The distribution of species range size: a stochastic process

The major role played by environmental factors in determining the geographical range sizes of species raises the possibility of describing their long-term dynamics in relatively simple terms, a goal which has hitherto proved elusive. Here we develop a stochastic differential equation to describe the dynamics of the range size of an individual species based on the relationship between abundance and range size, derive a limiting stationary probability model to quantify the stochastic nature of the range size for that species at steady state, and then generalize this model to the species-range size distribution for an assemblage. The model fits well to several empirical datasets of the geographical range sizes of species in taxonomic assemblages, and provides the simplest explanation of species-range size distributions to date

Buckling and vibration of periodic lattice structures

Lattice booms and platforms composed of flexible members or large diameter rings which may be stiffened by cables in order to support membrane-like antennas or reflector surfaces are the main components of some large space structures. The nature of these structures, repetitive geometry with few different members, makes possible relatively simple solutions for buckling and vibration of a certain class of these structures. Each member is represented by a stiffness matrix derived from the exact solution of the beam column equation. This transcendental matrix gives the current member stiffness at any end load or frequency. Using conventional finite element techniques, equilibrium equations can be written involving displacements and rotations of a typical node and its neighbors. The assumptions of a simple trigonometric mode shape is found to satisfy these equations exactly; thus the entire problem is governed by just one 6 x 6 matrix equation involving the amplitude of the displacement and rotation mode shapes. The boundary conditions implied by this solution are simple supported ends for the column type configurations

Chinatown Black Tigers: Black Masculinity and Chinese Heroism in Frank Chin\u27s Gunga Din Highway

Images of ominous villains and asexual heroes in literature and mainstream American culture tend to relegate Asian American men to limited expressions of masculinity. These emasculating images deny Asian American men elements of traditional masculinity, including agency and strength. Many recognize the efforts of Frank Chin, a Chinese American novelist, to confront, expose, and revise such images by relying on a tradition of Chinese heroism. In Gunga Din Highway (1994), however, Chin creates an Asian American masculinity based on elements of both the Chinese heroic tradition and a distinct brand of African American masculinity manifested in the work of Ishmael Reed, an African American novelist and essayist known for his outspoken style.^1 Rather than transforming traditional masculinity to include Asian American manhood, Chin\u27s images of men represent an appropriation of elements from two ethnic sources that Chin uses to underscore those of Asian Americans. While deconstructing the reductive images advocated by the dominant culture, Chin critiques the very black masculinity he adopts. Ultimately he fails to envision modes of masculinity not based on dominance, yet Chin\u27s approach also can be read as the ultimate expression of Asian American individualism

Protecting Parent-Child Relationships: Determining Parental Rights of Same-Sex Parents Consistently Despite Varying Recognition of their Relationship

[Excerpt] “The family and parental relationship appears secure as long as the members of the family stay within the borders of the states that recognize their relationship. What happens, though, when the family ventures beyond the borders of Vermont, Massachusetts, California, and Connecticut, has yet to be determined. Legislation in almost every other state has addressed whether each state will recognize the couples’ relationship,27 but no state has determined how it will treat the legal relationship between the children of these couples and their parents.28 This article will focus on the fragile legal relationship between same-sex parents and their children and will suggest legislative adjustments that can address this relationship without forcing states to recognize the underlying relationship with the parents. […] Part II will explain the most common methods of addressing parentage issues in traditional family relationships. Part III will review the various methods courts have used to address parentage determinations in same-sex relationships in states where same-sex relationships are not sanctioned. Part IV will explain how courts have addressed parentage determinations in the states that recognize some form of same-sex relationship. Part V will identify potential and actual issues that arise when same-sex couples travel from states that recognize their relationship to those that do not. Finally, Part VI will suggest legislative action that can eliminate the need for varying tests and standards depending on the sexes of the parents.

Opaque Selling

We study “opaque” selling in multiproduct environments – a marketing practice in which sellers strategically withhold product information by keeping important characteristics of their products hidden until after purchase. We show that a monopolist will always use opaque selling, but it is not first-best optimal to do so. However, opaque selling might be used at the constrained optimum (with the monopolist’s pricing behavior taken as given). For linear disutility costs, it is optimal for a monopolist to offer a single opaque product

Transfer of preferences on payment

Is the insolvency preference of the Inland Revenue an accessory right and is it tranferred with an assignment of the debt? On what basis is a co-obligant who pays the debt of the other obligants entitled to recover: cession mandate or unjustified enrichment

Financing of large corporations in 1954

Corporations - Finance