Research papers

Physics of chemoreception

Howard C. Berg, Edward M. Purcell

Maximum Likelihood from Incomplete Data Via the EM Algorithm

A. P. Dempster, N. M. Laird, Donald B. Rubin

Summary A broadly applicable algorithm for computing maximum likelihood estimates from incomplete data is presented at various levels of generality. Theory showing the monotone behaviour of the likelihood and convergence of the algorithm is derived. Many examples are sketched, including missing value situations, applications to grouped, censored or truncated data, finite mixture models, variance component estimation, hyperparameter estimation, iteratively reweighted least squares and factor analysis.

Formulation and estimation of stochastic frontier production function models

Dennis J. Aigner, C. A. Knox Lovell, Peter Schmidt

Inequalities in Mechanics and Physics

Georges Duvaut, J. L. Lions, Camille John, Stephen C. Cowin

Studies on the biology of <i>Acanthomia tomentosicollis</i> (Stål) (Hemiptera: Coreidae) in the field and insectary

R. I. Egwuatu, T. Ajibola Taylor

Abstract Studies on the biology of Acanthomia tomentosicollis (Stål) at Ibadan, Nigeria, showed that the periods of development in the field and the insectary averaged 17 and 18 days, respectively. The hemispherical, hexagonally sculptured eggs were laid in batches of 2.99 (mean=7 eggs per batch in the insectary and 20 in the field). Preoviposition periods were 11–22 days in unmated and 6–9 days in mated females. The mean number of eggs deposited by mated females (202) was significantly higher than that deposited by unmated females (135), although the average oviposition period of 16 weeks in unmated females was three weeks longer than in mated females. Unmated males and females were longer-lived than their mated counterparts, and females generally lived longer than males. These results and other observations on 'the biology of A. tomentosicollis are discussed in the context of its seasonal biology and the pattern of infestation of pigeon pea ( Cajanus cajari ), its main host plant.

The Need for a New Medical Model: A Challenge for Biomedicine

George L. Engel

The dominant model of disease today is biomedical, and it leaves no room within tis framework for the social, psychological, and behavioral dimensions of illness. A biopsychosocial model is proposed that provides a blueprint for research, a framework for teaching, and a design for action in the real world of health care.

Self-efficacy: Toward a unifying theory of behavioral change.

Albert Bandura

The present article presents an integrative theoretical framework to explain and to predict psychological changes achieved by different modes of treatment. This theory states that psychological procedures, whatever their form, alter the level and strength of self-efficacy. It is hypothesized that expectations of personal efficacy determine whether coping behavior will be initiated, how much effort will be expended, and how long it will be sustained in the face of obstacles and aversive experiences. Persistence in activities that are subjectively threatening but in fact relatively safe produces, through experiences of mastery, further enhancement of self-efficacy and corresponding reductions in defensive behavior. In the proposed model, expectations of personal efficacy are derived from four principal sources of information: performance accomplishments, vicarious experience, verbal persuasion, and physiological states. The more dependable the experiential sources, the greater are the changes in perceived selfefficacy. A number of factors are identified as influencing the cognitive processing of efficacy information arising from enactive, vicarious, exhortative, and emotive

Population Biology of Plants

John L. Harper

Graduate Texts in Mathematics

Rajendra Bhatia, Glen Bredon, Wolfgang Walter, Joseph Rotman, M. Ram Murty, Jane Gilman, Peter Walters, Martin Golubitsky, I…

A Mathematical Theory of Evidence

Glenn Shafer

Theory of the firm: Managerial behavior, agency costs and ownership structure

Michael C. Jensen, William H. Meckling

A Canonical Transformation for the Sine-Gordon Equation

Yuji Kodama, Miki Wadati

Progress of Theoretical Physics Vol. 56 No. 6 (1976) pp. 1740-1755 Theory of Canonical Transformations for Nonlinear Evolution Equations. I Yuji Kodama and Miki Wadati Progress of Theoretical Physics Vol. 56 No. 6 (1976) pp. 1970-1971 Soliton Creation-Annihilation Operators as the Canonical Transformation Shogo Aoyama and Yuji Kodama

Special points for Brillouin-zone integrations

Hendrik J. Monkhorst, J.D. Pack

A method is given for generating sets of special points in the Brillouin zone which provides an efficient means of integrating periodic functions of the wave vector. The integration can be over the entire Brillouin zone or over specified portions thereof. This method also has applications in spectral and density-of-state calculations. The relationships to the Chadi-Cohen and Gilat-Raubenheimer methods are indicated.

