States. It is known for research contribution in the topics: Higher education & Quantum group. The organization has 209 authors who have published 288 publications receiving 4582 citations. The organization is also known as: BCC & Bronx CC.

Fractal character of fracture surfaces of metals

Abstract: When a piece of metal is fractured either by tensile or impact loading (pulling or hitting), the fracture surface that is formed is rough and irregular. Its shape is affected by the metal's microstructure (such as grains, inclusions and precipitates, whose characteristic length is large relative to the atomic scale), as well as by ‘macrostructural’ influences (such as the size, the shape of the specimen, and the notch from which the fracture begins). However, repeated observation at various magnifications also reveals a variety of additional structures that fall between the ‘micro’ and the ‘macro’ and have not yet been described satisfactorily in a systematic manner. The experiments reported here reveal the existence of broad and clearly distinct zone of intermediate scales in which the structure is modelled very well by a fractal surface. A new method, slit island analysis, is introduced to estimate the basic quantity called the fractal dimension, D. The estimate is shown to agree with the value obtained by fracture profile analysis, a spectral method. Finally, D is shown to be a measure of toughness in metals.

A Generalization of

Abstract: (1989). A Generalization of . The College Mathematics Journal: Vol. 20, No. 5, pp. 416-418.

Computational efficiency achieved by time splitting of finite difference operators.

Abstract: A technique is presented for computing multidimensional time-dependent flow fields that avoids much of the inefficiency typically found in finite difference calculations. The technique initially divides the flow field into regions, each containing a mesh of general quadrilateral cells chosen to provide spatial resolution of the local features of the flow. A finite difference operator of second order accuracy, consisting of a sequence of one-dimensional operators (each operating at near maximum Courant-Friedrich-Lewy number) is then constructed for each region. Numerical results illustrating the technique for inviscid flows about simple bodies that generate shock waves, embedded shock waves, and expansion fans are presented and compared with exact theory.

Race and Racism in the Experiences of Black Male Resident Assistants at Predominantly White Universities

Abstract: Recent research has shown a nexus between active out-of-class engagement and the accrual of unique race/gender-specific educational outcomes among Black male undergraduates. Yet, rarely explored are the racialized experiences of those who become actively engaged and assume leadership positions on campuses where racial diversity is low, hence the purpose of this study. Focus group interviews were conducted with 52 Black male Resident Assistants (RAs) at six large, predominantly White universities. Racist stereotypes and racial microaggressions, the complexities associated with “onlyness” in the RA position, and heightened scrutiny from White supervisors are among the findings reported in this article. Also offered are implications for addressing racial toxins that dissuade Black male student leadership in residence halls and other out-of-class engagement venues.