Simple mathematical models with very complicated dynamics

Robert M. May

A Rapid and Sensitive Method for the Quantitation of Microgram Quantities of Protein Utilizing the Principle of Protein-Dye Binding

Mark A. Bradford

A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding

Marion M. Bradford

Biology of Trochammina cf. T. quadriloba Hoeglund (1947), an agglutinating foraminifer

M.B. Salami

Other| April 01, 1976 Biology of Trochammina cf. T. quadriloba Hoeglund (1947), an agglutinating foraminifer M. Babajide Salami M. Babajide Salami Univ. Ife, Dep. Geol., Ile-Ife, Nigeria Search for other works by this author on: GSW Google Scholar Journal of Foraminiferal Research (1976) 6 (2): 142–153. https://doi.org/10.2113/gsjfr.6.2.142 Article history first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation M. Babajide Salami; Biology of Trochammina cf. T. quadriloba Hoeglund (1947), an agglutinating foraminifer. Journal of Foraminiferal Research 1976;; 6 (2): 142–153. doi: https://doi.org/10.2113/gsjfr.6.2.142 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyJournal of Foraminiferal Research Search Advanced Search This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.

Computer science as empirical inquiry

Allen Newell, Herbert A. Simon

Computer science is the study of the phenomena surrounding computers. The founders of this society understood this very well when they called themselves the Association for Computing Machinery. The machine—not just the hardware, but the programmed, living machine—is the organism we study.

The entity-relationship model—toward a unified view of data

Peter Pin-Shan Chen

A data model, called the entity-relationship model, is proposed. This model incorporates some of the important semantic information about the real world. A special diagrammatic technique is introduced as a tool for database design. An example of database design and description using the model and the diagrammatic technique is given. Some implications for data integrity, information retrieval, and data manipulation are discussed. The entity-relationship model can be used as a basis for unification of different views of data: the network model, the relational model, and the entity set model. Semantic ambiguities in these models are analyzed. Possible ways to derive their views of data from the entity-relationship model are presented.

The Dynamic Renormalization-Group Theory above a Nematic-Smectic A Transition

Yuh Shiwa

Progress of Theoretical Physics Vol. 58 No. 1 (1977) pp. 77-91 The Mode-Coupling Theory for the Nematic Mesophase near the Clearing Point Yasuhiro Shiwa

Solvable Model of a Spin-Glass

David C. Sherrington, Scott Kirkpatrick

We consider an Ising model in which the spins are coupled by infinite-ranged random interactions independently distributed with a Gaussian probability density. Both "spinglass" and ferromagnetic phases occur. The competition between the phases and the type of order present in each are studied.

“Mini-mental state”

Marshal F. Folstein, Susan E. Folstein, Paul R. McHugh

A vector space model for automatic indexing

Gerard Salton, Anita M.-Y. Wong, Chul‐Su Yang

In a document retrieval, or other pattern matching environment where stored entities (documents) are compared with each other or with incoming patterns (search requests), it appears that the best indexing (property) space is one where each entity lies as far away from the others as possible; in these circumstances the value of an indexing system may be expressible as a function of the density of the object space; in particular, retrieval performance may correlate inversely with space density. An approach based on space density computations is used to choose an optimum indexing vocabulary for a collection of documents. Typical evaluation results are shown, demonstating the usefulness of the model.

The mathematics of diffusion

Gaeun Park